Transmission system, transmission method, inserter, and data construction device

Abstract

To provide a concrete transmission system or the like for inserting (multiplexing) a 2K broadcast signal into a broadcast TS while keeping interchangeability with the broadcast TS for 4K broadcast.SOLUTION: A transmission system according to an embodiment includes an inserter and a construction device. The inserter divides the first transmission main signal to generate a plurality of second transmission main signals, and transmits a second broadcast TS from the second transmission main signals and configuration information of the first transmission main signals. The construction device receives the second broadcast TS, extracts the plurality of second transmission main signals and the configuration information from the second broadcast TS, and constructs the first transmission main signal using the configuration information and the plurality of second transmission main signals.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] FIELD Embodiments of the present invention relate to a transmission system, a transmission method, an inserter, and a data construction device. [Background technology]

[0002] In recent years, in technical studies on the enhancement of terrestrial digital television broadcasting, an advanced broadcasting introduction method has been considered, which would transmit 4K broadcasts on the same channel as existing 2K broadcasts. In this advanced broadcasting introduction method, the feasibility of relay technology that transmits a broadcasting TS with a 4K broadcast signal inserted while maintaining compatibility with the current broadcasting TS is being studied, so as not to affect the current STL / TTL line facilities. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5350869 Summary of the Invention [Problem to be solved by the invention]

[0004] We are looking forward to concrete proposals for transmission systems and methods that will realize the above relay technology.

[0005] The problem to be solved by the present invention is to provide a specific transmission system etc. for inserting (multiplexing) a 4K broadcast signal into a broadcast TS while maintaining compatibility with a broadcast TS for 2K broadcasting. [Means for solving the problem]

[0006] A transmission system according to an embodiment includes an inserter and a construction device. The inserter divides a first transmission main signal to generate multiple second transmission main signals, multiplexes the second transmission main signals and configuration information of the first transmission main signals into a first broadcast TS (Transport Stream), and transmits the second broadcast TS. The construction device receives the second broadcast TS, extracts the multiple second transmission main signals and the configuration information from the second broadcast TS, and constructs the first transmission main signal using the configuration information and the multiple second transmission main signals. [Brief explanation of the drawings]

[0007] [Figure 1] 1 is a configuration diagram for explaining an outline of a transmission system according to a first embodiment. [Figure 2] FIG. 2 is a diagram illustrating the data structure of a TS packet used in a broadcast TS. [Figure 3] 3 is a diagram showing the structure of an information portion as actual data of the TS packet shown in FIG. 2. FIG. [Figure 4] FIG. 1 is a diagram for explaining the data structure of a transmission main signal used in 4K broadcasting. [Figure 5] FIG. 1 is a diagram showing an example of a signal block as a 4K broadcast signal having the same basic structure as the transmission main signal. [Figure 6] FIG. 2 is a functional block diagram of the inserter according to the first embodiment. [Figure 7] 10A and 10B are diagrams for explaining a division process executed by a division unit and an insertion process executed by a divided data insertion unit. [Figure 8] FIG. 2 is a functional block diagram of a first modulation device according to the first embodiment. [Figure 9] FIG. 10 is a sequence diagram showing the flow of a transmission main signal insertion process performed by an inserter. [Figure 10] FIG. 4 is a sequence diagram showing the flow of a transmission main signal construction process executed by a first modulation device. [Figure 11] 10 is a diagram showing the structure of data in which transmission parameter information is added to a transmission main signal. FIG. [Figure 12]FIG. 10 is a functional block diagram of an inserter according to a second embodiment. [Figure 13] FIG. 10 is a sequence diagram for explaining the flow of a transmission main signal insertion process by an inserter according to the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0008] A transmission system and a transmission method according to the first embodiment will be described below with reference to the drawings. In the following embodiments, parts with the same reference numerals perform similar operations, and redundant explanations will be omitted as appropriate. The following embodiments do not limit the disclosed technology. Each embodiment can be combined as appropriate within the scope of not causing contradictions in the processing content.

[0009] [First embodiment] 1 is a configuration diagram for explaining an outline of a transmission system S according to the first embodiment. The transmission system S according to the first embodiment inserts a 4K broadcast signal into a broadcast TS for 2K broadcasting while maintaining compatibility, transmits the signal, and constructs a 4K broadcast signal from the transmitted broadcast TS for 2K broadcasting.

[0010] As shown in Figure 1, the transmission system S includes a 2K broadcast encoder 10, a first multiplexing device 12, a first remultiplexing device 14, a 4K broadcast encoder 20, a second multiplexing device 22, a second remultiplexing device 24, an inserter 30, a first relay device 40, a first modulation device 50, a second relay device 60, and a second modulation device 70.

[0011] The configuration of the transmission system S according to the first embodiment is not limited to the example shown in Fig. 1. For example, the inserter 30, the first modulation device 50, and the second modulation device 70 may each include some of the functions of other devices.

[0012] The 2K broadcast encoder 10 encodes the input video data and audio data for 2K broadcasting, converts the data into a TS (Transport Stream) which is a bit stream, and sends it to the first multiplexer 12.

[0013] The first multiplexer 12 multiplexes the video and audio TSs received from the 2K broadcast encoder 10 into one TS and sends it to the first remultiplexer 14 .

[0014] The first re-multiplexing device 14 re-multiplexes the multiplexed TSs received from the first multiplexing device 12 into one TS to separate them into predetermined layers and transmit them, thereby generating a broadcast TS. The first re-multiplexing device 14 sends the generated broadcast TS to the inserter 30. The broadcast TS sent by the first re-multiplexing device 14 to the inserter 30 is an example of a first broadcast TS.

[0015] Fig. 2 is a diagram for explaining the data structure of a TS packet used in a broadcast TS. As shown in Fig. 2, a TS packet used in a broadcast TS has a structure in which additional information (8 bytes) and parity (8 bytes) are multiplexed on an information portion serving as actual data of 188 bytes.

[0016] Figure 3 is a diagram showing the configuration of the information portion as actual data of the TS packet shown in Figure 2. As shown in Figure 3, the information portion of the TS packet has a header portion and an adaptation field / payload portion. The header portion is divided into the following areas: synchronization byte (8 bits), transport error indicator (1 bit), payload unit start indicator (1 bit), transport priority (1 bit), PID (13 bits), transport scrambling control (2 bits), adaptation field control (2 bits), and continuity indicator (4 bits).

[0017] The 4K broadcast encoder 20 encodes the input video data and audio data for 4K broadcasting, divides the data into small units, and inserts them into the payload area of ​​MMTP (MPEG Media Transport Protocol) packets to generate MMTP packets corresponding to the video data and audio data. The 4K broadcast encoder 20 transmits the generated MMTP packets to the second multiplexer 22.

[0018] The second multiplexer 22 generates a TLV (Type Length Value) packet by multiplexing the MMTP of video and audio received from the 4K broadcast encoder 20. The second multiplexer 22 sends the generated TLV packet to the second re-multiplexer 24.

[0019] The second re-multiplexing device 24 re-multiplexes the TLV packets received from the second multiplexing device 22 to generate a transmission main signal. The second re-multiplexing device 24 sends the generated transmission main signal to the inserter 30. Note that the transmission main signal sent by the second re-multiplexing device 24 to the inserter 30 is an example of a first transmission main signal.

[0020] Fig. 4 is a diagram for explaining the data structure of the transmission main signal used in 4K broadcasting. As shown in Fig. 4, the transmission main signal has a multiplexed frame structure based on TMCC (Transmission and Multiplexing Configuration Control) information, and is a stream consisting of 5610-byte slot groups. Here, TMCC information is information related to transmission control, such as the allocation of transmission streams to each slot and the relationship with the transmission method.

[0021] Fig. 5 shows an example of a signal block as a 4K broadcast signal having the same basic structure as the main transmission signal. As shown in Fig. 5, the signal block is a stream consisting of a group of slots of 8640 bytes (69120 bits). The signal block has a structure in which data from a block header area, a main signal area (actual data area), a BCH parity area, an LDPC parity area, and a stuff bit area (not shown) are multiplexed.

[0022] The data in the BCH parity area, stuff bit area, and LDPC parity area shown in FIGS. 4 and 5 is also called redundant data in relaying the main transmission signal.

[0023] In the following, for the sake of concreteness, an example will be taken in which the transmission main signal used in 4K broadcasting has a signal block configuration with the multiplexing structure shown in FIG. Any signal block having the same basic structure as the transmission main signal shown in FIG. 4 can be used in the transmission system, transmission method, etc. according to this embodiment.

[0024] The inserter 30 divides a first transmission main signal to generate a plurality of second transmission main signals, inserts (multiplexes) the second transmission main signals and configuration information of the first transmission main signal into a first broadcast TS, and transmits the second broadcast TS. That is, the inserter 30 inserts a 4K broadcast signal into a broadcast TS for 2K broadcasting while maintaining compatibility. The configuration of this inserter 30 will be described in detail later.

[0025] The first relay device 40 and the second relay device 60 receive the broadcast TS from the inserter 30 and transmit it to the first modulation device 50 and the second modulation device 70, respectively.

[0026] The first modulation device 50 and the second modulation device 70 receive the second broadcast TS, extract multiple second transmission main signals from the second broadcast TS, and construct the first transmission main signal using the configuration information and the multiple second transmission main signals. That is, a 4K broadcast signal is constructed from the transmitted broadcast TS for 2K broadcasting while maintaining compatibility. The configurations of the first modulation device 50 and the second modulation device 70 will be described in detail later. The first modulation device 50 and the second modulation device 70 are examples of data construction devices.

[0027] 6 is a functional block diagram of the inserter 30 according to the first embodiment. The inserter 30 according to the first embodiment divides a first transmission main signal to generate a plurality of second transmission main signals, multiplexes the second transmission main signals and configuration information of the first transmission main signal into a first broadcast TS (Transport Stream), and transmits the second broadcast TS.

[0028] 6, the inserter 30 includes a first broadcast TS receiving unit 301, a transmission main signal receiving unit 302, an external control unit 303, a transmission parameter generating unit 304, a redundant data deleting unit 305, a dividing unit 306, a divided data inserting unit 307, a transmission parameter inserting unit 308, and a broadcast TS transmitting unit 309. Note that the dividing unit 306 is an example of a dividing unit, and the divided data inserting unit 307 and the transmission parameter inserting unit 308 are examples of a generating unit.

[0029] The first broadcast TS receiver 301 receives a broadcast TS from an upstream remultiplexer (not shown) for 2K broadcasting. The broadcast TS is a stream made up of a group of 204-byte TS packets, in which 8 bytes of additional information (ISDB-T_information) and 8 bytes of parity are multiplexed into a 188-byte actual data area.

[0030] The transmission main signal receiving unit 302 receives a transmission main signal from an upstream remultiplexing device (not shown) for 4K broadcasting. Here, the transmission main signal is a stream made up of a group of signal blocks, each of which has a block header area, a main signal area, a BCH parity area, an LDPC parity area, and a stuff bit area.

[0031] The external control unit 303 receives a control signal for generating transmission parameter information of a transmission main signal from an external device (not shown).

[0032] The transmission parameter generating unit 304 generates transmission parameter information of the transmission main signal in response to the external control unit 303 receiving a control signal. Here, the transmission parameter information is information including at least one of carrier modulation information, constellation identification information, error correction code length information, and error correction coding rate information. The transmission parameter information is an example of configuration information.

[0033] The redundant data deletion unit 305 deletes redundant data contained in the transmission main signal based on the transmission parameter information received from the transmission parameter generation unit 304 .

[0034] The division unit 306 divides the signal block (i.e., the transmission main signal) from which redundant data has been deleted into units of the data amount (184 bytes) of the TS payload. Note that the transmission main signal divided by the division unit 306 is an example of a second transmission main signal.

[0035] Fig. 7 is a diagram illustrating the division process performed by division section 306 and the insertion process performed by divided data insertion section 307. The upper part of Fig. 7 shows a signal block 80 from which redundant data has been deleted. Signal block 80 from which redundant data has been deleted is data made up of a header area 800 and a main signal area 801.

[0036] As shown in the middle of Fig. 7, the division unit 306 divides the header area 800 and the main signal area 801 into 184-byte segments to generate a plurality of divided data 81, 82, 83, and 84. When dividing into 184-byte segments, some data (less than 184 bytes) is left over from the division. The division unit 306 concatenates stuffing bytes (0xFF) to this data to generate 184-byte data. The divided data 84 in Fig. 7 represents 184-byte data obtained by concatenating stuffing byte data 841 to data 840 remaining after division.

[0037] In addition, the division unit 306 may concatenate the remaining data 84 resulting from division with the signal block 80 (i.e., the header area 800, the main signal area 801) from which the next (subsequent) redundant data has been deleted, and perform the division process every 184 bytes.

[0038] As shown in the lower part of Figure 7, the fragmented data insertion unit 307 overwrites the multiple fragmented data (each 184 bytes of data) received from the fragmentation unit 306 into the TS payload (184 bytes) area of ​​the invalid layer TS packet of the broadcast TS received from the first broadcast TS receiving unit 301, thereby inserting (multiplexing) the fragmented data into the broadcast TS.

[0039] Specifically, the segment data insertion unit 307 rewrites the layer_indicator in the additional information (ISDB-T_information) area of ​​the invalid layer TS packet that overwrites the segment data to one of 0x9 to 0xF, or rewrites the PID in the TS header area of ​​the invalid layer TS packet that overwrites the segment data to one of the values ​​not defined in the operator operating regulations.

[0040] Furthermore, if the segmented data includes a signal block header, the segmented data inserting unit 307 rewrites the payload unit start indicator in the TS header area of ​​the invalid layer TS packet to be overwritten to "1".

[0041] Invalid layer TS packets of a broadcast TS can be identified by PID=0x1FFF in the TS header or layer_indicator=0x0 in ISDB-T_information. Invalid layer TS packets of a broadcast TS can also be identified by the combination of parameters in TMCC_information of modulation_control_configuration_information of the IIP transmitted in the broadcast TS.

[0042] The transmission parameter insertion unit 308 overwrites the transmission parameter information from the transmission parameter generation unit 304 into the AC data area of ​​the broadcast TS (into which the divided data has been inserted) from the divided data insertion unit 307, thereby inserting (multiplexing) the transmission parameter information into the broadcast TS. Here, the AC data area is the AC_data area in the additional information (ISDB-T_information) of the TS packet of the broadcast TS.

[0043] The transmission parameter insertion unit 308 can also insert (multiplex) the transmission parameter information into the broadcast TS by overwriting the transmission parameter information from the transmission parameter generation unit 304 into the TS payload (184 byte) area of ​​an invalid layer TS packet other than the invalid layer TS packet into which the divided data of the broadcast TS has been inserted. When overwriting the TS payload (184 byte) area of ​​an invalid layer TS packet in this way, the PID in the TS header area of ​​the invalid layer TS packet to be overwritten is rewritten to one of values ​​not defined in the operator operation regulations. When overwriting the TS payload (184 byte) area of ​​an invalid layer TS packet, the layer_indicator in the additional information (ISDB-T_information) area of ​​the invalid layer TS packet to be overwritten may also be rewritten to one of 0x9 to 0xF.

[0044] The broadcast TS transmitting unit 309 transmits the broadcast TS received from the transmission parameter inserting unit 308 (in which the transmission parameter information has been inserted) to the first relay device 40.

[0045] 8 is a functional block diagram of a first modulation device 50 according to the first embodiment. The first modulation device 50 receives the second broadcast TS, extracts the second main transmission signals from the second TS, and constructs the first main transmission signal using the configuration information and the second main transmission signals. Note that the configuration of the second modulation device 70 is substantially the same as that of the first modulation device 50, and therefore details thereof will be omitted.

[0046] 8, the first modulation device 50 includes a second broadcast TS receiving unit 501, a transmission parameter extracting unit 502, a divided data extracting unit 503, a concatenating unit 504, a redundant data restoring unit 505, a main transmission signal constructing unit 506, a transmission path coding unit 507, and a modulation processing unit 508. The transmission parameter extracting unit 502 and the divided data extracting unit 503 are examples of an extracting unit, and the redundant data restoring unit 505 and the main transmission signal constructing unit 506 are examples of a constructing unit.

[0047] The second broadcast TS receiving unit 501 receives a broadcast TS from an upstream relay device.

[0048] The transmission parameter extraction unit 502 extracts transmission parameter information of the transmission main signal from the AC data area of ​​the received broadcast TS. The transmission parameter extraction unit 502 also extracts transmission parameter information of the transmission main signal from the TS payload (184 bytes) area of ​​the invalid layer TS packet of the received broadcast TS. Note that invalid layer TS packets that store transmission parameter information can be identified by whether the PID in the TS header is a value not defined in the operator's operating regulations, or whether the layer_indicator in the additional information (ISDB-T_information) area is any of 0x9 to 0xF.

[0049] The divided data extraction unit 503 extracts (copies or cuts) divided data from the TS payload (184 bytes) area of ​​the invalid layer TS packet of the received broadcast TS. When cutting out divided data, the divided data extraction unit 503 stuffs 0xFF into the TS payload (184 bytes) area. Note that invalid layer TS packets that store divided data can be identified by whether the layer_indicator in the additional information (ISDB-T_information) area is any of 0x9 to 0xF, or whether the PID in the TS header is a value not defined in the operator's operational regulations. Also, invalid layer TS packets that store divided data including a signal block header can be identified by the payload unit start indicator in the TS header area.

[0050] The concatenation unit 504 concatenates the divided data based on the transmission parameter information to construct a signal block from which redundant data has been deleted. As described above, the signal block from which redundant data has been deleted is data consisting of a signal block header and a main signal. The data size of the main signal area is uniquely determined by the transmission parameter information. Note that if a stuffing byte (0xFF) exists in the divided data, the concatenation unit 504 deletes the stuffing byte.

[0051] The redundant data restoration unit 505 restores the signal block by concatenating the redundant data to the signal block from which the redundant data has been deleted, based on the transmission parameter information. Note that the concatenation of the redundant data can be performed by concatenating stuffing bytes corresponding to the sizes of the BCH parity area, stuff bit area, and LDPC parity area. Furthermore, the data size of the LDPC parity area is uniquely determined by the transmission parameter information.

[0052] The transmission main signal constructing unit 506 constructs a transmission main signal from the restored signal blocks.

[0053] The transmission path coding unit 507 performs transmission path coding on the constructed transmission main signal.

[0054] The modulation processing unit 508 modulates the line-coded main transmission signal and transmits it as a modulated transmission wave.

[0055] Next, the transmission main signal insertion process executed by the inserter 30 will be described.

[0056] 9 is a sequence diagram showing the flow of the transmission main signal insertion process executed by the inserter 30. The operation of the inserter 30 will be described below with reference to FIG.

[0057] The first broadcast TS receiving unit 301 receives a broadcast TS from a remultiplexing device for 2K broadcasting (step S1).

[0058] The transmission main signal receiving unit 302 receives the transmission main signal from the remultiplexing device for 4K broadcasting (step S2). The transmission main signal receiving unit 302 sends the received transmission main signal to the redundant data deleting unit 305.

[0059] The external control unit 303 receives a control signal for generating transmission parameter information of the transmission main signal from an external device (step S3).

[0060] In response to the external control unit 303 receiving the control signal, the transmission parameter generating unit 304 generates transmission parameter information of the transmission main signal (step S4).

[0061] The redundant data deletion unit 305 deletes the redundant data contained in the signal block based on the transmission parameter information received from the transmission parameter generation unit 304 (step S5). That is, the redundant data deletion unit 305 deletes each piece of data from the BCH parity area, the LDPC parity area, and the stuff bit area. Note that the data size of the LDPC parity area is uniquely determined by the transmission parameter information. The redundant data deletion unit 305 sends the signal block from which the redundant data has been deleted to the division unit 306.

[0062] The dividing unit 306 divides the signal block from which the redundant data has been deleted in units of the data amount (184 bytes) of the TS payload to generate a plurality of divided data pieces (184 bytes) (step S6). The dividing unit 306 sends the plurality of divided data pieces to the divided data inserting unit 307.

[0063] The divided data insertion unit 307 overwrites the multiple divided data (184 bytes each) received from the division unit 306 into the TS payload (184 bytes) area of ​​the invalid layer TS packet of the broadcast TS received from the first broadcast TS reception unit 301, thereby inserting (multiplexing) the divided data into the broadcast TS (step S7). The divided data insertion unit 307 sends the broadcast TS with the divided data inserted to the transmission parameter insertion unit 308.

[0064] The transmission parameter insertion unit 308 overwrites the transmission parameter information in the AC data area of ​​the broadcast TS received from the divided data insertion unit 307 (into which the divided data has been inserted) and inserts (multiplexes) the transmission parameter information into the broadcast TS (step S8). The transmission parameter insertion unit 308 sends the broadcast TS into which the transmission parameter information has been inserted to the broadcast TS transmission unit 309.

[0065] The broadcast TS transmitting unit 309 transmits the broadcast TS received from the transmission parameter inserting unit 308 (in which the transmission parameter information has been inserted) to the first relay device 40 (step 9).

[0066] Next, the transmission main signal construction process executed by the first modulation device 50 will be described.

[0067] 10 is a sequence diagram showing the flow of the transmission main signal construction process executed by the first modulation device 50. The operation of the first modulation device 50 will be described below with reference to FIG.

[0068] The second broadcast TS receiving unit 501 receives a broadcast TS from an upstream relay device (step S11). The second broadcast TS receiving unit 501 sends the received broadcast TS to the transmission parameter extracting unit 502.

[0069] The transmission parameter extraction unit 502 extracts (reads) transmission parameter information of the transmission main signal from the AC data area of ​​the broadcast TS received from the second broadcast TS receiving unit 501. The transmission parameter extraction unit 502 also extracts transmission parameter information of the transmission main signal from the TS payload (184 bytes) area of ​​the invalid layer TS packet of the received broadcast TS (step S12). The transmission parameter extraction unit 502 sends the extracted transmission parameter information to the concatenation unit 504 and the redundant data restoration unit 505.

[0070] The divided data extraction unit 503 extracts (copies or cuts) divided data from the TS payload (184 bytes) area of ​​the invalid layer TS packet of the received broadcast TS (step S13). The divided data extraction unit 503 sends the extracted divided data to the concatenation unit 504.

[0071] The concatenation unit 504 concatenates the divided data based on the transmission parameter information to construct a signal block from which redundant data has been deleted (step S14). Note that if any stuffing bytes (0xFF) exist in the divided data, the concatenation unit 504 deletes the stuffing bytes. The concatenation unit 504 sends the signal block from which redundant data has been deleted to the redundant data restoration unit 505.

[0072] The redundant data restoration unit 505 restores the signal block by concatenating the redundant data to the signal block from which the redundant data has been deleted based on the transmission parameter information (step S15). The redundant data restoration unit 505 sends the restored signal block to the transmission main signal construction unit 506.

[0073] The transmission main signal constructing unit 506 constructs a transmission main signal from the restored signal blocks (step S16). The transmission main signal constructing unit 506 sends the constructed transmission main signal to the transmission path coding unit 507.

[0074] The line coding unit 507 performs line coding on the constructed main transmission signal (step S17). The line coding unit 507 sends the line-coded main transmission signal to the modulation processing unit 508.

[0075] The modulation processing unit 508 modulates the line-coded transmission main signal and transmits it as a modulated transmission wave (step S18).

[0076] According to the transmission system of the embodiment described above, the inserter 30 divides and inserts (multiplexes) the main transmission signal for 4K broadcasting into the broadcast TS for 2K broadcasting. The first modulation device 50 extracts the divided main transmission signal for 4K broadcasting from the broadcast TS and constructs the main transmission signal for 4K broadcasting. Therefore, it is possible to realize an advanced terrestrial digital television broadcasting (4K broadcasting) while maintaining compatibility with the current broadcast TS, without affecting existing STL / TTL line facilities, and without introducing new line facilities.

[0077] The inserter 30 also removes redundant data from the transmission main signal for 4K broadcasting and inserts the divided transmission main signal into the broadcast TS for 2K broadcasting. The first modulation device 50 extracts the divided transmission main signal for 4K broadcasting from the broadcast TS, restores the redundant data, and constructs the transmission main signal for 4K broadcasting. Therefore, it is possible to transmit a 4K broadcast signal from which redundant data has been removed. As a result, data transmission can be made more efficient, and the burden on the video and audio encoding of the 4K master facility and the decoding processing of the receiver can be reduced.

[0078] [Second embodiment] Next, a transmission system and a transmission method according to a second embodiment will be described. In the first embodiment, an example was shown in which a control signal for generating transmission parameter information of a transmission main signal is received from an external control device. In contrast, the transmission system and transmission method according to the second embodiment receive transmission parameter information together with the transmission main signal from the second remultiplexing device 24 for 4K broadcasting shown in FIG.

[0079] Fig. 11 is a diagram for explaining the remultiplexing process in the second remultiplexing device 24 for 4K broadcasting shown in Fig. 1, and shows the structure of data in which transmission parameter information is added to the transmission main signal. As shown in Fig. 11, the data in which transmission parameter information is added to the transmission main signal has a structure in which a slot area (5610 bytes) is combined with a TMCC basic information area (35 bytes). The TMCC basic information area contains transmission parameter information such as the modulation method and coding rate.

[0080] In the transmission system and transmission method according to the second embodiment, the second remultiplexer 24 multiplexes transmission parameter information into the TMCC basic information area shown in FIG. 11 and sends it to the inserter 30 together with the transmission main signal.

[0081] Fig. 12 is a functional block diagram of an inserter 30 according to the second embodiment. Compared with the inserter 30 according to the first embodiment shown in Fig. 6, the inserter 30 according to the second embodiment differs in that it does not have an external control unit 303 and newly includes a transmission parameter extraction unit 310.

[0082] The transmission parameter extraction unit 310 extracts transmission parameter information from the TMCC basic information area received by the transmission main signal receiving unit 302 from the second remultiplexer 24 .

[0083] 13 is a sequence diagram for explaining the flow of the transmission main signal insertion process of the inserter 30 according to the second embodiment. Only steps that differ from the process shown in FIG. 9 will be explained below.

[0084] The processes in steps S21 and S22 are substantially the same as the processes in steps S1 and S2 in FIG.

[0085] The transmission parameter extraction unit 310 extracts transmission parameter information from the TMCC basic information area received by the transmission main signal receiving unit 302.

[0086] The subsequent steps S25 to S29 are substantially the same as the steps S5 to S9 in FIG.

[0087] The transmission system S and transmission method according to the second embodiment described above can also achieve the same effects as those of the first embodiment.

[0088] (Variation) In the above-described embodiments, the transmission system S has been exemplified in which the first modulating device 50 and the second modulating device 70 are data construction devices. However, the transmission system S may be configured, for example, such that the functions of the first modulating device 50 and the second modulating device 70 as data construction devices are separate entities. That is, the first modulating device 50 and the second modulating device 70 may be configured to include a transmission path coding unit 507 and a modulation processing unit 508, and a data construction device including a transmission parameter extraction unit 502, a divided data extraction unit 503, a concatenation unit 504, a redundant data recovery unit 505, and a transmission main signal construction unit 506 may be arranged in front of each of the first modulating device 50 and the second modulating device 70.

[0089] The transmission method described in each of the above embodiments can also be realized by a program executable by a computer. That is, a program that realizes the transmission method described in each of the above embodiments can be stored in a memory, and the program can be read from the memory by a processing circuit of a computer, and the software and hardware resources can work together to construct the transmission system or transmission method described in each of the above embodiments.

[0090] (Addendum) The above description of the embodiments discloses the following techniques. (1) an inserter that divides a first transmission main signal to generate a plurality of second transmission main signals, multiplexes the second transmission main signals and configuration information of the first transmission main signal into a first broadcast TS (Transport Stream), and transmits the second broadcast TS; a construction device that receives the second broadcast TS, extracts the plurality of second transmission main signals and the configuration information from the second broadcast TS, and constructs the first transmission main signal using the configuration information and the plurality of second transmission main signals; A transmission system comprising: (2) the first transmission main signal includes first data corresponding to actual data and second data different from the first data; the inserter deletes the second data from the first transmission main signal, and then divides the first transmission main signal from which the second data has been deleted to generate the plurality of second transmission main signals. The transmission system according to (1). (3) the construction device supplements the first transmission main signal from which the second data has been deleted with the second data based on the configuration information, thereby constructing the first transmission main signal. (2) A transmission system according to (2). (4) the inserter divides the first transmission main signal using a data amount of a TS payload as a division unit to generate the plurality of second transmission main signals. A transmission system according to (2) or (3). (5) The second data includes at least one of a BCH parity area, a stuff bit area, and an LDPC parity area in the first transmission main signal. A transmission system according to any one of (2) to (4). (6) When the first transmission main signal is not divisible by the division unit, the inserter concatenates and divides two or more of the first transmission main signals. (5) A transmission system according to (5). (7) When the first transmission main signal is not divisible by the division unit, the inserter divides the first transmission main signal by concatenating stuffing bytes (0xFF) to the first transmission main signal. (5) A transmission system according to (5). (8) the inserter, in the multiplexing of the first broadcast TS, overwrites the second transmission main signal in a TS payload area of ​​an invalid layer TS packet of the first broadcast TS, and rewrites a layer_indicator in an 8-byte area following the TS payload area to any one of 0x9 to 0xF. A transmission system according to (6) or (7). (9) In the multiplexing of the first broadcast TS, the inserter overwrites the second transmission main signal in the TS payload area of ​​the invalid layer TS packet of the first broadcast TS, and rewrites the PID in the TS header area to any value not defined in the carrier operation regulations. A transmission system according to any one of (6) to (8). (10) the inserter, in the multiplexing of the first broadcast TS, overwrites the second transmission main signal in the TS payload area of ​​an invalid layer TS packet of the first broadcast TS, and rewrites a predetermined bit in the TS header area or additional information area of ​​the invalid layer TS packet including the header area in the first transmission main signal; A transmission system according to (8) or (9). (11) the configuration information includes transmission parameter information of the first transmission main signal; A transmission system according to any one of (1) to (10). (12) the transmission parameter information includes at least one of carrier modulation information, constellation identification information, error correction code length information, and error correction coding rate information; (11) A transmission system according to (11). (13) The inserter overwrites the configuration information into an AC data area in ISDB-T_information of a TS packet when multiplexing the configuration information into the first broadcast TS. (12) A transmission system according to (12). (14) When multiplexing the configuration information into the first broadcast TS, the inserter overwrites the configuration information in the TS payload area of ​​an invalid layer TS packet of the first broadcast TS, and rewrites the PID in the TS header area to any value not defined in the carrier operation regulations. (12) A transmission system according to (12). (15) When multiplexing the configuration information into the first broadcast TS, the inserter overwrites the configuration information in the TS payload area of ​​the invalid layer TS packet of the first broadcast TS, and rewrites the layer_indicator in the 8-byte area (ISDB-T_information) following the TS payload area to any one of 0x9 to 0xF. A transmission system according to (12) or (14). (16) the construction device generates duplicated data or extracted data based on data stored in a TS payload area of ​​an invalid layer TS packet of the second broadcast TS in extracting the second transmission main signal. A transmission system according to any one of (1) to (15). (17) The construction device deletes stuffing bytes (0xFF) from the replicated data or the extracted data. (16) A transmission system according to (16). (18) the construction device, in extracting the second transmission main signal, identifies the second transmission main signal based on a layer_indicator in ISDB-T_information; A transmission system according to (16) or (17). (19) the construction device, in extracting the second transmission main signal, identifies the second transmission main signal by a PID in a TS header area; A transmission system according to (16) or (17). (20) the construction device constructs the first transmission main signal by concatenating the duplicated data or the extracted data. A transmission system according to any one of (16) to (19). (twenty one) The construction device comprises: In constructing the first main transmission signal, the first main transmission signal is constructed by concatenating at least one of a BCH parity area, a stuff bit area, and an LDPC parity area; In the construction of the first transmission main signal, a header area in the first transmission main signal is identified by a predetermined bit in a TS header area or an additional information area of ​​an invalid layer TS packet. (20) A transmission system according to (20). (twenty two) the construction device, in constructing the first main transmission signal, identifies a data amount of first data corresponding to actual data and a data amount of second data different from the first data by referring to the configuration information. A transmission system according to (20) or (21). (twenty three) the construction device reads the data of the configuration information from an AC data area in ISDB-T_information of a TS packet in constructing the first transmission main signal; (22) A transmission system according to (22). (twenty four) In constructing the first transmission main signal, the construction device reads the data of the configuration information from the TS payload area of ​​an invalid layer TS packet in which the layer_indicator in ISDB-T_information is 0x0 or any one of 0x9 to 0xF, or the PID in the TS header area is any value not defined in the carrier operation regulations. (22) A transmission system according to (22). (twenty five) Dividing the first transmission main signal to generate a plurality of second transmission main signals; multiplexing the second transmission main signal and configuration information of the first transmission main signal into a first broadcast TS (Transport Stream) and transmitting the second broadcast TS; receiving the second broadcast TS; extracting the plurality of second transmission main signals from the second broadcast TS; constructing the first transmission main signal using the configuration information and the plurality of second transmission main signals; A transmission method comprising: (26) a division unit that divides a first transmission main signal to generate a plurality of second transmission main signals; a generating unit that multiplexes the second transmission main signal and configuration information of the first transmission main signal into a first broadcast TS (Transport Stream) to generate a second broadcast TS; Inserter with. (27) a receiving unit that receives a second broadcast transport stream (TS) that is generated by multiplexing a plurality of second main transmission signals generated by dividing a first main transmission signal and configuration information of the first main transmission signal into a first broadcast transport stream; an extractor that extracts the plurality of second transmission main signals and the configuration information from the second broadcast TS; a constructing unit that constructs the first transmission main signal using the configuration information and the plurality of second transmission main signals; A data construction device comprising:

[0091] Although several embodiments (and variations) of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be embodied in various other forms, and various omissions, substitutions, modifications, and combinations can be made without departing from the spirit of the invention. These embodiments and variations thereof are included within the scope and spirit of the invention, and are also included in the inventions and their equivalents as defined in the claims. [Explanation of symbols]

[0092] 10 2K Broadcast Encoder 12 First multiplexer 14 1st remultiplexer 20 4K Broadcast Encoder 22 Second multiplexer 24 Second remultiplexer 30 Inserter 40 First relay device 50 First Modulation Device 60 Second relay device 70 Second Modulation Device 301 1st Broadcast TS Receiving Unit 302 Transmission main signal receiving unit 303 External control unit 304 Transmission parameter generation unit 305 Redundant data deletion unit 306 Split section 307 Split data insertion part 308 Transmission parameter insertion section 309 Broadcast TS Transmission Unit 310 Transmission parameter extraction unit 501 Second broadcast TS receiving unit 502 Transmission parameter extraction unit 503 Split Data Extraction Unit 504 Connection part 505 Redundant Data Recovery Unit 506 Transmission Main Signal Construction Unit 507 Transmission Line Coding Unit 508 Modulation processing section S Transmission System

Claims

1. an inserter that divides a first transmission main signal to generate a plurality of second transmission main signals and transmits a second broadcast TS from the second transmission main signals and configuration information of the first transmission main signal; a construction device that receives the second broadcast TS, extracts the plurality of second transmission main signals and the configuration information from the second broadcast TS, and constructs the first transmission main signal using the configuration information and the plurality of second transmission main signals; A transmission system comprising:

2. the first transmission main signal includes first data corresponding to actual data and second data different from the first data; the inserter deletes the second data from the first transmission main signal, and then divides the first transmission main signal from which the second data has been deleted to generate the plurality of second transmission main signals. The transmission system according to claim 1 .

3. the construction device supplements the first transmission main signal from which the second data has been deleted with the second data based on the configuration information, thereby constructing the first transmission main signal.

3. The transmission system according to claim 2.

4. the inserter divides the first transmission main signal using a data amount of a TS payload as a division unit to generate the plurality of second transmission main signals.

4. A transmission system according to claim 2 or 3.

5. the second data includes at least one of a BCH parity area, a stuff bit area, and an LDPC parity area in the first transmission main signal; A transmission system according to any one of claims 2 to 4.

6. When the first transmission main signal is not divisible by the division unit, the inserter concatenates and divides two or more of the first transmission main signals.

6. The transmission system according to claim 5.

7. When the first transmission main signal is not divisible by the division unit, the inserter divides the first transmission main signal by concatenating stuffing bytes (0xFF) to the first transmission main signal.

6. The transmission system according to claim 5.

8. the configuration information includes transmission parameter information of the first transmission main signal; A transmission system according to any one of claims 1 to 7.

9. the transmission parameter information includes at least one of carrier modulation information, constellation identification information, error correction code length information, and error correction coding rate information; The transmission system according to claim 8.

10. the construction device generates duplicated data or extracted data based on data stored in a TS payload area of ​​an invalid layer TS packet of the second broadcast TS in extracting the second transmission main signal. A transmission system according to any one of claims 1 to 9.

11. The construction device deletes stuffing bytes (0xFF) from the replicated data or the extracted data. The transmission system according to claim 10.

12. the construction device, in extracting the second transmission main signal, identifies the second transmission main signal based on a layer_indicator in ISDB-T_information; 12. A transmission system according to claim 10 or 11.

13. the construction device, in extracting the second transmission main signal, identifies the second transmission main signal by a PID in a TS header area; 12. A transmission system according to claim 10 or 11.

14. the construction device constructs the first transmission main signal by concatenating the duplicated data or the extracted data. A transmission system according to any one of claims 10 to 13.

15. The construction device includes: In constructing the first transmission main signal, the first transmission main signal is constructed by concatenating at least one of a BCH parity area, a stuff bit area, and an LDPC parity area; In the construction of the first transmission main signal, a header area in the first transmission main signal is identified by a predetermined bit in a TS header area or an additional information area of ​​an invalid layer TS packet.

15. The transmission system according to claim 14.

16. the construction device, in constructing the first main transmission signal, identifies a data amount of first data corresponding to actual data and a data amount of second data different from the first data by referring to the configuration information.

16. A transmission system according to claim 14 or 15.

17. the construction device reads data of the configuration information from an AC data area in ISDB-T_information of a TS packet in constructing the first transmission main signal; 17. The transmission system according to claim 16.

18. In constructing the first main transmission signal, the construction device reads the data of the configuration information from the TS payload area of ​​an invalid layer TS packet in which the layer_indicator in ISDB-T_information is 0x0 or any one of 0x9 to 0xF, or the PID in the TS header area is a value not defined in the carrier operation regulations.

17. The transmission system according to claim 16.

19. Dividing the first transmission main signal to generate a plurality of second transmission main signals; Transmitting a second broadcast TS from the second transmission main signal and configuration information of the first transmission main signal; receiving the second broadcast TS; extracting the plurality of second transmission main signals from the second broadcast TS; constructing the first transmission main signal using the configuration information and the plurality of second transmission main signals; A transmission method comprising:

20. a division unit that divides a first transmission main signal to generate a plurality of second transmission main signals; a generating unit that generates a second broadcast TS from the second transmission main signal and configuration information of the first transmission main signal; Inserter with.

21. a receiving unit that receives a second broadcast TS generated from a plurality of second main transmission signals generated by dividing a first main transmission signal and configuration information of the first main transmission signal; an extractor that extracts the plurality of second transmission main signals and the configuration information from the second broadcast TS; a constructing unit that constructs the first transmission main signal using the configuration information and the plurality of second transmission main signals; A data construction device comprising:

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