Television/Telephone System With Automatic Dialing

This application is related to the following applications which are assigned to the assignee of the present application: Ser. No. 109,424, filed Jan. 2, 1980, entitled "Television Receiver With Two-Way Telephone Conversation Capability", in the name of Paul Snopko, now U.S. Pat. No. 4,338,492; Ser. No. 175,456, filed Aug. 5, 1980, entitled "Television Receiver With Two-Way Telephone Conversation and Dial-Out Capabilities", in the name of Paul Snopko, now U.S. Pat. No. 4,349,701; Ser. No. 260,639, filed May 4, 1981, entitled "Character Generator with Latched Outputs" in the names of Jeffery Puskas, Peter C. Skerlos and Thomas J. Zato, now U.S. Pat. No. 4,419,662; and Ser. No. 243,010, filed Mar. 12, 1981, entitled "Microcomputer-Controlled Television/Telephone System and Method Therefor", in the names of Peter C. Skerlos, et al, now U.S. Pat. No. 4,356,509.

This invention relates generally to a system and method for communicating by telephone using a conventional television receiver, and more particularly relates to a system and method for remotely initiating the automatic dialing of a predetermined number in placing a telephone call by means of a conventional television receiver.

The conventional telephone has been integrated, sometimes out of convenience and sometimes out of necessity, with various other systems to provide a more versatile communications device. For example, the telephone has been integrated with a highly sensitive microphone in combination with a loudspeaker. The high sensitivity microphone is capable of picking up audio signals in the vicinity of the telephone while the loudspeaker amplifies the incoming audio signals to permit remote audio communications via the telephone. These systems are generally referred to as "speaker" telephone systems.

The conventional telephone has also been integrated with a video display to form a video telephone capable of transmitting audio and video information between parties. These systems add considerable complexity to the conventional telephone link in that they require two high quality, wide band video transmission networks including two dedicated video cameras. The additional complexity and expense inherent in these systems has severely limited their widespread adoption and acceptance.

U.S. patent application Ser. No. 243,010, filed Mar. 12, 1981, referred to above, discloses a television receiver incorporating telephone interface circuitry permitting the viewer to not only answer incoming calls but also place outgoing calls by means of the television receiver's remote control system. A tuner-integrated microcomputer is used to drive a character generator in presenting the telephone number dialed on the television receiver's video display and to provide the touch tone dialed telephone number to a standard telephone line. A limited automatic re-dial feature is provided in that the last phone number dialed is temporarily stored in the microcomputer's memory and recalled therefrom by means of a single button selection for re-dialing the immediately preceding dialed number which was busy or went unanswered.

The desirability of providing rapid access to a plurality of called locations at the other end of the telephone line is, of course, obvious. This feature not only makes telephone usage more convenient, but also may become a necessity in times of stress such as in placing an emergency call to a physician, the police department or the fire department. In addition, a speed call capability is highly desirable for facilitating telephone usage by the handicapped. Finally, this type of feature would also be very useful in initiating calls to a frequently used number, such as that of a business, relative, or friend. Such systems ideally should permit the user to initiate the automatic dialing of a selected number by means of a simple and reliable procedure. The user should also be able to easily program or store such numbers simply and economically with a minimum of difficulty.

U.S. Pat. No. 4,283,845 to Feinberg et al., discloses a repertory dialer having first and second control means for respectively storing in a memory a plurality of digits indicative of a telephone number and for selectively recalling these digits from memory and providing them to a conventional telephone line. The single key operation in recalling a desired telephone number from memory provides a speed dialing capability in the system. U.S. Pat. No. 4,232,200 to Hestad et al., discloses a telephone repertory dial system including a signal processor and memory which obtains power under normal conditions from the telephone line or from batteries when the telephone is unplugged from the line. Isolation circuitry is included in the system for avoiding the loss from the volatile memory of the telephone numbers stored therein and power is provided to the unit in both the "on-hook" and "off-hook" conditions. U.S. Pat. No. 4,266,102 to Stanley et al., discloses an automatic telephone dialing system capable of reading a telephone number encoded on a business card or a credit card, storing the number in memory, and generating telephone output dialing pulses in accordance with the stored memory contents. In addition, a keyboard is also provided together with an associated memory, permitting two telephone numbers, one entered into the device via an encoded card and the other entered into the device via the keyboard, to be stored within the unit.

U.S. Pat. No. 4,298,775 to Buck et al., relates to a telephone set for use in a telephone network with a switch gear connected to incoming telephone lines and to a plurality of individual telephone stations to establish communication between selected stations and/or incoming telephone lines. The switch gear includes a memory and the capability of receiving command signals from the telephone set, transmitting confirmation signals to a set, and performing selected functions in response to the command signals. A programmable microprocessor is included for automatically scanning the switches, detecting an actuated switch and generating a command signal corresponding to the selected function.

Although the above discussed telephone dialing systems facilitate user dialing of selected telephone numbers, these systems suffer from various limitations. For example, none offers a memory capable of retaining its contents when disconnected from the power source without the assistance of batteries. Also, none of the above discussed systems provides the user with information regarding the contents of each memory location. This information could be provided by means of a list located on or adjacent to the telephone unit, but such lists may become displaced or require frequent change as the memory is updated to accommodate new frequently dialed numbers.

Accordingly, it is an object of the present invention to provide an improved means and method for integrating a telephone in a television receiver.

It is another object of the present invention to provide a novel means and method for rapidly and automatically dialing a selected telephone number by means of the remote control system of a conventional television receiver.

Still another object of the present invention is to provide an improved telephone/television system with automatic dialing and stored telephone number re-programming capabilities.

A further object of the present invention is to provide an improved means and method for controlling an integrated television receiver-telephone system in which preferred telephone numbers may be automatically dialed in response to user inputs with the dialed number presented on the television receiver's video display.

A still further object of the present invention is to provide an improved means and method for storing in and recalling from a nonvolatile memory a plurality of predetermined telephone numbers under the control of a microcomputer and presenting the thus stored and recalled telephone numbers on a video display prior to transmitting a selected telephone number to a telephone line in initiating telephone communication.

The appended claims set forth those novel features believed characteristic of the invention. However, the invention itself as well as further objects and advantages thereof will be best be understood by reference to the following detailed description of a preferred embodiment taken in conjunction with the accompanying drawings, where like reference characters identify like elements throughout the various figures, in which:

FIG. 1 is a simplified block diagram of a television/telephone system with automatic dialing in accordance with the present invention;

FIG. 2 shows a remote control panel for use in the television/telephone system with automatic dialing illustrated in FIG. 1;

FIG. 3 is a combination block diagram and schematic diagram showing the television/telephone system of FIG. 1 in greater detail;

FIG. 4 shows a typical alpha-numeric display on the television receiver's video display in the automatic dialing mode prior to storing in or recalling from memory a predetermined telephone number;

FIG. 5 illustrates a typical video display presentation in the automatic dialing mode of operation showing the stored contents in one location of the nonvolatile memory;

FIG. 6 is a flow chart illustrating the sequence of operations implemented by the microcomputer in the television/telephone system of the present invention in controlling overall system operation;

FIG. 7 illustrates a flow chart representing the sequence of operations during the keyboard scan subroutine carried out by the microcomputer in the television/telephone system of the present invention;

FIG. 8 shows a flow chart illustrating the sequence of events carried out by the microcomputer in entering a selected telephone number via the remote control system in the present invention;

FIG. 9 illustrates the sequence of events as carried out by the microcomputer in the present invention for automatically dialing a stored telephone number and displaying the recalled and dialed number on the television receiver's video display;

FIG. 10 is a flow chart illustrating the sequence of events under the control of the microcomputer in programming the nonvolatile memory with a selected, user entered telephone number for later speed dialing recall; and

FIG. 11 is a flow chart showing the sequence of events under the control of the microcomputer wherein telephone number information stored in a nonvolatile memory is recalled therefrom and provided to the microcomputer for transmission to the telephone line.

Referring to FIG. 1, there is shown a simplified block diagram of a television/telephone system with automatic dialing 210 in accordance with the present invention. The system includes a remote signal detector/amplifier 214 responsive to remotely generated control signals from a remote control transmitting unit 136 under user control. The remote signals are preferably propagated in the infrared (IR) spectrum and contain the control information in the form of pulse code modulated variations in the propagated signals. The remote signal detector/amplifier 214 receives, amplifiers and provides a squared output control signal from the remote control transmitter 136 to a microcomputer 216. The squared output signal consists of pulses which contain serial data bits which are then decoded by microcomputer 216. The decoding process is accomplished by means of stored hardware logic within microcomputer 216 and is controlled by the microcomputer software program contained in its ROM (Read Only Memory). Microcomputer 216 provides appropriate outputs during the channel selection and tuning process to the television receiver's tuner circuitry 222 via an interface circuit 220. During automatic dialing, the microcomputer 216 provides appropriate outputs to a telephone line via a telephone interface circuit 230. Appropriately decoded outputs are also provided by microcomputer 216 to a nonvolatile MNOS memory 218 for future programming of the television receiver, e.g., favored channel tuning and automatic telephone number dialing.

Microcomputer also 216 provides appropriate digital outputs to a character generator 224 which is coupled to the remainder of the television receiver 226 which includes a video display 228. The character generator 224 provides the appropriate digital signals to the video display 228 for the presentation thereon of a dialed or programmed telephone number, as described below in greater detail. Similarly, the microcomputer 216 provides appropriate dialing signals to the telephone interface circuit 230 which, in turn, provides signals representing the dialed number to a conventional telephone line. Incoming signals from the telephone line are also provided via telephone interface circuit 230 to the remainder of the television receiver 226, i.e., the television receiver's audio system, for generating audio signals by the speaker system of the television receiver. Various information is provided from the various systems in the television receiver 226 via the television tuner interface circuit 220 to the microcomputer 216 for optimum television receiver performance. This feedback information may include such things as synchronization signal information, automatic frequency control (AFC) information, etc. The tuner primarily provides intermediate frequency (IF) signal information to the remaining portions of the television receiver 226. The television/telephone system shown in FIG. 1 is capable of operating either in a television mode of operation or a telephone mode of operation as selected by a viewer/user. In addition, in the telephone mode of operation the present invention is capable of operating either in an incoming call receive mode, an outgoing call transmit mode, or an automatic dial mode including the programming of a selected telephone number in a memory unit and the recalling therefrom of that telephone number as desired. The television and incoming telephone call receipt modes of operation are described in the above-referenced patent application entitled "Microcomputer-Controlled Television/Telephone System and Method Therefor" the disclosure of which is hereby incorporated by reference in the present application. The present invention relates to the automatic dial mode of operation of the television/telephone system shown in FIG. 1 and it is this feature which is described in detail in the following paragraphs.

Referring to FIG. 2, there is shown a remote controller 136 for generating the control signals utilized in the present invention. The remote control transmitter 136 shown in FIG. 2 is of conventional electronics design and includes, generally, IR emitting diodes, an integrated circuit, a transistor, an oscillator adjustment potentiometer, a matrix keyboard, and a low voltage DC potential source. The electronic configuration and operation of the remote control unit 136 will not be further discussed as it does not form a part of the present invention, however, the various control signals generated by this remote control transmitting unit are described in the following paragraphs.

A sixty-four level volume control includes volume up and volume down controls 240A, 240B. These controls are used to regulate the volume of the television receiver in the television mode of operation and the telephone output to the television receiver's speaker in the telephone mode of operation to the desired level. OFF/ON control 238 provides OFF and ON control of the television receiver in the television mode of operation while a channel selector including channel up and channel down controls 242A, 242B permits programmed channel scanning selection during the television mode of operation. Direct access selection is accomplished by means of desired channel number selection on the alpha-numeric keyboard arrangement 244 followed by selection of the ENTER/RECALL control 246 within a predetermined time period following channel number entry. Receipt of an incoming telephone call is initiated by engagement of the telephone mode selector 250 which permits the television receiver to operate as a speaker phone with a microphone 31 in the television receiver responsive to audio inputs and the television receiver's speaker providing audio outputs to the viewer/user of the television/telephone system of the present invention. An AUTO OFF control 248A and an AUTO ON control 248B are utilized in the automatic programming of the television receiver to initiate automatic turn on or turn off at a predetermined time in accordance with information stored in a random access memory (RAM) described below. A TV MUTE/PRIVACY control 252 permits the audio output of the television receiver to be muted when in the television mode of operation and the microphone on the television receiver to be disabled in order to temporarily terminate outgoing audio communication when in the telephone mode of operation. Again, these features and the operation of such a system are described in the aforementioned patent application entitled "Microcomputer-Controlled Television/Telephone System and Method Therefor".

Shown on the lower portion of the remote controller 136 of FIG. 2 are a series of instructions 256 in pictorial form representing several series of sequential operations required for operating the television/telephone system of the present invention in the various telephone modes available. For example, in the direct dial operation the TELEPHONE MODE selector 250 is first selected, followed by entry of the digits of the desired telephone number on keyboard 244. Next is shown the re-dial operation procedure involving the initial selection of the TELEPHONE MODE selector 250 followed by selection of the ENTER/RECALL key 246 within a predetermined period thereafter. Next is shown the automatic dial programming sequence while in the television mode of operation wherein a desired number is stored in memory for later recall. This sequence involves first selecting the automatic dial selector 254, followed by selection of a digit, or digits, representing the location in memory where the desired number is to be stored. In the embodiment of the present invention described herein, two memory locations for storing telephone numbers are available and hence the digits 1 or 2 representing these locations may be entered at this time. The present invention is certainly not limited to the storage of merely two desired telephone numbers, as this is a function only of the size, or capacity, of the programmable memory. Following the designation of the memory location in which the desired number is to be stored, the digits of the desired telephone number are then entered via keyboard 244, followed by selectin of the ENTER/RECALL key 246. Next is shown the sequence of the automatic dial-out operation involving the initial selection of the TELEPHONE MODE selector 250 followed by the selection of the automatic dial selector 254. The memory location from which the desired number is to be removed is then entered by means of keyboard 244, followed by selection of the ENTER/RECALL key 246 which initiates the transmission of appropriate signals from the television/telephone system 210 to the telephone line for initiating and completing the telephone call. This sequence of operations permits the user to alternately select and view the telephone number to be dialed prior to the activation of the ENTER/RECALL key 246.

Referring to FIG. 3, there is shown partially in block diagram form and partially in schematic diagram form a television/telephone system 210 in accordance with a preferred embodiment of the present invention. A remote control transmitting unit 136 provides a pulse code modulated command signal to infrared (IR) emitting diodes 62. In the preferred embodiment of the present invention, three IR emitting diodes are utilized to provide large amplitude signals having unique pulse code modulation formats. The coded IR signals thus produced are transmitted to and received by a photosensitive diode 64 connected to a conventional IR signal detector/amplifier 22. The squared output signal consists of the pulses which contain the serial data bits. These pulses are then transferred through a connector (not shown) to an RC noise filter comprised of a resistor 66 and a grounded capacitor 68 and then to microcomputer 216 for decoding. The decoding process is implemented by special hardware logic in microcomputer 216 and is controlled by the microcomputer software program contained in its ROM (Read Only Memory) 84.

Microcomputer 216 is a four bit, E/D MOS integrated circuit with a ROM 84, a RAM 86, a central processing unit (CPU) 74, an input counter 70, a program counter 82, and various other circuitry (not shown) typically incorporated in the conventional microcomputer. The microcomputer 216 stores instructions and data, periodically updates the stored data, compares both stored and real-time data and makes decisions based upon these comparisons by means of logic instructions in providing system control. The ROM 84 is a mask-generated, nonvolatile, 4,096.times.8 bit memory matrix which includes 4,096 memory locations or "bytes" of 8 bits each. Program instructions and data are stored in ROM 84 which has a seventy-nine instruction capacity. 8-bit binary patterns are used by ROM 84 from which instructions and data are sequentially removed under the control of the program counter 82 in reading out each instruction to be executed for carrying out program functions. RAM 86 has an X-register, Y-register, memory matrix organization for temporary memory storage of 256 words of 4 bits each. Each bit may be used as a flag to indicate whether a particular event has occurred or the individual flags can be used in combination in the form of a counter. When instructed, the contents of a directly addressed location in RAM 86 are transferred to accumulator 78 and the reverse process may also be accomplished by means of the proper instruction from ROM 84. RAM 86 organization may be broken up into a lower RAM map and an upper RAM map. The lower RAM map which is shown in Table I provides control of television receiver tuning, video display presentation and other functions related to television receiver operation. The upper RAM map which is shown in Table II is primarily involved with the automatic dial-out operation, the display of a dialed telephone number, and the timing involved in the AUTO-ON and AUTO-OFF operation of the television receiver which does not form a part of the present invention.

RAM memory locations are designated by M(X,Y) terminology with words expressed generally in hexadecimal code. For example, the received channel designation is located in the M(0,7) location (units) and the M(0,6) location (tens) of the lower RAM map as shown in Table I. Similarly, referring to Table II, the memory locations in the upper RAM map for the storage in and recall from first and second telephone numbers for automatic dialing are from the M(10,0) location to the M(10,12) location for the first telephone number and from the M(11,0) location to the M(11,12) location for the second telephone number stored in RAM 86. X Y 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Y X 7 1 Rmt Rmt Rmt Rmt Rmt Rmt < REMOTE > TEMP < Key In Data > On 1 7 2 Timing Low Low Erase Flag Pulse Current Code STORAGE POWER Set Every 2 4 Counter Counter Counter Seq. LSD MSD MSD LSD Key 20 .mu.s 4 8 2 1 2 1 8 6 1 -- CRT AUTO ADDRESS < PREFERRED CH MNOS WRITE FLAG > 1 6 2 DIAL CALCULATION X-Adr Y0Adr TEL 2 4 NO. BUFFER WRT 4 8 < MNOS > Flag 8 5 1 54 50 46 42 38 34 30 26 22 18 14 80 76 72 68 64 1 5 2 55 51 47 43 39 35 31 27 23 19 15 81 77 73 69 65 2 4 56 52 48 44 40 36 32 28 24 20 16 82 78 74 70 66 4 8 57 53 49 45 41 37 33 29 25 21 17 83 79 75 71 67 8 4 1 60 56 51 48 44 40 36 32 28 24 20 16 12 8 4 0 1 4 2 61 57 53 49 45 41 37 33 29 25 21 17 13 9 5 1 2 4 62 58 54 50 46 42 38 34 30 26 22 18 14 10 6 2 4 8 63 59 55 51 47 43 39 35 31 27 23 19 15 11 7 3 8 3 1 PLL KEY SD/P KEY MUT < VOLUME > 45 s 1 3 2 Sel JOB DISP TEL C H. CHANGE 10's 1's PO TEN RASTER 30 s KEY 2 4 (2nd) FLAG MODE BIT DISP. KEY COUNTER 2255 .multidot. 125 250 .multidot. 625 50.multidot.125 ON 4 8 SKIP KEY ON COUNTER .mu.s .mu.s .mu.s Counter 8 2 1 PLL INIT RECALL TEL TEL TEL < NOW TIME > SW JOB ROOT -- Tel 1 2 2 SEL I.D. FLASH DIAL I.D. PULSE CLK. INT 1/5, 1/4 .1 s 1 s 10 s 50/60 PR Scan Flag -- Input 2 4 (LSD) or D. FLAG DIGIT or D. COUNT Select PR CAK -- Digit 4 8 FLAG COUNT TIMER CLK. STRB 1 Sec Count 8 1 1 PLL PLL PLL ON MUT -- Disc 1 AFC AFC AFC AFC AFC AFC 1 1 2 REF REF REF MNOS MNOS OFF MUT -- Input HI LO OK Step Timer Timer Timer Timer 2 4 (2ND) MAX MIN E/W E/W RDY MUT -- Count Count Flag Count Count Flag 2 1 4 8 Flag Count -- 8 0 1 PLL A ON A OFF -- RCV CH DISP CH UHF CH/CLK 1 0 2 REF TEMP BURST TEMP BURST SW SW -- < TEMP > Super MOD 2 4 (LSD) MOM. MOM. Bounce Buffer -- 1's 10's 1's 10's Mid PWC/CATY 4 8 Hi VHF AF/PLL 8 X Y 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Y X X Y 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Y X 15 1 15 Sec 15.3 s 5.1 s .32 5.2 s 5.1 s .32 1 15 2 TEL TEL TEL TEL TEL TEL TEL 2 4 AOFF AOFF AOFF AOFF REDIAL REDIAL REDIAL 3 8 FLAG TIMER TIMER TIMER FLAG TIMER TIMER 8 14 1 PM/AM 1 14 2 < A ON + 1 > 2 4 1 M 10 M Hr 4 8 8 13 1 82 78 74 70 66 62 58 1 13 2 83 79 75 71 67 63 59 2 4 80 76 72 68 64 60 4 8 81 77 73 69 65 61 8 12 1 132 128 124 120 116 112 108 104 100 96 92 88 84 1 12 2 133 129 125 121 117 113 109 105 101 97 93 89 85 2 4 134 130 126 122 118 114 110 106 102 98 94 90 86 4 8 135 131 127 123 119 115 111 107 103 99 95 91 87 8 11 1 13th 12th 11th 10th 9th 8th 7th 6th 5th 4th 3rd 2nd 1st 1 11 2 TEL TEL 2 4 DIGIT DIGIT 4 8 < AUTO DIAL #2 > 8 10 1 13th 12th 11th 10th 9th 8th 7th 6th 5th 4th 3rd 2nd 1st 1 10 2 TEL TEL 2 4 DIGIT DIGIT 4 8 < AUTO DIAL #1 > 8 9 1 INIT 13th 12th 11th 10th 9th 8th 7th 6th 5th 4th 3rd 2nd 1st 1 9 2 TEL TEL TEL 2 4 REDIAL DIGIT DIGIT 4 8 FLAG < LAST NUMBER > 8 8 1 A ON PM/AM PM/AM PM/AM 1 9 2 AOFF < NOW TIME > < AUTO OFF > RUNTAIG < ADN > RUNTAIG 2 4 FLAG M 10 M HR M 10 M HR < M 10 M HR > 4 8 PWR FAIL SET/MUT SET/MUT 8 X Y 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Y X

When a telephone number is selected for automatic programming it is immediately stored in the appropriate RAM location for later transfer to the MNOS memory 218 for nonvolatile storage therein and recall therefrom. As shown in Table II, the upper RAM map provides a memory capacity for storing two programmed telephone numbers for automatic dialing, each containing up to thirteen digits. The present invention is not limited to the storage and recall of only two telephone numbers, since this system parameter is a function only of memory size and the general configuration and operation of the system described and claimed herein is compatible with the storage and recall of virtually any desired number of telephone numbers. RAM memory locations M(0,0), M(0,1), M(0,2) and M(0,3) form a scratch pad memory in RAM 86 for the temporary storage of digitally coded signals representing various operating parameters. These scratch pad memory locations and the temporary storage capability they provide reduce memory location addressing steps in the operation of microcomputer 216 which is described in detail below.

Information stored in RAM 86, which is a volatile memory, is lost when the receiver is turned off. However, information stored in ROM 84 is not lost either when the television receiver is turned off or when power is removed from the television /telephone system 210. When the television receiver is again turned on, the microcomputer program initializes RAM data from ROM 84 which causes the binary signals representing the first instructions stored in ROM 84 to be coupled to the CPU 74 and causes various other portions of the microcomputer 216 to be initialized for proper future operation when power is applied to the microcomputer. For example, when the television receiver is turned on the program counter (PC) 82 is initialized by means of a RESTART signal. Thus, the program proceeds to the initial instruction of the routine in ROM 84 and provides this instruction to CPU 74.

CPU 74 includes an instruction decoder (ID) 76, an accumulator (ACC) 78, and an arithmetic and logic unit (ALU) 80. Instruction decoder 76 receives instructions from ROM 84 provided to CPU 74 and analyzes their contents, initiates ALU and ACC operations, and provides a control signal to the program counter 82 which, in turn, directs the program to proceed to the next designated instruction in ROM 84. It is by means of this closed-loop instruction control system that ROM 84 provides the various control instructions to CPU 74 in carrying out the program stored in ROM 84. Accumulator 78 is a 4-bit register and is the primary working register of microcomputer 216. The contents of accumulator 78 derived from RAM 86 or earlier from ROM 84 are compared with the instructional data of ROM 84 and ALU 80 with the results of these comparators being stored in control bit locations in RAM 86. ALU 80 receives binary control signals from instruction decoder 76 and performs the required arithmetic and logic operations including addition, increment, Boolean logic operations, straight transfer, etc.

Input counter 70 in microcomputer 216 is connected to the filter network comprised of resistor 66 and grounded capacitor 68 to receive the pulse coded input command signals from remote control unit 136. Input voltages V.sub.P of +5 VDC and V.sub.G of +8 VDC are provided for energizing microcomputer 216. Input counter 70 performs as a binary series of flip-flops to permit gated counting of input pulses interrupted by periodic analysis of these input pulses with the subsequent contents of input counter 70 being provided to accumulator 78 in CPU 74. The counted pulses are then compared in ALU 80 with stored pulse counts in RAM 86 and preset data in ROM 84. Based upon this comparison logic analysis command signals are provided by means of instruction decoder 76 in CPU 74 to program counter 82 in directing the program to desired instruction locations generator 224. Also as a result of the comparisons and decisions made by ALU 80, data is transmitted from CPU 74 to RAM 86 where it is stored for further comparison with subsequent outputs from input counter 70. During this process ALU 80 is controlled by inputs from instruction decoder 76 which, in turn, is driven by various commands provided by ROM 84. This process is continued until all digits of the pulse coded telephone number transmitted by remote control unit 136 are received and stored in the designated control and display memory locations in RAM 86.

Microcomputer timing is provided by a series resonant device 72 both sides of which are connected to microcomputer 216 because of the high operating frequency of oscillator 72, i.e., 7.16 MHz. This permits most of the master clocking circuitry to be incorporated within the microcomputer 216 on a single "chip". One output of series resonant device 72 is coupled to the input of clock generator 88 with the other output of series resonant device 72 coupled to the output of clock generator 88. After processing, these clock pulses are provided to central processing unit 74 and to input counter 70 in its role of counting input pulses and detecting remotely generated control commands.

Also incorporated in the microcomputer 216 are portions of a phase lock loop (PLL) comprised of 12-bit reference counter 90, 11-bit programmable counter 94, phase detector 92, low pass filter 96, tuner/local oscillator 98, and prescaler 100 together with associated circuitry. In the present invention, indirect frequency synthesis is utilized in a conventional manner in which a PLL utilizes the tuner/local oscillator 98 as its voltage controlled oscillator (VCO). In the PLL, the master timing control frequency of series resonant device 72 is divided by a multi-stage divider network, the programmable 12-bit reference counter 90, to provide a divided-down signal to phase comparator 92. The other input to phase comparator 92 is provided by the local oscillator of tuner 98. The frequency division chain from the local oscillator in tuner 98 to phase comparator 92 consists of a fixed divide by 256 prescaler 100 and a multi-stage 11-bit programmable divider or counter 94. The programmable portion of counter 94 divides by the numerical value of the frequency of the local oscillator in megahertz for the channel selected. The output of reference counter 90 provides a second input to phase comparator 92.

When the signal from programmable counter 94 and the signal from reference counter 90 to phase comparator 92 are exactly equal, the comparator output is 0. When there is any difference in these two frequencies, phase comparator 92 will develop an output which, when passed through low pass filter (LPF) 96, provides a correction voltage until the two signals have exactly the same frequency. The tuner local oscillator 98 then assumes the stability of series resonant device 72 and an oscillator signal is provided via line 99 to appropriate signal receiving circuitry (not shown) in the television receiver. This frequency comparison is done continually in order to compensate for turner oscillator drift. The output of phase comparator 92 is a series of pulses the duty cycle of which is dependent on the difference between the reference frequency and the divided-down local oscillator frequency. LPF 96 provides adequate filtering of the frequency correction signals so that there is no perturbation on the tuning line while allowing for a quick response to a new tuning voltage.

Digital-to-analog converter (DAC) 106 is driven by the output of resonant device 72 and is modulated by a control signal from CPU 74. The control signal from CPU 74 provides for the pulse width modulation (PWM) of the output of DAC 106. The duty cycle of the output of DAC 106 is thus controlled internally by the program stored in ROM 84 to provide a PWM output signal for volume control of the television receiver in the television mode of operation and the telephone speaker 33 in the telephone mode of operation. The PWM signals from DAC 106 are provided to output latches 102 and thence to LPF 108 where this digital signal is integrated to provide a DC analog output signal for driving conventional volume control circuitry (not shown).

Additional tuning outputs are provided from RAM control memory locations to output latches 102 to provide proper band switching signals to the television receiver interface circuit 220. These band switching signals are then provided via lines 101 to various voltage responsive, variable resonant frequency circuit elements (not shown) in the television receiver. This permits the television receiver in the television mode of operation to tune to the proper band, e.g., VHF, UHF, CATV, or Superband, depending upon the channel number selected. In addition, automatic frequency control (AFC) and vertical synchronization information are provided to input latches 104 for television signal acquisition and tuning by means of tuning process steps stored in ROM 84 for controlling tuner 98.

When a desired telephone number is entered on the keyboard 244 of remote control unit 136, the pulsed output of input counter 70 is provided to instruction decoder 76 in CPU 74. These received pulses are then temporarily stored in accumulator 78 and later compared in ALU 80 with program data recalled from ROM 84. When command inputs are received and verified by the program in the microcomputer 216 as being valid commands, the individual commands, following program analysis in ALU 80, are stored in selected memory locations in RAM 86. This is a sequential process for as subsequent commands are detected by input counter 70 they are similarly stored in appropriate memory locations in RAM 86 until an entire legal code is detected by CPU 74 which sets a flag in a predetermined memory site in RAM 86. When the program later detects this flag in RAM 86 the stored command code is read from RAM 86 and provided to ALU 80 and to accumulator 78 from which it is transmitted to output latches 102. Thus, when a valid telephone command and telephone number dialing sequence is received by input counter 70 these command signals are eventually provided to output latches 102.

Output latches 102 of microcomputer 216 provides several outputs to character generator 224 including program control and alpha-numeric character display information. Any of the more conventional character generators may be used in the present invention as the particular design and operation of character generator 224 does not form a part of the present invention. In the preferred embodiment of the present invention, character generator 28 is an N-channel, LOCOS, E/D MOS integrated circuit which is capable of providing a 60 character display having 5 rows of 12 characters each to video display 228. A video display character generator program is stored in a ROM (not shown) in character generator 224 which controls the processing of digital signals therein in accessing the 66 RAM words stored in available RAM (not shown) memory locations. The character generator 224 utilized in a preferred embodiment of the present invention is described in co-pending patent application Ser. No. 260,639, filed 5/4/81, entitled "Character Generator with Latched Outputs", in the names of Jeffery Puskas, Peter C. Skerlos and Thomas J. Zato, the detailed description of which is hereby incorporated by reference in the present application.

The information presented on the video display 228 in response to inputs from the character generator 224 will now be described with reference to FIGS. 4 and 5. For programming a telephone number in memory, the AUTODIAL key 254 is initially selected and display information as shown in FIG. 4 is presented. The top, or second, line of the display includes the words AUTODIAL, indicating the mode of operation the television/telephone system 210 presently is in, while the bottom, or first, line of the display contains the user instruction PRESS 1 OR 2. This instruction refers to MNOS memory locations 1 and 2 as shown in Table III for accessing and storage of the telephone number in one of these memory locations. These memory locations may be accessed by selecting the corresponding number on the alpha-numeric keyboard 244. This is then followed by entry of the telephone number to be stored on the alpha-numeric keyboard 244 with the characters sequentially moved from right to left and from a lower to an upper line once the immediately lower line is filled with characters. This is shown in FIG. 5 which illustrates the general form the display takes following the selection of an alpha-numeric key representing one of the memory locations in which a telephone number may be stored for later recall and the entry of the desired telephone number.

As the telephone number is entered by means of the remote controller 136, the selected alphanumeric characters appear on the video display 228 while being stored in the microcomputer's RAM 86. When the entry of the desired telephone number in RAM 86 is complete, the selection of the ENTER/RECALL key 246 causes the alpha-numeric characters to be removed from the video display 228 and the contents of RAM 86 representing the entered telephone number to be transferred to MNOS memory 218 for storage therein and subsequent recall.

In the automatic dialing procedure, the TELEPHONE MODE selector 250 is initially selected which results in the presentation as shown in FIG. 4 appearing on the video display after the AUTODIAL key 254 is selected. The alpha-numeric key representing the MNOS memory location in which the desired telephone number is stored is then selected resulting in a video display presentation of the contents thereof, as shown in FIG. 5. Selection of the ENTER/RECALL key 246 results in the transmission of signals representing the stored telephone number to the telephone line for initiating the telephone call and the removal of the alpha-numeric characters from the video display 228. During telephone number dialing, the speaker 33 is muted in response to an output signal provided by microcomputer 216 via the character generator 224 to the telephone interface circuit 230 to undesirable audio clicks due to the opening and closing of relay 36 from being heard over the television receiver's speaker 33.

When a 7-digit phone number is dialed, it is displayed in one row near the bottom of video display 228. The number is preceded by the letters TEL as shown in FIG. 5. Area codes when dialed for long distance calls are first displayed in row one but are subsequently moved up to the second row after the entry of the telephone number. These digits are preceded by the letters AC. For overseas calls up to 13 digits can be displayed on the video display 228. If more than 13 digits are required, all digits will be dialed but only the last 13 will be displayed on video display 228. The phone number display can be removed from the screen by either waiting for a 30 second time out period programmed into microcomputer 216 or by depressing the ENTER/RECALL key 246 twice on the remote control transmitter 136. The present invention is not limited to the presentation of a dialed telephone number or time and channel number on a CRT-type of video display. Such information could equally as well be displayed on a great variety of displays, e.g., a light emitting diode (LED) display which presently is commonly used to display a channel number. State of the art techniques could as easily permit the display of a dialed telephone number on an LED display. Driving an LED display directly by means of a microcomputer is presently well known in the art and in such a configuration character generator 224 would not be needed. Microcomputer 216 could directly drive a standard LED display or any number of other standard display devices.

RAM location (3,12) in the lower RAM map shown in Table I contains the telephone control bit. Bit one of this RAM data word is designated SD/P and controls a privacy mode whereby the microphone 31 on the television receiver is muted so that the other telephone subscriber is unable to hear conversations in the vicinity of the television/telephone system 210. Bit 2 of this RAM data word is designated TEL and controls mode selection from telephone to television operation and vice versa. When the telephone mode selector 250 is selected, bit 2 of lower RAM memory location (3,12) is toggled. This change of state is read from RAM 86 and provided to the appropriate RAM address in character generator 224. Character generator 224, in turn, reads this RAM memory location and provides the appropriate output to telephone interface circuit 230. This output is designated "Telephone" in FIG. 3. Similarly, a "privacy" signal is provided to processing circuitry 34 in telephone interface circuit 230 when the MUTE/PRIVACY mode selector 252 is selected on remote control unit 136. If the MUTE/PRIVACY mode selector 252 is selected while in the television mode of operation the audio output from the television receiver is muted.

The character generator 224 provides two outputs to video display 228, a character output drive pulse and a background output drive pulse. Various inputs are provided to character generator 28 which are not shown in FIG. 3 such as horizontal and vertical synchronizing pulses in carrying out conventional "bookkeeping" functions in driving video display 228.

The MNOS (metal-nitride-oxide-semiconductor) memory 218 is of conventional design and may employ any of the more conventional memory IC's. A plurality of lines couple the MNOS memory 218 with the output latches 102 of microcomputer 216. Operating mode data is latched at the input negative edge of a "chip enable" pulse provided from microcomputer 216 to the MNOS memory 218 on line 73. Data provided from microcomputer 216 to the MNOS memory is then latched or a new mode of operation, e.g., television or telephone mode, is then initiated corresponding to the mode of operation at the positive edge of the "chip enable" pulse. Data is provided from microcomputer 216 via lines 75, 77 and 79 to the MNOS memory 218 for storage and subsequent recall. This data is initially stored in the microcomputer's RAM 86 following receipt of the remotely generated control signals from the remote control transmitting unit 136. This data is then read out from RAM 86 under the control of the microcomputer's CPU 74 and provided via the aforementioned lines to the MNOS memory 218. When a number is selected for automatic dialing, the appropriate memory location in MNOS memory 218 is addressed by means of microcomputer 216, the appropriate digital data is read therefrom by the microcomputer, and this data is then provided via the microcomputer's RAM 86 and output latches 102 to the character generator 224 which provides the appropriately coded signal information to the telephone interface circuit 230. The data corresponding to the alphanumeric characters of the selected telephone number is then provided to the telephone line via the isolation relay 36 and the isolation transformer 37. The leading and trailing edges of the "chip enable" pulse provided via line 73 to the MNOS memory 218 controls the reading and writing of information in the MNOS memory, or the direction in which data is transferred on lines 75, 77 and 79.

The MNOS memory 218 includes a 16.times.16 memory cell array for storing channel and telephone number information. As shown in the MNOS map of Table III, channel number information is stored in the first eight columns and four rows of the MNOS cell memory array. Similarly, columns 8-11 and rows 0-3 are reserved for storing the alpha-numeric characters of a first telephone number for automatic dialing. Columns 12-15 and rows 0-3 are similarly utilized for storing a second telephone number for automatic dialing purposes. When the input mode is latched in the MNOS memory via line 73, a latched group counter (not shown) is specified by the data of lines 75, 77 and 79. When the address data is latched, MNOS memory data of the specified address is provided to the appropriate terminals of the memory cell array. A latch group counter is automatically incremented during data input to the MNOS memory. Read and write modes of the MNOS memory 218 are controlled by the leading and trailing edges of the "chip enable" signal provided thereto via line 73. Data is removed from the memory cell array in response to the receipt of the appropriate edge of the "chip enable" signal and data is read out of the MNOS memory and provided to the microcomputer 216 in a conventional manner. An MNOS memory IC utilized in a preferred embodiment of the present invention is described in a document entitled "MN1208, MN1218-PROM/256-Bit MNOS Electrically Programmable Nonvolatile Memory", published by Panasonic Company.

The manner in which digital signals are processed in the television/telephone system 210 in automatically providing a predetermined telephone number to the telephone line and displaying the automatically dialed telephone number on the video display 228 of a television receiver will now be explained with reference to the flow charts shown in FIGS. 6-11. In referring to FIGS. 6-11 an oval symbol indicates the start of an operational sequence, a diamond symbol indicates a decision point based upon the comparison of binary signal inputs, and a rectangle indicates an instruction or a set of instructions resulting in the performance of a control function. The computer listing for the automatic telephone number dialing sequence shown in FIGS. 6-11 is presented in Table IV. Included in this program assembly listing, processing from left to right and arranged in columns, or fields, is such information as read only memory (ROM) addresses in microcomputer 216 ranging from 000 to FFF, object code for instructions stored in the microcomputer's ROM, source statement number, subroutine instructions in mnemonic form, and various descriptive labels of the operands in the program including, lastly, a comment describing in plain English program operation. In referring to FIGS. 6-11, the ROM addresses of various operational steps in the program depicted therein are included immediately to the left of a designated operation. Detailed information on the symbology utilized in Table IV may be found in the publication "4-bit One Chip Microcomputer MN1400 Series", published by Matsushita Electronics Corporation. This publication also includes detailed information regarding the operation and configuration of the microcomputer chip utilized in a preferred embodiment of the present invention. However, the present invention is not limited to the use of a particular microcomputer but is compatible with any of the more conventional microcomputer chips currently available which could be integrated in the present invention with only minor modifications well known to those skilled in the relevant art.

Referring to FIG. 6, there is shown a general block diagram in the program implemented by the microcomputer 216 in carrying out the automatic telephone number dialing of the present invention. The program begins with an INITIALIZATION 81 routine in which the outputs of the system are initialized, the microcomputer's RAM is cleared, and various other routine housekeeping functions are performed. The INITIALIZATION 81 routine is accomplished when the television/telephone system is first connected to an AC source. The program then proceeds to an MNOS READ/WRITE routine 83 wherein the non-volatile MNOS memroy 218 exchanges stored data with the microcomputer 216. For example, following the initial plug-in of the television/telephone system 210 data will be read from the MNOS memory 218 and provided to the microcomputer's RAM 86. Similarly, in programming the MNOS memory, data is read from the microcomputer's RAM 86 and stored in the MNOS memory 218 for later recall in automatically dialing a stored telephone number. The program then proceeds to an OUTPUT REFRESH routine 84 where the various outputs of the microcomputer 216, such as to the character generator 224, for displaying the selected channel number, etc., are updated. The program then proceeds to a KEYBOARD SCAN routine 87 where a flag is set in the program indicating that the system is in the programming mode of operation and that a new telephone number is about to be stored in the MNOS memory 218. The programming mode is initiated upon the selection of the automatic dial selector 254 on the remote control transmitting unit 136, as described in detail below. Following selection of the automatic dial key 254, the program then initiates the display as shown in FIG. 4 on the video display 228 and awaits subsequent user entries. The program then proceeds to a TIMING routine 88 and branches back to the MNOS READ/WRITE routine 83. If the automatic dial key 254, the digits of the desired telephone number 244, and the ENTER/RECALL key 246 have been selected, the flag set in the microcomputer's RAM in response to the selection of the aforementioned keys is then detected in the MNOS READ/WRITE routine 83 and the user initiated inputs are then read from RAM 86 into the MNOS memory 218. If in the KEYBOARD SCAN routine 87, the program does not detect the selection of the automatic dial key 254, the program then proceeds to the TIMING routine 88 and branches back to the MNOS READ/WRITE routine 83 to continue previously initiated READ/WRITE operations, or simply transmits this routine if no operations are running.

One subroutine executed by the program in the KEYBOARD SCAN routine 87 of FIG. 6 is the TENKEY subroutine 92 as shown in FIG. 7. In general, this subroutine involves the control of the microcomputer's RAM 86 in accordance with the program stored in its ROM 84 in response to user inputs provided via the remote control transmitting unit 136. The TENKEY subroutine 92 involves various checks to determine if the digits entered in step 91 should be stored in the MNOS memory 218 as a valid telephone number. The first check involves an INFORMATION DISPLAY determination 93 wherein the program determines whether the information display of FIG. 4 is presented on the video display. If the system is in the information display mode as shown in FIG. 4, the program proceeds to the TEST step 104. If the system is not in the information display mode, the program proceeds to the TELEPHONE MODE CHECK 94 to determine if a telephone mode key 250 has been selected. If the telephone mode key 250 has not been selected the program proceeds to a TEST 1 step 109. If the telephone mode key 250 has been selected, the program proceeds to an ONSET KEY DETECT step 95 and if the selection of digits is detected, the program then exits this subroutine via an end step 103. If the selection of keys in step 95 is not detected, the program then proceeds to a AUTODIAL NUMBER DETECT step 96, and if the selection of a speed number corresponding to an MNOS memory location in which a selected telephone number is stored has been made, the program proceeds to the TEST step 104 where it determines whether the speed number selected is within the range of the MNOS memory locations in which predetermined telephone numbers are stored.

In the example of the present invention, only two MNOS memory locations, designated 1 and 2, are utilized so that the program first determines whether the AUTODIAL number selected is 0 or greater than 3 in steps 105, 106 and if the number thus detected is between 0 and 3, the program proceeds to a set TELEPHONE DISPLAY step 107 and initiates the display of new data on the video display as shown in FIG. 5. This new data is the valid telephone number recalled from the selected MNOS memory location. If the AUTODIAL number selected is not one in which a selected telephone number is stored, the program exits the TENKEY subroutine via an END step 103. After the video display is reprogrammed to present the telephone number thus recalled from the MNOS memory 218, the contents of the MNOS memory location in which the selected AUTODIAL number is stored are provided to RAM memory locations at rows 9 or 10, depending upon the automatic dial number stored at RAM memory location (6, 13), to permit the program to output the selected number from the microcomputer's RAM when the overall program returns to the OUTPUT REFRESH step 84 during the next cycle of the program. Thus, the TENKEY routine 92 primarily involves the detection of the telephone mode of operation and the recall from the MNOS memory of the stored telephone number and the reading out therefrom of that number and providing the stored telephone number to the microcomputer's RAM 86.

If the telephone mode of operation is not detected in step 94, the program proceeds to a TEST 1 109 subroutine where it checks to see if the system is in the telephone display mode 110. If the system is not in the telephone display mode of operation, the program proceeds to the TEN 03 step 111 for presenting channel and time display information on the video display in step 112.

If the selection of a AUTODIAL number is not detected in step 96 the program proceeds to a set TELEPHONE DISPLAY step 97 in preparation for programming the microcomputer's RAM. Similarly, if the telephone display mode of operation is detected in step 110, the program proceeds to a TEN 04 step 98 where the digits entered via the remote control transmitting unit 136 are sequentially provided to the microcomputer's RAM 86 for temporary storage therein prior to storage in the MNOS memory 218.

Following the TENKEY routine 92, the program next executes a REMOTE ENTER subroutine 113 which also is executed in the KEYBOARD SCAN routine 87 of FIG. 6. The REMOTE ENTER subroutine 113 is shown in FIG. 8 and in general involves the detection of the selection of the ENTER/RECALL key 246 on the remote control transmitting unit 136 and the setting of a new channel if in the television mode of operation or the storage of a new telephone number in the MNOS memory 218 if in the telephone mode of operation. The NEW CHANNEL set subroutine is shown generally to the left of the dotted line in FIG. 8, while the set MNOS memory subroutine is generally shown to the right of the vertical dotted line in FIG. 8.

Following detection of the selection of the remote ENTER/RECALL key 246, the program branches to the EN 01 subroutine 114. The program first checks to see if the TENKEY flag has been set in the microcomputer's RAM in step 115, and if this flag has been set, the program enters the digits of the selected new channel in the microcomputer's RAM in step 116. The television receiver is then tuned to the selected new channel. This is accomplished by the program proceeding from the KEYBOARD SCAN block 87 shown in FIG. 6 to the NEW CHANNEL block 90 prior to branching back to the MNOS READ/WRITE routine 83.

If the TENKEY routine is not detected in step 115, the program branches to the EN 20 subroutine 117 where the selected AUTODIAL number is read from RAM memory location (6, 13) and temporarily stored in RAM scratch pad memory location (0,2). The program next checks to see if a valid AUTODIAL number has been selected at step 118, and if a valid AUTODIAL number has been selected, the program sets a control flag designated SP in the RAM 86 and executes the SP instruction to determine if the system is in the telephone mode of operation at step 119. If in the telephone mode of operation, the program next proceeds to the EN 24 subroutine 120 and checks for the presence of the information display at step 121. If the information display is not present, the program branches to the EN 21 subroutine 122 and thence to BCAL TELTOG 123 for executing another subroutine in the overall automatic dial out program. If the information display is detected in step 121, the program branches to the EN 27 subroutine 124 for toggling the channel/time display and exiting the REMOTE ENTER routine 113 at the BCAL RED0 step 125.

If in step 119 the telephone mode of operation is not detected, the program branches to EN 26 at step 126 where a check is performed to see if the system is in the TELEPHONE DISPLAY mode 127. If not in the TELEPHONE DISPLAY mode, the program branches to EN 24 at step 120 and exits the REMOTE ENTER subroutine as previously described. If in the telephone display mode of operation, the program next sets MNOS E/W flags in RAM 86 in clearing the alphanumeric characters presented on the video display and initializing the MNOS write operation, A 0 is provided to RAM location (3, 13) which clears the display flag. A 0 is also provided to (3, 6) in RAM which clears the TENKEY flag and sends the telephone AUTODIAL number to a different RAM location for proper MNOS memory addressing. The program next detects the AUTODIAL number in step 129. If the AUTODIAL number is 1, the program sets a TELEPHONE WRITE flag at location (6, 8) in RAM and reads the contents of the AUTODIAL number in RAM into the Y=8 location in the MNOS memory. If in step 129 the AUTODIAL number 1 is not detected, then the AUTODIAL number must be 2 and the speed dial telephone number temporarily stored in RAM is read therefrom and provided to the Y=12 location in the MNOS memory. A 0 is provided to location (6,9) for initializing RAM 86. Similarly 0 is provided to the scratch pad register location (2,0) in RAM 86 for initializing the readout of RAM 86 to the MNOS memory 218. The aforementioned steps initialize the readout of the telephone number information in rows 10 or 11 of the upper RAM map of Table II and its transfer to the appropriate locations, either the AUTO DIAL 1 or the AUTO DIAL 2 positions, in the MNOS memory 218. The program then exits the REMOTE ENTER routine 113 and returns to the general automatic dial out program at the KEYBOARD SCAN portion 87 thereof as shown in FIG. 6.

The TELTOG routine 131 is shown in FIG. 9. This subroutine generally relates to the radial or automatic dial out of a predetermined, stored telephone number, the toggling of the video display to present channel and time information and the toggling of the video display to present a stored telephone number or channel and time information, in proceeding from left to right as illustrated in FIG. 9. The program initially checks to see if any telephone number digits have been selected at step 132 and if the answer is in the negative, the program proceeds to a REDIAL step 133 and determines whether the system is in the TELEPHONE mode of operation at step 134. If in the TELEPHONE MODE of operation, the program proceeds to determine whether or not a AUTODIAL NUMBER has been selected at step 135. If a telephone AUTODIAL number has been selected, the program proceeds to RED 1 at step 138 and reads the telephone AUTODIAL number from RAM location (0,2), adds 9 to that number and establishes the X address of the telephone number in RAM 86. The contents of the accumulator 78 in the microcomputer 216 are then provided to the X-register in RAM 86 which sets a flag in initializing the dial out operation. The program then proceeds to TELDIG step 139 in initiating the SET DIAL function 140 in which telephone dialing information is displayed on the video display in steps 141 and 142 followed by the blanking of the video display in step 143. Following the display of the AUTODIAL number, the program exits this subroutine and returns to the general automatic dialing program at step 144.

If prior to entering the TELTOG routine 131, telephone digits had been entered, the program proceeds to TOG 1 at step 150 where the program checks to see if the system is still in the TELEPHONE DISPLAY mode of operation at step 151. If the system is still in the TELEPHONE DISPLAY mode of operation, the program sets the channel and time display at step 152. If the system is no longer in the TELEPHONE DISPLAY mode of operation at step 151, the program branches to the SET CHANNEL AND TIME DISPLAY subroutine at step 153 followed by the SET NO DISPLAY subroutine at step 154. If the system is not in the CHANNEL AND TIME DISPLAY mode as detected at step 153, the program branches to the SET TELEPHONE DISPLAY at step 155 for displaying the selected telephone number. Thus, each time after the selection of the remote ENTER/RECALL key 246, the program proceeds in a circular manner from the telephone display mode to the channel and time display mode to a no display status and then back to the telephone display mode.

Referring to FIG. 10, there is shown the program operation for the transfer of a telephone number from RAM locations (10,0) through (10,12) or from (11,0) through (11,12) to the Y=8-11 or Y=12-15 locations respectively in the MNOS memory 218. Following selection of the remote ENTER/RECALL key 246 at step 156, the program proceeds to the EN 22 routine at step 157 wherein the display is cleared by providing 0 to the (3,13) location in RAM 86 and the TENKEY flag is cleared by providing a 0 to the (3,6) location in RAM 86. The program next determines if AUTODIAL NUMBER 1 has been selected at step 158 and if so, provides the number 8 to RAM location (6,8) in establishing where the first digit from the RAM is to be provided in the MNOS memory. If the AUTODIAL NUMBER 1 is not detected at step 158, the program provides the first RAM digit to the Y=12 location in the MNOS memory. The program then enters the FIX subroutine at step 159 and sends a 0 to RAM location (6,9) for setting the RAM Y location and provides 0 to the (2,0) location in counting the number of digits entered in RAM. The BLK 4 at step 160 then updates system timing and the system returns to BLK 1 at step 160A where all of the MNOS-related routines occur. In the MNOS 2 routine at step 161, the program checks for a CHANNEL ERASE/WRITE operation at step 162 and a TELEPHONE NUMBER ERASE/WRITE operation at step 164. If a CHANNEL ERASE/WRITE operation is detected, the program branches to the MNOS 3 routine at step 163. If a TELEPHONE NUMBER ERASE/WRITE operation is detected, the program branches to the MNOS 6 routine at step 166 wherein data in RAM is transferred from location (6,8) to (0,3) which is MNOS Y data. In addition, RAM Y data is transferred from location (6,9) to location (0,2) in the scratch pad area. The MNOS Y data is then transferred to the accumulator 78 and the ADD AT 2 subroutine at step 167 is initiated for setting the MNOS X value by decrementing the previously set MNOS X value in the MNOS 1 subroutine.

The ADRY subroutine at step 168 sets the CHIP ENABLE signal provided to the MNOS memory 218 high and data is provided from the RAM 86 to the MNOS memory 218 in the DATA IN routine at step 169. This is followed by the resetting of the CHIP ENABLE pulse to 0 by the ADRX routine at step 170 where the CHIP ENABLE pulse is reset to 0. The GETX routine at step 171 is next executed wherein the AUTODIAL number is incremented by 9 and provided to the next address of the MNOS memory with 0 provided to the Y address of the MNOS.

The program next proceeds to the TELDAT routine 172 where the contents of RAM location (0,2) are loaded into the accumulator at the RAM Y address which initially is 0. The ADDATO routine 173 is next executed wherein the contents of the accumulator is provided to the Y register and the contents of RAM address (10,0) is provided to the accumulator. The ADRX subroutine at step 176 takes whatever is in the microcomputer's accumulator, outputs it to the microcomputer's data bus and toggles the CHIP ENABLE line to 0 for the loading of a control code number into the MNOS memory. In addition, the MNOS X value is incremented by 1 for providing the proper MNOS location for the second number read therein.

The program next proceeds to the TB 3 (Test Bit) instruction at step 177 and executes a loop for successively incrementing the X address location in the MNOS four times. Following the incrementing of the X address from G0 to G3, the program at step 178 increments the Y address of the MNOS for storing the fifth alphanumeric character of the stored telephone number. This is done following the transition of the CHIP ENABLE signal from a low to a high state in preparing the MNOS memory for receiving data from the microcomputer's accumulator 78. By means of the TB 3 instruction, the program determines when the last telephone number character has been stored in the appropriate MNOS memory loction. The program then resets RAM memory location (6,8) which indicates the end of an MNOS programming cycle followed by a check to determine if the program is within a valid range of MNOS Y memory values, i.e., 9-11 or 13-15. If the program is no longer operating in a valid MNOS Y value range, the routine is terminated at step 180. Similarly, if the program is still operating in a valid range of Y values for the MNOS memory, the contents of the accumulator are transmitted to RAM location (6,8) in providing the next MNOS Y value for telephone AUTODIAL number storage therein.

Referring to FIG. 11, there is shown the program steps in reading a stored telephone number from the MNOS memory 218 and writing it into RAM 86. Once power is applied to the television/telephone system of the present invention in step 182, the program executes an MNOSCH routine 183 in the MNOS READ/WRITE block 82 of FIG. 6 wherein a check is made to determine if it is the first time power has been applied to the television/telephone system. If power has previously been applied to the television/telephone system, the program branches at step 184 to the OUTPUT REFRESH block 84 of FIG. 6. If it is the first time that power has been applied to the television/telephone system, the program branches to the WA 88 subroutine at step 185 where an 880 millisecond interval is introduced into the program for the purpose of stabilizing the MNOS memory bias voltages following initial turn on. This is accomplished in steps 185, 186 and 187. Following this 880 millisecond period, the program loads 10 into the X register of the RAM and an 8 is loaded into RAM location (0,3) which represents the MNOS Y value in the TELF subroutine 188. Next, the TELF 2 subroutine at step 189 loads a 0 into the (0,0) scratch pad register of the RAM which represents the MNOS X value and 15 is loaded into the (0,1) RAM Y register.

The TELF 1 routine at step 190 initiates the reading of the contents of the aforementioned RAM locations into the aforementioned MNOS memory locations. The XFRAM subroutine at step 191 provides the contents of the RAM scratch pad register (0,0) to the accumulator 78. The ADRX routine at step 192 causes the CHIP ENABLE line to the MNOS memory to go low and provides the contents of RAM location (0,3), which represents the MNOS X value, to the accumulator. The ADRX subroutine at step 192 causes the CHIP ENABLE signal to transition to the low state with the X information thus provided to the MNOS memory 218. In addition, the contents of RAM location (0,3) are provided to the accumulator with the ADRY subroutine at step 193 causing the CHIP ENABLE signal to transition to the high state for loading this Y information into the MNOS. Next, 13 is loaded into the accumulator as an instruction that the contents thereof are to be read therefrom. In the ADRX subroutine at step 194, 1's are sent out to all the data buses to insure that they are in a high state, and the contents of the data bus are then loaded into the accumulator in addition to being placed in scratch pad memory location (0,2). This represents the first number being read from the MNOS and is denoted by the word DATA. A CLEAR operation is next performed by sending 0 to the accumulator and calling up the ADRY subroutine at step 195. The data then goes out and the control line toggles up. The (0,1) RAM Y value is then incremented by 1 which provides the next RAM Y value and this sequential loop continues with each RAM Y value taken in turn from the temporary storage location (0,2) in RAM.

The program next executes a RETURN at step 196 and increments the MNOS memory value by 1 for reading out the next sequential alphanumeric character of the stored telephone number. The sequential incrementing of the X value in the MNOS memory continues in the loop provided by step 197 until the contents of the X=4 location in the MNOS memory are read therefrom whereupon the MNOS Y value is incremented by 1 and the next four telephone digits are read from the MNOS memory and are provided to the RAM. Thus, step 197 provides for the sequential reading from the MNOS memory of the X values with a loop back to TELF 1 at step 190 provided until all four digits in an X location in the MNOS memory are read therefrom and provided to the RAM 86. A Y loop is provided by step 198 wherein the MNOS Y values are sequentially incremented and a loop back to the TELF 1 subroutine is executed until the complete telephone number stored in the MNOS memory has been read therefrom and provided to the RAM 86. Once a complete telephone number has been read from MNOS Y memory locations 8-11, the RAM X value is incremented with Y being loaded into the X register of the RAM. The program then jumps to TELF 2 at step 200 and executes the previously described X and Y loops with regard to the MNOS memory and the RAM. Thus, the first stored telephone number is sequentially read from the MNOS memory and provided to the RAM, which is followed by the sequential reading of the second telephone number stored in the MNOS and providing this number to the RAM 86 for storage therein and recall therefrom.

There has thus been provided a television/telephone system with an automatic dialing capability wherein select telephone numbers are stored in a memory and automatically recalled therefrom in response to a minimum number of user inputs. The remote control link of the television receiver is utilized for storing a plurality of predetermined telephone numbers in the memory and for automatically recalling a selected number therefrom in initiating a telephone call. The telephone numbers are stored and recalled from a non-volatile memory not subject to memory dropouts due to power interruptions by means of a microcomputer.

While particular embodiments of the present invention have be shown and described, it will be apparent to those skilled in the art that changes and modifications may be made therein without departing from the invention its broader aspects. The aim in the appended claims, therefore, is to cover all such changes and modifications as fall within the true spirit and scope of the invention. ##SPC1## ##SPC2##