Bar Code Transmission and Reception System and Method

In various kinds of conventional methods of sending signals scanned by a bar code to a remote location, the signal once read out by the bar code is applied directly to a computer or a personal computer to be transformed into a digital signal, and thereafter that signal is sent out to the remote location through a telephone line or the like. A signal receiving device decodes that signal and transforms it into the original bar code. That original bar code is read by a reader.

Recently in a VCR or the like, a desired TV program is scanned by the bar code to control the VCR. In order to carry out this control more conveniently, there is a great demand for scanning the bar code on a TV program table by a portable bar code reader and sending it through the telephone line. However, there are difficulties in practical use in the conventional method in order to easily send the signal by means of the portable bar code reader or the like through the telephone line.

The present invention relates to a bar code transmission and reception system and method.

It is an object of the present invention to provide a novel bar code transmission and reception system and method wherein a bar code of a TV program or the like is read by a portable bar code reader and stored. Thereafter a receiving device is called by telephone using standard telephone lines, the stored bar code signal is encoded and sent from a loudspeaker through the mouthpiece of a telephone set in the form of an audible frequency signal, that audible frequency signal is received by the receiving device to decode it into the bar code signal, and that bar code is transformed into infrared rays so as to control a desired apparatus.

The above and other objects, features and advantages of the present invention will become more apparent from the following description when taken in conjunction with the accompanying drawings in which a preferred embodiment of the present invention is shown by way of illustrative example.

FIG. 1 is a block view explaining the principle of a preferred embodiment of this invention.

FIG. 2 is a block view explaining the transmitting section of the preferred embodiment of this invention.

FIG. 3 is a block view explaining the receiving section of the preferred embodiment of this invention.

FIG. 4 is a view showing the content of a bar code of the preferred embodiment of this invention.

FIGS. 5(a)-(d) show waveforms of the bar code of the preferred embodiment of the invention.

The arrangement and operation in the preferred embodiment of the present invention will now be described as follows. FIG. 1 is a block view explaining one preferred embodiment of this invention. Therein, reference numeral 1 denotes a transmitting section which outputs a code as an audio tone modulated by a specific frequency, after a bar code printed on a TV program table (not shown) is read and the read code is memorized temporarily. Reference numeral 2 denotes a telephone set of the sending side used by the owner who carries the transmitting section. Reference numeral 3 denotes a telephone exchange of the sending side. Reference numeral 5 denotes a receiving section which sends an outgoing message after the calling signal is received and the telephone line is set to a closed condition. When the owner outputs the bar code read by the transmitting section 1 through a mouthpiece (not shown in the drawings) of the telephone set 2 which is coupled acoustically, the output bar code reaches the receiving section through the telephone line, the telephone exchange 3 and the telephone exchange 4. The receiving section 5 demodulates the bar code modulated by audio frequency, 21 KHz in accordance with the frequency bandwidth of the telephone line, for example, but a VCR used in the preferred embodiment of the present invention is designed to receive the bar code modulated by no audio frequency of 28 KHz. Accordingly, this invention modulates the demodulated bar code to 28 KHz and sends the modulated bar code to a photodetector section of the VCR 6 through a light emitting diode (not shown in FIG. 1), and the TV program can be reserved for various minutes of time.

The invention will now be described in detail in accordance with FIG. 2-FIG. 5. FIG. 2 shows a block view of the transmitting section 1. In FIG. 2, reference numeral 20 denotes a bar code reader section which uses directly a circuit of a bar code reader set in the VCR 6 in the example. FIG. 5 shows the bar code and corresponding modulated output waveforms. The marking point of the bar code in FIG. 5(a) outputs pulses of 28 KHz as shown in FIG. 5(b) through bar code reader section 20. Only a sine wave within a 300 Hz-3 KHz band can be output to the general telephone line for talking over the telephone. Accordingly, the pulses in FIG. 5(b) are converted to a sine wave of 2.1 KHz by a D/A converter section 21, and are sent to a receiving section 5 by coupling the converter section 21 to the mouthpiece of the telephone set 1 through an amplifier 22 and a speaker 23.

FIG. 3 shows a detailed block view of the receiving section 5. In FIG. 3, reference symbols L1, L2 denote a telephone line. Reference symbol LT denotes a line transformer. Reference numeral 30 denotes a closing control section which sets a load relay Y-1 to ON when the calling signal is detected, sets the telephone line to the closed condition by the point of contact y1-1, and releases the closed condition of the telephone line by setting the relay Y-1 to OFF by detecting the voltage variation of the telephone line when the calling party sets the telephone set to on-hook.

Reference numeral 31 denotes an outgoing message control section which outputs a start pulse for sending an outgoing message, which will be described later, when the output from the closing control section is received. Reference numeral 32 denotes a speech synthesis section which outputs information identifying the channel, for example, received for confirmation by a synthesized voice, after the outgoing message and the bar code for reserving a TV program, which will be described later, are received.

Reference numerals 33 and 34 denote amplifiers. Reference numeral 35 denotes an ALC circuit which sets the received bar code to a proper level. Reference numeral 36 denotes a demodulating section which demodulates the modulated bar code of 2.1 KHz to a signal of 28 KHz for the VCR which receives the bar code. Reference numeral 37 denotes an output section for a light emitting diode 38 for emitting infrared rays.

Reference numeral 39 denotes a demodulated signal memory section which converts the demodulated bar code to the binary number system, and stores the converted code to the binary number system. Reference numeral 40 denotes a demodulated signal judgement section which determines whether the code converted to the binary number system is a start bit or is the channel number, etc. Reference numeral 41 denotes a speech synthesis control section which controls output of specific speech synthesis in response to the output from the demodulated signal judgement section 40.

Operation of this invention will be described as follows. In the receiving section which is constituted as above, when the receiving section receives a signal from a remote calling party, the calling signal is detected by the closing control section 30, and the load relay Y-1 is set to ON. As a result, the telephone line is set to the closed condition through the point of contact y1-1 of the relay Y-1, the calling signal stops, and the telephone set is set to a "talking condition" over the telephone. Plural pulses are output from the outgoing message control section, and the outgoing message, "I am not in, please call back later", for example, is selected in the speech synthesis section and is output. This outgoing message is sent to the calling party through the amplifier 33 and the line transformer LT.

When the calling party sends the bar code from the transmitting section 1 for reserving a TV program read from the TV program table etc., after the calling party listens to the outgoing message, the bar code shown in FIG. 5(c) is demodulated to the same waveform shown in FIG. 5(d) as the waveform shown in FIG. 5(b) through the line transformer LT, the amplifier 34 and the demodulating section 36. The waveform is sent to the VCR 6 as infrared rays, as shown in FIG. 1 through the output section 37 and the light emitting diode 38, and is stored in the memory (not shown in the drawings) of the VCR 6.

The content of the bar code starts with a start bit and ends with a stop bit, for example as shown in FIG. 4. The demodulated signal memory section 39 memorizes the channel, the month, the date, the start time, and the end time by the input thereof, when the start bit is detected, and stops inputting the data when the stop bit is detected. The data of the channel is sent to the demodulated signal judgement section, and the channel number is determined and sent as data to the speech synthesis control section 41. After the corresponding address in the speech synthesis section 32 is designated, the start pulse is output and synthesized speech, "Channel 4" for example, is sent to the calling party.

When the end of the synthesized speech is detected, a shift signal is output to the demodulated signal memory section 39 and the demodulated signal judgement section 40. The data relating to "month", which means the next code, is judged, and the synthesized speech, "November" for example, is sent.

When the owner sets the telephone set to on-hook after the owner listens to all the data by the synthesized speech and confirms that there is no mistake in the data, the on-hook is detected by the closing control section 30. As a result, the relay Y-1 is set to OFF, and the receiving section 5 is restored to the waiting condition. Accordingly, the data can be confirmed by the synthesized speech after the stop bit of the bar code is detected (it is possible to use a delay circuit of 2-3 seconds) so that it can be prevented that the bar code is masked by the output of the synthesized speech. The codes which form "channel" to "end time" shown in FIG. 3 are the numbers 0-9. When any other code is input, this input means an error, and "error" by the synthesized speech is sent.

This invention is explained relating to the remote control of a VCR, for example as above. However, it is available to all kinds of devices that send the read signal by using the bar code through the telephone line; accordingly, this invention can apply to devices in a wide scope.

As in the above explanation, this invention can send acoustically a signal to the receiving device of the other party through the mouthpiece of the telephone set from the telephone line by means which can not be anticipated by the conventional device that sends the bar code signal through the telephone line, namely, by modulating the signal and outputting the signal through the speaker by using a bar code reader, etc., which is carried in the pocket of each person. The invention decodes the signal, demodulates the signal to a bar code signal, and converts the bar code signal to an infrared signal. As a result, it is possible to use the invention for controlling intended machines and tools, for example. Accordingly the practical effect of the present forwarding device is increased.

The foregoing description of the preferred embodiment of the invention has been presented for purposes of illustration and description and is not intended to be exhaustive or to limit the invention to the precise forms disclosed, since many modifications and variations are possible in light of the above teaching. The embodiment was chosen and described in order best to explain the principles of the invention and its practical application, thereby to enable others skilled in the art best to utilize the invention in various embodiments and with various modifications as are suited to the particular use contemplated therefor. It is intended that the scope of the invention be defined by the claims appended hereto, when interpreted in accordance with full breadth to which they are legally and equitably entitled.