JPH08228327A - Repeater, decoder and data broadcasting method - Google Patents

Abstract

PURPOSE: To provide a repeater, a decoder and a data broadcasting method capable of performing the AM transmission of data for data broadcasting service. CONSTITUTION: After data broadcasting data is sampled by a data sampling circuit 33 and packetized by a data multiplex circuit 34 in a head end (repeater) 30, it is multiplexed on the VBI(vertical blanking interval) of a video signal and/or a video signal line, and moreover, it is re-modulated to AM by an AM re-modulation circuit 35, and sent out to a cable 47, and AM-transmitted to a reception terminal (decoder) 50. In this way, the data broadcasting data is transmitted to the reception terminal (decoder) 50 in co-viewing facility from which the AM transmission is being performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention uses data broadcasting data for AM.
The present invention relates to a relay device, a decoding device, and a data broadcasting method for transmitting.

[0002]

2. Description of the Related Art In recent years, pay satellite broadcasting has started, and a decoding device (decoder) for receiving and decoding the pay broadcasting is becoming popular.

On the other hand, a so-called AM transmission system, which is a joint reception system for re-modulating pay satellite broadcasting once received by an antenna to AM (amplitude modulation) and individually receiving it via a cable, has been proposed and is in the stage of practical application. . Details thereof are described in "Paid Broadcasting Device" of Japanese Patent Application No. 4-077936 filed by the applicant of the present application on March 31, 1992.

This is a broadcasting satellite (BS) or communication satellite (C
When receiving the broadcasting and communication services distributed by using S) at the co-listening facility, the relay device (hereinafter referred to as the head end) receives and demodulates the received signal.
It is re-modulated to and distributed to co-listening facilities. further,
At these co-listening facilities, the practical use of a system that enables scrambled broadcasting and communication services, which have been performed in recent years, with individual contracts for individual households as well as individual reception has started. Since such a system is operated by individual contract,
It has the merit that the broadcaster (that is, the center broadcasting station) can centrally manage the viewing management.

FIG. 8 shows a pay satellite broadcasting system relating to the above patent application.

[0006] This system is a transmitter 10 for pay satellite broadcasting.
The radio wave transmitted from 0 goes through a broadcasting satellite (BS) and an antenna through a CATV (Community Anntena T
V, Cable TV) and co-listening reception systems, etc. are supplied to the head end, and are distributed individually from the head end to the decoding device (hereinafter referred to as the receiving terminal) of each viewing subscriber via a cable.

B transmitted from the transmitter (broadcasting station) 100
The S broadcast radio wave is received by the BS antenna 2 for joint reception via the BS 1 and is sent to the head end 3 as a BS-IF signal. In the head end 3, the FM signal is detected by the BS tuner, the scrambled video signal and the bit stream are separated, and the scrambled audio signal and the information signal for descrambling the bit stream (the scramble timing TS and the scramble flags VS, R #). 8) and related information packets (program information, control information, individual information and message information) are separated, the information signal for descrambling is packetized, and the packet of the packetized information signal for descrambling is formed. After time division multiplexing with the related information packet,
A scrambled video signal that is multiplexed (superimposed) on a plurality of specific lines in a vertical blanking period (hereinafter referred to as VBI) of the scrambled video signal, and further, this VBI-multiplexed scrambled video signal and a signal that is descrambled with the scrambled audio signal Are re-modulated (AM-modulated), frequency-multiplexed, and transmitted to the cable 4.

The cable 4 has a plurality of VBIs for each user.
A receiving terminal 5 compatible with multiplexing is connected. The receiving terminal 5 performs AM detection by the VHF / UHF tuner, separates the scrambled video signal and the audio signal, further separates the packet multiplexed in the VBI of the scrambled video signal, and then descrambles the separated packets. The scrambled video signal is descrambled based on the information packet for The voice signal is further demodulated by voice. The demodulated video signal and audio signal are input to a television receiver (TV) not shown.

In FIG. 8, the aerial system for transmitting signals by radio waves from the transmitter to the headend via the satellite is referred to as a first transmission system,
A cable system for transmitting signals from the head end to the terminal side is referred to as a second transmission system.

Program information, individual information, control information,
The details of the message information are described in the report of the telecommunications technology council for pay satellite broadcasting (see pages 48 to 57). Here, these will be briefly described.

The program information carries information necessary for descrambling and a program number and is transmitted in a predetermined cycle (for example, 1 second). If the terminal side removes this program information, it will be impossible to descramble for a certain period of time.
The control information is for temporarily disabling the viewing when the viewing fee has not been paid, and for allowing the viewing to be restored after the payment is made, and forcibly turning on / off by designating a specific terminal. can do. The individual information is transmitted by carrying the encryption key KW and the like, and includes the contract service, the contract registration code, the expiration date, and the like, and is transmitted only to the decoder of the person who has the viewing contract. The message information is for transmitting character information such as a program name.

FIG. 9 shows a block diagram of a conventional AM transmission system. This system receives a satellite broadcast, multiplexes various pay-related information into a vertical blanking period (VBI) of a video signal and AM-modulates it, and selects and demodulates this AM signal to generate a VBI multiplexed signal. It is composed of a receiving terminal 5 for separate decoding and descrambling, and the center broadcasting station can directly manage each terminal by individual information and control information.

The head end 3 of the co-listening facility receives the IF signal 101 from the antenna at the BS / CS tuner 11 and descrambles only the voice in the scramble decoding unit 12, and at the same time, scramble-related information 103.
Together with the scrambled video signal 104, the VBI multiplexing circuit 1
Output to 3. In the VBI multiplexing circuit 13, scramble-related information 1 is added to the VBI portion of the scrambled video signal 104.
03 is multiplexed by 2 lines in 1 field with 1 packet / line. The video signal 105 multiplexed with the scramble-related information 103 is a descramble audio signal 106.
At the same time, the signal is re-modulated by the AM re-modulation circuit 14 and is output to the common listening cable 15. The AM signal 107 distributed to each home by the common listening cable 15 is the CAT of the receiving terminal 5.
The video signal is received by the V tuner 16, demodulated by the video demodulation circuit 17, and further demodulated by the voice demodulation circuit 18. The demodulated video signal 109 is VB in the packet extraction circuit 22.
The scramble-related information packet of the I part is extracted, and the packet processing circuit 23 performs type determination and error correction. The scramble-related information packet 117 processed by the packet processing circuit 23 is stored in the security processing circuit 24.
The digital video signal 113 after A / D conversion is descrambled in the video descramble processing circuit 20 on the basis of the data 118 which is sent to
After being D / A converted by the A converter 21, it is output as a video signal.

In satellite broadcasting, standard television broadcasting is broadcast by the digital subcarrier NTSC system, and high-definition broadcasting is broadcast by the MUSE system. These voice signals are digitally transmitted and have an independent data section for transmitting non-voice data. Further, it is possible to transmit data even in the voice region or in the region where voice is not actually transmitted. The area that can be used for data transmission is called a data channel, and the broadcasting service using the data channel is called a data broadcast.

Thus, as a recent new satellite service, a data broadcasting service using the independent data area and the audio area of satellite broadcasting is about to be started. In the conventional AM transmission system described above, the voice signal is descrambled by the head end 3 and is AM-transmitted, and the data in the independent data area and the voice area is not transmitted except for the scramble-related information. Therefore, when the data broadcasting service is started, in the co-listening facility of the above AM transmission system,
It is impossible to transmit and view the data broadcasting data as it is. In other words, in the conventional AM transmission system, the data in the independent data area and the audio area in the digitally transmitted audio signal cannot be AM-transmitted.

[0016]

As described above, the conventional A
In the M transmission system, there is a problem that data of the data broadcasting service cannot be transmitted.

Therefore, in view of the above problems, it is an object of the present invention to provide a relay device, a decoding device and a data broadcasting method capable of AM transmitting data of a data broadcasting service.

[0018]

According to a first aspect of the present invention, there is provided a relay device, which includes demodulation means for receiving and demodulating a television information signal transmitted via a first transmission system, and the demodulated television information signal. Extracting means for extracting the data broadcasting data from the packetizing means, packetizing means for packetizing the extracted data broadcasting data, and vertical blanking period of the video signal in the television information signal for the packetized data broadcasting data, And / or an AM re-modulation means for re-modulating the data-multiplexed video signal into an AM signal and sending it to the second transmission system. And

According to a second aspect of the present invention, there is provided a relay device, which includes demodulation means for receiving and demodulating a television information signal transmitted via the first transmission system, and program contents of data broadcasting from the demodulated television information signal. Extracting means for identifying only the required program data, storage means for temporarily storing the extracted data broadcast data, and packetizing means for packetizing the stored program data,
This packetized program data is used for the vertical blanking period of the video signal in the television information signal and / or
Alternatively, it is provided with a data multiplexing means for multiplexing on a horizontal line of the video signal, and an AM remodulating means for remodulating the data multiplexed video signal into an AM signal and sending it to the second transmission system. To do.

A decoding device according to a third aspect of the present invention comprises demodulation means for receiving and demodulating an AM signal transmitted from the relay device according to the first or second aspect via a second transmission system.
It is characterized by comprising a packet extracting means for extracting a data broadcast data packet from the demodulated video signal and a means for reproducing data from the extracted data broadcast data packet.

A decoding device according to a fourth aspect of the present invention comprises demodulation means for receiving and demodulating an AM signal transmitted from the relay device according to the first or second aspect via a second transmission system.
A packet extracting means for extracting a data broadcast data packet from the demodulated video signal, a means for reproducing data from the extracted data broadcast data packet, and a portion where the data packet of the video signal is multiplexed, A means for replacing with a signal of a predetermined level to indicate that it is a used area, or for multiplexing a message signal for displaying a message in the area is provided.

In the data broadcasting method according to the present invention, the data broadcasting data is extracted from the demodulated television information signal while receiving and demodulating the television information signal transmitted through the first transmission system. After packetizing, the packet data is multiplexed on the vertical blanking period of the video signal in the television information signal and / or on the horizontal line of the video signal, and the data signal multiplexed video signal is re-modulated into an AM signal. And sends it to the decoding device via the second transmission system, and the decoding device receives and demodulates the AM signal transmitted via the second transmission system, and broadcasts the data from the demodulated video signal. After extracting the data packet, the packet data is reproduced.

According to a sixth aspect of the data broadcasting method of the present invention, the television information signal transmitted through the first transmission system is received and demodulated, and the data broadcasting data is extracted from the demodulated television information signal. After packetizing, the packet data is multiplexed on the vertical blanking period of the video signal in the television information signal and / or on the horizontal line of the video signal, and the data signal multiplexed video signal is re-modulated into an AM signal. And sends it to the decoding device via the second transmission system, and the decoding device receives and demodulates the AM signal transmitted via the second transmission system, and broadcasts the data from the demodulated video signal. After the data packet is extracted, the packet data is reproduced, and the portion where the data packet of the video signal is multiplexed is the data broadcast use area. Replaced by a signal of a predetermined level to indicate the bets, or characterized thereby multiplexed message signals for message displayed in the region.

According to a seventh aspect of the data broadcasting method of the present invention, while receiving and demodulating a television information signal transmitted via the first transmission system, data demodulated program content is obtained from the demodulated television information signal. After extracting only the data of the required program and temporarily storing and packetizing the data, the packet data is placed on the vertical blanking period of the video signal and / or on the horizontal line of the video signal in the television information signal. , The data signal is re-modulated into an AM signal and transmitted, and transmitted to the decoding device via the second transmission system.
It is characterized in that an AM signal transmitted via the transmission system of (1) is received and demodulated, a data broadcast data packet is extracted from the demodulated video signal, and then the packet data is reproduced.

In the data broadcasting method according to the present invention, the television information signal transmitted through the first transmission system is received and demodulated, and the program content of the data broadcasting is obtained from the demodulated television information signal. After extracting only the data of the required program and temporarily storing and packetizing the data, the packet data is placed on the vertical blanking period of the video signal and / or on the horizontal line of the video signal in the television information signal. , The data signal is re-modulated into an AM signal and transmitted, and transmitted to the decoding device via the second transmission system.
After receiving and demodulating an AM signal transmitted via the transmission system of FIG. 1 and extracting a data broadcast data packet from the demodulated video signal, the packet data is reproduced and the data packet of the video signal is multiplexed. The above portion is replaced with a signal of a predetermined level to indicate that it is a data broadcasting use area, or a message signal for displaying a message is multiplexed in the area.

A relay device according to the invention of claim 9 comprises a plurality of relay devices, of which the first relay device is
Demodulation means for receiving and demodulating a television information signal including data broadcast data transmitted via the first transmission system, and program content of the data broadcast is identified from the demodulated television information signal, and data is provided for each program. Extraction means for extracting,
Data transfer means for transferring the extracted data broadcast data of each program so as to correspond to the plurality of relay devices allocated for each program, and a storage for temporarily storing one program data from this transfer means. Means, packetizing means for packetizing the stored program data, and the packetized program data are multiplexed on the vertical blanking period of the video signal and / or on the horizontal line of the video signal in the television information signal. Data multiplexing means to
AM re-modulation means for re-modulating the data-multiplexed video signal into an AM signal and sending it to a second transmission system, wherein the other relay device among the plurality of relay devices is the first relay device. Storage means for temporarily storing data for each program from the data transfer means of the relay device, packetizing means for packetizing the stored program data, and relaying the packetized program data Data multiplexing means for multiplexing on the vertical blanking period of the video signal of the device and / or on the horizontal line of the video signal, and AM for re-modulating the data multiplexed video signal into an AM signal and sending it to the second transmission system. And a re-modulation means.

The decoding device according to the tenth aspect of the invention is
A selecting means for selecting an AM signal transmitted from a plurality of repeaters according to claim 9 via a second transmission system, a demodulating means for receiving and demodulating the selected AM signal, and the demodulated video. It is characterized by comprising a packet extracting means for extracting a data broadcast data packet from a signal and a means for reproducing data from the extracted data broadcast data packet.

A data broadcasting method according to an eleventh aspect of the present invention includes a plurality of relay devices, one of which relay device receives and demodulates a television information signal transmitted via a first transmission system. The content of the program of the data broadcast is identified from the demodulated television information signal, the data is extracted for each program, and the extracted data broadcast data of each program is transferred to the plurality of relay devices assigned for each program. Then, after the program data is temporarily stored in each relay device and packetized, the packet data is placed on the vertical blanking period of the video signal of the television information signal and / or on the horizontal line of the video signal in each relay device. A second transmission system, which multiplexes the data, and further remodulates the data-multiplexed video signal into an AM signal and sends the AM signal to a plurality of channels corresponding to each relay device, To the decoding device, and the decoding device receives and demodulates one AM signal selected from a plurality of channels transmitted via the second transmission system, and a data broadcast data packet from the demodulated video signal. After the extraction, the packet data is reproduced.

A relay device according to the invention of claim 12 is
The first relay device includes a plurality of relay devices, and the first relay device includes demodulation means for receiving and demodulating a television information signal including data broadcast data transmitted via the first transmission system, and demodulated television information. Extraction means for extracting data broadcast data from a signal and outputting the extracted data in a time division manner, data transfer means for transferring each of the time division data so as to correspond to the plurality of relay devices, and this transfer Packetizing means for packetizing one data output from the means, and the packetized data are multiplexed on the vertical blanking period of the video signal and / or on the horizontal line of the video signal in the television information signal. The data remultiplexing means and the AM remodulation means for remodulating the data-multiplexed video signal into an AM signal and sending it to the second transmission system. The other relay device of the plurality of relay devices is a packetizer that packetizes the data output from the data transfer unit of the first relay device, and the packetized data of the relay device. Data multiplexing means for multiplexing on the vertical blanking period of the video signal and / or on the horizontal line of the video signal, and AM remodulation for remodulating the data multiplexed video signal into an AM signal and sending it to the second transmission system. Means and means are provided. A decoding device according to a thirteenth aspect of the present invention includes a plurality of demodulation means for receiving and demodulating a plurality of AM signals transmitted from the relay device according to the twelfth aspect via a second transmission system, and these demodulation means. A plurality of packet extracting means for extracting data broadcasting data packets from the respective video signals, and means for reproducing data from the plurality of extracted data broadcasting data packets in synchronization with the time-divisional timing. It is characterized by having done.

A data broadcasting method according to a fourteenth aspect of the present invention comprises a plurality of relay devices, one of which relay device receives and demodulates a television information signal transmitted through the first transmission system. Data broadcast data is extracted from the demodulated television information signal, the extracted data broadcast data is time-divisionally transferred to the plurality of relay devices, and the time-division data is packetized by each relay device. , The packet data is multiplexed on the vertical blanking period of the video signal of the television information signal and / or on the horizontal line of the video signal in each relay device, and the data signal multiplexed video signal is re-modulated into an AM signal. To send to a plurality of channels corresponding to each relay device,
Is transmitted to the decoding device via the transmission system of the second transmission system, and the decoding device receives and demodulates the AM signals of the plurality of channels transmitted via the second transmission system using the plurality of demodulation means, and the demodulated video After extracting a plurality of time division data packets from the signal, the plurality of packet data are reproduced in synchronization with the time division timing.

The relay device according to the invention of claim 15 is
A plurality of relay devices, one of which is a first relay device, and a plurality of other relay devices other than the first relay device are second relay devices, and the second relay device is A plurality of television information signals including data broadcasting data can be input, and the first relay device is configured to operate the second relay device.
A plurality of data broadcast data extracted by the relay device, and each of the relay devices constituting the second relay device is a data broadcast data transmitted via the first transmission system. Demodulating means for receiving and demodulating a television information signal including a signal, extracting means for extracting data broadcasting data from the demodulated television information signal, and the extracted data broadcasting data is transferred to the first relay device. Data transfer means, and the first relay device receives a plurality of data broadcast data from each relay device transferred from the transfer means, and temporarily stores the data broadcast data, and these storage devices. Packetizing means for packetizing a plurality of data broadcasting data, video signal generating means for generating a video signal, and a plurality of data broadcasting data packetized by the packetizing means. Data multiplexing means for time-division-multiplexing the data on the vertical blanking period of the video signal and / or the horizontal line of the video signal from the video signal generating means, and the data-multiplexed video signal is re-modulated into an AM signal. Second
And an AM remodulation means for sending to the transmission system.

The decoding device according to the sixteenth aspect of the present invention is
16. A demodulation unit for receiving and demodulating an AM signal transmitted from the relay device via the second transmission system according to claim 15, and desired data from a plurality of data broadcasting data packets included in the demodulated video signal. It is characterized by further comprising packet extracting means for separating and extracting the broadcast data packet at the time division timing, and means for reproducing data from the extracted data broadcast data packet.

A data broadcasting method according to a seventeenth aspect of the present invention comprises a plurality of relay devices, one of which is the first relay device, and a plurality of other relay devices excluding the first relay device. A second relay device, wherein the second relay device is capable of inputting a plurality of television information signals including data broadcast data, and the first relay device is a plurality of the relay devices extracted by the second relay device. Data broadcasting data can be input, and each of the relay devices constituting the second relay device receives the television information signal including the data broadcasting data transmitted via the first transmission system. The data broadcast data is demodulated and extracted from the demodulated television information signal and transferred to the first relay device. In the first relay device, the data broadcast data is transferred from each relay device of the second relay device. Multiple Data broadcasting data is input, temporarily stored, packetized, and time-division multiplexed on the vertical blanking period of the video signal and / or on the horizontal line of the video signal created by the video signal generating means. Is re-modulated into an AM signal and transmitted to the second transmission system, and the decoding device receives and demodulates the AM signal transmitted via the second transmission system, and a plurality of data included in the demodulated video signal. A desired data broadcast data packet is separated and extracted from the broadcast data packet at the time division timing, and data is reproduced from the extracted data broadcast data packet.

[0034]

According to the first and fifth aspects of the present invention, the data broadcasting data is extracted and packetized in the repeater (head end), and then multiplexed on the VBI of the video signal and the video signal line and AM. To transmit. This allows AM
The data broadcasting data can be transmitted to each decoding device (reception terminal) in the co-listening facility transmitting the data.

According to the second and seventh aspects of the present invention, of the data broadcasting data, only the program data designated in advance can be multiplexed on the VBI of the video signal and the video signal line for AM transmission. Compared to the case of transmitting all data, the amount of transmission can be reduced and the data area occupied in the video area can be reduced.

According to the ninth and eleventh aspects of the invention, the data broadcasting data can be transmitted by AM on different channels for each program, and the data area occupied in the video area can be reduced in each channel. In addition to being possible, a plurality of data broadcasting programs can be selected and received by the decoding device.

According to the twelfth and fourteenth aspects of the present invention, the data broadcasting data can be time-divided and each data can be AM-transmitted by different channels. In each channel, the data area occupying the video area can be transmitted. In addition, the data broadcasting data received by the relay device can be transmitted to the decoding device without time delay due to storage in the storage means.

According to the fifteenth and seventeenth aspects of the invention, since the video signal line of one channel is used for multiplexing a plurality of data broadcasting data, a plurality of data broadcasting data are simultaneously transmitted by AM. be able to.

[0039]

EXAMPLES Examples will be described with reference to the drawings. FIG. 1 is a block diagram showing a data broadcasting AM transmission system according to an embodiment of the present invention.

First, the configuration of FIG. 1 will be described. This system is a headend that receives satellite broadcasting, multiplexes various pay-related information into a vertical blanking interval (VBI) of a video signal, and multiplexes data broadcasting data into a VBI and a video signal line of a video signal and performs AM modulation. 30 and a receiving terminal 50 for selecting and demodulating the AM signal, separating and decoding the VBI multiplex signal for descrambling, and extracting and reproducing the VBI multiplex signal and the multiplex signal of the video signal line.

The head end 30 is a BS / CS tuner 31 that receives and demodulates a satellite system signal which is a first transmission system.
And the FM detection output 222 and the bit stream output 202 from the tuner are input to descramble audio signal 2
03, scramble-related information (information signal for descramble) 204 and scramble decoding unit 32 for taking out scrambled video signal 205, and data broadcast data 206 from the bit stream output 202.
A data extraction processing circuit 33 for extracting and reproducing the data, a data multiplexing circuit 34 for packetizing the scramble-related information 204 and the data broadcast data 206 and multiplexing them on the VBI specific line and the video line of the scrambled video signal, and the data multiplexed video signal 207 and descramble voice signal 20
AM remodulation circuit 3 for remodulating 3 and 3 with AM (amplitude modulation)
And 5 are provided.

Further, the receiving terminal 50 has the head end 30.
From the CATV tuner 36 that receives the AM signal 208 transmitted from the second transmission system via the co-listening cable 47.
And a video demodulation circuit 37 for AM demodulating this tuner output
And the video demodulation output 209 is input, and left (L), right (R)
Demodulation circuit 38 for demodulating the audio signals 210 and 211 of
An A / D converter 39 which inputs the video demodulation output 209 and converts it into a digital signal, a video descramble processing circuit 40 which descrambles the digitally converted video signal 212, and this descramble video signal 213.
To analog signal, packet extraction circuit 42 for extracting packet signal 214 multiplexed in video demodulation output 209, scramble-related for extracting scramble-related information packet 215 included in packet signal 214 An information packet processing circuit 43,
A security processing circuit 44 for extracting security information 216 for unlocking the scramble key based on the scramble-related information packet 215, and a data packet processing circuit 46 for extracting and reproducing a data broadcast data packet from the packet signal 219 from the packet extraction circuit 42. , A message multiplexing circuit 45 for multiplexing the message signal 217 on the line portion of the video signal line where the data broadcasting data was multiplexed.

Next, the operation of FIG. 1 will be described. Tuner 3
The bit stream signal 202 demodulated by 1 is input to the descramble decoding unit 32 and simultaneously to the data extraction processing circuit 33. Data extraction circuit 33
Then, of the input signal 201, the data of the area used for data broadcasting is extracted here and reproduced as data. If the data is scrambled, the relevant information is also extracted here. The extracted data 206 is packetized by the data multiplexing circuit 34 (FIG. 2 shows the packet data multiplexed with the video signal), and then the multiplex line (17, 19, 280, 282H) of the scramble-related information 204. It is multiplexed on the VBI and horizontal line of the video signals other than. Further, since it is used for identification of the data multiplex line in the receiving terminal 50,
Information such as in which line the data is multiplexed is also packetized and multiplexed in the video signal line. The scrambled video signal 207 in which these data are multiplexed is AM-modulated by the AM re-modulation circuit 35 at the same time as the descrambled audio signal 203 and transmitted as an AM signal 208 to each terminal 50.

In the receiving terminal 50, the signal received by the CATV tuner 36 is demodulated by the video demodulation circuit 37, and then the packet extraction circuit 42 extracts the scramble-related information 214 and the data broadcast data 219. The scramble-related information 214 is used to descramble the video signal. The data broadcast data 219 is reproduced by the data packet processing circuit 46 and output as data 220 to the outside. Note that as another example of the receiving terminal, a device that outputs audio / video using the data broadcast data 220 and a function that performs a descrambling process when the data broadcast data is scrambled can be considered.

Here, if the video signal after the data is extracted is output as it is, the data portion is displayed on the screen. In the present embodiment, the data multiplexing circuit 34 of the headend 30 transmits information on which video signal line the data is multiplexed in packets, and the packet signal 221 is the data packet of the packet extracting circuit 42. In addition to being used at the time of extraction, the information 221 is given to the message multiplexing circuit 45 so that a message indicating that it is being used in data broadcasting is displayed in the data multiplexed portion of the video screen.

The above system will be described by taking as an example the case of transmitting data broadcasting (A mode, stereo) data using an independent data area in satellite broadcasting. in this case,
The transmission capacity of the independent data area is 480 kb / s, and the data is sent in 288-bit packets. In Figure 2,
The packet data multiplexed with the video signal in this proposal is shown. The header part has 16 bits of bit synchronization code (CR), 8 bits of byte synchronization code (FC), and the others have 272 bits as a data area. The first 8 bits of this 272-bit data area are type identification (SS
I), which is used to identify program information, control information, individual information, and message information. Therefore, in the 272-bit data area, the type identification is 8 bits, the packet data is 182 bits, and the error correction code (redundant bit) is 82 bits.
It has become a bit. That is, in the packet sent by satellite broadcasting, only the header part is changed and superimposed on the video signal for transmission. Therefore, when calculating how many lines are needed per field to transmit the data broadcasting data using the independent data area, it becomes 480 kb / 288b / 60 fields = 27.78 lines.

In addition to the above lines, considering a line in which a vertical synchronization section, scramble-related information, and an information packet indicating a multiplex line are multiplexed, the screen of the channel for transmitting the data broadcasting data is as shown in FIG. It becomes the form (in the figure, the total of the upper and lower data areas of the screen is 41 lines). FIG. 3 shows areas of video signals and data signals in one field. In the example of FIG.
As shown by the diagonal lines, data areas are provided above and below the screen, and a message indicating that the data broadcasting is being used is displayed in that area. In this case, the image area is 84.0%
Will be reduced to.

Next, an embodiment in which the above-mentioned reduction of the image area is improved will be described.

FIG. 4 shows a data broadcast A according to another embodiment of the present invention.
It is a block diagram which shows an M transmission system.

First, regarding the configuration of FIG. 4, parts different from those of FIG. 1 will be described, and description of the other same parts will be omitted. The data extraction processing circuit 48 has a function of inputting the bit stream output 202 from the BS / CS tuner 31, identifying the program content of the data broadcast data, and selecting / extracting only the necessary data and reproducing it. Also,
The memory circuit 49 temporarily stores the data broadcast data 206a extracted and reproduced by the data extraction processing circuit 48,
It has a function of transferring to the data multiplexing circuit 34. Since the configuration of the receiving terminal 50 is exactly the same as that of FIG. 1,
Description is omitted.

Next, the operation of FIG. 4 will be described. Tuner 3
The bit stream signal 202 demodulated by 1 is input to the descramble decoding unit 32 and at the same time is input to the data extraction processing circuit 48. Data extraction circuit 48
Then, the data broadcast program is identified from the input signal 201, and only the program data designated in advance is extracted and reproduced as data. If the data is scrambled, the relevant information is also extracted here. The reproduced data 206a is stored in the memory circuit 4 in the headend.
9 is temporarily stored. This stored data 206b
Is packetized by the data multiplexing circuit 34, and then multiplexed lines (17, 19, 28) of the scramble-related information 204.
0,282H) and data are multiplexed on VBI and video lines. As in the embodiment of FIG. 1, the terminal 50 is used for identifying the data multiplex line and the like, so that information such as which line the data is multiplexed on is packetized and multiplexed on the video signal line. The scrambled video signal 207 in which these data are multiplexed is AM-modulated by the AM re-modulation circuit 35 at the same time as the descrambled audio signal 203, and is transmitted to each receiving terminal 50 as an AM signal 208. The structure and operation of the terminal 50 are similar to those of the embodiment shown in FIG.

As described above, the transmission amount can be reduced and the data area occupied in the video area can be reduced as compared with the case where all the data broadcasting data is transmitted to the terminal side as in the embodiment of FIG. Can be reduced.

FIG. 5 shows a data broadcast A according to another embodiment of the present invention.
It is a block diagram which shows an M transmission system.

In the embodiment of FIG. 5, a plurality of headends 3
Facilities having 0A, 30B, 30C, ... Will be described. Of these headends, the headend 30
Only A has a function of receiving and reproducing the data broadcast, and the data broadcast data is transferred from the head end 30A to the inside of the head end 30A and other head ends 30B, 30C ,. To do. Head end 30A and other head ends 30B, 30C, ...
Transmits the data of each program to the receiving terminal (not shown) after being multiplexed on the video line of the channel corresponding to each headend.

First, regarding the configuration of FIG. 5, parts different from those of FIG. 1 will be described, and description of the other same parts will be omitted. The data extraction processing circuit 51 has a function of inputting the bit stream output 202 from the BS / CS tuner 31, identifying the program content of the data broadcast data, and extracting and reproducing the data for each program. Further, the data transfer circuit 52 uses the head end 3 to which the data reproduced by the data extraction processing circuit 51 is assigned for each program.
It has a function of transferring to the inside of 0A, 30B, 30C, .... The memory circuit 49 temporarily stores one program data 206a from the transfer circuit 52, and then stores the program data 206a.
4 has the function of transferring. The configuration of the receiving terminal has a means for selecting the channel of the AM signal corresponding to each headend, and the terminal 50 shown in the embodiment of FIG.
Is the same as

Next, the operation of FIG. 5 will be described. Tuner 3
The bit stream signal 202 demodulated by 1 is input to the descramble decoding unit 32 and simultaneously to the data extraction processing circuit 51. Data extraction circuit 51
Then, a data broadcast program is identified from the input signal 201, and data extraction / reproduction processing is performed for each program. The data of each program is sent to the data transfer circuit 52, from which the headend 30A assigned to each program is assigned.
And data is transferred to the other headends 30B, 30C, .... The data 206a transferred to the inside of the head end 30A is temporarily stored in the memory circuit 49. The stored data 206b is packetized by the data multiplexing circuit 34 and then VBI other than the multiplexing lines (17, 19, 280, 282H) of the scramble-related information 204.
And data is multiplexed on the video line. As in the case of the embodiment of FIG. 1, in order to identify the data multiplex line in the terminal and the like, information such as which line the data is multiplexed on is packetized and multiplexed on the video signal line. The scrambled video signal 207 in which these data are multiplexed is AM-modulated by the AM re-modulation circuit 35 at the same time as the descrambled audio signal 203, and transmitted as an AM signal 208 to each receiving terminal. That is, the program data 206a transferred to the inside of the head end 30A is temporarily stored in the memory circuit 49, then multiplexed on the video line of the channel of the head end 30A and transferred to the receiving terminal (not shown).

The program data 309a transferred to the head end 30B is temporarily stored in the memory circuit 49a. The stored data 309b is packetized by the data multiplexing circuit 34 and then VB other than the multiplex lines (17, 19, 280, 282H) of the scramble-related information 304.
Data is multiplexed on the I and video lines. As in the case of the embodiment of FIG. 1, in order to identify the data multiplex line in the terminal and the like, information such as which line the data is multiplexed on is packetized and multiplexed on the video signal line. A scrambled video signal 307 in which these data are multiplexed is AM-modulated by the AM remodulation circuit 35 at the same time as the descrambled audio signal 303, and is transmitted to each receiving terminal as an AM signal 308. That is, the data 309a transferred to the head end 30B is temporarily stored in the memory circuit 49a, then multiplexed on the video line of the channel of the head end 30B and transferred to the receiving terminal (not shown).

The same applies to the operations of the head ends 30C, 30D, ....

The receiving terminal is composed of a plurality of headends 3.
0A, 30B, ... Inputting the AM signals 208, 308, ... Of the channels corresponding to the respective headends and providing a means for selecting that one channel. The AM signal of the selected one channel is It is adapted to be supplied to a CATV tuner of a terminal configured similarly to the embodiment of FIG. Therefore, the structure of the receiving terminal is the same as that of the terminal 50 shown in the embodiment of FIG. 1 except the means for selecting the channel corresponding to each head end, and the operation is also the same.

As described above, the data broadcasting area occupying the video area for each channel can be reduced, and the terminal can receive a plurality of data broadcasting programs.

FIG. 6 shows a data broadcast A according to another embodiment of the present invention.
It is a block diagram which shows an M transmission system.

In the embodiment of FIG. 6, a co-listening facility having a plurality of (two in the figure) head ends 30A and 30B will be described. Of these headends, only the headend 30A has a function of receiving and reproducing the data broadcast, and the data broadcast data is transmitted from the headend 30A to the inside of the headend 30A and other headends 30B in a time division manner. Try to transfer. The head end 30A and the other head end 30B collect the time-divided data,
The video lines of the channels corresponding to the respective headends are multiplexed and transferred to the terminal 50A.

First, regarding the configuration of FIG. 6, FIG. 1 and FIG.
The description will be omitted for the same components other than the above. The data extraction processing circuit 53 is
Bitstream output 202 from the / CS tuner 31
Input, and the data broadcast data is extracted, reproduced, and time-divided (here, two data are time-divided and output). Further, the data transfer circuit 54 uses the data time-divided by the data extraction processing circuit 53 for each head end 30.
It has a function of transferring to the inside of A and 30B. The data multiplexing circuit 34 is a circuit for multiplexing one of the time-division data 206c from the data transfer circuit 54 with the scramble-related information 204 on the VBI and the video line of the scrambled video signal 205. This is a circuit for multiplexing the other time division data 309b from the transfer circuit 54 together with the scramble related information 304 on the VBI of the scrambled video signal 305 and the video line. The configuration of FIG. 6 does not have the memory circuit of FIG.

The receiving terminal 50A has two headends 3
It has two CATV tuners 36, 36a for receiving each AM signal 208, 308 from 0A, 30B.
The circuit on the CATV 36 side is similar to the terminal configuration of FIG.
The circuit on the CATV 36a side is configured to extract and reproduce the other time-divided data broadcast data. CATV
In the circuit on the tuner 36a side, the received AM signal 308
Is subjected to AM demodulation by the video demodulation circuit 37a and then supplied to the packet processing circuit 55. The packet extraction circuit 55 has a function of extracting the data packet multiplexed on the line of the video signal. The data processing circuit 56 has a function of reproducing the packet of the data broadcast data which is time-divided by the head ends 30A and 30B in synchronization with the above-mentioned time division timing. However, the receiving terminal 50A
In the case where the number of time divisions in the data extraction processing circuit 53 is two or more and the number of headends is two or more, the number of CATV tuners in FIG. It goes without saying that the number of pieces of data combined is two or more.

Next, the operation of FIG. 6 will be described. The bit stream signal 202 demodulated by the tuner 31 is input to the descramble decoding unit 32 and simultaneously to the data extraction processing circuit 53. The data extraction circuit 53 extracts the data broadcast data from the input signal 202, reproduces it, and time-divisionally sends it to the data transfer circuit 54. The reproduction data subjected to the time division processing is transferred to the data multiplexing circuit 34 inside the head end 30A and the data multiplexing circuit 34a of the other head end 30B via the data transfer circuit 54. The time division data 206c transferred to the inside of the head end 30A is stored in the data multiplexing circuit 3
After being packetized in 4, the scramble related information 204
Data is multiplexed on the VBI and video lines other than the multiplex lines (17, 19, 280, 282H). As in the case of the embodiment of FIG. 1, in order to identify the data multiplex line in the terminal and the like, information such as which line the data is multiplexed on is packetized and multiplexed on the video signal line.
A scrambled video signal 207 in which these data are multiplexed
Is simultaneously AM-modulated by the AM re-modulation circuit 35 at the same time as the descrambled voice signal 203 and transmitted as an AM signal 208 to each receiving terminal 50A. That is, head end 3
The data 206a transferred to the inside of 0A is multiplexed on the video line of the channel of the head end 30A and transferred to the receiving terminal 50A.

The time division data 309b transferred to the head end 30B is packetized by the data multiplexing circuit 34a, and then the scrambling related information 304 multiplexed line (1
7, 19, 280, 282H) and data are multiplexed on the VBI and the video line. As in the case of the embodiment of FIG. 1, in order to identify the data multiplex line in the terminal and the like, information such as which line the data is multiplexed on is packetized and multiplexed on the video signal line. The scrambled video signal 307 in which these data are multiplexed is descrambled with the audio signal 303 and the AM remodulation circuit 35a.
AM reception is performed by each receiving terminal 50 as an AM signal 308.
Is transmitted to A. That is, the data 309b transferred to the head end 30B is multiplexed on the video line of the channel of the head end 30B and transferred to the receiving terminal 50A.

The transmitted signals 208 and 308 are transmitted to the terminal 5
The channel is selected by a plurality of CATV tuners 36, 36a corresponding to the respective channels in the 0A, and the video demodulation circuits 37, 37a are selected.
After being respectively demodulated by the video signal in the CATV tuner 36, the packet extraction circuit 42 of the channel that selects the video on the CATV tuner 36 side extracts the scramble-related information packet and the data broadcast data packet 214 (206c).
At the TV tuner 36a side, after the video demodulation by the video demodulation circuit 37a, the data extraction data 2 is sent by the packet extraction circuit 55.
Only 33 (309b) is extracted, and the respective packet data 214 and 233 are reproduced by the data processing circuit 56 in synchronization with the time division timing described above.

As described above, it is possible to reduce the data area occupied in the video area by transmitting using a plurality of channels, and the data broadcasting data received by the headend 30A is stored in the memory. It is transmitted to each terminal without delay due to storage in the terminal.

FIG. 7 shows a data broadcast A according to another embodiment of the present invention.
It is a block diagram which shows an M transmission system.

The embodiment shown in FIG. 7 is an embodiment in which the video lines of one channel are exclusively used for data broadcasting. If all lines of the video signal are used for multiplexing data broadcasting data packets, the transmission capacity will be 2643 kb / s.
Becomes On the other hand, the transmission capacity of data broadcasting using all the audio area and independent data area in satellite broadcasting is 1760.
kb / s, AM for multiple data broadcasting data at the same time
It is also possible to transmit.

First, with respect to the configuration of FIG. 7, parts different from those of FIG. 1 will be described, and description of the other same parts will be omitted. The data transfer circuit 57 in the head end 30A has a function of transferring the data broadcast data extracted and reproduced by the data extraction processing circuit 33 to the data broadcast head end 60. Head ends 30B, 30
Similarly, the data transfer circuits 57a and 57b in C, ...
It has a function of transferring the data broadcasting data extracted and reproduced in 3b to the data broadcasting headend 60. In this embodiment, the data extraction processing circuits 33, 33a,
The output of 33b is different from that of FIG.
It is configured not to be transferred to 34a and 34b.

In the data broadcasting head end 60,
The video signal generating circuit 61 is a video signal generating means for multiplexing data broadcasting data. The memory circuit 62 includes the data transfer circuits 5 of the head ends 30A, 30B, 30C, ....
Data broadcasting data 20 from 7, 57a, 57b, ...
6, 306, 406, ... Has a function of temporarily storing. The data multiplexing circuit 63 is a circuit for time-division multiplexing a plurality of data broadcast data stored in the memory circuit 62 on the video signal line from the video signal generating circuit 61.

Next, the operation of FIG. 7 will be described. The bit stream signal 202 demodulated by the tuner 31 at the head end 30A is input to the descramble decoding unit 32 and at the same time, is input to the data extraction processing circuit 33. In the data extraction processing circuit 33, the input signal 20
The data of the area used for data broadcasting out of 2 is extracted here and reproduced as data. If the data is scrambled, the relevant information is also extracted here. The extracted data 206 is transferred to the data broadcasting head end 60 by the data transfer circuit 57. At the same time, in order to identify the data multiplex line on the terminal side and the like, information such as in which line the data is multiplexed is also transferred to the data broadcasting headend 60.

In the data multiplexing circuit 34, the scrambled video signal 207 is AM-modulated by the AM re-modulation circuit 35 at the same time as the descrambled audio signal 203, and the AM signal 2
08 is transmitted to each receiving terminal as television information (video and audio).

In addition, the tuner 3 at the head end 30B
The bit stream signal 302 demodulated in 1a is input to the descramble decoding unit 32a and simultaneously input to the data extraction processing circuit 33a. In the data extraction processing circuit 33a, the data of the area used for data broadcasting is extracted from the input signal 302 here,
Played back as data. If the data is scrambled, the relevant information is also extracted here. The extracted data 306 is the data transfer circuit 57a.
Is transferred to the data broadcasting head end 60. At the same time, in order to identify the data multiplex line on the terminal side and the like, information such as in which line the data is multiplexed is also transferred to the data broadcasting headend 60.

In the data multiplexing circuit 34a, the scrambled video signal 307 is the descrambled audio signal 303.
At the same time, it is AM-modulated by the AM re-modulation circuit 35a and transmitted as an AM signal 308 to each receiving terminal as television information (video and audio).

Similarly, in the head end 30C, the bit stream signal 402 demodulated by the tuner 31b is input to the descramble decoding unit 32b and simultaneously to the data extraction processing circuit 33b. In the data extraction processing circuit 33b, the data of the area used for data broadcasting is extracted here from the input signal 402 and reproduced as data. If the data is scrambled, the relevant information is also extracted here. The extracted data 406 is the data transfer circuit 5
7b, the data is transferred to the data broadcasting head end 60. At the same time, in order to identify the data multiplex line on the terminal side and the like, information such as in which line the data is multiplexed is also transferred to the data broadcasting headend 60.

In the data multiplexing circuit 34b, the scrambled video signal 407 is descrambled with the audio signal 403.
At the same time, it is AM-modulated by the AM re-modulation circuit 35b and transmitted as an AM signal 408 to each receiving terminal as television information (video and audio).

Further, the head ends 30D, 30E, ...
A large number may be arranged.

In FIG. 7, each head end 30A,
The data broadcasting data extracted by 30B, 30C, ... Are transferred to the data broadcasting head end 60, temporarily stored in the memory circuit 62, and then supplied to the data multiplexing circuit 63, where the video signal generating circuit 61 The time-division multiplexed data is time-division multiplexed on the created video signal line, and the time-division multiplexed data is further AM-modulated by the AM modulation circuit 64.
3 is transmitted. By doing so, all the lines of the video can be used for multiplexing the data broadcast data packet, and it is also possible to simultaneously transmit a plurality of data broadcast data by AM.

As the receiving terminal, the headend 3
AM signals 208, 308, 408 of television information (video and audio) from 0A, 30B, 30C, ....
A CATV tuner capable of selecting and inputting any one of AM signals, and a second CATV tuner inputting an AM signal 513 of data broadcasting data from the data broadcasting head end 60 Moreover, after demodulating the output of the second CATV tuner, the plurality of data broadcast data in the demodulated output are separated at the time division timing described above, and the desired data broadcast data is extracted and reproduced. The terminal device may be used.

[0082]

As described above, according to the present invention, by multiplexing the data broadcasting data on the video signal line,
It is possible to perform AM transmission of data of data broadcasting.

[Brief description of drawings]

FIG. 1 is a block diagram showing a data broadcasting AM transmission system according to an embodiment of the present invention.

FIG. 2 is a diagram showing packet data multiplexed on a video signal.

FIG. 3 is a diagram showing areas of a video signal and a data signal in one field.

FIG. 4 is a block diagram showing a data broadcasting AM transmission system according to another embodiment of the present invention.

FIG. 5 is a block diagram showing a data broadcasting AM transmission system according to another embodiment of the present invention.

FIG. 6 is a block diagram showing a data broadcasting AM transmission system according to another embodiment of the present invention.

FIG. 7 is a block diagram showing a data broadcasting AM transmission system according to another embodiment of the present invention.

FIG. 8 is a block diagram showing a pay satellite broadcasting system.

FIG. 9 is a block diagram showing a conventional data broadcasting AM transmission system.

[Explanation of symbols]

30, 30A, 30B, ... head end (relay device) 31, 31a, 31b, ... BS / CS tuner (demodulation means) 32, 32a, 32b, ... scramble decoding unit 33, 33a, 33b, ... data Extraction circuit (extraction means) 34, 34a, 34b, ... Data multiplexing circuit (packetizing means and data multiplexing means) 35, 35a, 35b, ... AM remodulation circuit (AM remodulation means) 36 ... CATV tuner 37 ... Video demodulation circuits 36 and 37 ... Demodulation means 42 ... Packet extraction circuit (packet extraction means) 46 ... Data packet processing circuit (data reproduction means) 49, 49a, 49b, ... Memory circuit (storage means) 50, 50A ... Reception terminal (Decryption device)

Continuation of front page (51) Int.Cl. ⁶ Identification code Office reference number FI Technical display area H04N 7/20 H04B 1/16 G // H04B 1/16

Claims (17)

[Claims] Claim: What is claimed is: 1. Demodulation means for receiving and demodulating a television information signal transmitted via a first transmission system, and extraction means for extracting data broadcasting data from the demodulated television information signal. Packetizing means for packetizing the data broadcasting data, and data multiplexing means for multiplexing the packetized data broadcasting data on the vertical blanking period of the video signal in the television information signal and / or on the horizontal line of the video signal An AM remodulation means for remodulating the data-multiplexed video signal into an AM signal and sending the AM signal to the second transmission system. 2. Demodulation means for receiving and demodulating a television information signal transmitted via a first transmission system, and the program content of the data broadcast is identified from the demodulated television information signal, and the data of the required program is identified. Extracting means for extracting only the data broadcasting data, storage means for temporarily storing the extracted data broadcasting data, packetizing means for packetizing the stored program data, and the packetized program data for the television. Vertical blanking period of video signal in John information signal and /
Or a data multiplexing means for multiplexing on the horizontal line of the video signal, and an AM remodulating means for remodulating the data multiplexed video signal into an AM signal and sending it to the second transmission system. Relay device. 3. A demodulation means for receiving and demodulating an AM signal transmitted from the repeater according to claim 1 or 2 via a second transmission system, and a data broadcast data packet from the demodulated video signal. A decoding device comprising: a packet extracting unit for extracting; and a unit for reproducing data from the extracted data broadcast data packet. 4. A demodulation means for receiving and demodulating an AM signal transmitted from the relay device according to claim 1 or 2 via a second transmission system, and a data broadcast data packet from the demodulated video signal. Packet extraction means for extracting, means for reproducing data from the extracted data broadcast data packet, and a portion where the data packet of the video signal is multiplexed are of a predetermined level to indicate the data broadcast use area. A decoding device comprising means for replacing with a signal or for multiplexing a message signal for displaying a message in the area. 5. A television information signal transmitted via a first transmission system is received and demodulated, and data broadcasting data is extracted from this demodulated television information signal and packetized, and then this packet data is Vertical blanking period of video signal in the television information signal and /
Or, it is multiplexed on the horizontal line of the video signal, and the video signal multiplexed with this data is re-modulated into an AM signal and transmitted.
Transmitted to the decoding device via the second transmission system, the decoding device received and demodulated the AM signal transmitted via the second transmission system, and extracted the data broadcast data packet from the demodulated video signal. After that, the data broadcasting method is characterized in that the packet data is reproduced. 6. A television information signal transmitted via a first transmission system is received and demodulated, and data broadcasting data is extracted from this demodulated television information signal and packetized, and then this packet data is converted. Vertical blanking period of video signal in the television information signal and /
Or, it is multiplexed on the horizontal line of the video signal, and the video signal multiplexed with this data is re-modulated into an AM signal and transmitted.
Transmitted to the decoding device via the second transmission system, the decoding device received and demodulated the AM signal transmitted via the second transmission system, and extracted the data broadcast data packet from the demodulated video signal. After that, the packet data is reproduced, and the portion of the video signal in which the data packet is multiplexed is replaced with a signal of a predetermined level to indicate that it is a data broadcasting use area, or for displaying a message in the area. A data broadcasting method characterized by multiplexing the message signals of. 7. A television information signal transmitted via a first transmission system is received and demodulated, and the program content of the data broadcast is identified from the demodulated television information signal, and only the data of the required program is identified. After extracting
After being temporarily stored and packetized, this packet data is multiplexed on the vertical blanking period of the video signal in the television information signal and / or on the horizontal line of the video signal, and the data multiplexed video signal is AM. The signal is re-modulated and transmitted, and transmitted to the decoding device via the second transmission system. The decoding device receives and demodulates the AM signal transmitted via the second transmission system, and the demodulated video A data broadcasting method comprising extracting a data broadcasting data packet from a signal and then reproducing the packet data. 8. A television information signal transmitted via the first transmission system is received and demodulated, and the program content of the data broadcast is identified from the demodulated television information signal, and only the data of the required program is identified. After extracting
After being temporarily stored and packetized, this packet data is multiplexed on the vertical blanking period of the video signal in the television information signal and / or on the horizontal line of the video signal, and the data multiplexed video signal is AM. The signal is re-modulated and transmitted, and transmitted to the decoding device via the second transmission system. The decoding device receives and demodulates the AM signal transmitted via the second transmission system, and the demodulated video After extracting the data broadcast data packet from the signal, the packet data is reproduced, and the portion of the video signal in which the data packet is multiplexed is replaced with a signal of a predetermined level to indicate the data broadcast use area. Alternatively, a data broadcasting method characterized by multiplexing a message signal for displaying a message in the area. 9. A plurality of relay devices, the first of which is provided.
The relay device of, the demodulating means for receiving and demodulating the television information signal including the data broadcast data transmitted via the first transmission system, and the program content of the data broadcast are identified from the demodulated television information signal, Extraction means for extracting data for each program, data transfer means for transferring the extracted data broadcast data of each program so as to correspond to the plurality of relay devices assigned for each program, and the data transfer means from this transfer means. Storage means for temporarily storing one program data, packetizing means for packetizing the stored program data, and vertical blanking period of the video signal in the television information signal for the packetized program data. as well as/
Or a data multiplexing means for multiplexing on a horizontal line of the video signal, and an AM remodulating means for remodulating the data multiplexed video signal into an AM signal and sending it to the second transmission system. The other relay device of the relay devices temporarily stores the data for each program from the data transfer means of the first relay device, and packetizes the stored program data. Packetizing means, data multiplexing means for multiplexing the packetized program data on the vertical blanking period of the video signal of the relay device and / or on the horizontal line of the video signal, and the data multiplexed video signal An AM remodulation means for remodulating a signal and sending it to the second transmission system. 10. Selection means for selecting an AM signal transmitted from a plurality of repeaters according to claim 9 via a second transmission system, demodulation means for receiving and demodulating the selected AM signal, A decoding device comprising: a packet extracting means for extracting a data broadcasting data packet from the demodulated video signal; and a means for reproducing data from the extracted data broadcasting data packet. 11. A plurality of relay devices are provided, one of which relay device receives and demodulates a television information signal transmitted via a first transmission system, and data from the demodulated television information signal. Identify the program content of the broadcast,
After extracting data for each program, transferring the extracted data broadcast data of each program to the plurality of relay devices assigned to each program, temporarily storing the program data in each relay device, and packetizing the data. , The packet data is multiplexed on the vertical blanking period of the video signal of the television information signal and / or on the horizontal line of the video signal in each relay device, and the data multiplexed video signal is AM.
The signal is re-modulated and transmitted to a plurality of channels corresponding to each relay device, and is transmitted to a decoding device via a second transmission system. In the decoding device, a plurality of channels transmitted via the second transmission system. Receive and demodulate one selected AM signal,
A data broadcasting method comprising extracting a data broadcasting data packet from the demodulated video signal and then reproducing the packet data. 12. A demodulation means for receiving and demodulating a television information signal including data broadcast data transmitted via a first transmission system, the demodulation means comprising a plurality of relay devices, Extracting means for extracting data broadcast data from the generated television information signal and outputting the extracted data in a time division manner, and a data transfer for transferring each of the time division data so as to correspond to the plurality of relay devices. Means, packetizing means for packetizing one data output from the transferring means, and the packetized data for vertical blanking period of the video signal in the television information signal and / or horizontal of the video signal. Data multiplexing means for multiplexing on the line and AM remodulation for remodulating the data multiplexed video signal into an AM signal and sending it to the second transmission system. And a packetizing unit that packetizes the data output from the data transfer unit of the first relaying device, and the other relaying device of the plurality of relaying devices. Data that is multiplexed on the vertical blanking period of the video signal of the repeater and / or on the horizontal line of the video signal, and the second transmission by remodulating the data multiplexed video signal into an AM signal. A repeater comprising an AM remodulation means for sending to the system. 13. The relay device according to claim 12, further comprising:
A plurality of demodulation means for receiving and demodulating a plurality of AM signals transmitted via the transmission system, a plurality of packet extraction means for respectively extracting data broadcast data packets from these demodulated video signals, and a plurality of these A decoding device, comprising means for reproducing data from the extracted data broadcast data packet in synchronization with the time-divisional timing. 14. A plurality of relay devices are provided, and one of the relay devices receives and demodulates a television information signal transmitted via a first transmission system, and data is demodulated from the demodulated television information signal. The broadcast data is extracted, the extracted data broadcast data is time-divisionally transferred to the plurality of relay devices, the time-division data is packetized by each relay device, and this packet data is transferred to each of the relay devices. A plurality of channels corresponding to each relay device by multiplexing on the vertical blanking period of the video signal of the television information signal and / or on the horizontal line of the video signal, and further remodulating the data multiplexed video signal into an AM signal. And transmits it to the decoding device via the second transmission system. In the decoding device, a plurality of AM signals of a plurality of channels transmitted via the second transmission system are transmitted. Receiving and demodulating using the demodulating means, extracting a plurality of time division data packets from these demodulated video signals, and reproducing the plurality of packet data in synchronization with the time division timing. And data broadcasting method. 15. Consists of a plurality of relay devices, one of which is
One relay device as a first relay device, a plurality of other relay devices other than the first relay device as a second relay device,
The second relay device can input a plurality of television information signals including data broadcast data, and the first relay device can input a plurality of data broadcast data extracted by the second relay device. Each of the relay devices forming the second relay device includes demodulation means for receiving and demodulating a television information signal including data broadcast data transmitted via the first transmission system, and demodulating means. And a data transfer unit for transferring the extracted data broadcast data to the first relay device, wherein the first relay device comprises: A storage unit for inputting and temporarily storing a plurality of data broadcast data from each relay device transferred from the transfer unit, and a packet storing the plurality of stored data broadcast data. Packetizing means for converting the video signal, video signal generating means for generating a video signal, and a plurality of data broadcasting data packetized by the packetizing means for vertical blanking period of the video signal from the video signal generating means, And / or data re-multiplexing means for time-division multiplexing on the horizontal line of the video signal, and AM re-modulating means for re-modulating the data-multiplexed video signal into an AM signal and sending it to the second transmission system. A relay device characterized by. 16. A relay device according to claim 15, further comprising:
Demodulation means for receiving and demodulating an AM signal transmitted via the transmission system of, and a desired data broadcast data packet from a plurality of data broadcast data packets included in the demodulated video signal,
A decoding device comprising: a packet extracting means for separating and extracting at the time division timing; and means for reproducing data from the extracted data broadcast data packet. 17. A relay device comprising a plurality of relay devices, one of which is a first relay device, and a plurality of relay devices other than the first relay device being a second relay device, and the second relay device. Of the above relay device can input a plurality of television information signals including data broadcast data, and the first relay device can input a plurality of data broadcast data extracted by the second relay device. In each of the relay devices forming the second relay device, the television information signal including the data broadcast data transmitted via the first transmission system is received and demodulated, and the demodulated television information signal is received. Data broadcast data is extracted from the relay device, transferred to the first relay device, and the first relay device receives a plurality of data broadcast data transferred from each relay device of the second relay device, and temporarily Remember Then, it is packetized and time-division multiplexed on the vertical blanking period of the video signal and / or on the horizontal line of the video signal created by the video signal generating means, and the multiplexed data is re-modulated into an AM signal to generate a second signal. The decoding device receives and demodulates the AM signal transmitted via the second transmission system, and outputs the desired data broadcasting data packet from the plurality of data broadcasting data packets included in the demodulated video signal. ,
A data broadcasting method comprising separating and extracting at the time division timing, and reproducing data from the extracted data broadcasting data packet.