JPH11298427A - Multi channel broadcasting device and its method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To quickly locate an abnormal position even in a multi channel broadcasting by providing a monitoring means which establishes correspondence relation between transmission video and receiving video, also divides them and shows video data of plural systems at the same time. SOLUTION: In a monitor system 80, broadcast waves supplied to an antenna 21 are divided and inputted to a monitoring part 81, and programs transmitted from each chain 44 are respectively received in an IRD 84. Video data outputted from the IRD 84 is supplied to a monitor 86 through a selection circuit 85. Broadcast waves made downlink from a satellite 22 through an antenna 82 are inputted to the part 81 and a program that is respectively transmitted from each chain 44 is received in the IRD 83. Video data outputted from the IRD 83 is supplied to the monitor 86 through the circuit 85. In the monitor 86, a display screen is divided vertically and corresponding transmission video and receiving video are divided and simultaneously displayed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a multi-channel broadcasting device and a multi-channel broadcasting method, and can be applied to, for example, a digital satellite broadcasting system. According to the present invention, the transmission image on the input side of the multiplexing unit is made to correspond to the corresponding reception image on the reception side, and the transmission image and the reception image are divided and the video data of a plurality of systems are displayed simultaneously. In addition, it is possible to quickly identify an abnormal part in multi-channel broadcasting.

[0002]

2. Description of the Related Art Conventionally, in a digital satellite broadcasting system, a plurality of streams of video data and audio data are time-division multiplexed by transport stream packets to generate multiplexed data. Data is frequency-multiplexed and transmitted, so that many services can be provided.

That is, as shown in FIG. 6, in a digital satellite broadcasting system, a frequency band usable for broadcasting is divided into predetermined frequency bands BW, and a transponder is set in each frequency band. In one transponder, for example, broadcasting of six channels is assigned, so that, for example, in broadcasting by 16 transponders, a service of 96 channels can be provided.

[0004]

However, this type of digital satellite broadcasting system has a feature that the system configuration is more complicated than that of the case of terrestrial television broadcasting. That is, in terrestrial television broadcasting, a program to be broadcast is simply modulated into a television broadcasting wave and transmitted.

On the other hand, in a digital satellite broadcasting system, programs to be broadcast are temporarily stored in a server or the like, and a management schedule is set so that a large number of channels can be broadcast simultaneously. After data compression of each channel, time division multiplexing and frequency multiplexing are performed, and broadcast via a satellite.

In a digital satellite broadcasting system having such a complicated system configuration, if an abnormality can be found quickly when an abnormality occurs, the operation of the digital satellite broadcasting system is greatly simplified. Can be. In addition, it is considered that the abnormality can be promptly dealt with and the abnormality can be repaired in a short time.

[0007] The present invention has been made in view of the above points, and an object of the present invention is to propose a multi-channel broadcasting apparatus and a multi-channel broadcasting method capable of quickly specifying an abnormal portion even in multi-channel broadcasting. .

[0008]

In order to solve the above-mentioned problems, the present invention is applied to a multi-channel broadcasting apparatus and a multi-channel broadcasting method. And the transmitted video and the received video are divided, and at least a plurality of systems of video data of the multi-channel video data are displayed simultaneously.

[0009] The transmission image based on the video data on the input side of the multiplexing means is made to correspond to the reception image based on the corresponding video data on the reception side, and the transmission image and the reception image are separated, and the multi-channel video data is divided. When at least a plurality of systems of video data are displayed at the same time, an abnormal part is characterized by the correspondence between these images. That is, when an abnormality is detected only in the received video corresponding to the transmission video, it can be determined on the input side of the multiplexing means that the video data of the transmission video has already occurred, and this input side is determined as an abnormal part. Can be identified.
Also, when an abnormality is detected only in one received video, since a normal one is present on the input side of the multiplexing means and abnormal after the multiplexing, for example, when an encoder is disposed during this time, An abnormality of the encoder can be determined. Also, no abnormality is detected in the transmitted video,
When an abnormality is detected in all of the received images, the multiplexing unit can determine that the abnormality is at a subsequent stage.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings.

(1-1) Overall Configuration FIG. 2 is a block diagram showing a digital satellite broadcasting system according to this embodiment. In the digital satellite broadcast system 1, a program provider 2 is a subject that provides various services by the digital satellite broadcast system 1, and provides video data, audio data, and the like provided for the service by a video tape recorder 3 and the like. Also, the terminal station 4 provides video data, audio data, and the like that constitute a service such as a news program.
Further, information such as a broadcast schedule of these services is transmitted via the terminal 2A.

The baseband system 5 accumulates services provided by various program providers 2 and sends them out according to a broadcast schedule. That is, in the baseband system 5, the cart 6 holds a large number of recording media and records services provided by the program provider 2 on each recording media. The cart 6 reproduces each recording medium under the control of the controller 7 and outputs video data, audio data, and the like recorded on each recording medium. The server 8 temporarily holds the data sent from the cart 6 and sends the data under the control of the controller 7. Router 9 is server 8
And the various data D1 input from the terminal station 4 of the program provider 2 to the subsequent uplink system 11. The controller 7 is configured by a computer, and controls the operation of the entire baseband system 5 according to a broadcast schedule set by the scheduler 12.

The uplink system 11 encodes various data D1 output from the baseband system 5, generates time-division multiplexed data to generate multiplexed data, and frequency-multiplexes the multiplexed data to perform uplink. Link. That is, in the uplink system 11,
The encoder (ENC) 13 encodes various data D1 output from the baseband system 5 under the control of the controller 15 and outputs encoded data.

A multiplexer (MUX) 16 performs time-division multiplexing of the encoded data under the control of the controller 15 to generate multiplexed data. At this time, the multiplexer 16 scrambles the desired transport stream packet by the built-in scrambler 17 and outputs the packet. Also, program specification information PSI (Program Specif) required for processing each transport stream packet
ic information), and generates and multiplexes packets such as decoding information ECM of the program itself and reception contract information EMM. Further, the electronic program guide E output from the EPG generation circuit 19
Multiplex PG (Electronic Program Guide). Further, at this time, the multiplexer (MUX) 16 separates the decoding information ECM of the program itself and the reception contract information EMM separately.
Multiplex by scrambling.

Here, the program specification information PSI
Is the data of the program selection criteria, the frequency of the transponder, the packet I of the transport stream packet
D identifies the packet of each service. The decryption information ECM of the program itself is composed of scrambled key data and the like, and the reception contract information EMM is composed of data necessary for obtaining key data from the decryption information ECM of the program itself.

The scrambler 17 comprises a series connection circuit of flip-flops, an exclusive OR circuit for calculating an exclusive OR of an output of a predetermined stage of the series connection circuit and input data, and the like. A predetermined stage output and an exclusive OR circuit output are fed back to the input stage of the serial connection circuit, and at least each bit of the key data is set in each flip-flop at a predetermined period to scramble the input data and output. I do.

The EPG generation circuit 19 includes a scheduler 1
Under the control of 2, the data of the electronic program guide EPG is generated and output. The modulation circuit (MOD) 20 adds an error correction code to the multiplexed data output from the multiplexing device 16 and then applies QPSK (Quadrature Phase Shift Keying).
Modulates and outputs a modulated signal. Uplink system 1
1 generates modulation signals by the plurality of processing circuits in this way, and frequency-multiplexes the plurality of modulation signals. Further, this frequency multiplexed signal is
Uplink to the satellite 22 more.

The satellite 22 frequency-converts the uplink broadcast wave and performs downlink.

The customer viewing permission system 23 is provided for each user who watches this digital satellite broadcasting system.
An IC card 24 is issued, and the reception contract information EMM can be obtained by the IC card 24. That is, in the customer viewing permission system 23, the EMM processor 2
5 generates data of the reception contract information EMM and sends it to the uplink system 11. Thereby, the customer viewing permission system 23 distributes the reception contract information EMM to each user via a broadcast wave. Further, the EMM processor 25 generates raw data necessary for receiving the receiving contract information EMM for each user according to the contract contents of each user, and the IC card manager 26 issues the IC card 24 recording the raw data. I do.

IRD (Integrated Receiver Decoder)
27 receives a broadcast wave downlinked from the satellite 22 via the antenna 28, and acquires a desired service from the broadcast wave. At this time, the IRD 27 acquires the reception contract information EMM from the broadcast wave based on the raw data recorded on the IC card 24, and descrambles and receives the contract program according to the reception contract information EMM. Also, the viewing result is notified to the customer management system 29 via a telephone line as necessary.

The customer management system 29 responds according to the receiving contract and according to the viewing result notified from the IRD 27.
Processing such as billing is performed for each user.

The scheduler 12 controls the operation of the entire system in accordance with information on a broadcast schedule provided by the program provider 2. That is, in the scheduler 12, a database (DB) 30 holds information on a broadcast schedule and the like, and the terminal 31 can separately input the information on the broadcast schedule and the like. Broadcast programming system B
DPS (Broadcast Data Processing System) 32
Management data for program transmission is generated in accordance with broadcast schedule information registered in the database 30, and the baseband system 5 and the like are controlled in accordance with the data. Further, the broadcast program organization system 32 generates data necessary for generating a packet of the program specification information PSI and the decoding information ECM of the program itself according to the data, and notifies the multiplexer 16 of the uplink system 11 of the data. In addition, it generates data necessary for generating an electronic program guide EPG,
The generation circuit 19 is notified.

FIG. 3 is a block diagram showing the uplink system 11 together with peripheral components. Here NMD (Netw
The ork management database (40) receives broadcast schedule information from the broadcast program organization system 32, sends data related to the electronic program guide EPG, schedule data, and the like to the bus BUS based on the broadcast schedule information. These data are distributed to the link system 11 and the customer management system 29.

In the uplink system 11, the MR
A C (Master Redundant Controller) 41 is configured by a computer that controls the operation of the entire uplink system 11 and, when notified of an abnormality from a lower-level device, performs processing in the device in which the error has occurred as necessary. Switch to the spare device. About MRC4
1 mainly constitutes the controller 15 described with reference to FIG.

The DLS (Download Server) 42 has an IR
D27 version upgrade data is transmitted. EMM
The repeater (EMM-REP) 43 receives the reception contract information EMM from the customer viewing permission system 23 via the bus BUS.
Of the receiving contract information EMM from this data
Is output to the multiplexer 16.

The chains 44A to 44N have substantially the same configuration. The output data D1 of the baseband system 5 is encoded by an encoding process suitable for broadcasting, and then time-division multiplexed to multiplex the multiplexed data. Generate. Further, the multiplexed data is respectively converted to QPSK (Quadrature
Phase Shift Keying) Modulate and output.

That is, for example, in the chain 44A,
A PGS (Program Guide System) 45 receives data transmitted from the broadcast program organization system 32 via the bus BUS, and generates schedule data of a service transmitted by the chain 44A. Further, in accordance with the schedule data, data necessary for generating a packet of the program specification information PSI is generated, and is notified to the multiplexer 16 via the MCS 50. Similarly, data necessary for generating packets of the decoding information ECM of the program itself is notified to the multiplexer 16 and data necessary for generating the electronic program guide EPG is notified to an EPG-FC (EPG Flow Controller) 46.

Encoder controller (ECS: Encoder Co)
The ntrol subsystem 47 controls the operation of the encoder 13 according to the schedule data created by the PGS 45. Here, the encoder 13 includes a plurality of encoders 13A to 13N, and the encoder control device 47 controls the operation of each of the encoders 13A to 13N. Here, each of the encoders 13A to 13N receives the output data D1 of the baseband system 5, encodes the output data, and outputs the encoded data to the multiplexer 16. In addition, a predetermined encoder among the encoders 13A to 13N has an MPE for video data and audio data.
Encoding processing is performed according to an encoding method specified by G (Moving Picture Experts Group) and output.

The EPG-FC 46 generates data of the electronic program guide EPG from the data necessary for generating the electronic program guide EPG notified from the PGS 45 and outputs the data to the multiplexer 16.

MCS (Multiplexer Control Subsystem)
) 50 controls the operation of the multiplexer 16 according to the schedule data output from the PGS 45. Also M
The CS 50 notifies the multiplexer 16 of the data of the program specification information PSI sent from the PGS 45 and the data of the decoding information ECM of the program itself.

The multiplexing device 16 generates a transport stream packet from the output data of the encoders 13A to 13N and multiplexes the multiplexed data. The multiplexed data D3 obtained by the multiplexing process contains the program specification information P
It inserts packets such as SI packets, decoding information ECM of the scrambled program itself, and reception contract information EMM. In the modulation circuit 20, the multiplexing device 16
QPSK by adding an error correction code to the multiplexed data D3 of
Modulate.

The spare chains 51A and 51B are each configured identically to one of the chains 44A to 44N, and can execute corresponding processing in place of any of the chains 44A to 44N as necessary.

An IF switch (Intermediate Frequ
ency) SW) 53 selectively outputs the QPSK modulation signal output from the spare chain 51A or 51B and the QPSK modulation signal output from the modulation circuit 20.

SRC (Sub Redundant Controller) 53
Constitute a spare device of the PGS45. Up converters 54A to 54N are connected to respective chains 44A to 44
The QPSK modulation signal output from the N
The frequency is converted to a frequency assigned to .about.44N and output. The uplink system 11 adds up the output signals of the up converters 54A to 54N, allocates the chains 44A to 44N to the transponders, frequency-multiplexes the QPSK modulated signal, and performs uplink from the antenna 21.

FIG. 4 is a block diagram showing the IRD.
In the IRD 27, the frequency converter 61 converts the frequency of the broadcast wave obtained from the antenna 28 and outputs the result.
The front end unit 62 selectively processes a broadcast wave by a desired transponder from the output signal of the frequency converter 61, and demodulates and outputs multiplexed data transmitted by the transponder.

That is, in the front end section 62,
The carrier selection unit 63 switches the local oscillation frequency under the control of the host processor 64, and
, A broadcast wave from a desired transponder is selected, and the selected broadcast wave is converted into an intermediate frequency signal and output.

The QPSK demodulation unit 65 detects the intermediate frequency signal output from the carrier selection unit 63, and outputs multiplexed data to which an error correction code has been added. The FEC decoder 66 performs error correction processing (FEC: Forward Error Coding) on the output data of the QPSK demodulation unit 65.
rrection), thereby outputting multiplexed data D3.

Under the control of the host processor 64, the transport section 67 descrambles the multiplexed data as necessary, selects a desired packet,
Thereby, the multiplexed data is demodulated into the original data sequence. That is, in the transport section 67, the descrambling circuit 68 outputs the multiplexed data output from the front end section 62 to the subsequent demultiplexer 69. At this time, under the control of the host processor 64, the multiplexed data is descrambled. And output.

That is, the descrambling circuit 68 is composed of a series connection circuit of flip-flops, an exclusive OR circuit for calculating an exclusive OR of a predetermined stage output of the series connection circuit and input data, and the like. The output of the predetermined stage of the circuit and the output of the exclusive OR circuit are fed back to the input stage of the serial connection circuit, and the receiving contract information EMM can be descrambled by setting elementary data and the like by the IC card 24 in the serial connection circuit. Has been made. In the same circuit configuration, by setting data, raw data, and the like obtained from the reception contract information EMM, key data can be obtained by descrambling the decoding information ECM of the program itself. Is set so that the scramble processing of the contract program can be canceled.

The demultiplexer 69 selects a transport stream packet having a packet ID specified by the host processor 64 and outputs the transport stream packet using the original data sequence. At this time, the demultiplexer 69 outputs the packet ID
Is 0, the program specification information PS
Due to the assignment of I, the information of this packet is notified to the host processor 64. Similarly, it detects packets such as decoding information ECM and reception contract information EMM of the program itself, and notifies the host processor 64 of the information of the packets. The demultiplexer 69
Based on the stream ID added to each packet together with the packet ID, the attribute of the data assigned to each packet is determined and output to the subsequent MPEG decoder 70.

The MPEG decoder 70 processes the output data of the transport section 67 and outputs a video signal SV and an audio signal SA. That is, in the MPEG decoder 70, the EPG processor 71 receives the data allocated to the packet of the EPG from the transport unit 67, notifies the host processor 64 of the data, and controls the data under the control of the host processor 64. More image data is generated. Here, this image data is for generating a display screen for displaying the contents of the electronic program guide. The EPG processor 71 outputs this image data to the NTSC encoder 72.

The video decoder 73 receives the video data from the demultiplexer 69, decodes the video data, and outputs it to the NTSC encoder 72. The audio decoder 74 receives the audio data from the demultiplexer 69, decodes the audio data, and outputs the decoded audio data. Under the control of the host processor 64, the NTSC encoder 72 selectively processes image data output from the EPG processor 71 and video data output from the video decoder 73, and outputs an NTSC video signal SV. The digital-to-analog conversion circuit (D / A) 75 performs a digital-to-analog conversion process on the audio data output from the audio decoder 74 and outputs an audio signal SA.

The IC card 24 stores raw data necessary for descrambling the reception contract information EMM into the host processor 6.
4, and the recorded contents are updated by the host processor 64.

The host processor 64 controls the IRD 27
A control command is issued to the carrier selecting section 63 in response to the operation of an operator (not shown) and a remote commander, and a broadcast wave from a desired transponder is selectively received. Further, the host processor 64 holds the program specification information PSI output from the demultiplexer 69 in a built-in memory. When the version of the program specification information PSI is updated, the held content is stored in the program output from the demultiplexer 69. Update with the specification information PSI.

The host processor 64 issues a control command to the NTSC encoder 72 in response to a user operation, thereby displaying the electronic program guide EPG on-screen and switching the display. Further, the host processor 64 selects a carrier based on the program specification information PSI held in the built-in memory according to a user's selection operation in this on-screen display or according to a channel number input by operating an operation element. The unit 63 issues a control command to the demultiplexer 69. Thus, the host processor 64 switches the packet selected by the demultiplexer 69 and switches the transponder to receive so as to select the program of the channel desired by the user.

When a descrambled program is selected to receive a desired channel in this way, the raw data of the IC card 24 is descrambled by the descramble circuit 6.
8 to release the descrambling of the reception contract information EMM. Further, the data of the reception contract information EMM is received from the demultiplexer 69, and the reception contract information EMM is received.
The decryption information ECM of the program itself is descrambled by the descrambling circuit 68 based on the above data, and the key data KS of the corresponding program is obtained from the decryption information ECM of the program itself. Host processor 6
4 sets the key data KS in the descrambling circuit 68, and thereby descrambles the desired packet.

The reception contract information EM descrambled in this way and input from the demultiplexer 69
M, monitor the version of the decoding information ECM of the program itself,
When this version is updated, the receiving contract information E
The key data of the corresponding program is obtained from the MM and the decoding information ECM of the program itself, and is set in the descramble circuit 68.

On the other hand, if key data cannot be obtained for a desired channel, the host processor 64
Are the NTSC encoder 72 and the audio decoder 74
, A muting instruction is issued, and the output of the demodulation result is stopped. Further, the operation of the NTSC encoder 72 is controlled so that a message indicating that it cannot be received because it has not been contracted is displayed on the monitor device.

The host processor 64 notifies the customer management system 29, for example, via a telephone line when a charge is required for the service currently being received.

(1-2) Monitor System FIG. 1 is a block diagram showing a monitor system of the digital satellite broadcast system 1. The digital satellite broadcasting system 1 monitors the abnormality with the monitor system 80, and when an abnormality occurs, roughly identifies the location where the abnormality has occurred.

The monitor system 80 includes monitor sections 81A to 81N corresponding to the respective transponders. Of these monitor units 81A to 81N,
The monitor unit 81A, which is in charge of the first chain 44A, receives the broadcast wave downlinked from the satellite 22 by the antenna 82 and inputs the broadcast wave to the IRDs 83A to 83N.

The IRDs 83A to 83N have the same configuration as the IRD 27 described above with reference to FIG. 4, except that the IRDs 83A to 83N can receive programs regardless of the presence or absence of the scramble processing. Each of the IRDs 83A to 83N has an encoder 13
A to 13N are arranged in correspondence with each other, and each receives a program transmitted from the first chain 44A and outputs video data.

In contrast, the broadcast waves supplied to the antenna 21 are distributed and supplied to the IRDs 84A to 84N,
As in the case of the IRDs 83A to 83N, regardless of the presence or absence of the scrambling process, each receives a program transmitted from the first chain 44A and outputs video data.

The selection circuit 85 operates the first chain 44A by the operation of the operator operating this monitor system.
And video data output from the IRDs 84A to 84N, and
Output to

As shown in FIG. 5, the monitor 86 displays an image based on the video data input from the selection circuit 85 and an IR signal.
This is a monitor device that displays video based on video data input from D83A to 83N on a multi-screen. As a result, the monitor 86 simultaneously displays the video based on the video data on the input side of the multiplexing device 16 and the video based on the corresponding video data on the receiving side for a plurality of video data constituting the multiplexed data.

Here, the monitor 86 divides the display screen into upper and lower parts, and displays an image based on the video data input from the selection circuit 85 as a transmission image in the upper half of the display screen. Also, the video based on the video data output from the IRDs 83A to 83N is displayed on the lower half of the display screen as a received video. As a result, the monitor 86 displays the video based on the video data on the input side of the multiplexing device 16 and the video based on the corresponding video data on the receiving side in a vertically separated manner.

Further, the monitor 86 displays the correspondence between the sending side and the receiving side so as to indicate the correspondence by the number indicating the channel.
The display screen is formed such that the corresponding images are vertically arranged with one image interposed therebetween. As a result, the monitor 86 displays the video based on the video data on the input side of the multiplexer 16 and the video based on the corresponding video data on the receiving side in association with each other.

(2) Operation of the Embodiment In the above configuration, in the digital satellite broadcasting system 1 (FIG. 2), the customer viewing permission system 23 according to the contract such as which pay program the viewer views. , The raw data necessary for receiving the reception contract information EMM is IC
It is provided to the viewer by the card 24.

In the program providing company 2, paid programs, free programs, and the like are created, and the materials of these programs are supplied to the baseband system 5. Also, the schedule is notified to the scheduler 12, and a schedule for controlling the operations of the baseband system 5 and the uplink system 11 is set according to the schedule.

That is, in the baseband system 5, video data, audio data, etc. temporarily stored in the cart 6 are transmitted to the uplink system 11 via the server 8 and the router 9 according to the broadcast schedule. In the uplink system 11, video data, audio data D1, etc. (FIG. 3) are encoded by the encoders 13A to 13N, respectively, and then time-division multiplexed by the multiplexer 16. After being modulated by the succeeding modulation circuit 20, it is frequency-multiplexed and uplinked, and is broadcast from the satellite 22 to the ground.

On the other hand, on the receiving side (FIG. 4),
After the broadcast wave received via the antenna 28 is frequency-converted by the frequency converter 61, the front-end unit 62
, A desired modulated signal is selected from the frequency-multiplexed broadcast wave, and the original multiplexed data is demodulated. Further, in the transport unit 67, the video data and audio data time-division multiplexed from the demodulated multiplexed data are converted into the original data sequence, and the MPEG decoder 7
0, the video signal SV and the audio signal SA are demodulated.

The video data transmitted in this manner,
At the time of multiplexing, the audio data is assigned a packet ID, and program specification information PSI indicating the correspondence between the packet ID and the channel is inserted at a predetermined cycle as program selection reference data, and multiplexed data D3 Is generated.

Correspondingly, on the receiving side, the frequency of the transponder to which the desired program is assigned based on the program specification information PSI, the packet I of this program,
D is detected, and from these detection results, the frequency of the modulation signal selected by the front end unit 62 is switched, and the packet separated by the transport unit 67 is switched. This makes it possible to easily select a desired program from a plurality of programs multiplexed and transmitted based on the program selection reference data.

In the transport stream packet transmitted in this manner, for a pay program or the like (FIG. 5), one of the two types of key data generated by the ECM encryption circuit 81 is used. After scramble processing, identification data indicating the scramble processing and a key data descriptor indicating the scrambled key data are allocated to the header portion and transmitted.

The decryption information ECM of the program itself is generated from the two sets of key data, and the decryption information ECM of the program itself is scrambled in accordance with the reception contract information EMM, and together with the reception contract information EMM similarly scrambled. Multiplexed with the transport stream packet and transmitted.

On the receiving side, when the scrambling process is detected from the header of the transport stream packet, the descrambling process of the receiving contract information EMM is canceled by using the raw data recorded on the IC card 24, and the receiving contract The decryption information ECM of the program itself is descrambled by the descrambling process based on the information EMM. Further, key data is obtained from the decoding information ECM of the program itself, and the scramble of the transport stream packet is released. As a result, when reception is possible by the reception contract information EMM, that is, in a contract program, a program based on the transport stream packet can be viewed.

On the other hand, in a non-contracted program, it is difficult to obtain key data from the decoding information ECM of the program itself, which makes it difficult to view the program.

When a program is provided by the program providing company 2 in this manner, the digital satellite broadcasting system 1
In this case, the user is provided with a program based on the number of services multiplexed in each of the chains 44A to 44N × the number of chains. These programs are monitored by the monitor system 80 (FIG. 1), and when an abnormality occurs, the location of the abnormality is quickly identified.

That is, in the monitor system 80, the program transmitted from each of the chains 44A to 44N has video data branched from the input side of each of the chains 44A to 44N, and the video data is transmitted to the corresponding monitor section 81A to 81N.
N. These video data are stored in each monitor 8
1A to 81N, the monitor 8 via the selection circuit 85
6. Thereby, each chain 44A-44N
The transmitted programs are monitored by monitor units 81A to 81N corresponding to the chains 44A to 44N, respectively, on the input side of the multiplexing device 16 for monitoring.

The broadcast waves supplied to the antenna 21 are distributed and input to the monitor units 81A to 81N, and the IRDs 84A to 84N of the monitor units 81A to 81N receive the programs transmitted from the chains 44A to 44N, respectively. You. Further, video data output from the IRDs 84A to 84N is supplied to a monitor 86 via a selection circuit 85. As a result, for the programs transmitted from the chains 44A to 44N, the transmission images at the time of uplink are respectively monitored by the monitor units 81A to 81N corresponding to the chains 44A to 44N.

On the other hand, the broadcast wave downlinked via the antenna 82 is input to the monitor units 81A to 81N, and the IRDs 83A to 83N of the monitor units 81A to 81N.
, Programs transmitted from the respective chains 44A to 44N are received. Further, video data output from the IRDs 83A to 83N is supplied to the monitor 86.
Thus, the program transmitted from each of the chains 44A to 44N is transmitted to the monitor unit 8 corresponding to each of the chains 44A to 44N.
In each of 1A to 81N, the received video downlinked is monitored.

Thus, each monitor 86 of the monitor sections 81A to 81N is monitored, and if an abnormality is detected in any one of the monitors 86, the corresponding chains 44A to 44N themselves or the chains 44A to 44N are controlled. It is possible to determine that an abnormality has occurred in the control system.

Further, the video data supplied to the monitor 86 in this way is simultaneously displayed by the multi-screen display of the monitor 86 (FIG. 5). This reduces the burden of monitoring a plurality of channels.

Further, on the monitor 86, the display screen is divided into upper and lower parts, and the transmission image and the reception image are displayed separately. Also, the corresponding video is displayed vertically on the sending side and the receiving side with one video interposed therebetween. As a result, it is possible to quickly identify an abnormal location in each of the chains 44A to 44N.

In other words, when the input side of the encoders 13A to 13N is selected as the transmission image by the selection circuit 85 and the lower half image is cut off at one monitor 86 at a time, the IRD is transmitted from the encoders 13A to 13N.
It can be determined that an abnormality has occurred in the routes from 83A to 83N, and moreover, in the routes common to the programs. In this case, if the contact of the selection circuit 85 is switched to the IRDs 84A to 84N and the image is displayed on the monitor 86 and the image is displayed correctly, it can be determined that an abnormality has occurred in the satellite 22.

On the other hand, the contact of the selection circuit 85
When an abnormality is detected via the monitor 86 by switching to 84A to 84N, the multiplexing device 16 sends the signal to the amplifier circuits 54A to 54N.
It can be determined that an abnormality has occurred in the route leading to 54N. In this case, the chain in which the abnormality has occurred can be switched to the spare chain 51A or 51B, and the abnormality can be immediately eliminated.

If an abnormality occurs between the video on the transmitting side and the video on the receiving side in one program, it can be determined that the abnormality has occurred before the corresponding encoders 13A to 13N.

If an abnormality occurs in only one received image, the encoders 13A to 13N send the signals to the IRDs 83A to 8N.
In the path leading to 3N, it can be determined that an abnormality has occurred in the path of only this one program, and it can be determined that the encoder corresponding to this program is abnormal.

(3) Effects of the Embodiment According to the above configuration, the video to be transmitted on the input side of the encoders 13A to 13N on the input side of the multiplexer 16 is
Correlation between the corresponding received video on the receiving side received by the IRDs 83A to 83N, and division of the transmitted video and the received video, and simultaneous display of video data of a plurality of systems enables abnormal locations in multi-channel broadcasting. Can be quickly identified.

(4) Other Embodiments In the above-described embodiment, the switching of the selection circuit 85 causes not only the video output from the input side of the encoders 13A to 13N on the input side of the multiplexing device 16 but also the video output from the input side. Although the case has been described in which the transmission image directly below the antenna 21 can be monitored, the present invention is not limited to this, and the monitoring of the transmission image immediately below the antenna 21 may be omitted as necessary. Conversely, the output video may be monitored at the output terminal of the IFSW 52, the output terminal of the modulator 20, the output terminal of the multiplexer 16, and the like.

Further, in the above-described embodiment, the case has been described where all the transmission video and the reception video constituting one transponder are displayed by the multi-screen display of one monitor, but the present invention is not limited to this. A plurality of transmission images and a plurality of reception images constituting a plurality of transponders may be displayed together by one multi-screen display. Conversely, the multi-screen display of a plurality of monitors allows one
May display a part of a plurality of transmission video and reception video constituting the transponder of the present invention.
A plurality of transmission videos and reception videos constituting one transponder may be displayed.

Further, in the above-described embodiment, a case has been described where the present invention is applied to a digital satellite broadcasting system. However, the present invention is not limited to this, and can be widely applied to various digital broadcasting systems such as a cable television. Can be.

[0083]

As described above, according to the present invention, the outgoing image on the input side of the multiplexing means and the corresponding received image on the receiving side are made correspondent, and the outgoing image and the received image are separated. By displaying a plurality of streams of video data at the same time, it is possible to quickly identify an abnormal portion even in a multi-channel broadcast.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a monitor system of a digital satellite broadcasting system according to an embodiment of the present invention.

FIG. 2 is a block diagram illustrating an overall configuration of a digital satellite broadcasting system.

FIG. 3 is a block diagram illustrating the uplink system of FIG. 2;

FIG. 4 is a block diagram illustrating the IRD of FIG. 2;

FIG. 5 is a schematic diagram illustrating a display screen of the monitor of FIG. 1;

FIG. 6 is a characteristic curve diagram for describing a digital satellite broadcasting system.

[Explanation of symbols]

1 ... Digital satellite broadcasting system, 2 ... Program provider, 5 ... Baseband system, 11 ... Uplink system, 12 ... Scheduler, 13 ... Encoder, 16 ... Multiplexer, 17 ... Scran Blur, 2
0: modulation circuit, 22: satellite, 23: customer viewing permission system, 27, 83A to 83N, 84A to 84N ...
IRD, 29: customer management system, 80: monitor system, 81A to 81N: monitor unit, 85: selection circuit, 86: monitor

Claims (6)

[Claims] 1. A multiplexing means for multiplexing and transmitting multi-channel video data, a transmitting picture based on the video data on an input side of the multiplexing means, and a receiving picture based on the corresponding video data on a receiving side. Corresponding, and said transmission video,
A multi-channel broadcasting apparatus, comprising: a monitor for dividing the received video and displaying at least a plurality of systems of video data of the multi-channel video data at the same time. 2. The multi-channel broadcasting device according to claim 1, wherein the monitor displays the transmission image and the reception image based on the plurality of streams of video data on a multi-screen. 3. The multiplexing unit frequency-multiplexes a plurality of multiplexed data obtained by time-division multiplexing of video data and transmits the multiplexed data, and the monitor unit uses the video data constituting the multiplexed data. The multi-channel broadcasting device according to claim 1, wherein the transmission video and the reception video are displayed on a multi-screen. 4. A multi-channel broadcasting method for multiplexing and transmitting multi-channel video data by a multiplexing means, wherein a transmission image based on the video data on an input side of the multiplexing means and a corresponding video data on a receiving side. And the transmitted video, and
A multi-channel broadcasting method, wherein the received video is divided and at least a plurality of systems of video data of the multi-channel video data are simultaneously displayed. 5. The multi-channel broadcasting method according to claim 4, wherein the transmission video and the reception video based on the plurality of systems of video data are displayed on a multi-screen. 6. A multiplexed data is generated by time-division multiplexing a predetermined number of video data, and the multiplexed data is frequency-multiplexed and transmitted, thereby multiplexing and transmitting the multi-channel video data. The method according to claim 4, wherein the transmission image and the reception image based on the video data constituting the multiplexed data are displayed on a multi-screen.