JP2002246995A - Transmission device and method therefor, receiving device and method therefor, recording medium, and program thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable to readily generation of transport stream for redistribution. SOLUTION: Original transport packets stored with PSIs or SIs are stored, as shown in Figure 17 (A), are replicated and the replicated transport packets are stored in a buffer A (not shown) and a buffer B (not shown). NITs, described in the transport packets stored in the buffer A and the buffer B, are rewritten. As shown in Figure 17 (A), the transport packets where data A is stored are stored in the buffer A, while the transport packets where data B is stored are stored in the buffer B. As shown in Figures (B) and (C), this generates transport streams for redistribution where the transport stream shown in the Figure 17 (A) is divided by a program A and a program B.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmitting apparatus and method, a receiving apparatus and method, a recording medium, and a program, and more particularly, to a transmitting apparatus and method capable of easily redistributing a digital broadcast signal. , A receiving device and a method, a recording medium, and a program.

[0002]

2. Description of the Related Art A CS (Communication Sat) is placed in the same orbit at 110 degrees east longitude as the BS (Broadcast Satellite) satellite.
ellite) It is planned to launch a satellite.

In digital CS satellite broadcasting using CS satellites (hereinafter abbreviated as CS broadcasting), one broadcasting company manages one repeater, and a plurality of broadcasting companies It operates CS broadcasting by receiving a program from a program provider. That is, unlike the case of BS broadcasting, broadcasting is performed by a single transport stream incorporating a plurality of programs.

[0004]

The maximum transmission capacity of a digital broadcast signal (transport stream) transmitted by one repeater is about 52 Mbps.
This greatly exceeds the transmission capacity of one channel of ATV, which is about 29 Mbps. That is, when a digital broadcast signal is received and redistributed to each CATV broadcast viewer's home,
From the received digital broadcast signal, it is necessary to reconstruct a signal for redistribution having a transmission capacity of about 29 Mbps or less as a CATV broadcast signal. In other words, there is a problem that equipment for reconstructing the broadcast signal is expensive, and the operation of the CS broadcast becomes expensive.

[0005] In the BS broadcast, one repeater is shared by a plurality of independent broadcasters, so each broadcaster sharing one repeater has its own unique broadcaster. A transport stream has been assigned. That is, since the maximum transmission capacity of a broadcast signal assigned to one broadcaster is usually about 29 Mbps or less, a signal from a repeater is simply separated for each broadcaster's assignment. , CATV for one channel. Therefore, there is no need to reconstruct a broadcast signal for redistribution as in the case of CS broadcasting.

[0006] The present invention has been made in view of such a situation, and is intended to facilitate redistribution of a digital broadcast signal.

[0007]

A transmitting apparatus according to the present invention receives a first digital multi-channel broadcast signal corresponding to a plurality of services distributed via a first transmission path from a predetermined distribution source. Receiving means, and dividing the first digital multi-channel broadcast signal in accordance with a predetermined service of the plurality of services, thereby obtaining a second digital signal having a transmission capacity transmittable in a second transmission path. It is characterized by comprising generating means for generating a multi-channel broadcast signal, and transmitting means for transmitting a second digital multi-channel broadcast signal to a receiving device via a second transmission path.

[0008] The first digital multi-channel broadcast signal specifies data provided as a plurality of services and information on the use of the plurality of services, as well as information on a first transmission path and a plurality of services associated with each other. The information is stored, and the generation unit is configured to generate, with respect to the second transmission path associated with each other, the data provided as the predetermined service out of the data provided as the plurality of services and the information on the use of the plurality of services. The second digital multi-channel broadcast signal can be generated by storing the information and the information specifying the predetermined service.

[0009] The transmission method according to the present invention comprises the steps of:
A receiving step of receiving a first digital multi-channel broadcast signal corresponding to a plurality of services, which is distributed via a first transmission path; and transmitting the first digital multi-channel broadcast signal to a predetermined one of the plurality of services. Generating a second digital multi-channel broadcast signal having a transmission capacity transmittable on the second transmission path by dividing the second digital multi-channel broadcast signal in accordance with the second digital multi-channel broadcast signal. And transmitting to the receiving device via the transmission path.

[0010] The program of the first recording medium of the present invention comprises:
Delivered from a predetermined delivery source via the first transmission path,
A receiving step of receiving a first digital multi-channel broadcast signal corresponding to a plurality of services; and dividing the first digital multi-channel broadcast signal in correspondence with a predetermined service of the plurality of services, Generating a second digital multi-channel broadcast signal having a transmission capacity that can be transmitted on the second transmission path, and transmitting the second digital multi-channel broadcast signal to the receiving device via the second transmission path. And a transmitting step.

A first program according to the present invention includes a receiving step of receiving a first digital multi-channel broadcast signal corresponding to a plurality of services, which is distributed from a predetermined distribution source via a first transmission path. By dividing the first digital multi-channel broadcast signal in accordance with a predetermined service among a plurality of services, a second digital multi-channel broadcast signal having a transmission capacity transmittable in a second transmission path is obtained. A computer is configured to execute a process including a generating step of generating and a transmitting step of transmitting a second digital multi-channel broadcast signal to a receiving device via a second transmission path.

[0012] In the transmission apparatus and method of the present invention, the program of the first recording medium, and the first program, the first program is distributed via a first transmission path from a predetermined distribution source. Receiving a first digital multi-channel broadcast signal corresponding to a plurality of services and dividing the first digital multi-channel broadcast signal in accordance with a predetermined service of the plurality of services,
, A second digital multi-channel broadcast signal having a transmission capacity that can be transmitted on the transmission path is generated, and the second digital multi-channel broadcast signal is transmitted to the receiving device via the second transmission path.

[0013] The receiving apparatus of the present invention comprises:
Transmitted via the transmission path, together with information on the use of a plurality of services including data provided as the predetermined service and information on the use of the predetermined service, information on the first transmission path associated with each other, and Receiving means for receiving a digital multi-channel broadcast signal storing information for specifying a predetermined service; and information for specifying the specified service when the information for specifying the specified service is included in the information for specifying the predetermined service. Processing means for processing data provided as a designated service based on information relating to the use of the service.

[0014] The receiving method of the present invention comprises the steps of:
Transmitted via the transmission path, together with information on the use of a plurality of services including data provided as the predetermined service and information on the use of the predetermined service, information on the first transmission path associated with each other, and A receiving step of receiving a digital multi-channel broadcast signal storing information for specifying the predetermined service; and when the information for specifying the specified service is included in the information for specifying the predetermined service, the specified service. And a processing step of processing data provided as the designated service based on the information on the use of the service.

[0015] The program of the second recording medium of the present invention comprises:
Transmitted from the transmitting device via the first transmission path,
A digital storage device that stores data provided as a predetermined service and information on the use of a plurality of services including information on the use of the predetermined service, information on a first transmission path associated with each other, and information for specifying the predetermined service. The receiving step of receiving the multi-channel broadcast signal and the information for specifying the designated service include:
And a processing step of processing data provided as the specified service based on the information on the use of the specified service when the information is included in the information specifying the predetermined service.

A second program according to the present invention comprises a plurality of services including data provided as a predetermined service and information on use of the predetermined service transmitted from the transmitting apparatus via the first transmission path. Receiving a digital multi-channel broadcast signal storing information relating to the first transmission path and information identifying a predetermined service, together with information relating to the use of A process for processing data provided as the specified service based on information on the use of the specified service when the information is included in the information for specifying the predetermined service. It is characterized by.

In the receiving apparatus and method of the present invention, the program of the second recording medium, and the second program are provided as a predetermined service transmitted from the transmitting apparatus via the first transmission path. Data associated with the use of the plurality of services including the data related to the use of the predetermined service and information on the use of the predetermined service.
When a digital multi-channel broadcast signal storing information related to a transmission path and information for specifying a predetermined service is received and the information for specifying the specified service is included in the information for specifying the predetermined service, The data provided as the designated service is processed based on the information on the use of the designated service.

[0018]

FIG. 1 shows an example of the configuration of a digital satellite broadcast redistribution system to which the present invention is applied.

The center station 1 managed by the satellite broadcaster is:
MP supplied from multiple program suppliers (not shown)
A program material compressed according to the standards of EG (Moving Picture Coding Experts Group) 2 is scrambled, and the scrambled program material is sent to an electronic program guide (EPG (Electronic Progra
m Guide)) and service information such as viewer management information to generate a transport stream (single transport stream). The center station 1 transmits the generated transport stream as a digital broadcast signal to the CS satellite 2 via the antenna 1A.

The center station 1 also issues an IC card 12 for storing descrambling information for descrambling the transport stream.

The center station 1 further communicates with the CATV station 3 and the receiving system 5 via the telephone line 6. For example, the center station 1 calculates a viewing fee based on the viewing information notified from the receiving system 5 and supplies the viewing fee to the CATV station 3.

The CS satellite 2 has the same east longitude 110 as the BS satellite.
It is a geostationary satellite in degree orbit, and its transmission band per repeater is up to 52.17 Mbps.

CATV station 3 managed by a CATV operator
Receives the digital broadcast signal (single transport stream) transmitted from the center station 1 via the CS satellite 2 and the antenna 3A, and separates the received single transport stream for each program. I do.

For example, as shown in FIG. 2A, when the transport stream from the center station 1 forms two programs A and B, the CATV station 3 converts the transport stream into As shown in FIG. 2 (B), the program A and the program B are separated into two transport streams constituting each.

The CATV station 3 converts the new transport stream (transport stream for redistribution) obtained by the separation into a CATV broadcast signal via the cable television network 4 as a CATV broadcast signal. 5
Send to

That is, in the present invention, the CATV station 3 simply separates the transport stream transmitted from the center station 1 for each program, and
A CATV broadcast signal (transport stream for redistribution) having a transmission capacity of one channel or less is generated.

The receiving system 5 comprises a receiver 11, an IC card 12, and a television receiver 13.
For example, it is provided at the viewer's house.

The receiver 11 selects a broadcast signal of a channel specified by the user from a CATV broadcast signal (transport stream for redistribution) supplied via the cable television network 4, and also selects an IC card. 12
Is decoded based on the information for conditional access stored in the television receiver, and the resulting video signal and audio signal are supplied to the television receiver 13 for output.

FIG. 3 shows an example of the configuration of the center station 1.

PMS (Program Management System) / B
DPS (Broadcast Data Processing System) 21
In addition to registering and managing a program scheduling table of program materials and the like handled by the program supplier, the program scheduling table and program specification information (PSI (Program Specific Informatio
n)) and the like are supplied to a broadcast network management database (NMD) 22.

The NMD 22 selects an SMS (Subscriber Management System) from information from the PMS / BDPS 21.
m) The information corresponding to 24 is extracted and SAS (Subscriber A
uthorization System)) 23, related information transmitting device 27,
The encoder supplies a baseband signal (video signal or audio signal) of the program material, which is supplied from a baseband system (not shown) and corresponds to the extracted information, to the encoder.

The SAS 23 is a key individual information (EMM (Entitlement Management Message)) sent from the SMS 24.
And encrypts and packetizes the EMM and supplies it to the multiplexer 29.

The SMS 24 generates an EMM based on customer registration information and fee collection information stored in the database 25 and information such as a view log from the view log collection system 26 and supplies the EMM to the SAS 23.

The related information transmitting device 27 transmits the key common information (E
A CM (Entitlement Control Message) is generated and supplied to the multiplexer 29 and the scrambler 30.

The encoder 28 encodes the baseband signal, PSI, and the like from the NMD 22 in accordance with the MPEG2 standard, and sends it to the multiplexer 29.

The multiplexer 29 incorporates the data supplied from the encoder 28, the EMM from the SAS 23, or the ECM from the related information transmitting device 27 into a 188-byte fixed-length transport packet, and transmits the transport packet to the scrambler 30. . Note that the EMM and the ECM are incorporated in a transport packet as service information (SI (Service Information)).

The multiplexer 29 also has a time stamp (system time reference value (PCR (Program Clock R
eference))) is set (struck) in a predetermined transport packet.

FIG. 4 shows the structure of a transport packet.

The first 4 bytes of the transport packet are a packet header.

The packet header PID (Packet Identifi
cation) is 13-bit data for identifying the attribute of the individual stream (data string) of the packet.

Each of the transport scramble control and the adaptation field control is 2-bit data.

The cyclic counter is 4-bit data that is incremented by 1 every frame.

The bytes other than the packet header are the data part, in which the payload or the adaptation field is stored. PES (Packetized) that constitutes video data and audio data as a payload
Elementary Stream) is subdivided and stored, or P
SI or SI is stored.

The PSI contains a program association table (PAT (Program Association Tabl).
e)), program map table (PMT (Program
Map Table) or Network Information Table (NIT)
Tables such as e)) are arranged in section format.

FIG. 5 shows the data structure of the PAT. The table ID (8 bits) indicates a PAT, for example, “0x0000” (“0x” indicates hexadecimal notation).

The section sync indicator (1 bit) indicates whether the section header has a long form or a short form. Reserve (2 bits) is a flag that is given meaning in the future.

The section length (12 bits) is from immediately after this to the end of the section (CRC (Cyclic Redundancy).
code), including the code, if any). The TSID (16 bits) identifies a transport stream, and in the case of a satellite, identifies the transponder.

The version number (5 bits) indicates the version of the PAT, and is incremented each time the contents of the PAT are updated. The current next indicator (1 bit) indicates which version of the PAT is used when transmitting new and old versions of the PAT simultaneously.

The section number (8 bits) indicates the section number. The section number of the first section is “0x00”, and the section numbers of the subsequent sections are incremented by one. The last section number (8 bits) indicates the section number of the last section of the same subtable.

The program number (16 bits) indicates the channel, and the network PID (13 bits) indicates the NIT PI when the program number is "0x0000".
D is shown. Program map PID (13 bits)
Indicates a PID corresponding to the PMT.

In FIG. 5, the program number, reserve, network PID, and program map PID, which are surrounded by double lines, are repeatedly described.

CRC (32 bits) is an error detection code for the entire section.

FIG. 6 shows the data structure of the PMT. The description of the same parts as in the PAT is omitted.

The table ID (8 bits) indicates PMT, and is set to “0x02”, for example.

The program number (16 bits) indicates a channel. PCRPID is PCR (Program Clock R
eference) of the packet. The program information length (12 bits) is information that is common to this service in the immediately following loop.

The descriptor is a descriptor in which information complementing the contents of the section is described.

The stream type (8 bits) indicates the type of signal transmitted by the stream, such as video, audio, or data. Elementary PID (13 bits)
Indicates the PID of the elementary stream.

The ES information length (12 bits) is a loop immediately after, and is information on the elementary stream.

In FIG. 6, the descriptor, stream type, reserve, and elementary P enclosed by a double line are shown.
The ID and the ES information length are repeatedly described.

FIG. 7 shows a data structure of the NIT in which information on the physical characteristics of the transmission path is described. For example, the table ID (table_id) is data for classifying the table. Network ID (network_id)
Is data for identifying a network, and when transmitted via a satellite, the ID of the satellite is described as a network ID.

The version number (version_number)
Is data that is incremented by one each time the table contents are updated, and the current next indicator (current_next_indicator) is data for identifying the new and old versions when transmitting the new and old versions simultaneously. .

[0062] The NIT is further provided with a transport stream descriptor for the transport stream.

FIG. 8 shows a satellite delivery system descriptor described as a transport stream descriptor.
escriptor). This descriptor is the first one used in the transport stream descriptor.

The description tag (descriptor_tag) is 8-bit data for identifying a satellite delivery system descriptor. For example, in this example, “0x43” is described as a description tag. Is done. The frequency indicates the transmission frequency of the transponder of the satellite (for example, the CS satellite 2). Orbit (orbit
al _position), West / East flag (west_east_fla)
g), and polarization are determined by satellite (eg, CS
The orbit and the polarization of the satellite 2) are shown. Modulation,
The symbol rate (symbol_rate) and the inner error correction coding rate (FEC_inner) indicate specifications regarding a transmission scheme via a satellite (for example, the CS satellite 2).

FIG. 9 shows the structure of a service list descriptor (service_list_descriptor) described as a transport stream descriptor. This descriptor is used as the second and subsequent transport stream descriptors.

The service ID (service_id) is data for identifying a service. Usually, service ID
Corresponds to the channel selected by the viewer.

The service type (service_type) is shown in FIG.
0 indicates the contents of the service type. For example,
“0X01” indicates a digital TV service.

As described above, the NIT describes information on the physical characteristics of the transmission path.

Returning to FIG. 4, the data portion of the transport packet also includes an adaptation field
The PCR is stored.

Returning to FIG. 3, the scrambler 30 scrambles the transport packet from the multiplexer 29 based on the ECM from the related information transmitting device 27 and outputs the scrambled data to the transmission line coding device 31.

The transmission line encoding device 31 includes a scrambler 3
The data from 0 is modulated, for example, by 8PSK, and the antenna 1
A is transmitted to the CS satellite 2 via A.

FIG. 11 shows a configuration example of the transmission line coding device 31 of the center station 1.

The TS synchronization circuit 41 establishes synchronization by using the synchronization signal of the transport packet supplied from the scrambler 30, and supplies the synchronization to the transmission line multiplexing circuit 42. The TS synchronization circuit 41 also converts a signal corresponding to the transport packet synchronization into a TMCC formation / control circuit 46.
To supply.

The transmission line multiplexing circuit 42
1 is transmitted as shown in FIG.
The data is multiplexed as shown in FIG.

The error correction encoding circuit 43 has the configuration shown in FIG.
As shown in (B), a Reed-Solomon code (204, 1) is assigned to each of the multiplexed transport packets.
An error correction code (outer code) according to (88) is added, and the result is transmitted to the frame configuration circuit 44.

The TMCC generation circuit 45 generates TMCC indicating the type of modulation scheme, coding rate, slot allocation information, transmission speed, and the like, and supplies the TMCC to the TMCC organization / control circuit 46.

The TMCC compiling / control circuit 46 controls the TMC at the timing when the signal is supplied from the TS synchronization circuit 41.
The TMCC supplied from the C generation circuit 45 is supplied to an error correction encoding circuit 47.

The error correction coding circuit 47 adds an error correction code based on the Reed-Solomon code (64, 48) to the TMCC from the TMCC formation / control circuit 46,
It is sent to the unique word generation circuit 48.

The unique word generation circuit 48 generates a unique pattern as a frame synchronization signal and a post-synchronization signal of the transport stream, and sends it to the energy spreading circuit 49 together with the TMCC.

The energy diffusion circuit 49 divides the frequency spectrum of the signal from the unique word generation circuit 48 and supplies it to the frame construction circuit 44.

The frame configuration circuit 44 configures a transmission frame as shown in FIG. That is, the frame configuration circuit 44 configures a frame composed of 48 slots (transport packets to which an error correction code based on the Reed-Solomon code (204, 188) is added), as shown in FIG. The first bytes of the first two slots of one frame are replaced with unique words as a frame synchronization signal from the energy spreading circuit 49, and the first bytes of the third to tenth eight slots are Replaced by TMCC, and the first
The first byte of the first to forty-eighth slots is replaced with a post-synchronization signal.

For example, the synchronization signal (sync_byte) is shown in FIG.
As shown in the first byte.

Referring back to FIG. 11, the frame configuration circuit 44
As shown in FIG. 12D, eight frames each having the above-described configuration are collected, and a superframe is further configured and supplied to the energy diffusion circuit 50.

The energy diffusion circuit 50 applies the data (frame) supplied from the frame configuration circuit 44 to the
An energy diffusion process is performed, and the resulting data is supplied to a block interleave circuit 51.

The block interleaving circuit 51 performs a block interleaving process on the data supplied from the energy spreading circuit 50 and supplies the resulting data to the convolutional coding circuit 52. The convolutional coding circuit 52 adds a convolutional code (inner code) to the data from the block interleave circuit 51 and supplies the data to the modulator 53.

The modulator 53 performs, for example, 8PSK modulation on the data supplied from the convolutional encoding circuit 52, and transmits the data to the antenna 1A.

FIG. 13 shows a configuration example of the CATV station 3. The transmitting device 61 demodulates the digital broadcast signal (single transport stream) from the CS satellite 2 received via the antenna 3A, divides the resulting transport stream for each program, Generate a transport stream for redistribution. The transmission device 61 transmits the generated transport stream for redistribution to the reception system 5 via the cable television network 4 as a CATV broadcast signal.

For example, the customer database management unit 62
It manages information about the viewers of the CS broadcast, and performs processing for charging the viewers for the viewing fee based on the viewing fee information from the center station 1.

FIG. 14 shows a configuration example of the transmitting device 61 of the CATV station 3.

The front end (F / E) 71 has a PID
Under the control of the extraction control circuit 72, a broadcast signal of a predetermined program is selected from the digital broadcast signal received by the antenna 3A, and 8PSK demodulation is performed on the broadcast signal to perform error correction. The front end 71 supplies the resulting transport stream to the PID extraction control circuit 72 and the packet filter 73.

The PID extraction control circuit 72 controls the packet filter 73 so that only the transport packets having a predetermined PID among the transport packets supplied to the packet filter 73 are stored in the buffer memory 74.
To be supplied.

The PID extraction control circuit 72 controls the buffer memory 74 to appropriately copy or store the transport packet supplied from the bucket filter 73.

The PID extraction control circuit 72 detects a transport packet storing a PSI describing NIT from the transport packets supplied from the front end 71, and performs a replacement circuit 77.
Is controlled to rewrite the NIT.

The PID extraction control circuit 72 detects the transport packet storing the PCR from the transport packets supplied from the front end 71, and controls the replacement circuit 77 to control the PCR.
Is replaced.

The PID extraction control circuit 72 also controls a counter 76 and a local clock generation circuit 75.

Although details will be described later, the PID extraction control circuit 7
2 by the control of the front end 71 and the packet filter 73 to the local clock generation circuit 75, a single transport stream as a received digital broadcast signal is divided for each program, and the transport stream for redistribution is divided. Is generated.

Under the control of the PID extraction control circuit 72, the packet filter 73 converts a transport packet input from the front end 71 from a transport packet describing a PID that matches the PID specified by the PID extraction control circuit 72. A packet is selected and supplied to the buffer memory 74.

The buffer memory 74 duplicates a predetermined transport packet among the transport packets from the packet filter 73 and stores the transport packet for each program under the control of the PID extraction control circuit 72. The buffer memory 74 also includes the replacement circuit 7.
The stored transport packet is supplied to the replacement circuit 77 in response to the readout from the storage unit 7.

The local clock generation circuit 75 has a PID
A clock is generated according to the control of the extraction control circuit 72,
It is supplied to the counter 76. The counter 76 counts the clock from the local clock generation circuit 75 under the control of the PID extraction control circuit 72, and supplies the count value to the replacement circuit 77.

The replacement circuit 77 includes a PID extraction control circuit 72
Is controlled by the counter value from the counter 76 and P
Replace CR.

Under the control of the PID extraction control circuit 72, the replacement circuit 77 rewrites the NIT of the transport packet read from the buffer memory 74.

For example, if the satellite delivery system descriptor (FIG. 8) is a cable delivery system shown in FIG.
Rewritten as a delivery system descriptor.

The description tag (descriptor_tag) of the cable delivery system descriptor is 8-bit data for identifying the cable delivery system descriptor, for example, “0x4
4 "is described as a description tag. Frequency (frequenc
y) indicates a transmission frequency for each physical channel of the cable television network 4. Modulation, symbol rate (symbo
l _rate), and inner error correction coding rate (FEC_inner)
Indicates a specification regarding a transmission system via the cable television network 4.

The replacement circuit 77 converts the transport stream in which the contents of the PCR and NIT are changed
8 The modulation circuit 78 performs 64-level QAM modulation on the transport stream from the substitution circuit 77, converts the frequency to a predetermined frequency, and transmits the frequency to the reception system 5 via the cable television network 4.

Next, the operation of the PID extraction control circuit 72 of the transmitting device 61 will be described with reference to the flowchart of FIG. Here, a case will be described as an example in which a transport stream forming two programs A and B as shown in FIG. 2A is separated for each of the programs A and B.

In step S1, the PID extraction control circuit 72 extracts a PID from the transport packet from the front end 71. In step S2, the transport packet has a PCR based on the extracted PID (stored). It is determined whether or not the packet is a packet), and if it is determined that the packet has a PCR, the process proceeds to step S3.

In step S3, the PID extraction control circuit 72 controls the buffer memory 74 to duplicate the transport packet (transport packet having PCR) input from the packet filter 73 to the buffer memory 74. , Buffer A and buffer B
Respectively. Note that the buffer memory 74
It is assumed that two buffers A and B are incorporated.

Next, in step S4, the PID extraction control circuit 72 instructs the replacement circuit 77 to replace the PCR. Thereby, the replacement circuit 77 reads the transport packet having the PCR from each of the buffer A and the buffer B of the buffer memory 74 and counts the PCR stored in the packet into the counter 7.
6 is replaced with the count value supplied at a predetermined timing.

Thus, the PCR is rewritten according to the transmission speed from the CATV station 3. That is,
As a result, in the receiving system 5 (receiver 11), the STC (System Time Clo
ck) is reproduced and the transport stream for redistribution is decoded based on the STC, so that appropriate video or audio is reproduced.

If it is determined in step S2 that the packet is not a transport packet having a PCR,
Proceeding to 5, the PID extraction control circuit 72 determines whether PSI or SI is stored in the transport packet having the PID based on the PID extracted in step S1, and determines that the transport packet is stored. If so, the process proceeds to step S6.

In step S 6, the PID extraction control circuit 72 controls the buffer memory 74 to transfer the transport packet (the transport packet storing the PSI or SI) input from the packet filter 73 to the buffer memory 74. The two copies are made and stored in buffer A and buffer B, respectively.

Next, in step S7, the PID extraction control circuit 72 checks in step S5 whether the transport packet (PSI) determined to be the transport packet storing the PSI or SI describes the NIT in the transport packet (PSI). It is determined whether or not it is described, and if it is determined that it is described, the process proceeds to step S8. That is, in this case, the PSI is stored in the transport packet determined to store the PSI or SI in step S5.

In step S8, the PID extraction control circuit 72 instructs the replacement circuit 77 to rewrite the NIT. As a result, the replacement circuit 77 reads the transport packet storing the PSI describing the NIT from each of the buffers A and B of the buffer memory 74 and rewrites the NIT of the PSI stored in those packets.

Specifically, the satellite delivery system descriptor described in the NIT of the transport packet read from the buffer A (FIG. 8)
Is replaced by a cable delivery system descriptor (FIG. 15).

The satellite delivery system descriptor described in the NIT of the transport packet read from the buffer B is replaced with a cable delivery system descriptor.

If it is determined in step S5 that neither PSI nor SI is stored, the process proceeds to step S9, where PI
The D extraction control circuit 72 outputs the PID extracted in step S1.
, It is determined whether or not the data (data A) constituting the program A is stored in the transport packet having the PID. If it is determined that the data is stored, the process proceeds to step S10.

In step S10, the PID extraction control circuit 72 controls the buffer memory 74 to transfer the transport packet (the transport packet storing the data A) input from the packet filter 73 to the buffer memory 74. The data is stored in the buffer A.

On the other hand, if it is determined in step S9 that the data A is not stored, the process proceeds to step S11,
The PID extraction control circuit 72 outputs the PID extracted in step S1.
Based on the ID, it is determined whether or not the data (data B) constituting the program B is stored in the transport packet having the PID. If it is determined that the data is stored, the process proceeds to step S12.

In step S12, the PID extraction control circuit 72 controls the buffer memory 74 to transfer the transport packet (the transport packet storing the data B) input from the packet filter 73 to the buffer memory 74. The data is stored in the buffer B.

When the processing in step S4 is performed, when the determination in step S7 is NO, when the processing in step S8 is performed, when the processing in step S10 is performed, the determination in step S11 is NO. When the processing of step S12 is performed,
The processing returns to 1 and the subsequent processing is executed.

For example, the center station 1 shown in FIG.
The transport stream transmitted from
When the packet has a packet structure as shown in FIG.
The PID extraction control circuit 72 executes the processes in steps S1 to S12 described above, so that the transmitting device 61 has two re-distributions as shown in FIGS. 17B and 17C. A transport stream is generated.

The transport stream shown in FIG. 17B is composed of PSI and NIT in which the satellite delivery system descriptor describes the NIT rewritten in the cable delivery system descriptor.
Is described, PSI, SI, and data A are
Each transport packet is stored. That is, a packet storing information related to program B is separated from the transport stream in FIG.

The transport stream shown in FIG. 17C is composed of PSI and NIT in which the satellite delivery system descriptor describes the NIT rewritten in the cable delivery system descriptor.
Is described, PSI, SI, and data B are
It is composed of transport packets stored respectively. That is, a packet storing information related to the program A is separated from the transport stream in FIG.

As described above, a transport stream for redistribution can be generated only by separating the transport stream from the center station 1 for each program.
Also, the billing process is performed by using the data generated in the center station 1 as it is.
The burden on the V station 3 is further reduced.

FIG. 18 shows a configuration example of the receiver 11 of the receiving system 5.

The CATV broadcast signal (transport stream for redistribution) supplied via the cable television network 4 is input to the tuner 81 of the receiver 11.

The tuner 81 converts a CATV broadcast signal into
The broadcast signal of the designated program is selected, and a digital modulation signal corresponding to the broadcast signal is output to the demodulation circuit 82.

The demodulation circuit 82 demodulates the digitally modulated signal from the tuner 81 to 64-level QAM and outputs the result to the error correction circuit 83.

The error correction circuit 83 executes an error correction process using a Reed-Solomon code on the signal from the demodulation circuit 82, and outputs the resulting error-corrected transport stream to the descrambler 84. I do.

The tuners 81 to the error correction circuit 8
3 constitutes a front end unit 80.

The descrambler 84 includes a controller 98
The descrambler transports the scrambled transport stream from the error correction circuit 83 based on the descrambler information supplied from the.

The demultiplexer 85 is connected to the controller 9
The packet storing the video data or audio data of the program specified by 8 or the additional data is
Separate from the transport stream from descrambler 84.

The demultiplexer 85 stores the data stored in the separated packets in the buffer memory 86, reads out the data as appropriate, and outputs the video data to the video processing circuit 87, the audio data to the audio processing circuit 88, and the additional data. The data is output to the controller 98, respectively.

The video processing circuit 87 expands the video data from the demultiplexer 85 in accordance with, for example, the MPEG2 standard, and converts the resulting signal into a combiner 90.
Output to

The audio processing circuit 88 expands the audio signal from the demultiplexer 85 in accordance with the MPEG2 standard, and outputs the resulting signal to the television receiver 13.

The OSD circuit 89 generates a character display signal for displaying characters on an image and outputs the signal to the synthesizer 90.

The synthesizer 90 synthesizes the video signal from the video processing circuit 87 with the character signal from the OSD circuit 89 and outputs the synthesized signal to the television receiver 13.

The interface (I / F) section 91 performs an interface process between the IC card 12 connected thereto and the controller 98.

The IC card 12 includes a descrambler 84
Stores a key (descrambling information) for descrambling the transport stream.

When the limited access information is supplied from the controller 98 via the interface section 91, the IC card 12 determines whether or not the program can be viewed based on the information. When the IC card 12 determines that the user can view the program, the IC card 12 supplies the stored key to the controller 98 via the interface unit 91.

The modem 92 is connected to the telephone line 6 and communicates with the center station 1 and the CATV station 3.

Various programs executed by the controller 98 are stored in the ROM 93. EEPROM 9
4 stores the acquired NIT and the like as appropriate. RAM
In 95, data necessary for the controller 98 to execute processing is stored as appropriate.

The display section 96 is composed of, for example, a liquid crystal display element for displaying the operation state of the apparatus.
When inputting a predetermined command to the controller 98, the operation unit 97 is appropriately operated by a user (viewer).

The controller 98 controls each section.

Next, the operation of the receiver 11 will be described with reference to the flowchart of FIG.

At step S21, a predetermined channel M (for example,
2 or 17 is designated, and the controller 98 is notified of the designation.
8 controls the demultiplexer 85 to acquire the NIT stored in the transport packet.

The controller 98 appropriately monitors, via the demultiplexer 85, the version number of the NIT described in the PSI stored in the predetermined transport packet, and when the number has been changed, When the NIT is updated, the contents of the NIT are read and stored in the EEPROM 94.

In step S23, the controller 9
8 determines whether there is a service list descriptor in which the service ID corresponding to the channel M is described in the NIT, and when it is determined that such a service list descriptor exists, Proceed to step S24.

At the step S24, the controller 9
8 acquires the cable delivery system descriptor combined before the service list descriptor detected in step S23, recognizes the frequency of the broadcast signal of channel M, and uses it as a reception frequency. Set in the front end unit 80. This allows
A broadcast signal of channel M is received.

Next, in step S25, the controller 98 controls the demultiplexer 85 to
From the obtained PAT, and the P attached to the program A
Get the PID of the MT.

At the step S26, the controller 9
8 controls the demultiplexer 85 to execute step S2
The PMT corresponding to the PID obtained in step 5 is acquired, and the elementary PID corresponding to the program A is recognized from the acquired PMT.

Next, in step S27, the controller 98 controls the demultiplexer 85 to separate a transport packet having a PID that matches the elementary PID. In the case of this example, a packet storing video data and audio data of program A and a packet storing additional data of program A are separated.

The controller 98 extracts the limited reception information from the additional data separated at this time, and supplies it to the IC card 12 via the interface unit 91. IC
As described above, the card 12 determines whether or not the program A is viewable based on the limited reception information. If it is determined that the program A is viewable, the card 12 transmits the descramble information via the interface unit 91. And outputs it to the controller 98. The controller 98 sets the descramble information from the IC card 12 in the descrambler 84.
The descrambler 84 descrambles the scrambled video data or audio data packet using the descramble information.

At step S23, the service list descriptor of the NIT acquired at step S22 is
When it is determined that the service ID corresponding to the channel M is not described, the process proceeds to step S28, and the controller 98 controls the display unit 96 to indicate that the program A is not being broadcast (the broadcast signal of the program A is Is displayed).

When the processing in step S27 or S28 has been performed, the processing ends.

That is, since the receiver 11 selects a program based on the NIT, for example, the front end of the receiver for CS satellite broadcasting is changed to a front end capable of receiving a CATV broadcast signal. By replacing with the unit 80, CS broadcast can be viewed.

The above-described series of processing can be realized by hardware, but can also be realized by software. When a series of processing is realized by software, a program constituting the software is installed in a computer, and the program is executed by the computer.
The transmitting device 61 of the TV station 3 and the receiver 11 of the receiving system 5 are functionally realized.

FIG. 20 is a block diagram showing the configuration of an embodiment of the computer 501 functioning as the transmitting device 61 of the CATV station 3 and the receiver 11 of the receiving system 5 as described above. CPU (Central Processing Unit) 5
11 has an input / output interface 51 via a bus 515.
When a user inputs a command from an input unit 518 including a keyboard, a mouse, and the like via an input / output interface 516, the CPU 511, for example, reads a ROM (Read Only Memory) 512, a hard disk 514, etc. Or a magnetic disk 531, an optical disk 532, and a magneto-optical disk 53 mounted on the drive 520.
3 or a program stored in a recording medium such as a semiconductor memory 534, using a random access memory (RAM).
y) Load to 513 and execute. Thereby, the various processes described above are performed. Further, the CPU 511 outputs the processing result to a display unit 517 such as an LCD (Liquid Crystal Display) via the input / output interface 516 as necessary. The program is stored in the hard disk 514 or the ROM 512 in advance and provided to the user integrally with the computer 501 or provided as package media such as the magnetic disk 531, the optical disk 532, the magneto-optical disk 533, and the semiconductor memory 534. Or can be provided to the hard disk 514 via a communication unit 519 from a satellite, a network, or the like.

In the present specification, the steps of describing a program provided by a recording medium may be performed not only in chronological order but also in chronological order in the order described. This also includes processing executed in parallel or individually.

In this specification, the system is defined as:
It represents the entire device composed of a plurality of devices.

[0161]

According to the transmitting apparatus and the method of the present invention, the program of the first recording medium, and the first program, a plurality of programs distributed from a predetermined distribution source via the first transmission path are provided. The first digital multi-channel broadcast signal corresponding to the service is received and received, and the first digital multi-channel broadcast signal is divided according to a predetermined service of the plurality of services. , A second digital multi-channel broadcast signal having a transmission capacity that can be transmitted on the transmission path can be easily generated.

According to the receiving apparatus and method of the present invention, the program of the first recording medium, and the second program,
Transmitted from the transmitting device via the first transmission path,
A digital storage device that stores data provided as a predetermined service and information on the use of a plurality of services including information on the use of the predetermined service, as well as information on a first transmission path associated with each other and information specifying the predetermined service. When a multi-channel broadcast signal is received and the information specifying the specified service is included in the information specifying the predetermined service, the service is provided as the specified service based on the information on the use of the specified service. Since the data to be processed is processed, the designated service can be easily used.

[Brief description of the drawings]

FIG. 1 is a diagram showing a use example of a CATV station 3 and a receiving system 5 to which the present invention is applied.

FIG. 2 is a diagram illustrating a transport stream for redistribution.

FIG. 3 is a block diagram showing a configuration example of a center station 1 in FIG.

FIG. 4 is a diagram showing a structure of a transport packet.

FIG. 5 is a diagram illustrating a PAT.

FIG. 6 is a diagram illustrating a PMT.

FIG. 7 is a diagram illustrating NIT.

FIG. 8 is a diagram illustrating a satellite delivery system descriptor.

FIG. 9 is a diagram illustrating a service list descriptor.

FIG. 10 is a diagram illustrating a service type.

11 is a block diagram illustrating a configuration example of a transmission line encoding device 31 in FIG. 3;

FIG. 12 is a diagram illustrating the operation of the transmission path encoding device 31.

13 is a block diagram illustrating a configuration example of a CATV station 3 in FIG.

14 is a block diagram illustrating a configuration example of a transmission device 61 in FIG.

FIG. 15 is a diagram illustrating a cable delivery system descriptor.

FIG. 16 is a flowchart illustrating an operation of a PID extraction control circuit 72 of the transmission device 61.

FIG. 17 is a diagram illustrating the operation of the transmission device 61.

18 is a block diagram illustrating a configuration example of a receiver 11 of the reception system 5 in FIG.

FIG. 19 is a flowchart illustrating the operation of the receiver 11.

FIG. 20 is a block diagram illustrating a configuration example of a computer 501.

[Explanation of symbols]

1 center station, 2 CS satellites, 3 CATV station,
4 cable TV network, 5 receiving system, 11
Receiver, 12 IC card, 13 television receiver, 21 PMS / BDPS, 22 NMD,
23 SAS, 24 SMS, 25 database,
26 view log collection system, 27 related information sending device, 28 encoder, 29 multiplexer,
30 scrambler, 31 transmission line coding device,
41 TS synchronization circuit, 42 transmission line multiplexing circuit, 43
Error correction coding circuit, 44 frame configuration circuit,
45 TMCC generation circuit, 46 TMCC organization / control circuit, 47 error correction coding circuit, 48 unique word generation circuit, 49 energy diffusion circuit,
Reference Signs List 50 energy diffusion circuit, 51 block interleave circuit, 52 convolutional coding circuit, 53 modulator, 61 transmitting device, 62 customer database management unit, 71 front end, 72 PID extraction control circuit, 73 packet filter, 74 buffer memory, 75 local Clock generation circuit, 76 counter, 77 replacement circuit, 78 modulation circuit, 80 front end section, 81 tuner, 82 demodulation circuit, 83 error correction circuit, 84 descrambler, 85 demultiplexer, 86 buffer memory, 87 video processing circuit, 88 Audio processing circuit, 89 OSD circuit, 90 synthesizer, 91
Interface section, 92 modem, 93 ROM,
95 RAM, 96 display unit, 97 operation unit,
98 Controller

Claims (9)

[Claims] 1. A receiving means for receiving a first digital multi-channel broadcast signal corresponding to a plurality of services and distributed from a predetermined distribution source via a first transmission path; Generating means for generating a second digital multi-channel broadcast signal having a transmission capacity transmittable on a second transmission path by dividing the channel broadcast signal in accordance with a predetermined service of the plurality of services; Transmitting the second digital multi-channel broadcast signal to the second digital multi-channel broadcast signal;
Transmitting means for transmitting to the receiving device via the transmission path of (1). 2. The first digital multi-channel broadcast signal includes data provided as the plurality of services and information on use of the plurality of services.
Information on the first transmission path and information specifying the plurality of services associated with each other are stored, and the generation unit is provided as a predetermined service of the data provided as the plurality of services. Generating the second digital multi-channel broadcast signal by storing information relating to the second transmission path and information identifying the predetermined service, which are associated with each other, together with data relating to use of the plurality of services and information relating to the use of the plurality of services. The transmitting device according to claim 1, wherein 3. A receiving step of receiving a first digital multi-channel broadcast signal corresponding to a plurality of services, which is distributed via a first transmission path from a predetermined distribution source; Generating a second digital multi-channel broadcast signal having a transmission capacity transmittable on a second transmission path by dividing the channel broadcast signal in accordance with a predetermined service of the plurality of services; Transmitting the second digital multi-channel broadcast signal to the second digital multi-channel broadcast signal;
Transmitting the data to the receiving device via the transmission path. 4. A receiving step of receiving a first digital multi-channel broadcast signal corresponding to a plurality of services distributed from a predetermined distribution source via a first transmission path; Generating a second digital multi-channel broadcast signal having a transmission capacity transmittable on a second transmission path by dividing the channel broadcast signal in accordance with a predetermined service of the plurality of services; Transmitting the second digital multi-channel broadcast signal to the second digital multi-channel broadcast signal;
A transmission step of transmitting to a receiving device via the transmission path of (1), wherein the computer-readable program is recorded. 5. A receiving step of receiving a first digital multi-channel broadcast signal corresponding to a plurality of services distributed from a predetermined distribution source via a first transmission path; Generating a second digital multi-channel broadcast signal having a transmission capacity transmittable on a second transmission path by dividing the channel broadcast signal in accordance with a predetermined service of the plurality of services; Transmitting the second digital multi-channel broadcast signal to the second digital multi-channel broadcast signal;
And a transmission step of transmitting the data to a receiving device via the transmission path. 6. A data transmitted as a predetermined service transmitted from the transmitting apparatus via the first transmission path and information on use of a plurality of services including information on use of the predetermined service, Receiving means for receiving a digital multi-channel broadcast signal storing information relating to the first transmission path and information specifying the predetermined service, which are associated with each other; And a processing unit for processing data provided as the specified service, based on the information on the use of the specified service, when the information is included in the information specifying the specified service. 7. A data transmitted as a predetermined service transmitted from the transmitting device via the first transmission path, and information on use of a plurality of services including information on use of the predetermined service, A receiving step of receiving a digital multi-channel broadcast signal storing information relating to the first transmission path and information identifying the predetermined service, which are associated with each other; And a processing step of processing data provided as the specified service based on the information on the use of the specified service when the information is included in the information specifying the specified service. 8. A data transmitted as a predetermined service transmitted from the transmitting apparatus via the first transmission path and information on the use of a plurality of services including information on the use of the predetermined service, A receiving step of receiving a digital multi-channel broadcast signal storing information relating to the first transmission path and information identifying the predetermined service, which are associated with each other; Processing the data provided as the designated service based on the information on the use of the designated service when the information is included in the information for specifying A recording medium on which a possible program is recorded. 9. A data transmitted as a predetermined service transmitted from the transmitting device via the first transmission path, and information on use of a plurality of services including information on use of the predetermined service, A receiving step of receiving a digital multi-channel broadcast signal storing information relating to the first transmission path and information identifying the predetermined service, which are associated with each other; And a processing step of processing data provided as the specified service, based on the information on the use of the specified service, when the information is included in the information that specifies the specified service. Features program.