JPH1023070A - Transmitting device and transmitting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the configuration of a transmitting device by providing a control means which manages packet identifiers which are added in an encoding means and indicates the addition of the respectively different packet identifiers to the plural encoding means. SOLUTION: A controller unit 42 is provided, and respective encoders 43-46 for executing an encoding processing and a multiplexer 47 for executing a multiplexing processing are provided. The controller unit 42 is a control means for managing the packet identifier (PID) value of a transport stream(TS) packet and also an additional information generating means for generating additional information, such as a program association table(PAT) and a program map table(PMT). Then, the controller unit 42 outputs a control signal S20 to the encoders 43-46, so that respectively different PID values are assigned to the respective encoders 43-46, and the PID values of the TS packets generated by the respective encoders 43-46 are prevented from overlapping.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[Table of Contents] The present invention will be described in the following order. TECHNICAL FIELD The prior art (FIGS. 9 and 10) Problems to be solved by the invention (FIGS. 11 to 15) Means for Solving the Problems Embodiments of the Invention (FIGS. 1 to 8) effect

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission apparatus and a transmission method, and is suitably applied to, for example, a digital broadcasting system for digitizing and broadcasting video and audio.

[0003]

2. Description of the Related Art In recent years, various compression coding systems have been proposed to reduce the amount of information of video and accompanying audio. A typical example is the ISO (Internationa
l MPEG2 (Moving) standardized by organizations such as the Organization for Standardization
There is a compression coding method called Picture Experts Group Phase 2). The MPEG2 system is standardized for transmitting video and audio, and is standardized for video and audio, respectively.

[0004] In recent years, a digital broadcasting system has been devised which compresses and encodes video and audio using the MPEG2 system and broadcasts them using terrestrial waves and satellite waves. In this digital broadcasting system, encoded video data and audio data are packetized for each predetermined block.
A packet sequence obtained as a result is transmitted (hereinafter, a packet sequence is called a transport stream, and a packet forming the transport stream is called a TS (Transport Stream) packet). In this case, as shown in FIG. 9, the TS packet is composed of a data portion and a header portion, and the data portion stores video data and audio data to be transmitted, and the header portion includes a synchronization byte and a packet. An identifier (hereinafter, referred to as a PID) or various other packet control data is stored. Incidentally, the synchronization byte is data indicating the start of a packet, and the PID is data indicating the content of information stored in the packet.

In the digital broadcasting system, video and audio data of a plurality of programs are multiplexed by packetizing data to be transmitted in this manner, so that a plurality of programs can be broadcast on one line. Has been made. By the way, when a plurality of programs are multiplexed, the receiving side must extract and decode a TS packet storing video and audio data of a program desired by the viewer from the transmitted TS packets. The extraction process may complicate the processing on the receiving side. In digital broadcasting systems, PSI (Program Specific Informa
) is transmitted in the form of a packet.
, A TS packet of a desired program is extracted and decoded. By the way, PSI
Is packetized, the PSI is stored in the data portion of the packet structure shown in FIG.

Here, PSI is roughly divided into PMT (Pr
ogram Map Table), PAT (Program Association Ta)
ble), CAT (Conditional Access Table), NIT
(Network Information Table). The PMT is a correspondence table (hereinafter, referred to as a table) indicating PID values of TS packets in which video and audio data constituting a program are stored. For example, a video having a program number "X" is a PID.
= “XV”, voice is a table with PID = “XA”. PAT is a table indicating the PID value of the TS packet in which the PMT is stored. For example, the PMT of the program number "0" is PID = "AA", the PMT of the program number "1" is PID = "BB", Program number "X"
Is a table in which PID = “XX”. The CAT is a table showing the PID value of the TS packet storing the decryption information for decrypting the scrambled video and audio data.
NIT is a table indicating the PID value of the TS packet in which physical information about the transmission path is stored. The PID value of the TS packet in which the NIT is stored is also PAT.
As specified by

[0007] Incidentally, the PID value of the TS packet in which the PAT and CAT are stored is predetermined as shown in FIG. That is, PAT has PID “0X0000”
CAT is stored in the TS packet, and the CAT has a PID of “0X000
1 "is stored in the TS packet. PMTs, NITs, or video data and audio data are stored in TS packets having PIDs of “0X0010” to “0X1FFE”.

When such a PSI is transmitted, the receiving side first obtains a PAT by extracting a TS packet with a PID of "0X0000" in which the PAT is stored, and then views the PAT by referring to the PAT. A user extracts a TS packet in which a PMT of a desired program is stored to obtain a PMT. Next, based on the PMT, a TS packet in which video and audio data of a program desired by the viewer is stored is examined, and the TS packet is extracted to obtain video and audio data, which is decoded. Thereby, the receiving side can easily reproduce the program desired by the viewer.

[0009]

In order to realize a digital broadcasting system as described above, a configuration as shown in FIG. 11 is generally considered. That is, as shown in FIG. 11, the digital broadcasting system 1 encodes and transmits video and audio data, and transmits data transmitted from the transmission device 2 installed in each home or the like to the transmission device 2 corresponding to a broadcasting station. And a receiving device 3 for receiving and decoding the received data.

As the transmission device 2, a configuration as shown in FIG. 12 is generally considered. That is, as shown in FIG. 12, the transmission apparatus 2 encodes the input video and audio data S1 to S4 of each program by the MPEG2 system, and converts the encoded data into packets for each predetermined block and outputs the encoded data. 7 and the transport streams S5 to S8 output from the encoders 4 to 7 are multiplexed to 1
A multiplexer 8 for converting the transport stream S9 into one transport stream S9, a modulator 9 for modulating the transport stream S9 by a predetermined modulation method, and a transmission antenna 10 for transmitting a transmission signal S10 output from the modulator 9. Be composed.

In this case, the encoders 4 to 7 have basically the same configuration as shown in FIG. 13, and are configured to separately encode the input video and audio data S1 to S4. I have. Hereinafter, since the configuration is the same,
Here, the encoder 4 will be described. The input video and audio data S1 is first input to the switch 11.
The switch 11 supplies the video data S1A of the video and audio data S1 to the video encoder 12, and supplies the audio data S1B to the audio encoder 13. The video encoder 12 converts the input video data S1A into an MPE
In addition to the sequential encoding based on the G2 system, the encoded video data is packetized for each predetermined block in a packet structure as shown in FIG. 9, and the resulting transport stream S11 is output. The audio encoder 13 converts the input audio data S1B into MPEG.
2, and the encoded audio data is packetized for each predetermined block in a packet structure as shown in FIG. 9, and the resulting transport stream S12 is output. .

Further, the PAT /
The PMT generator 14 generates a PMT or a PAT corresponding to the video TS packet and the audio TS packet generated by the video encoder 12 and the audio encoder 13, and converts the PMT or PAT into a packet having the same packet structure as shown in FIG. The resulting transport stream S1
3 is output. At that time, the PAT / PMT generator 14
First, a PMT indicating the PID value of a TS packet in which video data and audio data are stored is generated, and then a PAT indicating the PID value of the TS packet in which the PMT is stored is generated, packetized, and output.

The null packet generator 15 generates a blank packet having no special meaning as data (hereinafter referred to as a null packet), and generates a null packet when the transmission data amount is less than the transmission capacity. And the resulting transport stream S14
Is output. The transport streams S11 to S14 thus generated by the video encoder 12, the audio encoder 13, the PAT / PMT generator 14, and the null packet generator 15 are respectively connected to the switch 16
Are multiplexed by sequentially switching the switches 16 and converted into one transport stream S5. Incidentally, when the video encoder 12, the audio encoder 13, the PAT / PMT generator 14 and the null packet generator 15 are connected to the switch 16, the respective transport streams S11 to S1 are provided.
4 is output.

On the other hand, the multiplexer 8 has a configuration as shown in FIG. 14, and is configured to input the transport streams S5 to S8 supplied from the encoders 4 to 7 to the switches 17 to 20, respectively. The switch 17 supplies a video and audio TS packet S5A, which is element data of the transport stream S5, to a buffering memory (FIFO) 21, and a PAT or PMT TS packet S5B which is system data of the transport stream S5. Is supplied to a buffering memory (FIFO) 22.

Similarly, the switch 18 supplies the video and audio TS packets S6A of the transport stream S6 to the memory (FIFO) 23, and stores the PAT and PMT TS packets S6B of the transport stream S6 in the memory (FIFO). (FIFO) 24. The switch 19 stores the video and audio TS packets S7A of the transport stream S7 in a memory (FIFO).
25 of the transport stream S7.
AT or PMT TS packet S7B is stored in memory (FIF
O) 26. The switch 20 is a video and audio TS packet S of the transport stream S8.
8A is supplied to the memory (FIFO) 27, and the TS packet S8B of the PAT or PMT of the transport stream S8 is supplied to the memory (FIFO) 28. By switching the switches 17 to 20 in this manner, the multiplexer 8 outputs the transport streams S5 to S8.
Separation work.

The memories 21 to 28 perform a buffering process by temporarily storing the input TS packets. Of the memories 21 to 28, the memories 21, 2
Reference numerals 3, 25 and 27 output the accumulated TS packets in accordance with the multiplexing timing by the switch 29 at the subsequent stage. On the other hand, the memories 22, 24, 26, and 28 store the stored TS packets at a predetermined timing in a subsequent P
Output to AT / PMT regenerator 30.

The PAT / PMT regenerator 30 is a circuit for regenerating the PAT or PMT generated for each program. The PAT / PMT regenerator 30 converts the PAT and PMT of each program from the supplied TS packets.
MTs are extracted, and PAT and PM are newly added with reference to them.
Regenerate T, packetize it and output. More specifically, PATs generated for each program are combined into one, and a PID regenerator 32 described later is used.
In accordance with the change of the PID value performed by
Changes the PID value of the PMT written in. Similarly, for the PMT, the PID value of the TS packet such as video and audio written in the PMT is changed in accordance with the change of the PID value performed by the PID regenerator 32. As a result, PAT, P generated for each program
The MT can be adjusted to the multiplexed transport stream S9. Note that if a plurality of PATs exist for one transport stream S9, there is a possibility that the receiving side may not be able to know which one to refer to. PA per port stream S9
This is avoided by setting T to one.

The PAT and PMT TS packets (S15) thus regenerated are supplied to a buffering memory (FIFO) 31. The memory 31 temporarily stores the supplied PAT and PMT TS packets,
The signal is output in accordance with the multiplexing timing by the switch 29 at the subsequent stage. The switch 29 is switched at a predetermined timing, whereby each of the memories 21, 23, 25, 27 and 3 is switched.
The TS packet output from 1 is multiplexed, converted into one transport stream S16, and output to the PID regenerator 32. Incidentally, the null packet generator 33 is a circuit that generates a null packet when the contents of the memories 21, 23, 25, 27 and 31 are empty, and the switch 29 is a circuit where the contents of the memories 21, 23, 25, 27 and 31 are empty. Sometimes a transport stream S consisting of null packets
By selecting No. 17, shortage of transmission capacity is compensated.

The PID regenerator 32 re-adds the PID added to each TS packet of the input transport stream S16 so that the PID values do not overlap, and the resulting transport stream S9 Is output. For example, as shown in FIG. 15, in the encoders 4 to 7, a PID of "0X0100" is uniformly added to a video TS packet, and a PID of "0X0101" is uniformly added to an audio TS packet. Since the same PID value is added between different programs as it is, when a desired program is decoded on the receiving side, there is a problem that if a wrong program is decoded by mistake, This may cause incorrect decoding.

For this reason, the PID regenerator 32 re-adds a new PID of “0X0102” to the video TS packet generated by the encoder 5 and re-adds the audio TS packet generated by the encoder 5. New "0X0103"
The PID of “0X0104” is newly added to the video TS packet generated by the encoder 6, and the “TSX” is newly added to the audio TS packet generated by the encoder 6. 0X0105 ”is re-added, and a TS packet of video generated by the encoder 7 is newly added, and a PID of“ 0X0106 ”is newly added to the TS packet of audio generated by the encoder 7. Is re-added with the PID of “0X0107”. This gives the PID
The regenerator 32 avoids duplication of the PID values so that decoding can be performed correctly on the receiving side. The PID regenerator 32 changes the PID value of the TS packet storing the PMT to a predetermined PID value so as not to overlap.

After being converted into one stream by multiplexing in this way, the transport stream S9 whose PID value has been changed is supplied to the modulator 9 as described above, where it is subjected to predetermined modulation. After that, it is transmitted via the transmission antenna 10. Thus, in the transmission device 2,
By multiplexing the transport streams S5 to S8 generated by the encoders 4 to 7 by the multiplexer 8, video and audio data of a plurality of programs are transmitted on one line. At that time, each encoder 4
7 are regenerated by the PAT / PMT regenerator 30 of the multiplexer 8 to regenerate the PAT and PMT for each program generated by the multiplexed transport stream S.
PAT and PMT that match 9 are added. Also, T added in the same manner in each of the encoders 4 to 7
The PID value of the S packet is re-added by the PID regenerator 32 of the multiplexer 8 so that the PID value does not overlap in the transport stream S9.

In the transmission device 2, each encoder 4
7, the PAT and PMT individually generated are re-generated to thereby generate the multiplexed transport stream S9.
PAT and PMT are added so that the configuration is complicated. Similarly, in the transmission device 2, the PI added once by each of the encoders 4 to 7 is used.
Duplication of PID values is avoided by re-adding D, and therefore, the configuration cannot be prevented from becoming complicated.

The present invention has been made in view of the above points, and an object of the present invention is to propose a transmission apparatus and a transmission method that can further simplify the configuration.

[0024]

In order to solve the above-mentioned problems, according to the present invention, input data is encoded, and the encoded data is packetized for each predetermined block.
A plurality of encoding means for adding and outputting packet identifiers to the generated packets, and managing the packet identifiers to be added by the encoding means, so that different packet identifiers are respectively added to the plurality of encoding means. A control means for instructing and a multiplexing means for multiplexing a plurality of packet strings output from a plurality of encoding means to convert them into one packet string and sending out the packet string are provided. In this way, the control means manages the packet identifiers and instructs a plurality of encoding means to add different packet identifiers, and the plurality of encoding means adds the packet identifiers based on the instruction. By doing so, it is possible to easily avoid duplication of packet identifiers without regenerating the packet identifier added by each encoding means.

Also, in the present invention, a plurality of encoding means for encoding input data, packetizing the encoded data for each predetermined block, and adding a packet identifier to the generated packet and outputting the packet. An additional information generation unit that generates additional information indicating a correspondence between input data and a packet identifier based on the packet identifier added by the encoding unit, converts the additional information into a packet, and outputs the packet. A multiplexing means for multiplexing a plurality of packet sequences output from the above and a packet sequence of additional information to convert the packet sequence into one packet sequence and transmitting the packet sequence is provided. In this manner, the additional information is not generated by each of the plurality of encoding units, but the additional information generation unit is provided separately from the encoding unit, and the additional information is generated based on the packet identifier added by the encoding unit. By doing so, it is possible to generate additional information that matches the multiplexed packet sequence without regenerating the additional information.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

In FIG. 1, in which parts corresponding to those in FIG. 11 are assigned the same reference numerals, reference numeral 40 designates a digital broadcasting system according to this embodiment as a whole, wherein video and audio data of a plurality of programs are transmitted by a transmission device 41. The multiplexed data is transmitted using satellite waves, and the receiving device 3 reproduces the program desired by the viewer by extracting and decoding video and audio data of the desired program desired by the viewer from the received data. I do.

FIG. 2 in which parts corresponding to those in FIG. 12 are denoted by the same reference numerals, shows the configuration of a transmission apparatus 41 according to this embodiment. As shown in FIG. 2, in this transmission apparatus 41, a controller unit 42 is newly provided, and the configurations of encoders 43 to 46 for performing an encoding process and a multiplexer 47 for performing a multiplexing process are shown in FIG. Has been changed for the transmission device 2.

The controller unit 42 is a control means for managing the PID value of the TS packet and an additional information generating means for generating additional information such as PAT and PMT. The controller unit 42 assigns different PID values to the respective encoders 43 to 46 by outputting the control signal S20 to the respective encoders 43 to 46, whereby the PID values of the TS packets generated by the encoders 43 to 46 are assigned. Should not overlap. For example, as shown in FIG. 3, the controller unit 42 uses the control signal S20 to send the PID “0X0100” to the video TS packet to the encoder 43 and the audio T
An instruction is issued to add a PID of “0X0101” to the S packet. In addition, it instructs the encoder 44 to add the PID “0X0102” to the video TS packet and the PID “0X0103” to the audio TS packet. Similarly, for the encoder 45, the PID “0X0104” is assigned to the video TS packet, and “0X010” is assigned to the audio TS packet.
An instruction to add a PID of “5” is issued to the encoder 46, and a PI of “0X0106” is added to the video TS packet.
D is instructed to add a PID of "0X0107" to the audio TS packet. The controller unit 4
For example, RS-232C, RS-422A, or the like is used as a communication protocol for the control signal S20 output by the control unit 2.

Further, the controller unit 42 generates a PAT and a PMT corresponding to the multiplexed transport stream S9 based on the PID value allocated as described above, and packetizes the generated PAT and the PMT. The transport stream S21 is output to the multiplexer 47. More specifically, since the controller unit 42 assigns PID values to the encoders 43 to 46, the controller unit 42 knows in advance the PID values of the TS packets of each program output from the encoders 43 to 46. The controller unit 42 sets the P
Based on the ID value, a PMT indicating a PID value of a TS packet storing video and audio data constituting each program is generated, and a PAT indicating a PID value of a TS packet storing the PMT is generated. The generated PMT
And PAT are converted into a packet by the packet structure shown in FIG. The controller unit 42 has a PAT
PID of “0X0000” for the TS packet in which is stored
Is added to the TS packet in which the PMT is stored, and a PID that does not overlap with video and audio is added from “0X0010” to “0X1FFE” (see FIG. 10).

The encoders 43 to 46 are means for encoding video and audio data. The encoders 43 to 46 encode the input video and audio data S1 to S4 of each program in the MPEG2 system, respectively. Are packetized for each predetermined block by the packet structure shown in FIG. At that time, each of the encoders 43 to 46 adds a PID to the TS packet based on the PID value specified by the controller unit 42. The encoders 43 to 46 only encode and packetize video and audio data and do not generate PAT or PMT. Accordingly, the transport streams S22 to S25 output from the encoders 43 to 46 include TSs of PAT and PMT.
The packet is not included, and the T
Only S packets and audio TS packets are included.

The multiplexer 47 is a multiplexing means.
Video and audio TS supplied from encoders 43 to 46
Transport streams S22 to S composed of packets
25 and the PA supplied from the controller unit 42.
By multiplexing with a transport stream S21 composed of TS packets of T or PMT, it is converted into one transport stream S9 and output to the modulator 9.

The modulator 9 performs, for example, QPSK (Quadrature Phase Shift Keying) on a predetermined carrier based on the input transport stream S9, and then changes the frequency of the carrier to that of the satellite wave. Frequency conversion into a frequency band, and the resulting transmission signal S10
Is output. Transmission signal S1 output from modulator 9
0 is supplied to the transmitting antenna 10 and the transmitting antenna 1
0.

On the other hand, as shown in FIG.
The reception signal S3 is composed of a reception antenna 50, a demodulator 51, and a decoder 52, and is received by the reception antenna 50.
0 is input to the demodulator 51. The demodulator 51 converts the frequency of the received signal S30 into a baseband signal, and then demodulates the baseband signal to restore a transport stream S31 corresponding to the transport stream S9 on the transmission side. S31 is output to the decoder 52.

The decoder 52 is a decoding means, and in accordance with a viewer's instruction input from an instruction unit (not shown), a TS packet and audio of a video constituting a program designated by the viewer from the transport stream S31. The video and audio data S32 is reproduced by extracting the TS packet and decoding it. At this time, the decoder 52 first obtains the PAT by extracting the TS packet storing the PAT, and then extracts the TS packet storing the PMT of the designated program by referring to the PAT. I do. Then, the PMT values of the video TS packet and the audio TS packet constituting the designated program are checked by referring to the obtained PMT, and the TS packets constituting the program are extracted based on the examination result. The video and audio data S32 reproduced in this manner is supplied to, for example, a television device or the like, where it is broadcast.

Here, the controller unit 42 of the transmission device 41 will be specifically described with reference to FIG. The controller unit 42 and the controller 54
An AT / PMT generator 55 is provided. The controller 54 corresponds to a control means, and as described above, the P which instructs the encoders 43 to 46
The ID value is managed, and a different PID value is assigned to each of the encoders 43 to 46 by outputting the control signal S20. Further, the controller 54 notifies the PAT / PMT generator 55 of the PID value assigned to each of the encoders 43 to 46 by outputting the control signal S35.

The PAT / PMT generator 55 is an additional information generating means, and the PI assigned to each of the encoders 43 to 46 by the control signal S35 supplied from the controller 54.
Know the D value, and based on the PID value, the PID of the TS packet storing the video and audio data that make up each program.
A PMT indicating the value is generated, and a PAT indicating the PID value of the TS packet in which the PMT is stored is generated.
Then, the PAT / PMT generator 55 generates the generated PAT.
And PMT are converted to TS packets, and the resulting transport stream S21 is converted to a multiplexer 47.
Output to Note that the PAT / PMT generator 55
When packetizing T or PMT, a PID of “0X0000” is added to the TS packet in which the PAT is stored,
"0X0010"-for the TS packet in which MT is stored
A PID of “0X1FFE” that does not overlap with video and audio is added.

Next, the encoder 4 of the transmission device 41 described above is used.
3 to 46 will be described in detail with reference to FIG. However, since the encoders 43 to 46 have the same configuration, the encoder 43 will be described here. In the encoder 43, first, the input video and audio data S 1 is input to the switch 11. The switch 11 supplies the video data S1A of the video and audio data S1 to the video encoder 60 and supplies the audio data S1B to the audio encoder 61.
To supply.

A control signal S20 from the controller unit 42 is input to the video encoder 60, and the control signal S20 instructs the TS packet to add a PID of "0X0100" to the TS packet. The video encoder 60 sequentially encodes the input video data S1A based on the MPEG2 system, converts the coded video data into packets for each predetermined block in a packet structure shown in FIG. 9, and obtains the resulting transport stream S40.
Is output. At this time, the video encoder 60 adds a PID of “0X0100” to the TS packet of the generated video.

A control signal S20 from the controller unit 42 is also input to the audio encoder 61, and the control signal S20 instructs the TS packet to add a PID of "0X0101" to the TS packet.
The audio encoder 61 receives the input audio data S1
B is sequentially encoded based on the MPEG2 audio standard system, the encoded audio data is packetized for each predetermined block in a packet structure shown in FIG. 9, and the resulting transport stream S41 is output. At this time, the audio encoder 61 adds a PID of “0X0101” to the TS packet of the generated audio.

The null packet generator 15 is a circuit for generating a null packet. If the data amount of the transport streams S40 and S41 is less than the transmission capacity, the null packet generator 15 generates a null packet and outputs the resulting transport stream S14. I do. The switch 16 multiplexes the transport streams S40, S41, and S14 output from the video encoder 60, the audio encoder 61, and the null packet generator 15 by switching at a predetermined timing, and converts the transport streams into one transport stream S22. Incidentally, when the switch 16 is connected, the video encoder 60, the audio encoder 61 and the null packet generator 15 transmit the respective transport streams S40, S41, S1.
4 is output. Thereby, the transport streams S40, S41, and S14 can be multiplexed without information loss.

Next, the multiplexer 47 of the transmission device 41 will be described in detail with reference to FIG. The multiplexer 47 includes a buffering memory (FIFO) 63, 2
1, 23, 25 and 27 and a null packet generator 33
And a switch 29. Compared to FIG. 14, the memories 22, 24, 26 and 28, PAT / PM
The T regenerator 30 and the PID regenerator 32 are eliminated.

The transport stream S21 composed of the PAT and PMT TS packets supplied from the controller unit 42 is inputted to the memory 63, and the transport stream S22 composed of the video and audio TS packets supplied from the respective encoders 43 to 46. ~ S25
Are input to the memories 21, 23, 25, and 27, respectively. The memories 63, 21, 23, 25, and 27 perform buffering processing by temporarily storing the input transport streams S 21 to S 25, respectively, and match the transport streams with the timing of multiplexing by the switch 29 in the subsequent stage. S21 to S25 are output.

The switch 29 is switched at a predetermined timing so that each of the memories 63, 21, 23, 25 and 2 is switched.
7 are transport streams S21 to S21 output from
25, and one transport stream S9
Convert to Incidentally, the null packet generator 30 is a circuit for generating a null packet when the contents of the memories 63, 21, 23, 25 and 27 are empty, and the switch 29 is a circuit for generating the contents of the memories 63, 21, 23, 25 and 27. Transport stream S consisting of null packets when empty
By selecting No. 17, shortage of transmission capacity is compensated.

In the above configuration, the controller unit 42 manages the PID value of the TS packet generated by each of the encoders 43 to 46, and controls each of the encoders 43 to 46.
Are instructed to add different PID values. Specifically, for the encoder 43, a PID of “0X0100” is assigned to the video TS packet, and “0X0100” is assigned to the audio TS packet.
The PID of “0X0102” is instructed to the encoder 44 to add the PID of “0X0102” to the video TS packet.
An instruction is issued to add an ID and a PID of “0X0103” to a voice TS packet. In addition, it instructs the encoder 45 to add the PID “0X0104” to the video TS packet and the PID “0X0105” to the audio TS packet, and instructs the encoder 46 to add the PID “0X0105” to the video TS packet. The PID of “0X0106” is added to the audio TS packet as “0X0106”.
[0107] An instruction to add a PID of “0107” is issued.

Each of the encoders 43 to 46 receiving this encodes the video and audio data S1 to S4 of each of the inputted programs, and forms the encoded video and audio data into packets for each predetermined block. The specified PID is added to the TS packet. Each encoder 43 ~
Transport stream S22 output from
Each of S25 is input to the multiplexer 47, where it is multiplexed and converted into one transport stream S9. In this case, since different PIDs are added to the TS packets based on the instruction of the controller unit 42 in each of the encoders 43 to 46, the TS packets are multiplexed by the multiplexer 47 and converted into one transport stream S9. However, the PID of the TS packet does not overlap in the transport stream S9. Thereby, it is possible to prevent the receiving apparatus 3 from decoding a wrong program by mistake.

In this way, in the transmission apparatus 41, different PID values are specified by the controller unit 42, and the encoders 43 to 46 specify the TS value based on the specification.
By adding the PID to the packet, duplication of the PID can be avoided beforehand without regenerating the PID in the multiplexer as in the configuration shown in FIG.
Therefore, the configuration of the transmission device 41 can be further simplified.

In the transmission device 41, the controller unit 42 instructs the encoders 43 to 46 to send P
Based on the ID value, a PMT and a PAT that match the contents of the multiplexed transport stream S9 are generated, and the generated PMT and PAT are packetized and output. The PMT and PAT TS packets (S21) are supplied to the multiplexer 47, and the video and audio TS packets (S22 to S2) supplied from the respective encoders 43 to 46.
5).

As described above, in the transmission device 41, the PMT and PAT that match the contents of the multiplexed transport stream S9 are generated by the controller unit 42, and the PMT and PAT are simply generated by the multiplexer 47.
The T TS packets are only multiplexed into the video and audio TS packets. Thereby, in this transmission device 41,
The configuration of the multiplexer 47 and each of the encoders 43 to 46 is simpler than the case where the PMT and PAT generated by each of the encoders 4 to 7 are regenerated by the multiplexer 8 as in the configuration shown in FIG. Can be

Thus, the configuration of the transmission device 41 can be simplified as compared with the transmission device 2 shown in FIG. Incidentally, according to experiments, it has been confirmed that the circuit configuration can be simplified to about 1/3 in the case of the configuration as in this embodiment as compared with the configuration of FIG.

According to the above configuration, a different PID value is instructed to each of the encoders 43 to 46 by the controller unit 42, and each of the encoders 43 to 46 adds a PID to the TS packet based on the instruction. , The TS generated by each of the encoders 43 to 46
When packets are multiplexed, duplication of PIDs can be avoided without regenerating PIDs. Since the PID is not regenerated in this way, the configuration of the transmission device 41 can be simplified.

The PMT combined with the multiplexed transport stream S9 by the controller unit 42
And PAT, and the multiplexer 47 simply multiplexes the PMT and PAT TS packets into the video and audio TS packets supplied from each of the encoders 43 to 46.
The PMT and the PAT combined with the multiplexed transport stream S9 can be generated without regenerating the AT,
Accordingly, the configuration of the transmission device 41 can be simplified.

In the above-described embodiment, the case where the transport streams S21 to S25 input in the multiplexer 47 are simply multiplexed has been described. However, the present invention is not limited to this. For example, as shown in FIG.
In the multiplexer 47, the memories 63, 21, 23,
Switches 65 to 69 may be provided in front of the stages 25 and 27, and the null packets in the transport streams S21 to S25 may be removed by the switches 65 to 69. In this way, when there is a possibility that the data amount of the transport stream S9 exceeds the transmission capacity, it is possible to adjust the data amount of the transport stream S9 by removing the null packet and easily avoid the transmission capacity excess. be able to.

In the above embodiment, the transmission device 4
1, the case where the transport stream S9 is transmitted using a satellite wave has been described. However, the present invention is not limited to this. For example, the transport stream S9 may be transmitted using a terrestrial wave or transmitted using a predetermined wired cable. Alternatively, transmission may be performed using a predetermined public line network. In short, what is necessary is just to transmit the transport stream S9 to a predetermined transmission path.

In the above-described embodiment, the case where QPSK modulation is used as the modulation method of the modulator 9 has been described. However, the present invention is not limited to this, and the modulation method of the modulator 9 is, for example, QAM modulation (Quadrature Amplitude). Modulat
ion: Quadrature amplitude modulation or OFDM modulation (Orthogonal Fre)
quency Division Multiplex (orthogonal frequency division multiplex modulation) may be used.

Further, in the above-described embodiment, the case where four inputted video and audio data S1 to S4 are multiplexed, that is, the case of four-channel multiplexing has been described. Channel multiplexing or 8-channel multiplexing may be used. In short, the number of channels is not limited. Incidentally, in the present invention,
Since the PAT / PMT generator in the encoder can be omitted, the overall configuration can be simplified as the number of channels increases.

In the above-described embodiment, the case where the null packet generators 15 and 33 are provided in the encoders 43 to 46 and the multiplexer 47 has been described. However, the present invention is not limited to this. Video and audio data S1 to S1 to be input in advance so that the capacity is not insufficient.
In the case where the data amount of No. 4 is controlled, the null packet generator may not be provided in the encoder and the multiplexer.

In the above-described embodiment, the case has been described where the PID value is managed by the controller unit 42 and additional information such as PAT and PMT is generated. However, the present invention is not limited to this. Alternatively, only one of them may be performed by the controller unit. Even if only one of them is performed in this way,
The configuration of the transmission device can be simplified at least as compared with the configurations shown in FIGS.

In the above embodiment, the first correspondence table (PMT) indicating the PID value of the TS packet storing the video and audio data (S1 to S4) as the additional information.
And the PI of the TS packet in which the first correspondence table is stored
The case where the present invention is applied to the transmission apparatus 41 which generates and transmits the second correspondence table (PAT) indicating the D value has been described. However, the present invention is not limited to this, and the present invention is not limited to this. The present invention may be widely applied to a transmission apparatus that generates and transmits additional information indicating a correspondence.

In the above-described embodiment, the case where a plurality of input video and audio data are multiplexed has been described. However, the present invention is not limited to this. For example, only a plurality of input video data are multiplexed. Alternatively, only a plurality of input audio data may be multiplexed.

Further, in the above-described embodiment, the case where the present invention is applied to the transmission device 41 for multiplexing and transmitting video and audio data has been described. However, the present invention is not limited to this, and the present invention is not limited thereto. The present invention may be widely applied to a transmission device that multiplexes and transmits data.

[0062]

As described above, according to the present invention, control means for managing packet identifiers to be added by the encoding means and instructing a plurality of encoding means to add different packet identifiers to each other is provided. By doing so,
Even if the packet identifier is not regenerated, duplication of the packet identifier can be easily avoided. Since the packet identifier is not regenerated in this way, the configuration of the transmission device can be further simplified. Further, according to the present invention, there is provided additional information generating means for generating additional information indicating a correspondence relationship between input data and a packet identifier based on a packet identifier added by the encoding means, converting the additional information into a packet, and outputting the packet. With this arrangement, it is possible to generate additional information that matches the multiplexed packet sequence without regenerating the additional information. Because the additional information is not regenerated for each
The configuration of the transmission device can be further simplified.

[Brief description of the drawings]

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

FIG. 2 is a block diagram illustrating a transmission device according to an embodiment.

FIG. 3 is a table showing PID values assigned to each encoder.

FIG. 4 is a block diagram showing a configuration of a receiving device.

FIG. 5 is a block diagram showing a configuration of a controller unit according to the embodiment.

FIG. 6 is a block diagram showing a configuration of an encoder according to an embodiment.

FIG. 7 is a block diagram showing a configuration of a multiplexer according to an embodiment.

FIG. 8 is a block diagram showing a configuration of a multiplexer according to another embodiment.

FIG. 9 is a schematic diagram illustrating a structure of a TS packet.

FIG. 10 is a table showing a correspondence relationship between a PID value and information stored in a TS packet of the PID value.

FIG. 11 is a block diagram showing a configuration of a digital broadcasting system.

FIG. 12 is a block diagram showing a configuration of a transmission device.

FIG. 13 is a block diagram showing a configuration of an encoder.

FIG. 14 is a block diagram showing a configuration of a multiplexer.

FIG. 15 is a table provided for explanation of PID regeneration.

[Explanation of symbols]

1, 40 digital broadcasting system, 2, 41 transmission device, 3 reception device, 4-7, 43-46 encoder, 8, 47 multiplexer, 9 modulator,
10: transmitting antenna, 12, 60 ... video encoder, 13, 61 ... audio encoder, 14, 55
... PAT / PMT generator, 30 PAT / PMT regenerator, 32 PID regenerator, 42 controller unit, 50 receiving antenna, 51 demodulator,
52: a decoder, 54: a controller.

Claims (10)

[Claims] A plurality of encoding means for encoding inputted input data, packetizing the encoded data for each predetermined block, adding a packet identifier to the generated packet, and outputting the packet; Control means for managing packet identifiers added by the encoding means and instructing the plurality of encoding means to add different packet identifiers; and a plurality of packets output from the plurality of encoding means. A transmission apparatus comprising: multiplexing means for converting a packet sequence into one packet sequence by multiplexing the sequence and transmitting the packet sequence. 2. The transmission apparatus according to claim 1, wherein said input data comprises video data and / or audio data. 3. A plurality of encoding means for encoding input input data, packetizing the encoded data for each predetermined block, adding a packet identifier to the generated packet, and outputting the packet. Based on the packet identifier added by the encoding means,
Additional information generation means for generating additional information indicating the correspondence between the input data and the packet identifier, converting the additional information into packets, and outputting the information; a plurality of packet sequences output from the plurality of encoding means; A transmission device comprising: a multiplexing unit that converts a packet sequence of additional information into one packet sequence by multiplexing the packet sequence and transmits the packet sequence. 4. A first correspondence table indicating a packet identifier of a packet in which the input data is stored, and a second correspondence table indicating a packet identifier of a packet in which the first correspondence table is stored. The transmission device according to claim 3, comprising a table. 5. The transmission apparatus according to claim 3, wherein said input data comprises video data and / or audio data. 6. A plurality of encoding steps for encoding inputted input data, packetizing the encoded data for each predetermined block, adding a packet identifier to the generated packet, and outputting the packet. A control step of managing packet identifiers to be added in the above-mentioned coding steps, and instructing each of the above-mentioned plurality of coding steps to add a different packet identifier; and a plurality of packets generated by the above-mentioned plurality of coding steps. By multiplexing the sequence, it is converted into one packet sequence,
A multiplexing step for transmitting the packet sequence. 7. The transmission method according to claim 6, wherein said input data comprises video data and / or audio data. 8. A plurality of encoding steps for encoding inputted input data, packetizing the encoded data for each predetermined block, and adding a packet identifier to the generated packet and outputting the packet. An additional information generation step of generating additional information indicating a correspondence between the input data and the packet identifier based on the packet identifier added by the encoding step, packetizing the additional information, and outputting the packet; A plurality of packet sequences generated in the encoding step and a packet sequence of the additional information are multiplexed to convert the packet sequence into one packet sequence, and a multiplexing step for transmitting the packet sequence is provided. Transmission method to do. 9. A first correspondence table indicating a packet identifier of a packet in which the input data is stored, and a second correspondence table indicating a packet identifier of a packet in which the first correspondence table is stored. The transmission method according to claim 8, comprising a table. 10. The transmission method according to claim 8, wherein said input data comprises video data and / or audio data.