JP2001144708A - Transmitter-receiver, receiver, transmission system and transmitting method for digital broadcasting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transmitter-receiver, a receiver, a transmission system and a transmitting method for digital broadcasting which is executable at a low cost by simplifying the processing in a transmitting station in the range where a receiver does not need function addition in the case of retransmitting a program of another network. SOLUTION: On a transmitting side (a), TS multiplexers 103-1 to 103-n performs time division multiplexing of a TS signal including the program of another network outputted from receiving decoders 102-1 to 102-n and a TS signal including NIT information outputted from a program information generator 106. On a receiving side (b), a demodulator 201, a TS separator 202 and an MPEG separator 203 extract the NIT information outputted from the generator 106 under a command of a controlling part 205 and a program is selected on the basis of the NIT information.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital broadcasting transmission system.

[0002]

2. Description of the Related Art Generally, CATV (Cable Television)
Digital broadcasting and BS (Broadcasti
ng Satellite) and digital broadcasting scheduled for terrestrial broadcasting, the MPEG (Moving Picture Experts Groove)
up) Multiplexing scheme is used. MPEG is a standard relating to a technology for compressing expression media such as video and audio. In particular, in an MPEG2 transport stream (hereinafter abbreviated as “TS”), a plurality of programs can be transmitted by one stream. M
PEG2 is based on a packet multiplexing method in which each element signal to be multiplexed is contained in a packet of a fixed length, and the packet is multiplexed in time division with other element signals in units of the packet. A TS that is a multiplex signal includes a plurality of broadcast media,
The element signals of each of the plurality of expression media of each of the plurality of programs can be multiplexed. Therefore, in order to correctly select and reproduce a target program on the receiving side, packets constituting the target program can be extracted from a large number of packets, and identification of video packets, audio packets, etc., and identification of each packet can be performed. It must be possible to identify the playback time. A mechanism for correctly restoring the target program will be described below.

According to the TS standard, a video signal, an audio signal, and the like are transmitted in a 188-byte TS packet format. TS
The packet (TSP) includes a 4-byte header and a 184-byte data field. An identifier (PI) for distinguishing individual TS packets is included in the header.
D: PacketIdentifier). In TS format transmission,
By attaching this PID value so that there is no duplication in the TS, even if a plurality of TSPs are multiplexed and transmitted, the receiving device extracts the desired TSP and reproduces the program (program). It is possible to For example, if you want to transmit one program consisting of a video signal and an audio signal,
If the PID value of the TSP assigned to the video signal and the PID value of the TSP assigned to the audio signal are set to different values, individual signals can be extracted even when multiplexed and transmitted, whereby video and audio are separately reproduced. can do.

[0004] This is also true for a plurality of programs. If PID values to be assigned to individual programs (a plurality of signals constituting a program) are attached so that they do not overlap in a transmission path,
Even if a plurality of programs are multiplexed and transmitted, the P
By extracting a packet having an ID value, it is possible to extract and reproduce only a desired signal (program). Therefore, when a plurality of programs are multiplexed and transmitted, the receiving side cannot reproduce a desired program without knowing the program configuration and the PID value of each signal (TS) constituting the program.

Therefore, in the transmission in the TS format, program specification information (Program Sp
ecific information (abbreviated as “PSI”) is transmitted. More specifically, the PSI contains NIT (Networ) that describes information about a physical network and information about programming.
kTable), PMT (Program MapTabl) that describes the PID of the stream that constitutes each program and the PID of the PCR (program clock reference) of the program.
e) PMT and NI corresponding to each program of the multiplex program
PAT (Program Association Ta) describing the PID of T
ble). On the receiving side, by decoding this PSI data and obtaining the necessary PID value, it becomes possible to select a specific TS and reproduce a desired program.

[0006] Information used for selecting a program represented by PSI / SI information differs depending on each media and each network. Therefore, even if the TS of another medium or the TS of another network is retransmitted as it is, the program cannot be selected normally. Retransmitting a TS of another medium or a TS of another network as it is means retransmitting the PSI / SI information contained in the TS without processing it. In that case, the NIT
This is because the information (for example, frequency information) related to the physical channel included in the data is different, so that tuning or transmission path decoding cannot be performed normally as it is. Therefore, a desired program cannot be normally selected from a plurality of programs.

For this reason, conventionally, a CATV receiving station performing digital retransmission extracts video / audio program element information included in a TS for another medium and extracts the CAT from the extracted program element information.
V program arrangement information (PSI / SI) and CAT
A method has been adopted in which a TS for V is re-edited and transmitted to a transmission path. Such a conventional technique will be described with reference to FIG. FIG. 4A is a block diagram showing a main configuration of a transmitting side (transmitting apparatus) in a conventional digital broadcast transmission method or transmission method. FIG. 4B is a block diagram showing a main configuration of a receiving side (receiving device) in a conventional digital broadcast transmission system or transmission method.

First, the configuration and operation of the transmitting side (transmitting device) will be described. The transmitting side (transmitting device)
1. TS multiplexer 406, modulator 408, and reception decoders 402-1 to 402-n provided for each TS, MPE
G separators 403-1 to 403-n, PID conversion 404-
1 to 404-n, MPEG multiplexers 405-1 to 405-
n, and program information generators 409-1 to 409-n. However, the program information generators 409-1 to 409-
n can be shared.

[0009] A received broadcast wave (for example, a CS broadcast wave) input from a receiving antenna is received by a splitter 401 by a receiving decoder 4.
The signals are distributed or branched by the number of 02-1 to 402-n and sent to the reception decoders 402-1 to 402-n. The reception decoders 402-1 to 402-n extract a signal of a specified (physical) channel from the received broadcast wave and decode the signal into a TS signal. The TS signals decoded by the reception decoders 402-1 to 402-n are MPEG separators 403-1 to 403-.
n, and the MPEG separators 403-1 to 403-n instruct the program information generators 409-1 to 409-n (B1).
Separates the TSP of the program. T of the separated program
The SP is input to PID conversions 404-1 to 404-n, and the PID is converted into program information generators 409-1 to 409.
According to the instruction (B2) of −n, the PID is converted (= rewritten) to the PID for CATV transmission,
405-n.

Also, MPEG separators 403-1 to 403
At -n, PSI information is simultaneously extracted (= separated) from the TS signal. The extracted PSI information is sent to program information generators 409-1 to 409-n (D
1). In the program information generators 409-1 to 409-n, M
It receives the PSI information sent from the PEG separators 403-1 to 403-n, and rewrites (= converts) the PSI information for CATV. TSP and P of PID converted program
The SI information is both MPEG multiplexers 405-1 to 405-n.
(D11), and the MPEG multiplexers 405-1 to 40-40
5-n time-division multiplexing. MPEG multiplexer 405-
The outputs of 1 to 405-n are sent to the TS multiplexer 406,
The signal is time-division multiplexed with another TS by the S multiplexer 406 and sent to the modulator. In the modulator, the input TS signal is subjected to CATV transmission line coding and modulation, and transmitted to the transmission line.

Next, the configuration and operation of the receiving side (receiving device) will be described. The receiving side (receiving device) includes a demodulator 501,
It comprises a TS separator 502, an MPEG separator 503, an MPEG decoder 504 and a control unit 505.

[Selection / Decoding of Viewing Program] On the receiving side (receiving device), the following operation is performed for selecting / decoding the viewing program. The signal sent from the transmission path is
The channel is demodulated (tuned) by the demodulator 501 in accordance with the instruction (C1) of No. 5, and then the transmission path is decoded and sent to the TS separator 502. The TS separator 502 having received the instruction (C2) from the control unit 505 separates the TS including the program to be viewed from the signal decoded by the demodulator 501. MPE
The G separator 503 extracts (separates) the TSP of the program to be viewed from the TS received according to the instruction (C3) of the control unit 505, and sends the TSP to the MPEG decoder 504. M
The PEG decoder 504 decodes the TSP of the received program into a video / audio signal into a baseband signal and sends it to the video display unit. [Acquisition of Information Used for Program Selection] The receiving side (receiving device) performs the following operation to acquire information used for program selection. When selecting a program, the control unit 505 receives the PSI information of the currently received TS from the MPEG separator 503. The control unit 505 refers to the PAT of the PSI information, acquires the program number included in the currently received TS, and determines whether the program to be viewed is
Check whether it is included in. If the program to be viewed is not included in the currently received TS, the control unit 505 acquires the NIT based on the PID specified by the PAT,
Which physical channel and which TS to refer to and watch
Get information about what is included in The control unit 505 instructs the demodulator 501 and the TS separator based on this information (C1,
C2), and select a corresponding TS of a physical channel including a program to be viewed. Further, the control unit 505
It instructs the G separator 503 (C3) to acquire the PAT of the selected TS. The control unit 505 determines the acquired PA
From T, the PID of the PMT having information on the program to be viewed is acquired based on the program number of the program to be viewed. Control unit 505
Instructs the MPEG separator 503 to extract the TSP with the acquired PMT PID (C3), and obtains the PID of the video and audio of the program from the corresponding PMT. [Program Selection] When a program is selected, the control unit 505 selects a program by instructing the MPEG separator 503 to extract a TSP with a PID of video and audio obtained by the above method.

[0013]

However, the method of performing re-editing as in the above-mentioned prior art requires a complicated function for a device on the transmitting station side, which causes a problem that the price of the device is increased and the cost is increased. Was.

The present invention has been made in view of the above-mentioned problems in the prior art, and when retransmitting a program on another network, the transmitting station side is not required to add a function on the receiving side. It is an object of the present invention to provide a digital broadcast transmitting apparatus, a receiving apparatus, a transmission method, and a transmission method that can simplify processing and can be implemented at low cost.

[0015]

Means for Solving the Problems The first invention of the present application for solving the above problems is a digital broadcast transmitting apparatus for receiving a broadcast wave on a first network and retransmitting it on a second network. A first digital signal including information used for selecting a program compatible with the first network and a program element signal on the first network; and information used for selecting a program compatible with the second network. And a multiplexing unit for performing time division multiplexing with a second digital signal including the following.

Here, the "information used for program selection" includes program specification information (ProgramSpecific Informatio).
n, or “PSI” for short) or SI (Service Informatio)
n) Information is included. Therefore, according to the digital broadcast transmitting apparatus of the first invention of the present application, upon receiving and retransmitting a broadcast wave on the first network, the information used for selecting a program suitable for the first network is rewritten. Without retransmission on the second network, along with the information used for program selection compatible with the second network and the program element signals on the first network. Therefore, there is an advantage that the program selection can be normally performed by using the information used for the program selection suitable for the second network. Further, the information used for selecting a program suitable for the first network,
The advantage is that those that also fit into the second network can be used. Furthermore, since there is no process of rewriting information used for selecting a program suitable for the first network, there is an advantage that the processing procedure and circuit configuration are simple, and the device can be configured at low cost.

In particular, in digital broadcasting conforming to the MPEG standard, the second invention of the present application which solves the above-mentioned problem is a digital broadcasting which receives a broadcast wave on a first network and retransmits the broadcast wave on a second network. A broadcast transmitting device,
Receiving and decoding means for decoding a first NIT signal, a PAT signal, a PMT signal, and a first TS signal including a program element signal on the first network, adapted to the first network, from the received broadcast wave; NIT for generating a second TS signal including a second NIT signal suitable for the network
Signal generating means; and multiplexing means for time-division multiplexing the first TS signal output from the receiving and decoding means and the second TS signal output from the NIT signal generating means to output a plurality of TS signals. Transmission path encoding means for encoding the plurality of TS signals into a format suitable for a transmission path of a second network, and modulation means for modulating a signal encoded by the transmission path encoding means in accordance with a physical channel And a mixing unit for frequency-division multiplexing the modulated signal output from the modulation unit.

Next, a third invention of the present application and a fourth invention of the present application which receive the signal retransmitted by the digital broadcast transmitting apparatus and solve the above-mentioned problems are disclosed. That is, the third invention of the present application provides a first digital signal including information used for selecting a program compatible with the first network and a program element signal on the first network, A second digital signal containing information used for program selection to receive a time-division multiplexed signal, and separating means for separating the first digital signal and the second digital signal; Extracting means for extracting, from the digital signal, information used for selecting a program compatible with the second network, and extracting the information from the first digital signal based on the extracted information used for selecting a program compatible with the second network. A digital broadcast receiving apparatus comprising: a program selecting unit that extracts a program element signal and selects a desired program element signal.

In particular, in digital broadcasting conforming to the MPEG standard, the fourth invention of the present application which solves the above-mentioned problem is a first NIT signal conforming to a first network and a PAT signal.
A first TS signal including a signal, a PMT signal, and a program element signal on the first network and a second TS signal including a second NIT signal compatible with the second network are time-division multiplexed. Demodulation means for receiving a plurality of TS signals and demodulating the broadcast wave according to a physical channel; transmission path decoding means for decoding the output of the demodulation means into the plurality of TS signals; TS separating means for separating the signal into a signal, extracting a second NIT signal from the second TS signal separated by the separating means, and converting the PAT signal, the PMT signal, and the program element signal from the first TS signal. MPEG separating means for extracting, and the MPEG
MP for decoding the program element signal extracted by the separating means
EG decoding means; and program selection means for selecting a desired program element signal from the program element signals based on the second NIT signal, PAT signal and PMT signal extracted by the MPEG separation means. It is a digital broadcast receiving device.

[0020] The fifth invention of the present application for solving the above problems is as follows.
In the digital broadcast receiving apparatus according to the third invention of the present application,
Storage means for storing information used for selecting a program compatible with the second network extracted by the extraction means, wherein the program selection means includes a program compatible with the second network stored in the storage means It is characterized in that a desired program element signal can be selected from the program element signals based on information used for selection.

[0021] The sixth invention of the present application for solving the above problems is as follows.
In the digital broadcast receiving apparatus according to the fourth invention of the present application,
Storage means for storing the second NIT signal extracted by the MPEG separation means, wherein the program selection means determines a desired program element from the program element signal based on the second NIT signal stored in the storage means. The signal is selectable.

Therefore, according to the digital broadcast receiving apparatus of the fifth invention or the sixth invention of the present application, information (NIT signal, the PAT signal, the PMT signal, etc.) used for program selection is stored. Since it has storage means,
Each time a program is selected, it is possible to select a program without extracting such information from the received signal, reducing the load on the device,
There is an advantage that the program selection can be smoothly performed.

Next, a digital broadcast transmission system that solves the above-mentioned problems will be disclosed. A seventh invention of the present application for solving the above-mentioned problems is a transmitting means for receiving a broadcast wave on a first network and retransmitting the broadcast wave on a second network, and a receiving means for receiving a signal retransmitted by the transmitting means. A digital broadcasting transmission system comprising: a first digital signal including information used for selecting a program compatible with a first network and a program element signal on the first network; Means for time-division multiplexing a second digital signal containing information used for selecting a program compatible with a second network, wherein the receiving means comprises a first digital signal and a second digital signal. Separation means for separating a digital signal, extraction means for extracting information used for selecting a program compatible with the second network from the second digital signal, and extracted second network A digital broadcast, comprising: a program selecting unit for extracting the program element signal from the first digital signal based on information used for selecting a suitable program, and selecting a desired program element signal. Transmission method.

[0024] In particular, in digital broadcasting conforming to the MPEG standard, the eighth invention of the present application for solving the above-mentioned problem is to transmit a broadcast wave received on a first network and retransmitted on a second network. Means for receiving a signal retransmitted by the transmitting means and a receiving means for receiving a signal retransmitted by the transmitting means, wherein the transmitting means receives a broadcast wave on a first network and transmits the broadcast wave on a second network. A retransmission digital broadcast transmitting apparatus, comprising: a first NIT signal, a PAT signal, a PMT signal, and a program element signal on a first network, adapted to a first network from a received broadcast wave; Receiving and decoding means for decoding the TS signal, and a second NIT suitable for the second network
NIT signal generation means for generating a second TS signal including a signal, time-division multiplexing of the first TS signal output from the reception decoding means and the second TS signal output from the NIT signal generation means Multiplexing means for converting the plurality of TS signals into a format suitable for the transmission path of the second network, multiplexing means for outputting the plurality of TS signals, Modulation means for modulating the signal according to the physical channel, and mixing means for frequency-division multiplexing the modulated signal output from the modulation means. Demodulating means for enabling transmission to a transmission path of a second network, wherein the receiving means receives a signal transmitted by the transmitting means and demodulates the received signal in accordance with a physical channel The output of the demodulation means multiple T
Transmission path decoding means for decoding into an S signal, TS separation means for separating the plurality of TS signals into arbitrary TS signals, and second NI signal from the second TS signal separated by the separation means
MP for extracting a T signal and extracting the PAT signal, the PMT signal, and the program element signal from the first TS signal
EG separation means; MPEG decoding means for decoding the program element signal extracted by the MPEG separation means;
The second NIT signal extracted by the PEG separation means, P
A digital broadcast transmission system characterized by comprising: a program selecting means for selecting a desired program element signal from the program element signals based on an AT signal and a PMT signal.

Next, a digital broadcast transmission method for solving the above problems will be disclosed. A ninth invention of the present application for solving the above problems is a transmitting step of receiving a broadcast wave on a first network and retransmitting it on a second network, and a receiving step of receiving a signal retransmitted by the transmitting step. A method of transmitting digital broadcasting, comprising: a first digital signal including information used for selecting a program compatible with a first network and a program element signal on the first network. And time-division multiplexing a second digital signal containing information used for program selection compatible with a second network, wherein the receiving step comprises: A separation step of separating a digital signal, an extraction step of extracting information used for selecting a program compatible with the second network from the second digital signal, and an extracted second network Extracting a program element signal from the first digital signal based on information used for selecting a suitable program, and selecting a desired program element signal. Transmission method.

In particular, in digital broadcasting conforming to the MPEG standard, the tenth invention of the present application for solving the above-mentioned problem is as follows.
A digital broadcast transmission method, comprising: a transmitting step of receiving a broadcast wave on a first network and retransmitting the signal on a second network; and a receiving step of receiving a signal retransmitted by the transmitting step. The transmitting step is a digital broadcast transmitting apparatus for receiving a broadcast wave on the first network and retransmitting the broadcast wave on the second network, the first NIT adapted to the first network from the received broadcast wave.
A receiving and decoding process for decoding a first TS signal including a signal, a PAT signal, a PMT signal, and a program element signal on the first network;
A NIT signal generating step for generating a second TS signal including a T signal; a first TS signal output from the receiving and decoding step; and a second TS signal output from the NIT signal generating step.
A multiplexing step of time-division multiplexing the signal and outputting a plurality of TS signals, a transmission path encoding step of encoding the plurality of TS signals into a format suitable for a transmission path of a second network,
A modulation step of modulating a signal coded by the transmission path coding step according to a physical channel; a mixing step of frequency-division multiplexing a modulated signal output from the modulation step; and a frequency multiplexing by the mixing step. Transmitting the converted signal to a transmission path of a second network, wherein the receiving step receives the signal transmitted by the transmitting step and demodulates the received signal according to a physical channel. A demodulation process and outputting the output of the demodulation process to the plurality of T
A transmission line decoding step of decoding into an S signal, a TS separation step of separating the plurality of TS signals into an arbitrary TS signal, and a second NI signal from the second TS signal separated by the separation step.
MP for extracting a T signal and extracting the PAT signal, the PMT signal, and the program element signal from the first TS signal
An EG separation step; an MPEG decoding step of decoding the program element signal extracted by the MPEG separation step;
The second NIT signal extracted by the PEG separation process, P
A program selection step of selecting a desired program element signal from the program element signals based on an AT signal and a PMT signal.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A digital broadcast transmitting apparatus, a receiving apparatus, a transmission system and a transmission method according to an embodiment of the present invention will be described below with reference to the drawings.

Embodiment 1 First, a transmitting apparatus, a receiving apparatus, a transmission system, and a transmission method of digital broadcasting according to Embodiment 1 of the present invention will be described with reference to FIG. FIG. 1A is a block diagram illustrating a main configuration of a transmitting side (transmitting device) in a digital broadcast transmission method or transmission method according to Embodiment 1 of the present invention. FIG.
(B) is a block diagram illustrating a main configuration of a receiving side (receiving device) in a digital broadcast transmission method or transmission method according to Embodiment 1 of the present invention. In the present embodiment, a case will be described where a plurality of programs are received on the transmitting side and retransmitted on CATV.

First, the configuration and operation of the transmitting side will be described. The transmitting side (transmitting device) includes a distributor 101, receiving decoders 102-1 to 102-n, and TS multiplexers 103-1 to 103-1.
103-n, modulators 104-1 to 104-n, a mixer 105, and a program information generator 106. Therefore, unlike the prior art described above, there is no need for an MPEG separator, PID converter, and MPEG multiplexer, so that the configuration can be simplified and the processing can be simplified as described below. A received broadcast wave (for example, a BS broadcast wave) input from the receiving antenna is distributed or branched by the number of reception decoders 102-1 to 102-n in the distributor 101.
The signals are sent to the reception decoders 102-1 to 102-n. The reception decoders 102-1 to 102-n extract the signal of the specified physical channel from the received broadcast wave and decode it into a TS signal. In the present embodiment, a case of receiving a broadcast of one system is shown. However, when receiving a broadcast wave of a different system, a distributor and a reception decoder corresponding to each broadcast system are required.

The TS signals decoded by the reception decoders 102-1 to 102-n are sent to TS multiplexers 103-1 to 103-n. On the other hand, in the program information generator 106, the CATV
Are output to the TS multiplexers 103-1 to 103-n. In the TS multiplexers 103-1 to 103-n, the TS signals decoded by the reception decoders 102-1 to 102-n and the TS signal output from the program information generator 106 are multiplexed. Such a multiplexed TS signal has a plurality of T
The signals are sent as S signals to the modulators 104-1 to 104-n. In modulators 104-1 to 104-n, input T
The S signal is subjected to CATV channel coding and modulation with a carrier corresponding to the physical channel to be transmitted.
Sent to 5. Specifically, in transmission line coding, the configuration, randomization, error correction processing, and interleaving of a transmission line frame are performed, and digital modulation is performed by the 64QAM method.
In the mixer 105, the signals output from the modulators 104-1 to 104-n are frequency-multiplexed and transmitted to a transmission path. Here, TS multiplexing may be performed according to a plurality of TS multiplexing methods specified now or in the future.

Next, the operation of the receiving side (receiving device) will be described with respect to its operation. The receiving side (receiving device) is a demodulator 201
, TS separator 202, MPEG separator 203, M
It comprises a PEG decoder 204 and a control unit 205. Therefore, since the configuration is the same as that of the above-described prior art, the number of constituent circuits does not increase when applying the present invention.

On the receiving side (receiving apparatus), the following operations are performed for selecting and decoding a viewing program. The signal transmitted from the transmission path is subjected to channel selection demodulation (tuning) by the demodulator 201 in accordance with the instruction (F1) of the control unit 205, and then transmission path decoding is performed and transmitted to the TS separator 202. .

In accordance with the instruction (F2) of the control unit 205, the TS separator 202 extracts an arbitrary TS from the input plurality of TS signals.
Separate signals. At this time, if the separated TS signal is information generated by the program information generator 106 on the transmitting side, the MP signal
The signal is sent to the EG separator 203, and if the separated TS signal is a received broadcast program TS signal, the signal is sent to the MPEG decoder 204. The MPEG decoder 204 decodes the video / audio signal from the input TS and sends it to the video display unit. The control unit 205 instructs the MPEG separator 203 (F3), extracts program arrangement information (NIT in this case) from the selected TS signal (D3), and uses the information as physical channel information in CATV for program selection. .

Next, the operation of the receiving side (receiving apparatus) will be described with reference to FIG.
This will be described with reference to the flowchart shown in FIG. FIG. 2 is a flowchart showing a processing procedure on the receiving side (receiving apparatus) in the digital broadcast transmission method or transmission method according to the first embodiment of the present invention. In the following description,
The TS decoded by the receiving decoders 102-1 to 102-n on the transmission side is TSb, and the Ts generated by the program information generator 106 is Tb.
Let S be TSc.

On the receiving side, when a program is selected, TSc is selected by the TS separator 202 according to an instruction from the control unit 205, and the MP
It is sent to the EG separator 203 (A1). Further, the control unit 205 instructs the MPEG separator 203 to
The program arrangement information (here, NIT) is extracted from c, and the NIT signal is taken into the control unit 205 (A2).

The control unit 205 checks information indicating the relationship between the program number included in the received NIT signal and the physical channel on which the program is transmitted (A3). Next, the control unit 205 checks whether or not the program to be received is on the physical channel currently being received (A4). As a result of the confirmation, if there is no corresponding program on the currently received physical channel (No route of A4), the demodulator 201 is instructed based on the information of the NIT to move to the physical channel where the corresponding program exists. (A5). The reception decoder 201 performs channel selection demodulation and transmission path decoding on the signal input from the transmission path, and outputs the signal to the TS separator 202 as a plurality of TS signals. In the TS separator 202, according to the instruction of the controller 205,
If there is a corresponding program on the physical channel originally received, select the TSb of that channel, or if it moves to the physical channel where the corresponding program exists, select the TSb of the moved physical channel, and select the MPEG separator 203.
(A6). In the MPEG separator 203, the control unit 20
5 from PAT (Program A)
An association table / PMT (Program Map Table) is extracted and sent to the control unit 205 (A7). The control unit 205 determines from the received PAT / PMT the video / audio P
The ID is acquired (A8), and the MPEG separator 203 is instructed to extract video / audio information based on the PID. MPE
The G separator 203 extracts the coded video / audio signal from the TSb in accordance with an instruction from the control unit 205 and sends it to the MPEG decoder 204 (A9). The MPEG decoder 204 decodes the received video / audio signal into a baseband signal and sends it to the video display unit (A10). As described above, selection and reproduction of a program can be performed. The transmission path decoding is to decode the original TS signal from the transmission path encoded signal. Also, MPEG decoding means MP
This means decoding video / audio signals and the like encoded according to the EG standard into video / audio signals and the like before encoding. The baseband signal refers to an analog signal in a non-modulated state.

Second Embodiment Next, a transmitting apparatus, a receiving apparatus, a transmission system, and a transmission method of a digital broadcast according to a second embodiment of the present invention will be described with reference to FIG. FIG. 3 is a block diagram illustrating a configuration of a receiving side (receiving device) in a digital broadcast transmission method or transmission method according to Embodiment 2 of the present invention.

In the first embodiment, when a program is selected, the NIT is extracted from the received TS and referred to each time. However, in the present embodiment, by adding the memory 306 connected to the control unit 305, the NIT information stored in the memory 306 is referred to instead of extracting and referencing the NIT from the reception TS each time a program is selected. I do. The configuration of the present embodiment is a configuration in which a memory 306 is added to the configuration of the first embodiment. Other configurations are the same as those of the first embodiment.

The operation of the receiving side (receiving apparatus) in this embodiment is as follows. The signal transmitted from the transmission path is subjected to channel selection demodulation (tuning) by the demodulator 301 in accordance with the instruction (G1) of the control unit 305, and thereafter transmission path decoding is performed and transmitted to the TS separator 302. The TS separator 302 separates an arbitrary TS signal from the input plurality of TS signals according to the instruction (G2) of the control unit 305. At this time, the separated TS signal is transmitted to the program information generator 106 on the transmitting side.
Is transmitted to the MPEG separator 303, and if the separated TS signal is the received broadcast program TS signal, it is transmitted to the MPEG decoder 304. The MPEG decoder 304 decodes the video / audio signal from the input TS and sends it to the video display unit. The control unit 305 instructs the MPEG separator 203 (G3), extracts program sequence information (NIT in this case) from the selected TS signal (D4),
The information is stored in the memory 306 as physical channel information in CATV.

When the control unit 305 receives the program selection information by the user's operation of the remote controller or the like, the memory 306
Instructs the demodulator 301 on the CATV physical channel to be selected based on the information held in. This allows
The program can be selected without taking out the NIT from the received TS every time the program is selected. Note that the NIT is captured, for example, when a power ON / OFF operation is performed on the receiving side, the NIT is captured at a fixed cycle when a program is not viewed, or a fixed time is determined regardless of viewing. It is set so as to be taken in as appropriate, such as taking in periodically.

[0041]

As described above, according to the present invention, it is not necessary to change the TS content of media received on the other network on the transmission side, so that the processing on the transmission side can be simplified, and as a result,
There is an effect that digital retransmission broadcasting can be performed at low cost. In addition, there is no increase in the number of circuits on the receiving side, and there is only a small increase in processing software.

[Brief description of the drawings]

FIG. 1A is a block diagram illustrating a main configuration of a transmitting side (transmitting device) in a digital broadcast transmission method or transmission method according to a first embodiment of the present invention. FIG. 1B is a block diagram showing a main configuration of a receiving side (receiving apparatus) in a digital broadcast transmission method or transmission method according to the first embodiment of the present invention.

FIG. 2 is a flowchart showing a processing procedure on a receiving side (receiving device) in a digital broadcast transmission method or transmission method according to the first embodiment of the present invention.

FIG. 3 is a block diagram illustrating a configuration of a receiving side (receiving device) in a digital broadcast transmission method or transmission method according to a second embodiment of the present invention.

FIG. 4A is a block diagram showing a main configuration of a transmitting side (transmitting device) in a conventional digital broadcast transmission method or transmission method. FIG. 4B is a block diagram showing a main configuration of a receiving side (receiving device) in a conventional digital broadcast transmission system or transmission method.

[Explanation of symbols]

 Reference Signs List 101 splitter 102-1 to 102-n reception decoder 103-1 to 103-n TS multiplexer 104-1 to 104-n modulator 105 mixer 106 program information generator 201 demodulator 202 TS separator 203 MPEG separation Unit 204 MPEG decoder 205 control unit 301 demodulator 302 TS separator 303 MPEG separator 304 MPEG decoder 305 control unit 306 memory 401 distributor 402-1 reception decoder 403-1 MPEG separator 404-1 PID conversion 405- 1 MPEG multiplexer 406 TS multiplexer 408 Modulator 409-1 Program information generator 501 Demodulator 502 TS separator 503 MPEG separator 504 MPEG decoder 505 Control unit

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) EE08 KK01 KK03 MM05 MM12 SS05 SS15

Claims (10)

[Claims] 1. A digital broadcast transmitting apparatus for receiving a broadcast wave on a first network and retransmitting the broadcast wave on a second network, comprising: information used for selecting a program suitable for the first network; Multiplexing means for time-division multiplexing a first digital signal including a program element signal on a first network and a second digital signal including information used for selecting a program suitable for the second network A transmission device for digital broadcasting, comprising: 2. A digital broadcast transmitting apparatus for receiving a broadcast wave on a first network and retransmitting the broadcast wave on a second network, comprising: Receiving and decoding means for decoding a first TS signal including a NIT signal, a PAT signal, a PMT signal and a program element signal on the first network; and a second decoding means including a second NIT signal adapted to the second network. NIT signal generating means for generating a TS signal; time-division multiplexing of the first TS signal output from the receiving and decoding means and the second TS signal output from the NIT signal generating means to form a plurality of TS signals Multiplexing means for outputting, a transmission path encoding means for encoding the plurality of TS signals into a format suitable for a transmission path of a second network, and a signal encoded by the transmission path encoding means. A digital broadcast transmitting apparatus, comprising: a modulating unit that modulates according to a physical channel; and a mixing unit that frequency-division multiplexes a modulated signal output from the modulating unit. 3. A first digital signal including information used for selecting a program compatible with a first network and a program element signal on the first network, and used for selecting a program compatible with a second network. Receiving a signal that is time-division multiplexed with a second digital signal containing the information to be
Separating means for separating the first digital signal and the second digital signal; extracting means for extracting information used for selecting a program compatible with the second network from the second digital signal; A program selection unit for extracting the program element signal from the first digital signal based on information used for program selection compatible with the network, and selecting a desired program element signal. Receiver. 4. A first N compatible with the first network
A first TS signal including an IT signal, a PAT signal, a PMT signal and a program element signal on a first network, and a second T signal including a second NIT signal compatible with a second network.
Demodulation means for receiving a plurality of TS signals obtained by time-division multiplexing of S signals and demodulating the broadcast wave according to a physical channel, and transmission path decoding for decoding the output of the demodulation means into the plurality of TS signals Means for transmitting the plurality of TS signals to an arbitrary T
A TS separating unit for separating the signal into an S signal; extracting a second NIT signal from the second TS signal separated by the separating unit;
MPEG separating means for extracting a signal and the program element signal, MPEG decoding means for decoding the program element signal extracted by the MPEG separating means, a second NIT signal, a PAT signal and a second NIT signal extracted by the MPEG separating means. A digital broadcast receiving apparatus, comprising: a program selecting means for selecting a desired program element signal from the program element signals based on a PMT signal. 5. A storage device for storing information used for selecting a program suitable for a second network extracted by the extraction device, wherein the program selection device stores the second program stored in the storage device. 4. The digital broadcast receiving apparatus according to claim 3, wherein a desired program element signal can be selected from the program element signals based on information used for selecting a program suitable for a network. 6. A storage unit for storing a second NIT signal extracted by the MPEG separation unit, wherein the program selection unit is configured to output the program element signal based on the second NIT signal stored in the storage unit. 5. The digital broadcast receiving apparatus according to claim 4, wherein a desired program element signal can be selected from the following. 7. A digital broadcast transmission system, comprising: transmitting means for receiving a broadcast wave on a first network and retransmitting it on a second network; and receiving means for receiving a signal retransmitted by the transmitting means. Wherein the transmitting unit is adapted to a first digital signal including information used for selecting a program compatible with a first network and a program element signal on the first network, and adapted to a second network. Means for time-division multiplexing with a second digital signal containing information used for program selection, the receiving means comprising: separating means for separating the first digital signal and the second digital signal Extracting means for extracting, from the second digital signal, information used for selecting a program suitable for the second network; and extracting means for selecting a program suitable for the extracted second network. First extracts the program element signals from the digital signal transmission method of digital broadcasting which is characterized in being configured with a program selecting means for selecting a desired program element signals based on the information. 8. A digital broadcast transmission system comprising: a transmitting unit for receiving a broadcast wave on a first network and retransmitting the broadcast wave on a second network; and a receiving unit for receiving a signal retransmitted by the transmitting unit. Wherein the transmitting means is a digital broadcast transmitting apparatus that receives a broadcast wave on a first network and retransmits the broadcast wave on a second network, and is adapted to the first network from the received broadcast wave. First NIT signal, PAT signal, PMT
Receiving and decoding means for decoding a first TS signal including a signal and a program element signal on a first network, and a NIT signal for generating a second TS signal including a second NIT signal suitable for the second network Multiplexing means for generating a plurality of TS signals by time-division multiplexing the first TS signal output from the reception decoding means and the second TS signal output from the NIT signal generation means, Transmission path encoding means for encoding the plurality of TS signals into a format suitable for the transmission path of the second network; and modulation means for modulating the signal encoded by the transmission path encoding means according to a physical channel. Mixing means for frequency-division multiplexing the modulated signal output from the modulating means, wherein the receiving means receives the signal transmitted by the transmitting means, and Demodulating means for demodulating the plurality of TS signals into a plurality of TS signals; a TS separating means for separating the plurality of TS signals into arbitrary TS signals; A second NIT signal is extracted from the second TS signal separated by the separating means, and the PAT signal and the PAT signal are extracted from the first TS signal.
MPEG separating means for extracting the MT signal and the program element signal, MPEG decoding means for decoding the program element signal extracted by the MPEG separating means, second NIT signal and PAT signal extracted by the MPEG separating means And a program selecting means for selecting a desired program element signal from the program element signals based on the PMT signal. 9. A digital broadcast transmission method, comprising: a transmitting step of receiving a broadcast wave on a first network and retransmitting the broadcast wave on a second network; and a receiving step of receiving a signal retransmitted by the transmitting step. Wherein said transmitting step is adapted for a first digital signal including information used for selecting a program compatible with a first network and a program element signal on the first network, and adapted for a second network. A time division multiplexing process for a second digital signal including information used for program selection, and the receiving process includes a separating process for separating the first digital signal and the second digital signal. Extracting, from the second digital signal, information used for selecting a program suitable for the second network, and extracting the information used for selecting a program suitable for the extracted second network Extracting the program element signals from the first digital signal based on the information, the transmission method of digital broadcasting, characterized in that it is constituted by a program selection step of selecting a desired program element signals. 10. A digital broadcast transmission method, comprising: a transmitting step of receiving a broadcast wave on a first network and retransmitting the broadcast wave on a second network; and a receiving step of receiving a signal retransmitted by the transmitting step. Wherein the transmitting step is a digital broadcast transmitting apparatus that receives a broadcast wave on a first network and retransmits the broadcast wave on a second network, and adapts the received broadcast wave to the first network. First NIT signal, PAT signal, PMT
A receiving and decoding process for decoding a first TS signal including a signal and a program element signal on a first network, and a NIT signal generating a second TS signal including a second NIT signal suitable for a second network A generating step; a multiplexing step of time-division multiplexing the first TS signal output from the receiving and decoding step and the second TS signal output from the NIT signal generating step to output a plurality of TS signals; , The plurality of TSs
A transmission path encoding step of encoding a signal into a format suitable for a transmission path of a second network; a modulation step of modulating a signal encoded by the transmission path encoding step according to a physical channel; A mixing step of frequency-division multiplexing the modulated signal output from the step, and a step of transmitting the signal frequency-multiplexed by the mixing step to a transmission path of a second network, wherein the receiving step is ,
A demodulation step of receiving a signal transmitted in the transmission step and demodulating the received signal according to a physical channel; a transmission path decoding step of decoding an output of the demodulation step into the plurality of TS signals; A TS separation step of separating a signal into an arbitrary TS signal; extracting a second NIT signal from the second TS signal separated by the separation step; and extracting the PAT signal, the PMT signal, and the An MPEG separation process for extracting the program element signal;
An MPEG decoding step of decoding the program element signal extracted by the PEG separation step; and a desired program element signal from the program element signal based on the second NIT signal, PAT signal and PMT signal extracted by the MPEG separation step. A digital broadcast transmission method characterized by comprising a program selecting step of selecting.