JPH07264560A - Teletext broadcasting system - Google Patents

Abstract

PURPOSE:To transmit information with a comparatively high secrecy such as accounting information to a specific receiving subscriber by broadcasting a character program to which the ID of a transmitting destination is added from the transmitting side, and on the receiving side, checking the ID and receiving only the character program to which the ID of the receiving subscriber hismself (or herself) is added. CONSTITUTION:An automatic terminating part 14 receives a requested call through a 2nd interface part 13. An ID adding part 11 extracts the ID of a transmitting destination stored in a 2nd storage part 12 and supplies the ID to a television(TV) teletext broadcasting equipment 10. The equipment 10 simultaneously converts the program based upon the request and the required ID into a TV signal and sends the TV signal. The terminating part 14 receives a call indicating the completion of reception of the request program from the transmitting destination through the interface part 13. When the sending of all programs is ended, operation ends.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a teletext broadcasting system for transmitting / receiving a teletext program to which a destination ID (identification information) is added.

[0002]

2. Description of the Related Art A conventional teletext is a broadcast in which image information composed of characters or figures is transmitted as a digital signal by being multiplexed with a television signal and the receiving side decodes this signal and displays it on a television receiver. System. FIG. 4 shows a block diagram of an embodiment of a conventional teletext system. According to the figure, on the sending side, the text program production apparatus 20 produces a text program screen by combining a screen made up of characters and figures and an additional sound (not shown) if necessary. The teletext screen is encoded, and data for specifying the program number, page number, display mode, etc. is added. A large number of teletext programs are sequentially read out in accordance with the sending procedure, and the teletext program sending device 21 uses a synchronization signal, an error correction code, etc. as a character signal, and the text signal multiplexing device 22 outputs the TV video signal of the TV program sending device 24. It is superimposed on a predetermined horizontal scanning period (H) of the vertical blanking period (VBL), and is modulated into a transmission signal by the television transmission device 23 and output. On the receiving side, the teletext decoder unit 26
The television receiver 25 separates a character signal from the video signal obtained by demodulating the transmission signal, performs error correction, then decodes the character broadcast data, writes pattern data and graphic data to the display memory, and reads the data. The video signal is output to the television receiver 25, and the television receiver 25 displays it on a picture tube.

However, as described above, since the conventional teletext system is a so-called broadcast, anyone can receive and watch all transmitted teletext programs. Therefore, for example, there is a problem that it is not possible to send information with a certain degree of confidentiality, billing information, etc. to a specific recipient.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and a teletext system, for example, C
This is realized in the form of a closed system by using S (communication satellite) broadcasting and CATV (cable television), and the transmitting side responds to a request from the receiving side via a telephone line to receive a teletext program. It is an object of the present invention to provide a teletext broadcasting system in which a destination ID is added to broadcast and a receiving side can receive only a program that matches its own ID.

[0005]

In order to achieve the above object, a television character multiplex broadcasting apparatus on the transmitting side and a plurality of television character multiplex receiving apparatuses for receiving broadcast waves from the television character multiplex broadcasting apparatus are provided. For a teletext broadcasting system, a teletext signal processing unit, which is provided for each of the above teletext multiplex receivers, to decode teletext data to generate a video signal, and whether the ID added to the program is its own ID An ID identifying unit that identifies the ID, a storage unit that stores the own ID and the decoded teletext data, a control unit that controls each unit, and a TV text multiplex broadcasting apparatus provided for each program destination. An ID adding unit that adds a different ID and a storage unit that stores the destination and the ID in association with each other are provided, and a character program in which the ID of the destination is added to the program is broadcast,
The receiving side checks the ID and receives only the text program to which its own ID is added.

[0006]

With the above configuration, the television character multiplex broadcasting apparatus generates a character program, adds the ID of the transmission destination to the broadcast program, multiplexes it with the television signal and transmits it, and the television character multiplex receiving apparatus receives it. The teletext data is extracted from the television signal and decoded, and the ID identification section identifies the ID and receives only the program of its own ID.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A teletext broadcasting system according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is a block diagram of an embodiment of a teletext broadcasting system according to the present invention. Reference numeral 1 is a television receiver of the television character multiplex receiver. Reference numeral 2 denotes a teletext signal processing unit that extracts a teletext signal from the video signal output from the television receiving unit 1 and decodes the teletext data to generate a video signal. An ID identification unit 3 identifies whether or not the ID added to the program is its own ID. A first storage unit 4 stores the ID of the user and the decoded teletext data. Reference numeral 5 denotes an instruction input unit (not shown) of the television character multiplex receiving apparatus, which is an automatic dialing unit for automatically calling the character program transmission side according to an instruction from a keypad or the like. Reference numeral 6 is a first interface unit connected to a telephone line. Reference numeral 7 is a first control unit that controls each unit on the reception side. Reference numeral 10 denotes a television character multiplex broadcasting device that generates a character program, superimposes it on a television signal, modulates it into a transmission signal, and outputs it. Reference numeral 11 denotes an ID adding unit that supplies the TV character multiplex broadcasting apparatus with an ID that differs for each destination. A second storage unit 12 stores the destination and the ID in association with each other. A second interface unit 13 is connected to the telephone line. Reference numeral 14 denotes an automatic call receiving section for automatically receiving a telephone call from the automatic dial section 5. Reference numeral 15 is a second control unit that controls each unit on the transmission side.

The operation of the teletext broadcasting system according to the present invention will be described with reference to FIGS. FIG. 2 is a conceptual diagram of storing a destination and an ID in the second storage unit 12 in association with each other. For example, when a request such as a program for informing the result of horse racing is issued from the destination AA, the ID addition unit 11
Adds the AA ID: 10001 to the corresponding program. In addition, when a request for a program or the like that notifies the same horse racing result is generated from a plurality of destinations, the ID addition unit 1
1 adds a plurality of IDs for each destination to the corresponding program.

FIG. 3 is an operation flowchart of the teletext broadcasting system according to the present invention. The operation on the transmission side shown in FIG. 3A will be described. In step 1, the automatic call receiving unit 14 receives the request telephone via the second interface unit 13. In step 2, the ID adding unit 11 extracts the ID of the transmission destination stored in the second storage unit 12 and supplies it to the television character multiplex broadcasting device 10. In step 3, the television character multiplex broadcasting apparatus 10 converts the program based on the request and a required ID together into a television signal and sends it out. In step 4, the second interface unit 1 sends a call from the destination indicating that the reception of the requested program has been completed.
It is received by the automatic call receiving unit 14 via 3. In step 5, it is checked whether or not the transmission of all the programs based on the request is completed, and if the transmission is completed (YES),
The operation ends. On the other hand, if the program to be transmitted remains in step 5 (NO), the process returns to step 3 to continue the operation.

The operation of the receiving side shown in FIG. 3B will be described. In step 1, the automatic dial section 5 is set to the sending side by the instruction input section (not shown) of the television character multiplex receiver, for example, by operating a request key or the like from a keypad or the like to specify the program number. A call is made via the interface unit 6 to make a telephone request for the program. In step 2, the television receiver 1 receives a television signal, demodulates a video signal, and outputs it. The teletext signal processing unit 2 extracts the teletext signal from the video signal and decodes the teletext data. The ID identification unit 3 checks the ID in the teletext data to identify whether or not it is the user's own ID. Only the program with its own ID added is stored in the first storage unit 4 according to the identification result. In step 3, the automatic dialing unit 5 calls the sending side via the first interface unit 6 to call the sending side to notify the end of reception of the program.

Incidentally, the method of transmitting or transmitting the teletext is as follows.
It may be a cable system such as CATV or a system using a CS broadcasting system. Also, CA
In the case of a teletext broadcasting system using a TV, the method is not limited to the method of making a request and the notification of the reception end by using a telephone line, and the method of frequency multiplexing on a coaxial cable may be used.

[0012]

As described above, the present invention provides a teletext system such as CS (communication satellite) broadcast or CAT.
This is realized in the form of a closed system by using V (cable television), and the transmission side adds the destination ID to the teletext program in response to the request from the reception side via the telephone line. It provides a teletext broadcasting system that broadcasts and the receiving side can receive only the program that matches its own ID. Therefore, for example, there is a merit that information having a certain degree of confidentiality, billing information, and the like can be transmitted to a specific recipient.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of a teletext broadcasting system according to the present invention.

FIG. 2 is a conceptual diagram of storing a destination and an ID in association with each other in a second storage unit of the teletext broadcasting system according to the present invention.

FIG. 3 is an operation flowchart of the teletext broadcasting system according to the present invention.

FIG. 4 is a block diagram of an embodiment of a conventional teletext system.

[Explanation of Codes] 1 TV receiver 2 Teletext signal processing unit 3 ID identification unit 4 First storage unit 5 Automatic dialing unit 6 First interface unit 7 First control unit 10 Television teletext broadcasting device 11 ID addition unit 12th Second storage unit 13 Second interface unit 14 Automatic call receiving unit 15 Second control unit 20 Character program production device 21 Character broadcasting program transmission device 22 Character signal multiplexing device 23 Television transmission device 24 Television program transmission device 25 Television receiver 26 Character broadcasting Decoder part

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Claims (5)

[Claims] 1. A television character multiplex receiving apparatus comprising: a television character multiplex broadcasting apparatus on the sending side; and a plurality of television character multiplex receiving apparatuses for receiving broadcast waves from the television character multiplex broadcasting apparatus. A teletext signal processing unit, which is provided for each of the units, that decodes teletext data to generate a video signal, an ID identifying unit that identifies whether the ID added to the program is your ID, and your own ID. A storage unit that stores the decrypted teletext data, a control unit that controls each unit, an ID addition unit that is provided in the television teletext broadcast device, that adds a different ID to the program for each transmission destination, and the transmission destination. I
And a storage unit that stores D in association with each other, and broadcasts a character program in which the ID of the transmission destination is added to the program, and the receiving side checks the ID and receives only the character program in which its own ID is added. Teletext broadcasting system. 2. An automatic dial section for automatically calling the character program transmitting side to the television character multiplex receiving device,
Provide a first interface part to connect to the telephone line,
The TV character multiplex broadcasting apparatus is provided with a second interface section connected to a telephone line and an automatic call receiving section for automatically receiving a telephone call from the automatic dial section. The teletext broadcasting system according to claim 1, wherein a desired broadcast program is requested via the. 3. The teletext broadcasting system according to claim 1, wherein the ID adding unit adds a plurality of destination IDs to the same program. 4. The teletext broadcasting system according to claim 1, wherein a wired system such as CATV or a CS broadcasting system is used for the method of transmitting the teletext. 5. The teletext broadcasting system according to claim 4, wherein a request signal for a desired broadcast program is frequency-multiplexed on a coaxial cable instead of the telephone line.