Device, method, and user interface for voice-activated navigation and browsing of a document

[0001] This application claims priority to U.S. Provisional Patent Application Ser. No. 61/666,659, filed Jun. 29, 2012, entitled “Device, Method, and User Interface for Voice-Activated Navigation and Browsing of a Document,” which is incorporated by reference herein in its entirety.

[0002] The disclosed embodiments relate generally to digital assistant systems, and more specifically, digital assistant systems that perform voice-activated navigation and browsing of documents.

[0003] Just like human personal assistants, digital assistant systems can perform requested tasks and provide requested advice, information, or services. A digital assistant system's ability to fulfill a user's request is dependent on the digital assistant system's correct comprehension of the request or instructions. Recent advances in natural language processing have enabled users to interact with digital assistant systems using natural language, in spoken or textual forms. Such digital assistant systems can interpret the user's input to deduce the user's intent, translate the deduced intent into actionable tasks and parameters, execute operations or deploy services to perform the tasks, and produce output that is intelligible to the user.

[0004] Such digital assistant systems may be configured to assist users who have limited accessibility to interact with electronic devices. For example, people with impaired vision, such as low-vision users and blind users, dyslexic users or others with learning disabilities, or even sighted users who simply want or need to use a device without looking at the device during operation can benefit from digital assistant systems that read information to users. In another example, for electronic devices with touch screens, people with limited motor skills, such as those with certain finger or hand impairments, may find performing touch gestures on the touch screens difficult, if not impossible. However, digital assistant systems may receive voice commands, thereby eliminating the need for touch gestures.

[0005] However, navigation and browsing of documents remain cumbersome and inefficient, thereby creating a significant cognitive burden on a user with impaired vision and/or limited motor skills.

[0006] As described above, there is a need for digital assistant systems to provide an improved user interface for navigation and browsing of documents to users with impaired vision and/or limited motor skills. This enables users to efficiently navigate through and browse documents.

[0007] The embodiments disclosed herein provide methods, systems, and computer readable storage media that provide voice-activated navigation and browsing of a document.

[0008] Some embodiments provide a method for navigating through documents performed at an electronic device with one or more processors and memory. This method includes receiving a first document comprising a plurality of links, outputting a voice reading of at least a portion of the first document, outputting audible information identifying a link of the plurality of links, and, in response to outputting the audible information identifying the link, receiving from the user a voice command of a first type regarding the link. The method also includes, in response to receiving from the user the voice command, outputting a voice reading of at least a portion of a second document associated with the link.

[0009] In accordance with some embodiments, a method for browsing a document performed at an electronic device with one or more processors and memory includes receiving a document having a plurality of portions, where at least some of the portions are associated with respective metadata. The method also includes outputting a voice reading of respective portions of the document, including audibly distinguishing the respective portions based on the respective metadata. The method further includes receiving from a user a voice command requesting navigation to a particular portion associated with particular metadata; and, in response to receiving the voice command, outputting a voice reading of the particular portion associated with the particular metadata.

[0010] In accordance with some embodiments, a method for identifying a set of documents performed at an electronic device with one or more processors and memory includes outputting a voice reading of at least a portion of a document of a plurality of documents. The method also includes, while outputting the voice reading, receiving from a user a voice command requesting a document corresponding to a particular criteria. The method further includes, in response to receiving from the user the voice command, identifying one or more documents, of the plurality of documents, that correspond to the particular criteria, and outputting a voice reading of at least a portion of a respective document of the one or more identified documents.

[0011] In accordance with some embodiments, an electronic device includes one or more processors and memory storing one or more programs for execution by the one or more processors. The one or more programs include instructions for performing the operations of any of the methods described above. In accordance with some embodiments, a graphical user interface on an electronic device with a display, memory, and one or more processors to execute one or more programs stored in the memory includes one or more of the elements displayed in any of the methods described above, which are updated in response to inputs, as described in any of the methods above. In accordance with some embodiments, a computer readable storage medium has stored therein instructions, which, when executed by an electronic device with one or more processors and memory, cause the device to perform the operations of any of the methods described above. In accordance with some embodiments, an electronic device includes means for performing the operations of any of the methods described above. In accordance with some embodiments, an information processing apparatus, for use in an electronic device includes means for performing the operations of any of the methods described above. In accordance with some embodiments, an electronic device includes a processing unit configured to perform the operations of any of the methods described above.

[0012] In accordance with some embodiments, an electronic device includes an audio input unit configured to receive audio inputs. The electronic device also includes an audio output unit configured to output audible information. The electronic device includes a processing unit coupled to the audio input unit and the audio output unit. The processing unit is configured to receive a first document comprising a plurality of links. The processing unit is configured to output a voice reading of at least a portion of the first document. The processing unit is configured to output audible information identifying a link of the plurality of link. The processing unit is configured to, in response to outputting the audible information identifying the link, receive from the user a voice command regarding the link. The processing unit is configured to, in response to receiving from the user the voice command, output a voice reading of at least a portion of a second document associated with the link.

[0013] In accordance with some embodiments, an electronic device includes an audio input unit configured to receive audio inputs. The electronic device also includes an audio output unit configured to output audible information. The electronic device includes a processing unit coupled to the audio input unit and the audio output unit. The processing unit is configured to receive the document having a plurality of portions, wherein at least some of the portions are associated with respective metadata. The processing unit is configured to output a voice reading of respective portions of the document, including audibly distinguishing the respective portions based on the respective metadata. The processing unit is configured to receive from a user a voice command requesting navigation to a particular portion associated with particular metadata. The processing unit is configured to, in response to receiving the voice command, output a voice reading of the particular portion associated with the particular metadata.

[0014] In accordance with some embodiments, an electronic device includes an audio input unit configured to receive audio inputs. The electronic device also includes an audio output unit configured to output audible information. The electronic device includes a processing unit coupled to the audio input unit and the audio output unit. The processing unit is configured to output a voice reading of at least a portion of a document of a plurality of documents. The processing unit is configured to, while outputting the voice reading, receive from a user a voice command requesting a document corresponding to a particular criteria. The processing unit is configured to, in response to receiving from the user the voice command, identify one or more documents, of the plurality of documents, that correspond to the particular criteria; and output a voice reading of at least a portion of a respective document of the one or more identified documents.

[0015] Thus, digital assistant systems are provided with new and improved methods that enable navigation and browsing of documents, thereby improving the user interfaces for users with limited accessibility. Such methods and systems may complement or replace existing methods and systems.

[0026] Like reference numerals refer to corresponding parts throughout the drawings.

[0027] FIG. 1 is a block diagram of an operating environment 100 of a digital assistant according to some embodiments. The terms “digital assistant,” “virtual assistant,” “intelligent automated assistant,” or “automatic digital assistant,” refer to any information processing system that interprets natural language input in spoken and/or textual form to deduce user intent (e.g., identify a task type that corresponds to the natural language input), and performs actions based on the deduced user intent (e.g., perform a task corresponding to the identified task type). For example, to act on a deduced user intent, the system can perform one or more of the following: identifying a task flow with steps and parameters designed to accomplish the deduced user intent (e.g., identifying a task type), inputting specific requirements from the deduced user intent into the task flow, executing the task flow by invoking programs, methods, services, APIs, or the like (e.g., sending a request to a service provider); and generating output responses to the user in an audible (e.g., speech) and/or visual form.

[0028] Specifically, a digital assistant system is capable of accepting a user request at least partially in the form of a natural language command, request, statement, narrative, and/or inquiry. Typically, the user request seeks either an informational answer or performance of a task by the digital assistant system. A satisfactory response to the user request is generally either provision of the requested informational answer, performance of the requested task, or a combination of the two. For example, a user may ask the digital assistant system a question, such as “Where am I right now?” Based on the user's current location, the digital assistant may answer, “You are in Central Park near the west gate.” The user may also request the performance of a task, for example, by stating “Please invite my friends to my girlfriend's birthday party next week.” In response, the digital assistant may acknowledge the request by generating a voice output, “Yes, right away,” and then send a suitable calendar invite from the user's email address to each of the user' friends listed in the user's electronic address book. There are numerous other ways of interacting with a digital assistant to request information or performance of various tasks. In addition to providing verbal responses and taking programmed actions, the digital assistant can also provide responses in other visual or audio forms (e.g., as text, alerts, music, videos, animations, etc.).

[0029] As shown in FIG. 1, in some embodiments, a digital assistant system is implemented according to a client-server model. The digital assistant system includes a client-side portion (e.g., 102a and 102b) (hereafter “digital assistant (DA) client 102”) executed on a user device (e.g., 104a and 104b), and a server-side portion 106 (hereafter “digital assistant (DA) server 106”) executed on a server system 108. The DA client 102 communicates with the DA server 106 through one or more networks 110. The DA client 102 provides client-side functionalities such as user-facing input and output processing and communications with the DA server 106. The DA server 106 provides server-side functionalities for any number of DA clients 102 each residing on a respective user device 104 (also called a client device).

[0030] In some embodiments, the DA server 106 includes a client-facing I/O interface 112, one or more processing modules 114, data and models 116, and an I/O interface to external services 118. The client-facing I/O interface facilitates the client-facing input and output processing for the digital assistant server 106. The one or more processing modules 114 utilize the data and models 116 to determine the user's intent based on natural language input and perform task execution based on the deduced user intent.

[0031] In some embodiments, the DA server 106 communicates with external services (e.g., navigation service(s), messaging service(s), information service(s), calendar service, telephony service, etc.) through the network(s) 110 for task completion or information acquisition. The I/O interface to the external services 118 facilitates such communications.

[0032] Examples of the user device 104 include, but are not limited to, a handheld computer, a personal digital assistant (PDA), a tablet computer, a laptop computer, a desktop computer, a cellular telephone, a smartphone, an enhanced general packet radio service (EGPRS) mobile phone, a media player, a navigation device, a game console, a television, a remote control, or a combination of any two or more of these data processing devices or any other suitable data processing devices. More details on the user device 104 are provided in reference to an exemplary user device 104 shown in FIG. 2.

[0033] Examples of the communication network(s) 110 include local area networks (“LAN”) and wide area networks (“WAN”), e.g., the Internet. The communication network(s) 110 may be implemented using any known network protocol, including various wired or wireless protocols, such as Ethernet, Universal Serial Bus (USB), FIREWIRE, Global System for Mobile Communications (GSM), Enhanced Data GSM Environment (EDGE), code division multiple access (CDMA), time division multiple access (TDMA), Bluetooth, Wi-Fi, voice over Internet Protocol (VoIP), Wi-MAX, or any other suitable communication protocol.

[0034] The server system 108 can be implemented on at least one data processing apparatus and/or a distributed network of computers.

[0035] Although the digital assistant system shown in FIG. 1 includes both a client-side portion (e.g., the DA client 102) and a server-side portion (e.g., the DA server 106), in some embodiments, a digital assistant system refers only to the server-side portion (e.g., the DA server 106). Alternatively, in some embodiments, the functions of a digital assistant can be implemented as a standalone application installed on a user device. In addition, the divisions of functionalities between the client and server portions of the digital assistant can vary in different embodiments. For example, in some embodiments, the DA client 102 is a thin-client that provides only user-facing input and output processing functions, and delegates all other functionalities of the digital assistant to the DA server 106. In some other embodiments, the DA client 102 is configured to perform or assist one or more functions of the DA server 106.

[0036] FIG. 1 also illustrate web servers 120 (e.g., web server 1 (122-1), web server 2 (122-2), web server 3 (122-3), etc.). Although the one or more web servers 120 are not part of the digital assistant system, the server system 108 and/or the user device(s) 104 may communicate with one or more of the web servers 120 to retrieve one or more documents and/or information associated with the one or more documents.

[0037] FIG. 2 is a block diagram of a user device 104 in accordance with some embodiments. The user device 104 includes a memory interface 202, one or more processors 204, and a peripherals interface 206. The various components in the user device 104 are coupled by one or more communication buses or signal lines. The user device 104 includes various sensors, subsystems, and peripheral devices that are coupled to the peripherals interface 206. The sensors, subsystems, and peripheral devices gather information and/or facilitate various functionalities of the user device 104.

[0038] For example, in some embodiments, a motion sensor 210, a light sensor 212, and a proximity sensor 214 are coupled to the peripherals interface 206 to facilitate orientation, light, and proximity sensing functions. In some embodiments, other sensors 216, such as a positioning system (e.g., GPS receiver), a temperature sensor, a biometric sensor, and the like, are connected to the peripherals interface 206, to facilitate related functionalities.

[0039] In some embodiments, the user device 104 includes a camera subsystem 220 coupled to the peripherals interface 206. In some embodiments, an optical sensor 222 of the camera subsystem 220 facilitates camera functions, such as taking photographs and recording video clips. In some embodiments, the user device 104 includes one or more wired and/or wireless communication subsystems 224 provide communication functions. The communication subsystems 224 typically includes various communication ports, radio frequency receivers and transmitters, and/or optical (e.g., infrared) receivers and transmitters. In some embodiments, the user device 104 includes an audio subsystem 226 coupled to one or more speakers 228 and one or more microphones 230 to facilitate voice-enabled functions, such as voice recognition, voice replication, digital recording, and telephony functions.

[0040] In some embodiments, an I/O subsystem 240 is also coupled to the peripheral interface 206. In some embodiments, the user device 104 includes a touch screen 246, and the I/O subsystem 240 includes a touch screen controller 242 coupled to the touch screen 246. When the user device 104 includes the touch screen 246 and the touch screen controller 242, the touch screen 246 and the touch screen controller 242 are typically configured to, for example, detect contact and movement or break thereof using any of a plurality of touch sensitivity technologies, such as capacitive, resistive, infrared, surface acoustic wave technologies, proximity sensor arrays, and the like. In some embodiments, the user device 104 includes a display that does not include a touch-sensitive surface. In some embodiments, the user device 104 includes a separate touch-sensitive surface. In some embodiments, the user device 104 includes other input controller(s) 244. When the user device 104 includes the other input controller(s) 244, the other input controller(s) 244 are typically coupled to other input/control devices 248, such as one or more buttons, rocker switches, thumb-wheel, infrared port, USB port, and/or a pointer device such as a stylus.

[0041] The memory interface 202 is coupled to memory 250. In some embodiments, the memory 250 includes a non-transitory computer readable medium, such as high-speed random access memory and/or non-volatile memory (e.g., one or more magnetic disk storage devices, one or more flash memory devices, one or more optical storage devices, and/or other non-volatile solid-state memory devices).

[0042] In some embodiments, the memory 250 stores an operating system 252, a communications module 254, a graphical user interface module 256, a sensor processing module 258, a phone module 260, and applications 262, and a subset or superset thereof. The operating system 252 includes instructions for handling basic system services and for performing hardware dependent tasks. The communications module 254 facilitates communicating with one or more additional devices, one or more computers and/or one or more servers. The graphical user interface module 256 facilitates graphic user interface processing. The sensor processing module 258 facilitates sensor-related processing and functions (e.g., processing voice input received with the one or more microphones 228). The phone module 260 facilitates phone-related processes and functions. The application module 262 facilitates various functionalities of user applications, such as electronic-messaging, web browsing, media processing, navigation, imaging and/or other processes and functions. In some embodiments, the application module 262 includes, or interacts with, a web browser application 270. In some embodiments, the application module 262 includes, or interacts with, an electronic-messaging application.

[0043] As described above, in some embodiments, the memory 250 also stores client-side digital assistant instructions (e.g., in a digital assistant client module 264) and various user data 266 (e.g., user-specific vocabulary data, preference data, and/or other data such as the user's electronic address book, to-do lists, shopping lists, etc.) to provide the client-side functionalities of the digital assistant.

[0044] In various embodiments, the digital assistant client module 264 is capable of accepting voice input, text input, touch input, and/or gestural input through various user interfaces (e.g., the I/O subsystem 244) of the user device 104. The digital assistant client module 264 is also capable of providing output in audio, visual, and/or tactile forms. For example, output can be provided as voice, sound, alerts, text messages, menus, graphics, videos, animations, vibrations, and/or combinations of two or more of the above. During operation, the digital assistant client module 264 communicates with the digital assistant server (e.g., the digital assistant server 106, FIG. 1) using the communication subsystems 224.

[0045] In some embodiments, the digital assistant client module 264 utilizes various sensors, subsystems and peripheral devices to gather additional information from the surrounding environment of the user device 104 to establish a context associated with a user input. In some embodiments, the digital assistant client module 264 provides the context information or a subset thereof with the user input to the digital assistant server (e.g., the digital assistant server 106, FIG. 1) to help deduce the user's intent.

[0046] In some embodiments, the context information that can accompany the user input includes sensor information, e.g., lighting, ambient noise, ambient temperature, images or videos of the surrounding environment, etc. In some embodiments, the context information also includes the physical state of the device, e.g., device orientation, device location, device temperature, power level, speed, acceleration, motion patterns, cellular signals strength, etc. In some embodiments, information related to the software state of the user device 106, e.g., running processes, installed programs, past and present network activities, background services, error logs, resources usage, etc., of the user device 104 is also provided to the digital assistant server (e.g., the digital assistant server 106, FIG. 1) as context information associated with a user input.

[0047] In some embodiments, the DA client module 264 selectively provides information (e.g., at least a portion of the user data 266) stored on the user device 104 in response to requests from the digital assistant server. In some embodiments, the digital assistant client module 264 also elicits additional input from the user via a natural language dialogue or other user interfaces upon request by the digital assistant server 106 (FIG. 1). The digital assistant client module 264 passes the additional input to the digital assistant server 106 to help the digital assistant server 106 in intent deduction and/or fulfillment of the user's intent expressed in the user request.

[0048] In some embodiments, the memory 250 may include additional instructions or fewer instructions. Furthermore, various functions of the user device 104 may be implemented in hardware and/or in firmware, including in one or more signal processing and/or application specific integrated circuits, and the user device 104, thus, need not include all modules and applications illustrated in FIG. 2. For example, in some embodiments, the user device 104 does not include the touch screen 246.

[0049] FIG. 3 is a block diagram of an exemplary digital assistant system 300 in accordance with some embodiments. In some embodiments, the digital assistant system 300 is implemented on a standalone computer system. In some embodiments, the digital assistant system 300 is distributed across multiple computers. In some embodiments, some of the modules and functions of the digital assistant are divided into a server portion and a client portion, where the client portion resides on a user device (e.g., the user device 104) and communicates with the server portion (e.g., the server system 108) through one or more networks, e.g., as shown in FIG. 1. In some embodiments, the digital assistant system 300 is an embodiment of the server system 108 (and/or the digital assistant server 106) shown in FIG. 1. In some embodiments, the digital assistant system 300 is implemented in a user device (e.g., the user device 104, FIG. 1), thereby eliminating the need for a client-server system. It should be noted that the digital assistant system 300 is only one example of a digital assistant system, and that the digital assistant system 300 may have more or fewer components than shown, may combine two or more components, or may have a different configuration or arrangement of the components. The various components shown in FIG. 3 may be implemented in hardware, software, firmware, including one or more signal processing and/or application specific integrated circuits, or a combination of thereof.

[0050] The digital assistant system 300 includes memory 302, one or more processors 304, an input/output (I/O) interface 306, and a network communications interface 308. These components communicate with one another over one or more communication buses or signal lines 310.

[0051] In some embodiments, the memory 302 includes a non-transitory computer readable medium, such as high-speed random access memory and/or a non-volatile computer readable storage medium (e.g., one or more magnetic disk storage devices, one or more flash memory devices, one or more optical storage devices, and/or other non-volatile solid-state memory devices).

[0052] The I/O interface 306 couples input/output devices 316 of the digital assistant system 300, such as displays, a keyboard, touch screens, and microphones, to the user interface module 322. The I/O interface 306, in conjunction with the user interface module 322, receives user inputs (e.g., voice input, keyboard inputs, touch inputs, etc.) and process them accordingly. In some embodiments, when the digital assistant is implemented on a standalone user device, the digital assistant system 300 includes any of the components and I/O and communication interfaces described with respect to the user device 104 in FIG. 2 (e.g., one or more microphones 228). In some embodiments, the digital assistant system 300 represents the server portion of a digital assistant implementation, and interacts with the user through a client-side portion residing on a user device (e.g., the user device 104 shown in FIG. 2).

[0053] In some embodiments, the network communications interface 308 includes wired communication port(s) 312 and/or wireless transmission and reception circuitry 314. The wired communication port(s) receive and send communication signals via one or more wired interfaces, e.g., Ethernet, Universal Serial Bus (USB), FIREWIRE, etc. The wireless circuitry 314 typically receives and sends RF signals and/or optical signals from/to communications networks and other communications devices. The wireless communications may use any of a plurality of communications standards, protocols and technologies, such as GSM, EDGE, CDMA, TDMA, Bluetooth, Wi-Fi, VoIP, Wi-MAX, or any other suitable communication protocol. The network communications interface 308 enables communication between the digital assistant system 300 with networks, such as the Internet, an intranet and/or a wireless network, such as a cellular telephone network, a wireless local area network (LAN) and/or a metropolitan area network (MAN), and other devices.

[0054] In some embodiments, the non-transitory computer readable storage medium of memory 302 stores programs, modules, instructions, and data structures including all or a subset of: an operating system 318, a communications module 320, a user interface module 322, one or more applications 324, and a digital assistant module 326. The one or more processors 304 execute these programs, modules, and instructions, and reads/writes from/to the data structures.

[0055] The operating system 318 (e.g., Darwin, RTXC, LINUX, UNIX, OS X, WINDOWS, or an embedded operating system such as VxWorks) includes various software components and/or drivers for controlling and managing general system tasks (e.g., memory management, storage device control, power management, etc.) and facilitates communications between various hardware, firmware, and software components.

[0056] The communications module 320 facilitates communications between the digital assistant system 300 with other devices over the network communications interface 308. For example, the communication module 320 may communicate with the communications module 254 of the device 104 shown in FIG. 2. The communications module 320 also includes various software components for handling data received by the wireless circuitry 314 and/or wired communications port 312.

[0057] In some embodiments, the user interface module 322 receives commands and/or inputs from a user via the I/O interface 306 (e.g., from a keyboard, touch screen, and/or microphone), and provides user interface objects on a display.

[0058] The applications 324 include programs and/or modules that are configured to be executed by the one or more processors 304. For example, if the digital assistant system is implemented on a standalone user device, the applications 324 may include user applications, such as games, a calendar application, a navigation application, a web browser application, or an email application. If the digital assistant system 300 is implemented on a server farm, the applications 324 may include resource management applications, diagnostic applications, or scheduling applications, for example.

[0059] The memory 302 also stores the digital assistant module (or the server portion of a digital assistant) 326. In some embodiments, the digital assistant module 326 includes the following sub-modules, or a subset or superset thereof: an input/output processing module 328, a speech-to-text (STT) processing module 330, a natural language processing module 332, a dialogue flow processing module 334, a task flow processing module 336, and a service processing module 338. Each of these processing modules has access to one or more of the following data and models of the digital assistant 326, or a subset or superset thereof: ontology 360, vocabulary index 344, user data 348, task flow models 354, and service models 356.

[0060] In some embodiments, using the processing modules (e.g., the input/output processing module 328, the STT processing module 330, the natural language processing module 332, the dialogue flow processing module 334, the task flow processing module 336, and/or the service processing module 338), data, and models implemented in the digital assistant module 326, the digital assistant system 300 performs at least some of the following: identifying a user's intent expressed in a natural language input received from the user; actively eliciting and obtaining information needed to fully deduce the user's intent (e.g., by disambiguating words, names, intentions, etc.); determining the task flow for fulfilling the deduced intent; and executing the task flow to fulfill the deduced intent. In some embodiments, the digital assistant also takes appropriate actions when a satisfactory response was not or could not be provided to the user for various reasons.

[0061] In some embodiments, the I/O processing module 328 interacts with the user through the I/O devices 316 or with a user device (e.g., a user device 104 in FIG. 1) through the network communications interface 308 to obtain user input (e.g., a speech input) and to provide responses to the user input. The I/O processing module 328 optionally obtains context information associated with the user input from the user device, along with or shortly after the receipt of the user input. The context information includes user-specific data, vocabulary, and/or preferences relevant to the user input. In some embodiments, the context information also includes software and hardware states of the device (e.g., the user device 104 in FIG. 1) at the time the user request is received, and/or information related to the surrounding environment of the user at the time that the user request was received. In some embodiments, the I/O processing module 328 also sends follow-up questions to, and receives answers from, the user regarding the user request. In some embodiments, when a user request is received by the I/O processing module 328 and the user request contains a speech input, the I/O processing module 328 forwards the speech input to the speech-to-text (STT) processing module 330 for speech-to-text conversions.

[0062] In some embodiments, the speech-to-text processing module 330 receives speech input (e.g., a user utterance captured in a voice recording) through the I/O processing module 328. In some embodiments, the speech-to-text processing module 330 uses various acoustic and language models to recognize the speech input as a sequence of phonemes, and ultimately, a sequence of words or tokens written in one or more languages. The speech-to-text processing module 330 is implemented using any suitable speech recognition techniques, acoustic models, and language models, such as Hidden Markov Models, Dynamic Time Warping (DTW)-based speech recognition, and other statistical and/or analytical techniques. In some embodiments, the speech-to-text processing can be performed at least partially by a third party service or on the user's device. Once the speech-to-text processing module 330 obtains the result of the speech-to-text processing (e.g., a sequence of words or tokens), it passes the result to the natural language processing module 332 for intent deduction.

[0063] The natural language processing module 332 (“natural language processor”) of the digital assistant 326 takes the sequence of words or tokens (“token sequence”) generated by the speech-to-text processing module 330, and attempts to associate the token sequence with one or more “actionable intents” recognized by the digital assistant. As used herein, an “actionable intent” represents a task that can be performed by the digital assistant 326 and/or the digital assistant system 300, and has an associated task flow implemented in the task flow models 354. The associated task flow is a series of programmed actions and steps that the digital assistant system 300 takes in order to perform the task. The scope of a digital assistant system's capabilities is dependent on the number and variety of task flows that have been implemented and stored in the task flow models 354, or in other words, on the number and variety of “actionable intents” that the digital assistant system 300 recognizes. The effectiveness of the digital assistant system 300, however, is also dependent on the digital assistant system's ability to deduce the correct “actionable intent(s)” from the user request expressed in natural language.

[0064] In some embodiments, in addition to the sequence of words or tokens obtained from the speech-to-text processing module 330, the natural language processor 332 also receives context information associated with the user request (e.g., from the I/O processing module 328). The natural language processor 332 optionally uses the context information to clarify, supplement, and/or further define the information contained in the token sequence received from the speech-to-text processing module 330. The context information includes, for example, user preferences, hardware and/or software states of the user device, sensor information collected before, during, or shortly after the user request, prior interactions (e.g., dialogue) between the digital assistant and the user, and the like.

[0065] In some embodiments, the natural language processing is based on ontology 360. The ontology 360 is a hierarchical structure containing a plurality of nodes, each node representing either an “actionable intent” or a “property” relevant to one or more of the “actionable intents” or other “properties”. As noted above, an “actionable intent” represents a task that the digital assistant system 300 is capable of performing (e.g., a task that is “actionable” or can be acted on). A “property” represents a parameter associated with an actionable intent or a sub-aspect of another property. A linkage between an actionable intent node and a property node in the ontology 360 defines how a parameter represented by the property node pertains to the task represented by the actionable intent node.

[0066] In some embodiments, the ontology 360 is made up of actionable intent nodes and property nodes. Within the ontology 360, each actionable intent node is linked to one or more property nodes either directly or through one or more intermediate property nodes. Similarly, each property node is linked to one or more actionable intent nodes either directly or through one or more intermediate property nodes.

[0067] An actionable intent node, along with its linked concept nodes, may be described as a “domain.” In the present discussion, each domain is associated with a respective actionable intent, and refers to the group of nodes (and the relationships therebetween) associated with the particular actionable intent. In some embodiments, the ontology 360 is made up of many domains. Each domain may share one or more property nodes with one or more other domains.

[0068] In some embodiments, the ontology 360 includes all the domains (and hence actionable intents) that the digital assistant is capable of understanding and acting upon. In some embodiments, the ontology 360 may be modified, such as by adding or removing domains or nodes, or by modifying relationships between the nodes within the ontology 360.

[0069] In some embodiments, nodes associated with multiple related actionable intents may be clustered under a “super domain” in the ontology 360. For example, a “travel” super-domain may include a cluster of property nodes and actionable intent nodes related to travels. The actionable intent nodes related to travels may include “airline reservation,” “hotel reservation,” “car rental,” “get directions,” “find points of interest,” and so on. The actionable intent nodes under the same super domain (e.g., the “travels” super domain) may have many property nodes in common. For example, the actionable intent nodes for “airline reservation,” “hotel reservation,” “car rental,” “get directions,” “find points of interest” may share one or more of the property nodes “start location,” “destination,” “departure date/time,” “arrival date/time,” and “party size.”

[0070] In some embodiments, each node in the ontology 360 is associated with a set of words and/or phrases that are relevant to the property or actionable intent represented by the node. The respective set of words and/or phrases associated with each node is the so-called “vocabulary” associated with the node. The respective set of words and/or phrases associated with each node can be stored in the vocabulary index 344 in association with the property or actionable intent represented by the node. For example, the vocabulary associated with the node for the property of “restaurant” may include words such as “food,” “drinks,” “cuisine,” “hungry,” “eat,” “pizza,” “fast food,” “meal,” and so on. For another example, the vocabulary associated with the node for the actionable intent of “initiate a phone call” may include words and phrases such as “call,” “phone,” “dial,” “ring,” “call this number,” “make a call to,” and so on. The vocabulary index 344 optionally includes words and phrases in different languages.

[0071] In some embodiments, the natural language processor 332 receives the token sequence (e.g., a text string) from the speech-to-text processing module 330, and determines what nodes are implicated by the words in the token sequence. In some embodiments, if a word or phrase in the token sequence is found to be associated with one or more nodes in the ontology 360 (via the vocabulary index 344), the word or phrase will “trigger” or “activate” those nodes. When multiple nodes are “triggered,” based on the quantity and/or relative importance of the activated nodes, the natural language processor 332 will select one of the actionable intents as the task (or task type) that the user intended the digital assistant to perform. In some embodiments, the domain that has the most “triggered” nodes is selected. In some embodiments, the domain having the highest confidence value (e.g., based on the relative importance of its various triggered nodes) is selected. In some embodiments, the domain is selected based on a combination of the number and the importance of the triggered nodes. In some embodiments, additional factors are considered in selecting the node as well, such as whether the digital assistant system 300 has previously correctly interpreted a similar request from a user.

[0072] In some embodiments, the digital assistant system 300 also stores names of specific entities in the vocabulary index 344, so that when one of these names is detected in the user request, the natural language processor 332 will be able to recognize that the name refers to a specific instance of a property or sub-property in the ontology. In some embodiments, the names of specific entities are names of businesses, restaurants, people, movies, and the like. In some embodiments, the digital assistant system 300 can search and identify specific entity names from other data sources, such as the user's address book, a movies database, a musicians database, and/or a restaurant database. In some embodiments, when the natural language processor 332 identifies that a word in the token sequence is a name of a specific entity (such as a name in the user's address book), that word is given additional significance in selecting the actionable intent within the ontology for the user request.

[0073] For example, when the words “Mr. Santo” is recognized from the user request, and the last name “Santo” is found in the vocabulary index 344 as one of the contacts in the user's contact list, then it is likely that the user request corresponds to a “send a message” or “initiate a phone call” domain. For another example, when the words “ABC Café” are found in the user request, and the term “ABC Café” is found in the vocabulary index 344 as the name of a particular restaurant in the user's city, then it is likely that the user request corresponds to a “restaurant reservation” domain.

[0074] User data 348 includes user-specific information, such as user-specific vocabulary, user preferences, user address, user's default and secondary languages, user's contact list, and other short-term or long-term information for each user. The natural language processor 332 can use the user-specific information to supplement the information contained in the user input to further define the user intent. For example, for a user request “invite my friends to my birthday party,” the natural language processor 332 is able to access user data 348 to determine who the “friends” are and when and where the “birthday party” would be held, rather than requiring the user to provide such information explicitly in his/her request.

[0075] Once the natural language processor 332 identifies an actionable intent (or domain) based on the user request, the natural language processor 332 generates a structured query to represent the identified actionable intent. In some embodiments, the structured query includes parameters for one or more nodes within the domain for the actionable intent, and at least some of the parameters are populated with the specific information and requirements specified in the user request. For example, the user may say “Make me a dinner reservation at a sushi place at 7.” In this case, the natural language processor 332 may be able to correctly identify the actionable intent to be “restaurant reservation” based on the user input. According to the ontology, a structured query for a “restaurant reservation” domain may include parameters such as {Cuisine}, {Time}, {Date}, {Party Size}, and the like. Based on the information contained in the user's utterance, the natural language processor 332 may generate a partial structured query for the restaurant reservation domain, where the partial structured query includes the parameters {Cuisine=“Sushi”} and {Time=“7pm”}. However, in this example, the user's utterance contains insufficient information to complete the structured query associated with the domain. Therefore, other necessary parameters such as {Party Size} and {Date} are not specified in the structured query based on the information currently available. In some embodiments, the natural language processor 332 populates some parameters of the structured query with received context information. For example, if the user requested a sushi restaurant “near me,” the natural language processor 332 may populate a {location} parameter in the structured query with GPS coordinates from the user device 104.

[0076] In some embodiments, the natural language processor 332 passes the structured query (including any completed parameters) to the task flow processing module 336 (“task flow processor”). The task flow processor 336 is configured to perform one or more of: receiving the structured query from the natural language processor 332, completing the structured query, and performing the actions required to “complete” the user's ultimate request. In some embodiments, the various procedures necessary to complete these tasks are provided in task flow models 354. In some embodiments, the task flow models 354 include procedures for obtaining additional information from the user, and task flows for performing actions associated with the actionable intent.

[0077] As described above, in order to complete a structured query, the task flow processor 336 may need to initiate additional dialogue with the user in order to obtain additional information, and/or disambiguate potentially ambiguous utterances. When such interactions are necessary, the task flow processor 336 invokes the dialogue processing module 334 to engage in a dialogue with the user. In some embodiments, the dialogue processing module 334 determines how (and/or when) to ask the user for the additional information, and receives and processes the user responses. In some embodiments, the questions are provided to and answers are received from the users through the I/O processing module 328. For example, the dialogue processing module 334 presents dialogue output to the user via audio and/or visual output, and receives input from the user via spoken or physical (e.g., touch gesture) responses. Continuing with the example above, when the task flow processor 336 invokes the dialogue processing module 334 to determine the “party size” and “date” information for the structured query associated with the domain “restaurant reservation,” the dialogue flow processor 334 generates questions such as “For how many people?” and “On which day?” to pass to the user. Once answers are received from the user, the dialogue processing module 334 populates the structured query with the missing information, or passes the information to the task flow processor 336 to complete the missing information from the structured query.

[0078] In some cases, the task flow processor 336 may receive a structured query that has one or more ambiguous properties. For example, a structured query for the “send a message” domain may indicate that the intended recipient is “Bob,” and the user may have multiple contacts named “Bob.” The task flow processor 336 will request that the dialogue processor 334 disambiguate this property of the structured query. In turn, the dialogue processor 334 may ask the user “Which Bob?”, and display (or read) a list of contacts named “Bob” from which the user may choose.

[0079] Once the task flow processor 336 has completed the structured query for an actionable intent, the task flow processor 336 proceeds to perform the ultimate task associated with the actionable intent. Accordingly, the task flow processor 336 executes the steps and instructions in the task flow model according to the specific parameters contained in the structured query. For example, the task flow model for the actionable intent of “restaurant reservation” may include steps and instructions for contacting a restaurant and actually requesting a reservation for a particular party size at a particular time. For example, using a structured query such as: {restaurant reservation, restaurant=ABC Café, date=Mar. 12, 2012, time=7pm, party size=5}, the task flow processor 336 may perform the steps of: (1) logging onto a server of the ABC Café or a restaurant reservation system that is configured to accept reservations for multiple restaurants, such as the ABC Café, (2) entering the date, time, and party size information in a form on the website, (3) submitting the form, and (4) making a calendar entry for the reservation in the user's calendar.

[0080] In some embodiments, the task flow processor 336 employs the assistance of a service processing module 338 (“service processor”) to complete a task requested in the user input or to provide an informational answer requested in the user input. For example, the service processor 338 can act on behalf of the task flow processor 336 to make a phone call, set a calendar entry, invoke a map search, invoke or interact with other user applications installed on the user device, and invoke or interact with third party services (e.g. a restaurant reservation portal, a social networking website, a banking portal, etc.). In some embodiments, the protocols and application programming interfaces (API) required by each service can be specified by a respective service model among the services models 356. The service processor 338 accesses the appropriate service model for a service and generates requests for the service in accordance with the protocols and APIs required by the service according to the service model.

[0081] For example, if a restaurant has enabled an online reservation service, the restaurant can submit a service model specifying the necessary parameters for making a reservation and the APIs for communicating the values of the necessary parameter to the online reservation service. When requested by the task flow processor 336, the service processor 338 can establish a network connection with the online reservation service using the web address stored in the service models 356, and send the necessary parameters of the reservation (e.g., time, date, party size) to the online reservation interface in a format according to the API of the online reservation service.

[0082] In some embodiments, the natural language processor 332, dialogue processor 334, and task flow processor 336 are used collectively and iteratively to deduce and define the user's intent, obtain information to further clarify and refine the user intent, and finally generate a response (e.g., provide an output to the user, or complete a task) to fulfill the user's intent.

[0083] In some embodiments, after all of the tasks needed to fulfill the user's request have been performed, the digital assistant 326 formulates a confirmation response, and sends the response back to the user through the I/O processing module 328. If the user request seeks an informational answer, the confirmation response presents the requested information to the user. In some embodiments, the digital assistant also requests the user to indicate whether the user is satisfied with the response produced by the digital assistant 326.

[0084] FIGS. 4A-4N illustrate exemplary user interfaces displayed on a electronic device (e.g., a user device 104 described with respect to FIG. 2 or a standalone device 300 described with respect to FIG. 3) in accordance with some embodiments.

[0085] FIGS. 4A-4J illustrate exemplary user interfaces associated with navigating through and browsing one or more documents in accordance with some embodiments.

[0086] FIG. 4A illustrates an exemplary user interface containing a portion of a first document. In some embodiments, the first document includes a plurality of links indicated, for example, with underline (e.g., “a new nation,” “civil war,” “a great battle-field,” and “a portion of that field”).

[0087] FIG. 4A also illustrates that, in some embodiments, prior to outputting a voice reading of the first document, the electronic device outputs audible information indicating the current position on the first document and/or audible information including information about the first document. For example, the electronic device may output an audio signal (e.g., “beep”) or a voice indication indicating that the portion of the first document to be read is a beginning of the first document or that the electronic device is about to output a voice reading. In addition, or instead, the electronic device may output information about the first document, such as the title, author, date, and source of the first document.

[0088] FIG. 4B illustrates that the electronic device outputs a voice reading of a portion of the first document, corresponding to the text “four score and seven years ago our fathers brought forth on this continent.”

[0089] FIG. 4C illustrates that the electronic device outputs audible information identifying a link associated with the text “a new nation.” For example, the electronic device outputs a voice signal of the word “link” and/or audio signal, like a “beep.” In some embodiments, the term “link” refers to a metadata containing a location of a linked document. In some embodiments, the term “link” includes a hypertext anchor. The voice signal and the audio signal may be output before or after outputting a voice reading of the text associated with the link. In some embodiments, the electronic device also outputs information about the link, such as the title, author, date, and source of a linked document.

[0090] In some embodiments, the electronic device pauses for a predefined period (e.g., one, two, three, four, or five seconds, etc.) after outputting the voice signal, the audio signal, information about the link, and/or a voice reading of the text associated with the link.

[0091] FIG. 4D illustrates that the electronic device outputs a voice reading of a portion of the first document subsequent to the text associated with the link.

[0092] In some embodiments, the electronic device receives a voice command from a user. In some embodiments, the electronic device receives the voice command from the user while the electronic device outputs the voice signal, the audio signal, information about the link, and/or a voice reading of the text associated with the link; during the pause; or while the electronic device outputs a voice reading of a portion of the document subsequent to the text associated with the link. In some embodiments, the electronic device receives the voice command from the user prior to outputting a voice signal and/or an audio signal about a second link distinct from the link.

[0093] In some embodiments, the voice command is a request to navigate to the linked document (e.g., “follow the link”). In some embodiments, the electronic device stores a last voiced-out portion of the document. In some embodiments, the electronic device stores information about the link (e.g., the position and/or identification of the link) in lieu of the last voiced-out portion of the document.

[0094] FIG. 4E illustrates that the electronic device displays a portion of the linked document, and outputs a voice reading of a portion of the linked document. In some embodiments, prior to outputting a voice reading of the linked document, the electronic device outputs audible information indicating the current position on the document and/or audible information including information about the document. For example, the electronic device may output an audio signal (e.g., “beep”) or a voice indication indicating that the portion of the document to be read is a beginning of a document or that the electronic device is about to output a voice reading. In addition, or instead, the electronic device may output information about the document, such as the title, author, date, and source of the document. Furthermore, the electronic device may output an audio signal or a voice indication indicating that the portion of the document to be read is a heading, a new line, a new sentence, and/or a new paragraph.

[0095] FIG. 4F illustrates that the electronic device further outputs a voice reading of a subsequent portion of the linked document. Similarly, the electronic device may continue outputting a voice reading of the remaining portion of the linked document.

[0096] FIG. 4G illustrates that the electronic device outputs a voice reading of a last sentence of the linked document.

[0097] In some embodiments, while the electronic device outputs a voice reading of one or more portions of the linked document, the electronic device receives a voice command from the user requesting navigation back to the first document. FIG. 4H illustrates that, in response, the electronic device displays one or more portions of the first document and outputs a voice reading of a portion of the first document.

[0098] In some embodiments, the electronic device outputs a voice inquiry about navigating back to the first document. In some embodiments, the electronic device outputs a voice inquiry about navigating back to the first document after outputting a voice reading of the last sentence of the linked document. When the user provides a voice command requesting navigation back to the first document, the electronic device outputs a voice reading of a portion of the first document, as explained above (i.e., navigates back to the first document). Alternatively, in some embodiments, the electronic device automatically navigates back to the first document without receiving a voice command from the user, for example, when the electronic device completes outputting a voice reading of the linked document.

[0099] In some embodiments, when the electronic device resumes outputting a voice reading of the first document, the electronic device starts outputting a voice reading of a portion of the first document that corresponds to the last voiced-out portion of the first document. In some embodiments, the electronic device resumes by outputting a voice reading of the text associated with the link. In some embodiments, the electronic device resumes by outputting a voice reading of a portion of the first document subsequent to the text associated with the link. In some embodiments, the electronic device resumes by outputting a voice reading of a sentence that includes the text associated with the link. In some embodiments, the electronic device resumes by outputting a voice reading of a paragraph that includes the text associated with the link.

[0100] FIG. 4I illustrates that the electronic device outputs a voice reading of a portion of a next paragraph in the first document. In some embodiments, prior to outputting a voice reading of a portion of the next paragraph, the electronic device outputs audible information indicating the current position on the document. For example, the electronic device may output an audio signal (e.g., “beep”) or a voice indication indicating that the portion of the document to be read is a new line, a new sentence, and/or a new paragraph.

[0101] FIG. 4J illustrates that, in some embodiments, a document includes multiple portions with respective styles. In other words, a first portion of the document may include a first style and a second portion of the document includes a second style. For example, a first paragraph of the document illustrated in FIG. 4J has a first style (e.g., the paragraph is in non-italicized fonts) and subsequent paragraphs of the document has a second style (e.g., the paragraphs are in italicized fonts) distinct from the first style. The electronic device outputs the voice reading of the first portion of the document using a first set of voice characteristics (e.g., an adult female voice) and the voice reading of the second portion of the document using a second set of voice characteristics (e.g., an adult male voice). Voice characteristics may include one or more of pitch, speed, and volume, and/or characteristics typical to a particular group of speakers classified based on, for example, gender (e.g., male or female) and age (e.g., adult or child).

[0102] FIGS. 4K-4N illustrate exemplary user interfaces associated with identifying one or more documents in accordance with some embodiments. Although the exemplary user interfaces illustrated in FIGS. 4K-4N include email messages, analogous methods can be used with other types of documents, such as book chapters, encyclopedia entries, etc.

[0103] FIG. 4K illustrates an exemplary user interface of an electronic message. The electronic device outputs a voice reading of at least a portion of the message (e.g., “an email from David to you, John, Karen, and Paul. Subject New Feature. The message says ‘This looks really good. Team, what do you think.’”).

[0104] In some embodiments, the electronic device receives a voice command from the user requesting one or more documents corresponding to particular criteria. For example, in some embodiments, the particular criteria are that the one or more documents be authored by one or more authors (e.g., “find email messages from David,” “find email messages from David, John, Karen, and Paul,” “find email messages from addresses of this email,” etc.). In other embodiments, the particular criteria are that the one or more documents be associated with a particular document (e.g., “find email messages in this thread,” “find replies to this email,” etc.). In yet other embodiments, the particular criteria are that the one or more documents be replies to a particular document. In still other embodiments, the particular criteria are that the one or more documents include a last message from a respective author (e.g., “find a last email from David”). In some embodiments, the particular criteria are that the one or more documents include a first message from the respective author.

[0105] In some embodiments, the particular criteria are that the one or more documents correspond to a particular date range (e.g., “find emails received last week,” “find email messages received from January 1 to March 31,” etc.). In some embodiments, the particular date range corresponds to a single date.

[0106] In some embodiments, the particular criteria includes one or more of the above-mentioned criteria (e.g., “find emails from David and Karen received last week”).

[0107] FIG. 4L illustrates that an exemplary user interface displayed in response to the user requesting email messages authored by a particular author, e.g., David. The electronic device outputs a voice reading of the list of email messages. In some embodiments, the electronic device outputs audible information indicating the number of email messages in the list.

[0108] FIG. 4M illustrates an alternative user interface displayed in response to the user requesting replies to the previously displayed email message. The electronic device outputs a voice reading of the list of replies. In some embodiments, the electronic device outputs audible information indicating the number of email messages in the list.

[0109] In some embodiments, the electronic device outputs a voice reading of email messages in the list (e.g., the list illustrated in FIG. 4L or FIG. 4M). In some embodiments, when the electronic device outputs a voice reading of a last email in the list, the electronic device outputs audible information indicating that the email that is read out is the last email in the list.

[0110] Although FIGS. 4A-4N illustrate exemplary user interfaces displayed on the electronic device, in some embodiments, the electronic device outputs audible information (e.g., a voice reading and/or audible signals) without displaying the exemplary user interfaces on the electronic device. In some embodiments, the electronic device does not include a display at all.

[0111] FIG. 5 is a flow chart illustrating operations for navigating through documents performed by an electronic device (e.g., a user device 104 described with respect to FIG. 2 or a standalone device 300 described with respect to FIG. 3) in accordance with some embodiments. In some embodiments, the electronic device includes a portable electronic device. In some embodiments, the electronic device includes a computer system.

[0112] These operations are merely exemplary and fewer or less operations may be performed by the electronic device in various embodiments.

[0113] In some embodiments, the electronic device receives (502) a first document.

[0114] The electronic device outputs (504) a voice reading of a portion of the document (e.g., FIG. 4B).

[0115] In some embodiments, the electronic device determines (506) whether the portion of the document includes a link. If the portion of the document includes a link, the electronic device outputs (508) audible information identifying a link of the plurality of links (e.g., a voice output of the word “link” or an audio signal “beep” and/or information about the link, such as the title, author, date, and source of a linked document, as described with respect to FIG. 4C).

[0116] In some embodiments, the electronic device receives a voice command from a user. In some embodiments, the electronic device determines (510) whether the electronic device has received a voice command.

[0117] In some embodiments, when the electronic device receives a voice command, the electronic device determines (512) whether the received voice command is a navigation command (e.g., whether the received voice command includes a request for navigation to a second document associated with the link (i.e., a linked document)). If the received voice command includes a request for navigation to a linked document, the electronic device retrieves (514) the linked document. The electronic device then outputs (504) a voice reading of one or more portions of the linked document (e.g., FIG. 4E).

[0118] In some embodiments, when the electronic device receives a voice command, the electronic device determines (512) whether the received voice command is a navigation command (e.g., whether the received voice command includes a request for navigation to a second document associated with the link (i.e., a linked document)). If the received voice command includes a request for navigation to a linked document, the electronic device retrieves (514) the linked document. The electronic device then outputs (504) a voice reading of one or more portions of the linked document (e.g., FIG. 4E).

[0119] In some embodiments, when the electronic device receives a voice command, the electronic device determines (516) whether the received voice command is an information command (e.g., whether the received voice command includes a request for information about the linked document). If the received voice command includes a request for information about the linked document (e.g., title, author, date, source, abstract, summary, first sentence, first paragraph, etc.), such as “who is the author,” the electronic device retrieves (518) the requested information. In some embodiments, at least a portion of the requested information is obtained from the linked document (e.g., title, author, date, and abstract). In some embodiments, at least a portion of the requested information is obtained by processing the linked document (e.g., summarizing the linked document). In some embodiments, at least a portion of the requested information is provided by a third party server (e.g., review of the linked document). The electronic device outputs (520) a voice reading of the requested information. In other embodiments, the electronic device receives at least a portion of the requested information from metadata of the linked document, or retrieves information from other sources associated with the linked document to get details.

[0120] In some embodiments, when a user provides a voice command between two adjacent links or immediately after two adjacent links, the electronic device identifies the two links as candidate links corresponding to the voice command. Because the user's voice command may be directed to a first or second link of the two adjacent links, there may be a need to clarify with respect to which link the user's voice command should be performed. In some embodiments, the electronic device outputs audible information about the candidate links and/or an audible inquiry about which link the user wants to perform the voice command on. For example, while the electronic device outputs a voice reading of a sentence “the next game between School A and School B is on March 3,” a user provides a voice command “follow the link.” In some embodiments, the electronic device outputs an audible inquiry “which link?” and receives a subsequent voice command from the use. When the subsequent voice command is “School B,” the electronic device retrieves a document linked with the text “School B” and outputs a voice reading of a portion of the linked document.

[0121] In some embodiments, after outputting a voice reading of a respective portion of the document, the electronic device determines (522) whether the end of the document has been reached (e.g., whether the electronic device has output a voice reading of the entire document). If the end of the document has not been reached, the electronic device outputs (504) a voice reading of a subsequent portion of the document. In some embodiments, if the end of the document has been reached, the electronic device waits for a navigation command from the user. When the electronic device receives (524) a navigation command from the user requesting navigation to a previous document or a new document, the electronic device retrieves (526) the previous document or the new document. As described previously, these operations (e.g., operations 522, 524, and 526, etc.) may be performed by a server or a mobile device. In some embodiments, prior to receiving the navigation command from the user, the electronic device outputs a voice inquiry about whether the user wants to navigate to another document (e.g., as described with respect to FIG. 4G). In some embodiments, when the user does not want to navigate to another document, the electronic device stops outputting a voice reading.

[0122] FIG. 6 is a flow chart illustrating operations for browsing a document performed by an electronic device (e.g., a user device 104 described with respect to FIG. 2 or a standalone device 300 described with respect to FIG. 3) in accordance with some embodiments. In some embodiments, the electronic device includes a portable electronic device. In some embodiments, the electronic device includes a computer system.

[0123] These operations are merely exemplary and fewer or less operations may be performed by the electronic device in various embodiments.

[0124] In some embodiments, the electronic device receives (602) a document having a plurality of portions. At least some of the portions are associated with respective metadata. In some embodiments, the respective metadata indicate the structure of the document (e.g., paragraphs, sentences, headings, styles, etc.)

[0125] The electronic device outputs (604) a voice reading of a respective portion of the document. While outputting the voice reading of the respective portion of the document, the electronic device audibly distinguishes each respective portion based on that portion's respective metadata. For example, the electronic device determines (606) whether the respective portion corresponds to a signpost. As used herein, a signpost refers to a predefined location or a predefined type of locations in the document. In some embodiments, when the respective portion corresponds to a signpost, the electronic device outputs (608) a voice signal or an audio signal to indicate whether the portion corresponds to a signpost. For example, in some embodiments, at the start of a new paragraph, the electronic device outputs a voice signal or an audio signal to indicate the beginning of the new paragraph. Similarly, in some embodiments, a voice signal or an audio signal is used to indicate that a beginning or end of a section and/or to indicate a bookmark.

[0126] Subsequent to outputting a voice signal or an audio signal to indicate whether the portion corresponds to a signpost (e.g., after outputting a voice reading of a couple of paragraphs after outputting a voice signal or an audio signal to indicate whether the portion corresponds to a signpost), the electronic device receives a voice command from the user and determines (610) whether the voice command is a navigation command. When the voice command is a navigation command requesting navigation to the signpost, the electronic device navigates (614) to the portion corresponding to the signpost, and outputs (604) a voice reading of the portion corresponding to the signpost.

[0127] In some embodiments, after outputting a voice reading of a respective portion of the document, the electronic device determines (616) whether the end of the document has been reached (e.g., whether the electronic device has output a voice reading of the entire document). If the end of the document has not been reached, the electronic device outputs (604) a voice reading of a subsequent portion of the document.

[0128] FIG. 7 is a flow chart illustrating operations for identifying a set of documents performed by an electronic device (e.g., a user device 104 described with respect to FIG. 2 or a standalone device 300 described with respect to FIG. 3) in accordance with some embodiments. In some embodiments, the electronic device includes a portable electronic device. In some embodiments, the electronic device includes a computer system.

[0129] These operations are merely exemplary and fewer or less operations may be performed by the electronic device in various embodiments.

[0130] In some embodiments, the electronic device outputs (702) a voice reading of at least a portion of a document.

[0131] The electronic device receives (704) from a user a voice command requesting a document corresponding to a particular criteria. In some embodiments, the electronic device receives at least a portion of the voice command while outputting the voice reading. In some embodiments, the particular criteria requires that the one or more identified documents be (706) authored by one or more authors identified by the user. In some embodiments, the particular criteria requires that the one or more identified documents be (708) associated with a particular document. In some embodiments, the particular criteria requires that the one or more identified documents be (710) replies to a particular document. In some embodiments, the particular criteria requires that the one or more identified documents include (712) a last message from a respective author. In some embodiments, the particular criteria requires that the one or more identified documents correspond (714) to a particular date range identified by the user.

[0132] In some embodiments, prior to receiving the voice command requesting a document corresponding to the particular criteria, the electronic device receives from the user a request for information regarding the document (e.g., author, word count, date of last update, a number of sections in the document, etc.). In some embodiments, in response to the request for the information regarding the document, the electronic device outputs audible information includes the requested information regarding the document. In some embodiments, the electronic device retrieves the requested information from one or more remote computer systems (e.g., one or more search engines and/or database servers). In some embodiments, the electronic device determines the requested information from the document.

[0133] In some embodiments, the electronic device receives from the user a request to store the requested information and, in response, stores the requested information (e.g., on the electronic device or remotely). In some embodiments, the electronic device stores the requested information without a request from the user to store the requested information.

[0134] In one example, the request is for a length of the document (e.g., “how long is this article?”), and, in response to the request for the length of the document, the electronic device determines the length of the document (e.g., word count or page count) and outputs audible information that includes the length of the document. In another example, the request is for whether the document was updated (e.g., “was this article updated?), and in response to the request for whether the document was updated, the electronic device determines whether the document has been updated and outputs audible information that indicates whether the document has been updated (e.g., “there are corrections to the article.”). In yet another example, the request is for an author of the document (e.g., “who wrote this article?”). In some embodiments, in response to the request for the author of the document, the electronic device outputs audible information that includes the author of the document. In some cases, the author information is extracted from the document (e.g., in the text portion as “authored by” or in an author field in a markup language). In some cases, the author information is extracted from a web page that links to the document.

[0135] In some embodiments, the electronic device receives a request for additional information based on the requested information, obtains the additional information, and outputs the additional information. In some of the examples described above with respect to the author information, after outputting audible information that includes the author of the document, the electronic device receives a request for other documents authored by the same author (e.g., “what other articles did this author write?”), and in response, obtains information that includes other documents authored by the author of the document, and outputs the information. In some embodiments, the electronic device obtains the information that includes other documents authored by the author of the document by sending a request to one or more remote computer systems (e.g., one or more search engines and/or database servers) receiving at least a portion of the information from at least a subset of the one or more remote computer systems.

[0136] In some embodiments, while outputting the voice reading of at least a portion of the document, the electronic device receives from the user a request to store information regarding the document. In some embodiments, in response to receiving the request to store information regarding the document, the electronic device stores the information regarding the document. For example, in some embodiments, the request is to bookmark the document (e.g., “bookmark this article”), and the electronic device stores access information for the document (e.g., a universal resource locator for the document) as a bookmark. In some embodiments, the electronic device stores the access information for the document on the electronic device. In some embodiments, the electronic device stores the access information at a remote server.

[0137] It would be obvious to a person having ordinary skill in the art that in some embodiments, the electronic device provides the requested information without performing subsequent operations (e.g., operations 716, 718, and 720 described below).

[0138] The electronic device identifies (716) one or more documents that correspond to the particular criteria (e.g., FIGS. 4L and 4M).

[0139] The electronic device outputs (718) a voice reading of at least a portion of a respective document of the one or more identified documents.

[0140] In some embodiments, after outputting a voice reading of a respective portion of the document, the electronic device determines (720) whether the end of the document has been reached (e.g., whether the electronic device has output a voice reading of the entire document). If the end of the document has not been reached, the electronic device outputs (718) a voice reading of a subsequent portion of the document.

[0141] In some embodiments, if the end of the document has been reached, the electronic device determines whether all documents in the one or more identified documents have been read. If all documents in the one or more identified documents have not been read, the electronic device outputs a voice reading of a portion of a next document in the one or more identified documents.

[0142] In accordance with some embodiments, FIG. 8 shows a functional block diagram of electronic device 800 configured in accordance with the principles of the invention as described above. The functional blocks of the device may be implemented by hardware, software, or a combination of hardware and software to carry out the principles of the invention. It is understood by persons of skill in the art that the functional blocks described in FIG. 8 may be combined or separated into sub-blocks to implement the principles of the invention as described above. Therefore, the description herein may support any possible combination or separation or further definition of the functional blocks described herein.

[0143] As shown in FIG. 8, electronic device 800 includes audio input unit 804 and audio output unit 806. In some embodiments, electronic device 800 includes display unit 802 configured to display one or more portions of an electronic document. In some embodiments, electronic device 800 includes touch-sensitive surface unit 808 configured to detect one or more gestures on touch-sensitive surface unit 808. Electronic device further includes processing unit 810 coupled to audio input unit 804 and audio output unit 806. In some embodiments, processing unit 810 is also coupled to display unit 802 and touch-sensitive surface unit 808. In some embodiments, processing unit 810 includes document receiving unit 812, outputting unit 814, voice command receiving unit 816, storing unit 818, retrieving unit 820, identifying unit 822, and user selection receiving unit 824.

[0144] Processing unit 810 is configured to receive a first document comprising a plurality of links (e.g., with document receiving unit 812). Processing unit 810 is configured to output a voice reading of at least a portion of the first document (e.g., with outputting unit 814 through audio output unit 806). Processing unit 810 is configured to output audible information identifying a link of the plurality of links (e.g., with outputting unit 814 through audio output unit 806). Processing unit 810 is configured to, in response to outputting the audible information identifying the link, receive from the user a voice command regarding the link (e.g., with voice command receiving unit 816 through audio input unit 804). Processing unit 810 is configured to, in response to receiving from the user the voice command, output a voice reading of at least a portion of a second document associated with the link (e.g., with outputting unit 814 through audio output unit 806).

[0145] In some embodiments, the link is associated with text in the portion of the first document.

[0146] In some embodiments, processing unit 810 is configured to, in response to receiving from the user the voice command regarding the link, store information about the link (e.g., with storing unit 818) and output a voice reading of one or more portions of the second document (e.g., with outputting unit 814 through audio output unit 806).

[0147] In some embodiments, processing unit 810 is configured to, after outputting the voice reading of at least a portion of the second document, receive from the user a voice command requesting navigation back to the first document (e.g., with voice command receiving unit 816 through audio input unit 804); and, in response to receiving from the user the voice command requesting navigation back to the first document, output a voice reading of one or more portions of the first document subsequent to text, in the first document, associated with the link (e.g., with outputting unit 814 through audio output unit 806).

[0148] In some embodiments, processing unit 810 is configured to, after outputting the voice reading of at least a portion of the second document, output a voice inquiry about navigating back to the first document (e.g., with outputting unit 814 through audio output unit 806); in response to outputting the voice inquiry about navigating back to the first document, receive from the user a voice command requesting navigation back to the first document (e.g., with voice command receiving unit 816 through audio input unit 804); and, in response to receiving from the user the voice command requesting navigation back to the first document, output a voice reading of one or more portions of the first document including a text, in the first document, associated with the link (e.g., with outputting unit 814 through audio output unit 806).

[0149] In some embodiments, processing unit 810 is configured to, after outputting the voice reading of at least a portion of the second document, in response to receiving from the user the voice command requesting navigation back to the first document, automatically output a voice reading of one or more portions of the first document subsequent to text, in the first document, associated with the link (e.g., with outputting unit 814 through audio output unit 806).

[0150] In some embodiments, the voice command is a voice command of a first type. In some embodiments, processing unit 810 is configured to receive from the user a voice command of a second type distinct, from the first type, regarding the link (e.g., with voice command receiving unit 816 through audio input unit 804); and, in response to receiving from the user the voice command of the second type regarding the link, retrieve information from the second document (e.g., with retrieving unit 820); and output voice information corresponding to the voice command of the second type based on the information from the second document (e.g., with outputting unit 814 through audio output unit 806).

[0151] In some embodiments, the voice command of the second type includes a request for information about an author of the second document.

[0152] In some embodiments, the voice command of the second type includes a request for a summary of the second document.

[0153] In some embodiments, processing unit 810 is configured to identify two or more links as candidate links corresponding to a voice command from the user (e.g., with identifying unit 822); output audible information about the candidate links (e.g., with outputting unit 814 through audio output unit 806); and receive from the user a selection of a single link of the candidate links (e.g., with user selection receiving unit 824 through audio input unit 804 or touch-sensitive surface unit 808).

[0154] In accordance with some embodiments, FIG. 9 shows a functional block diagram of electronic device 900 configured in accordance with the principles of the invention as described above. The functional blocks of the device may be implemented by hardware, software, or a combination of hardware and software to carry out the principles of the invention. It is understood by persons of skill in the art that the functional blocks described in FIG. 9 may be combined or separated into sub-blocks to implement the principles of the invention as described above. Therefore, the description herein may support any possible combination or separation or further definition of the functional blocks described herein.

[0155] As shown in FIG. 9, electronic device 900 includes audio input unit 904 and audio output unit 906. In some embodiments, electronic device 900 includes display unit 902 configured to display one or more portions of an electronic document. In some embodiments, electronic device 900 includes touch-sensitive surface unit 908 configured to detect one or more gestures on touch-sensitive surface unit 908. Electronic device further includes processing unit 910 coupled to audio input unit 904 and audio output unit 906. In some embodiments, processing unit 910 is also coupled to display unit 902 and touch-sensitive surface unit 908. In some embodiments, processing unit 910 includes document receiving unit 912, outputting unit 914, and voice command receiving unit 916.

[0156] Processing unit 910 is configured to receive the document having a plurality of portions (e.g., with document receiving unit 912), wherein at least some of the portions are associated with respective metadata. Processing unit 910 is configured to output a voice reading of respective portions of the document, including audibly distinguishing the respective portions based on the respective metadata (e.g., with outputting unit 914 through audio output unit 906). Processing unit 910 is configured to receive from a user a voice command requesting navigation to a particular portion associated with particular metadata (e.g., with voice command receiving unit 916 through audio input unit 904). Processing unit 910 is configured to, in response to receiving the voice command, output a voice reading of the particular portion associated with the particular metadata (e.g., with outputting unit 914 through audio output unit 906).

[0157] In some embodiments, processing unit 910 is configured to output a voice reading of the respective portions of the text to the user in accordance with respective styles of the respective portions by outputting a voice reading of a first portion of the text in the document to the user using a first set of voice characteristics (e.g., with outputting unit 914 through audio output unit 906); and outputting a voice reading of a second portion of the text in the document to the user using a second set of voice characteristics distinct from the first set of voice characteristics (e.g., with outputting unit 914 through audio output unit 906).

[0158] In some embodiments, processing unit 910 is configured to receive at least a portion of the voice command from the user (e.g., with voice command receiving unit 916 through audio input unit 904) while outputting the voice reading of one or more portions of the document.

[0159] In some embodiments, at least one of the respective portions of the document is a respective paragraph of the document.

[0160] In some embodiments, at least one of the respective portions of the document is a respective heading of the document.

[0161] In some embodiments, at least one of the respective portions of the document is a respective sentence of the document.

[0162] In some embodiments, a first portion of the document has a first style, and a second portion of the document has a second style distinct from the first style.

[0163] In some embodiments, each portion of the document is associated with a single link.

[0164] In accordance with some embodiments, FIG. 10 shows a functional block diagram of electronic device 1000 configured in accordance with the principles of the invention as described above. The functional blocks of the device may be implemented by hardware, software, or a combination of hardware and software to carry out the principles of the invention. It is understood by persons of skill in the art that the functional blocks described in FIG. 10 may be combined or separated into sub-blocks to implement the principles of the invention as described above. Therefore, the description herein may support any possible combination or separation or further definition of the functional blocks described herein.

[0165] As shown in FIG. 10, electronic device 1000 includes audio input unit 1004 and audio output unit 1006. In some embodiments, electronic device 1000 includes display unit 1002 configured to display one or more portions of an electronic document. In some embodiments, electronic device 1000 includes touch-sensitive surface unit 1008 configured to detect one or more gestures on touch-sensitive surface unit 1008. Electronic device further includes processing unit 1010 coupled to audio input unit 1004 and audio output unit 1006. In some embodiments, processing unit 1010 is also coupled to display unit 1002 and touch-sensitive surface unit 1008. In some embodiments, processing unit 1010 includes outputting unit 1012, voice command receiving unit 1014, and identifying unit 1016.

[0166] Processing unit 1010 is configured to output a voice reading of at least a portion of a document of a plurality of documents (e.g., with outputting unit 1012 through audio output unit 1006). Processing unit 1010 is configured to, while outputting the voice reading, receive from a user a voice command requesting a document corresponding to a particular criteria (e.g., with voice command receiving unit 1014 through audio input unit 1004). Processing unit 1010 is configured to, in response to receiving from the user the voice command, identify one or more documents, of the plurality of documents, that correspond to the particular criteria (e.g., with identifying unit 1016); and output a voice reading of at least a portion of a respective document of the one or more identified documents (e.g., with outputting unit 1012 through audio output unit 1006).

[0167] In some embodiments, the particular criteria require that the one or more identified documents be authored by one or more authors identified by the user.

[0168] In some embodiments, the particular criteria require that the one or more identified documents be associated with a particular document.

[0169] In some embodiments, the particular criteria require that the one or more identified documents be replies to a particular document.

[0170] In some embodiments, the particular criteria require that the one or more identified documents include a last message from a respective author.

[0171] In some embodiments, the particular criteria require that the one or more identified documents correspond to a particular date range identified by the user.

[0172] In some embodiments, processing unit 1010 is configured to output audible information indicating a number of the one or more identified documents (e.g., with outputting unit 1012 through audio output unit 1006).

[0173] In some embodiments, processing unit 1010 is configured to output audible information indicating that the respective document is a last document of the one or more identified documents (e.g., with outputting unit 1012 through audio output unit 1006).

[0174] The foregoing description, for purpose of explanation, has been described with reference to specific embodiments. However, the illustrative discussions above are not intended to be exhaustive or to limit the invention to the precise forms disclosed. Many modifications and variations are possible in view of the above teachings. The embodiments were chosen and described in order to best explain the principles of the invention and its practical applications, to thereby enable others skilled in the art to best utilize the invention and various embodiments with various modifications as are suited to the particular use contemplated.

[0175] For example, one or more aspects of the operations described with respect to FIG. 6 may be used with operations described with respect to FIGS. 7 and 8 (e.g., outputting an audible inquiry after reaching an end of a document). Similarly, one or more aspects of the operations described with respect to FIG. 7 may be used with operations described with respect to FIGS. 6 and 8, and one or more aspects of the operations described with respect to FIG. 8 may be used with operations described with respect to FIGS. 6 and 7. For brevity, these details are not repeated.