Transmitting device, receiving device, program, and transmitting method

Abstract

To facilitate the establishment of frame synchronization between channels.SOLUTION: A transmitting device includes first and second sub-frame generation units that generate first and second sub-frames based on first and second data signals, respectively, a first frame configuration unit that outputs the first or second sub-frame to a first physical channel, a second frame configuration unit that outputs the second sub-frame to a second physical channel, and an adjustment unit that adjusts the operation of the second sub-frame generation unit. The first frame configuration unit outputs an input signal to the first physical channel while switching a signal input destination between the first and second sub-frame generation units at a predetermined timing, and the second frame configuration unit outputs a signal based on the second sub-frame to the second physical channel, and the adjustment unit adjusts the operation of the second sub-frame generation unit so that the frame length of the signal output to the second physical channel is the same as the frame length of the signal output to the first physical channel.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a transmitting device, a receiving device, a program, and a transmitting method. [Background technology]

[0002] As a transmission method for next-generation terrestrial digital television broadcasting, an advanced terrestrial broadcasting method (hereinafter referred to as the "advanced method") is being developed (Non-Patent Documents 1 and 2). Channel bonding (CB) transmission is known as an optional function of the advanced method.

[0003] CB transmission is a transmission method that expands transmission capacity by using two or more physical channels. There are two types of CB transmission: a transformer layer division mode in which the data stream is divided before error correction coding, and a physical layer division mode in which the data stream is divided after error correction coding (Non-Patent Document 1). ATSC (Advanced Television Systems Committee) 3.0, the next-generation terrestrial broadcasting standard in the United States, specifies CB transmission as an optional function.

[0004] The advanced system can transmit multiple broadcasting services with different noise tolerance and bit rates in a hierarchical manner. As a hierarchical division method, the advanced system implements both Frequency Division Multiplexing (FDM), which divides the frequency band into segments, and Time Division Multiplexing (TDM), which divides the band into subframes in the time domain, just like current terrestrial digital broadcasting.

[0005] Patent Documents 1 and 2 describe CB transmission techniques in hierarchical transmission using frequency division multiplexing. [Prior art documents] [Non-patent literature]

[0006] [Non-Patent Document 1] Asakura et al., "A Study on Channel Bonding in Advanced Terrestrial Broadcasting Systems," ITE Technical Report Vol. 45, No. 24, pp. 912, Sep. 2021 [Non-patent document 2] Miyasaka, Okano, Takabayashi, Shibata, "Transmission Method Aiming for Advanced Terrestrial Broadcasting", IEICE Journal, vol.107 no.1 pp.48-54 Jan.2024 [Patent documents]

[0007] [Patent Document 1] Japanese Patent Publication No. 2022-019683 [Patent Document 2] Japanese Patent Application Publication No. 2023-143848 Summary of the Invention [Problem to be solved by the invention]

[0008] The advanced system makes it possible to simultaneously transmit multiple services, such as fixed reception services and mobile reception services, by multiplexing multiple layers. A mode with a large FFT (Fast Fourier Transform) size is suitable for fixed reception services, while a mode with a small FFT size is suitable for mobile reception services.

[0009] The length of an Orthogonal Frequency Division Multiplexing (OFDM) symbol varies depending on the FFT size and the guard interval (GI) ratio (Non-Patent Document 2). Therefore, when broadcasting services are transmitted over multiple channels based on CB transmission in hierarchical transmission using time division multiplexing, if the OFDM frame configuration differs for each channel, it becomes difficult to synchronize the frames between channels.

[0010] For example, consider a case in which a transmission / reception system transmits services for fixed reception and services for mobile reception using two channels, Pch (Primary Channel) and Sch (Secondary Channel), based on CB transmission in hierarchical transmission using time division multiplexing. The transmission / reception system transmits services for fixed reception using both Pch and Sch channels, thereby expanding the transmission capacity of the services for fixed reception. Services for mobile reception are transmitted using only a single channel (Pch) due to their reception format and circuit size.

[0011] Fig. 8 is a diagram showing an example of the configuration of an OFDM frame transmitted by such time division multiplexing. In Fig. 8, the horizontal axis represents time, and the vertical axis represents frequency (channel). In the example of Fig. 8, the Pch OFDM frame comprises, from the beginning, a frame synchronization signal, a control signal (TMCC: Transmission and Multiplexing Configuration Control), a subframe for a service for mobile reception, and a subframe for a service for fixed reception. The Sch OFDM frame comprises, from the beginning, a frame synchronization signal, TMCC, and a subframe for a service for fixed reception. In Fig. 8, the FFT size for the service for fixed reception is 32k, and the FFT size for the service for mobile reception is 8k.

[0012] Here, the subframes for mobile reception services and those for fixed reception services have different FFT sizes and GI ratios. This causes a discrepancy in the subframe lengths between Pch and Sch, making it difficult to synchronize them in time. Thus, when multiple OFDM frames with mixed FFT sizes and different frame configurations are transmitted using CB transmission based on time division multiplexing, it is difficult to synchronize the OFDM frames of each channel in time.

[0013] The object of the present disclosure is to facilitate frame synchronization between channels when transmitting broadcasting services based on CB transmission in hierarchical transmission using time division multiplexing, even if the OFDM frame configuration in each channel is different. [Means for solving the problem]

[0014] According to the present disclosure, a transmitting device includes: (1) A transmitting device capable of channel bonding transmission, which transmits video and audio data signals by combining multiple physical channels, a first subframe generator that generates a first subframe based on a first data signal and outputs the first subframe; a second subframe generator that generates a second subframe based on the second data signal and outputs the second subframe; a first frame configuration unit that outputs the first subframe or the second subframe to a first physical channel; a second frame constructor that outputs the second subframe to a second physical channel; an adjustment unit that adjusts the operation of the second subframe generation unit; Equipped with the first frame configuration unit outputs the input signal to the first physical channel while switching the input destination of the signal between the first subframe generation unit and the second subframe generation unit at a predetermined timing; the second frame configuration unit outputs a signal based on the second subframe to the second physical channel; The adjustment unit adjusts the operation of the second subframe generation unit so that the frame length of the signal output by the second frame configuration unit to the second physical channel is the same as the frame length of the signal output by the first frame configuration unit to the first physical channel.

[0015] (2) In the transmitting device of (1), the first frame configuration unit outputs a signal consisting of a plurality of layers including the first subframe and the second subframe to the first physical channel; The second frame configuration unit may output a signal consisting of a single layer of the second subframe to the second physical channel.

[0016] (3) In the transmitting device of (1) or (2), The adjustment unit may adjust the operation of the second subframe generation unit so that an FFT size and a GI ratio of the second subframe are the same as an FFT size and a GI ratio of the first subframe.

[0017] (4) In the transmitting device of (1) or (2), The adjustment unit may output symbols related to a future extension region from the second frame construction unit and adjust the operation of the second subframe generation unit so that the frame length of the signal based on the second subframe is the same as the frame length of the signal output to the first physical channel by the first frame construction unit.

[0018] (5) In any of the transmitting devices described in (1) to (4), a TMCC generating unit that generates TMCC information regarding the transmission of the data signal, including flag information indicating whether or not the channel bonding transmission is to be performed; The adjustment unit may determine whether or not to perform the channel bonding transmission based on the flag information included in the TMCC information, and adjust the operation of the second subframe generation unit when it is determined that the channel bonding transmission is to be performed.

[0019] (6) In the transmitting device of (5), the first frame configuration unit outputs the input signal to the first physical channel while switching the input destination of the signal at a predetermined timing between the TMCC generation unit, the first subframe generation unit, and the second subframe generation unit; The second frame configuration unit may output the input signal to the second physical channel while switching the input destination of the signal between the TMCC generation unit and the second subframe generation unit at a predetermined timing.

[0020] According to the present disclosure, a receiving device includes: (7) A receiving device for receiving a video and audio data signal transmitted by the transmitting device of (2), and a demodulation unit that combines the data signal of the second subframe included in the signal transmitted via the first physical channel with the data signal of the second subframe included in the signal transmitted via the second physical channel, and demodulates the data signal related to the second subframe.

[0021] According to the present disclosure, the program (8) A computer is operated as a transmitting device according to any one of (1) to (6) or a receiving device according to (7).

[0022] According to the present disclosure, a transmission method includes: (9) A transmission method of a transmitting device capable of channel bonding transmission in which video and audio data signals are transmitted by combining multiple physical channels, comprising: The transmitting device a first subframe generator that generates a first subframe based on a first data signal and outputs the first subframe; a second subframe generator that generates a second subframe based on the second data signal and outputs the second subframe; a first frame configuration unit that outputs the first subframe or the second subframe to a first physical channel; a second frame constructor that outputs the second subframe to a second physical channel; an adjustment unit that adjusts the operation of the second subframe generation unit; Equipped with the first frame configuration unit outputs the input signal to the first physical channel while switching the input destination of the signal between the first subframe generation unit and the second subframe generation unit at a predetermined timing; the second frame configuration unit outputs a signal based on the second subframe to the second physical channel; The adjustment unit includes a step of adjusting the operation of the second subframe generation unit so that the frame length of the signal output by the second frame configuration unit to the second physical channel is the same as the frame length of the signal output by the first frame configuration unit to the first physical channel. [Effects of the Invention]

[0023] According to one embodiment of the present disclosure, when transmitting broadcasting services based on CB transmission in hierarchical transmission using time division multiplexing, it becomes easy to synchronize frames between channels even if the OFDM frame configurations on each channel are different. [Brief explanation of the drawings]

[0024] [Figure 1] FIG. 1 is a diagram illustrating an example of the configuration of a transmission / reception system according to an embodiment. [Figure 2] FIG. 2 is a diagram illustrating an example of the configuration of the modulation device of FIG. [Figure 3] 3 is a diagram illustrating an example of the configuration of a subframe generation unit in FIG. 2. [Figure 4A] FIG. 1 is a diagram illustrating an example of the configuration of an OFDM frame transmitted by time division multiplexing. [Figure 4B] FIG. 1 is a diagram illustrating an example of the configuration of an OFDM frame transmitted by time division multiplexing. [Figure 5] 3 is a flowchart showing an example of the operation of the adjustment unit in FIG. 2; [Figure 6] FIG. 2 is a diagram illustrating an example of the configuration of the demodulation device of FIG. [Figure 7] FIG. 7 is a diagram illustrating an example of the configuration of a CB demodulation unit in FIG. 6. [Figure 8]FIG. 1 is a diagram illustrating an example of the configuration of an OFDM frame transmitted by time division multiplexing. DETAILED DESCRIPTION OF THE INVENTION

[0025] Hereinafter, an embodiment of the present disclosure will be described with reference to the drawings. In each drawing, parts having the same configuration or function are denoted by the same reference numerals. In the description of this embodiment, duplicated descriptions of the same parts may be omitted or simplified as appropriate.

[0026] FIG. 1 is a diagram illustrating an example of the configuration of a transmission / reception system 1 according to an embodiment. As described above, channel bonding transmission (CB transmission) has two modes: a transformer layer division mode and a physical layer division mode. FIG. 1 illustrates an example of the configuration of a transmission / reception system 1 in which CB transmission in the physical layer division mode is performed. In the current ISDB-T (Integrated Services Digital Broadcasting-Terrestrial), hierarchical transmission is performed in which data signals of multiple layers with different transmission tolerances and transmission capacities are simultaneously transmitted within the same channel. In addition, in the advanced system, consideration is being given to transmitting emergency earthquake alerts and the like on a channel (Lch) that transmits with lower latency than main line signals (video and audio data signals transmitted on each layer). Below, an example of hierarchical transmission in three layers (layers A, B, and C) and transmission on Lch will be described.

[0027] 1, the transmission / reception system 1 includes a remultiplexing device 10, a modulation device 20 as a transmission device according to this embodiment, two transmitters 30 (30p, 30s), two receivers 40 (40p, 40s), and a demodulation device 50 as a reception device according to this embodiment. In this embodiment, the transmission / reception system 1 includes two transmitters 30 and two receivers 40, but the number of transmitters 30 and receivers 40 may be three or more. In this embodiment, the transmission / reception system 1 transmits and receives data signals using CB transmission over two channels, Pch and Sch, but the number of CB transmission channels may be three or more.

[0028] The remultiplexing device 10 remultiplexes the data signals (video and audio data) of each layer of hierarchical transmission and the data signal of the left channel, etc., to form a remultiplexed frame, and outputs the remultiplexed frame to the modulation device 20. Specifically, the remultiplexing device 10 remultiplexes an A-layer XMI (eXtensible Modulation Interface) packet, a B-layer XMI packet, a C-layer XMI packet, a synchronization control XMI packet, etc. Here, an XMI packet is a format defined in such a way that the remultiplexed frame, which is output from the remultiplexing device 10 and is formed by remultiplexing the data signals (video and audio data) of each layer of hierarchical transmission and the data signal of the left channel, is packetized according to a predetermined rule, and multiple modulation devices 20 output the same OFDM waveform. The A-layer XMI packet is a packet in which the A-layer data signal is stored in a data unit area. The B-layer XMI packet is a packet in which the B-layer data signal is stored in a data unit area. The C-layer XMI packet is a packet in which the C-layer data signal is stored in a data unit area. The synchronization control XMI packet is a packet in which TMCC information, which is control information related to the transmission of the data signals of each layer, is stored in a data unit area. The TMCC information included in the synchronization control XMI packet may include a CB flag indicating whether CB transmission is to be performed. The CB flag may, for example, be a bit "1" indicating that CB transmission is to be performed, or a bit "0" indicating that CB transmission is not to be performed. An area for storing the left channel data signal is provided in the XMI packet of each layer. When the left channel data signal is input, the remultiplexing device 10 stores the input left channel data signal in an area for storing the left channel data signal, which is provided in the XMI packet of each layer. Note that the format of the signal remultiplexed by the remultiplexing device 10 is not limited to the XMI packet and may be any format.

[0029] The modulation device 20 performs predetermined processing such as error correction coding and carrier modulation on the output of the remultiplexing device 10 to construct an OFDM frame. The modulation device 20 performs IFFT (Inverse Fast Fourier Transform) processing and adds a GI to the constructed OFDM frame, and outputs the frame to transmitters 30p and 30s.

[0030] The transmitter 30p transmits the OFDM frame output from the modulation device 20 via Pch, which is a first physical channel. The transmitter 30s transmits the OFDM frame output from the modulation device 20 via Sch, which is a second physical channel. The transmitters 30p and 30s operate in synchronization with each other and emit broadcast waves at the same timing. The transmitters 30p and 30s may be provided with a single common antenna for transmitting radio waves. The configuration of the modulation device 20 will be described in detail below with reference to FIG. 2.

[0031] The receiver 40p receives the broadcast waves transmitted from the transmitter 30p via Pch and outputs them to the demodulation device 50. The receiver 40s receives the broadcast waves transmitted from the transmitter 30s via Sch and outputs them to the demodulation device 50. The receivers 40p and 40s may be provided with a single common antenna for receiving radio waves.

[0032] When CB transmission is being performed, the demodulation device 50 demodulates the received signals of the receivers 40p and 40s, and decodes and outputs the data signals of each layer and the data signal of the Lch transmitted via the Pch and Sch, respectively. The configuration of the demodulation device 50 will be described in detail later with reference to FIG.

[0033] In this embodiment, the transmission / reception system 1 transmits a service for fixed reception and a service for mobile reception using two channels, Pch and Sch, based on CB transmission in hierarchical transmission using time division multiplexing. In this configuration, the transmission / reception system 1 according to this embodiment adds a signal for the service for fixed reception or a future extension area to the OFDM frame of Sch so that the OFDM frame lengths of Pch and Sch are completely the same. In this way, the transmission / reception system 1 can simultaneously demodulate Pch and Sch by aligning the OFDM frame lengths between channels and synchronizing the transmission timing. As a result, it is possible to achieve both a service for mobile reception using single-channel transmission and a service for fixed reception using channel bonding.

[0034] In this embodiment, the transmission / reception system 1 transmits services for mobile reception using layer A XMI packets, transmits services for fixed reception using layer B XMI packets, and transmits future extension areas using layer C XMI packets. The transmission / reception system 1 also transmits services for fixed reception using both Pch and Sch channels, and transmits services for mobile reception using only Pch. Note that the types and number of broadcast services, the types and number of channels over which CB transmission is performed, and the types and usage modes of XMI packet layers are not limited to those exemplified here.

[0035] Next, we will explain the configurations of the modulation device 20 and the demodulation device 50. The configurations of the remultiplexing device 10, transmitter 30 and receiver 40 are well known to those skilled in the art, so detailed explanations will be omitted.

[0036] Fig. 2 is a diagram showing an example of the configuration of the modulation device 20 in Fig. 1. The modulation device 20 includes an input I / F unit 21, an adjustment unit 22, a synchronization signal generation unit 23, a TMCC generation unit 24, subframe generation units 25a, 25b, and 25c, an Lch separation unit 26, and a frame configuration unit 27 (27a and 27b).

[0037] The input I / F unit 21 inputs a re-multiplexed frame configured in the re-multiplexing device 10. The input I / F unit 21 outputs the input re-multiplexed frame to the adjustment unit 22, the synchronization signal generation unit 23, the TMCC generation unit 24, the subframe generation units 25a, 25b, and 25c, and the Lch separation unit 26.

[0038] When CB transmission is performed using multiple subframes with different FFT sizes and GI ratios, the adjustment unit 22 adjusts the FFT size and GI ratio between the subframes. The adjustment unit 22 determines whether or not adjustment of the FFT size and GI ratio is necessary based on control information included in the re-multiplexed frame. If it is determined that adjustment is necessary, the adjustment unit 22 generates update information for updating the FFT size, GI ratio, etc., and for setting a future extension region (see FIG. 4B), and outputs the update information to the TMCC generation unit 24 and the IFFT / GI addition units 217 and 218 of the subframe generation units 25a, 25b, and 25c.

[0039] The synchronization signal generator 23 generates a frame synchronization signal for synchronizing the Pch and Sch OFDM frames, and outputs the generated frame synchronization signal to each of the frame configuration units 27a and 27b.

[0040] The TMCC generator 24 generates TMCC signals to be transmitted on Pch and Sch based on the TMCC information included in the input remultiplexed frame and the update information from the adjuster 22. Specifically, the TMCC generator 24 may multiplex information related to CB transmission onto the TMCC information based on the input TMCC information and update information to generate TMCC information bits, and then generate a TMCC signal based on the TMCC information bits. The TMCC generator 24 outputs the TMCC signal to be transmitted on Pch to the frame composer 27a. The TMCC generator 24 outputs the TMCC signal to be transmitted on Sch to the frame composer 27b.

[0041] Subframe generators 25a, 25b, and 25c generate subframes by performing predetermined processing such as error correction coding and carrier modulation on the input remultiplexed frame. Subframe generators 25a, 25b, and 25c output the generated subframes to frame constructors 27a and 27b. Because subframe generators 25a, 25b, and 25c have the same configuration, subframe generators 25a, 25b, and 25c may hereinafter be collectively referred to as "subframe generator 25." A detailed description of subframe generator 25 will be given later with reference to FIG. 3. In this embodiment, subframe generator 25a, which serves as a first subframe generator, is used to transmit a first data signal for a service intended for mobile reception. Subframe generator 25b, which serves as a second subframe generator, is used to transmit a second data signal for a service intended for fixed reception. Subframe generator 25c is used to transmit a future extension region (see FIG. 4B). However, this division of roles among the subframe generation units 25a, 25b, and 25c is merely an example, and the present invention is not limited to this.

[0042] The Lch separator 26 separates the Lch data signal from the input remultiplexed frame and outputs it to each of the subframe generators 25a, 25b, and 25c.

[0043] The frame constructing units 27 (27a, 27b) construct a time division multiplexing frame to be transmitted and output it to the transmitters 30 (30p, 30s). The frame constructing unit 27a, as a first frame constructing unit, constructs a frame to be transmitted on Pch and outputs it to the transmitter 30p. The frame constructing unit 27b, as a second frame constructing unit, constructs a frame to be transmitted on Sch and outputs it to the transmitter 30s. Specifically, the transmitters 30p, 30s switch the input destination of the signal between the synchronization signal generating unit 23, the TMCC generating unit 24, and the subframe generating units 25a, 25b, 25c at the same timing, and output the input signal to the transmitters 30p, 30s for transmission.

[0044] As described above, the modulation device 20 is configured to switch the frame synchronization signal, TMCC, and subframe in the time domain for CB transmission using hierarchical division based on time division multiplexing. The modulation device 20 uses the same frame synchronization signal for two channels (Pch, Sch) and inserts an appropriate TMCC and subframe for each channel. Note that FIG. 2 shows an example having three subframe generators, and as described above, the subframe generators 25a, 25b, and 25c are the same processing block. To synchronize the outputs to the transmitters 30p and 30s, the OFDM frame lengths output from the frame configuration units 27a and 27b are the same. The switching processes in the frame configuration units 27a and 27b are completely synchronized.

[0045] Fig. 3 is a diagram showing an example configuration of the subframe generation unit 25 in Fig. 2. The modulation device 20 includes an input I / F unit 201, an error correction coding unit 202, a bit interleaving unit 203, a mapping unit 204, system separation units 205a, 205b, and 205c, a pilot signal generation unit 206, an MISO coding unit 207, layer combining units 211 and 212, time-frequency interleaving units 213 and 214, OFDM subframe configuration units 215 and 216, and IFFT-GI adding units 217 and 218. The error correction coding unit 202, the bit interleaving unit 203, and the mapping unit 204 are provided corresponding to layers A, B, and C, respectively, but Fig. 3 shows only the configuration corresponding to layer A for simplicity of illustration. The layer combining unit 211, the time-frequency interleaving unit 213, the OFDM subframe structuring unit 215, and the IFFT-GI adding unit 217 are provided corresponding to the Pch. The layer combining unit 212, the time-frequency interleaving unit 214, the OFDM subframe structuring unit 216, and the IFFT-GI adding unit 218 are provided corresponding to the Sch.

[0046] Input I / F unit 201 receives a re-multiplexed frame as input from re-multiplexing device 10 via input I / F unit 21 in Fig. 2. Input I / F unit 201 extracts the data signal of each layer from the input re-multiplexed frame and outputs it to error correction coding unit 202 of the corresponding layer. Input I / F unit 201 extracts the Lch data signal from the input re-multiplexed frame using the above-mentioned Lch separation unit 26 (see Fig. 2), and outputs it to OFDM subframe configuration unit 215 and OFDM subframe configuration unit 216.

[0047] The error correction coding unit 202 performs error correction coding on the input data signal of layer A in units of FEC (Forward Error Correction) blocks, which are units of error correction coding processing, and outputs the result to the bit interleaving unit 203 .

[0048] The bit interleaving unit 203 performs bit-by-bit interleaving on the data string output from the error correction coding unit 202. An example of bit-by-bit interleaving is bit rotation, which blocks the bit string in predetermined units and changes the bit order within each block. The bit interleaving unit 203 outputs the interleaved data string to the mapping unit 204.

[0049] The mapping unit 204 maps the data sequence output from the bit interleaving unit 203 onto an IQ plane for each predetermined number of bits based on the modulation scheme of the corresponding layer, and performs carrier modulation. In this way, the mapping unit 204 converts the data sequence into carrier symbols. The mapping unit 204 outputs the generated carrier symbols to the system demultiplexing unit 205a.

[0050] The demultiplexer 205a receives carrier symbols obtained by carrier-modulating data signals of layer A from the mapping unit 204 provided corresponding to layer A. The demultiplexer 205a separates (divides) the input carrier symbols into two systems (a first system corresponding to Pch and a second system corresponding to Sch). In the physical layer division mode, the demultiplexer 205a divides the carrier symbols in units of subcarriers. Specifically, the demultiplexer 205a divides the input carrier symbols in accordance with an integer ratio of data signals of layer A that can be allocated to each of a plurality of physical channels constituting CB transmission. The demultiplexer 205a outputs the carrier symbols of the first system to the layer combiner 211 and outputs the carrier symbols of the second system to the layer combiner 212.

[0051] Similar to the system separation unit 205a, the system separation unit 205b separates the data signals (carrier symbols) of layer B into two systems (first and second systems), outputs the first system to the layer combining unit 211, and outputs the second system to the layer combining unit 212. Similar to the system separation unit 205a, the system separation unit 205c separates the data signals (carrier symbols) of layer C into two systems (first and second systems), outputs the first system to the layer combining unit 211, and outputs the second system to the layer combining unit 212. In this way, the system separation units 205a, 205b, and 205c distribute the data signals into multiple systems corresponding to multiple physical channels.

[0052] Pilot signal generating section 206 generates a pilot signal to be incorporated into an OFDM frame based on the TMCC information input from input I / F section 201 , and outputs the generated pilot signal to OFDM subframe configuring section 215 and OFDM subframe configuring section 216 .

[0053] The hierarchical combining unit 211 hierarchically combines the carrier symbols output from the system demultiplexing units 205a, 205b, and 205c, and outputs the combined signal to the time-frequency interleaving unit 213. The hierarchical combining unit 212 hierarchically combines the carrier symbols output from the system demultiplexing units 205a, 205b, and 205c, and outputs the combined signal to the time-frequency interleaving unit 214.

[0054] The time-frequency interleaving unit 213 performs interleaving in the time direction and frequency direction on the carrier symbols output from the layer combining unit 211, and outputs the result to the OFDM subframe configuring unit 215. The time-frequency interleaving unit 214 performs interleaving in the time direction and frequency direction on the carrier symbols output from the layer combining unit 212, and outputs the result to the OFDM subframe configuring unit 216.

[0055] When MISO (Multiple-Input Single-Output) transmission is performed, the MISO encoding unit 207 performs space-time coding on the carrier symbols output from the time-frequency interleaving unit 213 and outputs the resulting signal to the OFDM subframe configuration unit 215. MISO transmission is a scheme in which a transmitting side simultaneously transmits information signals (streams) in the same frequency band using multiple transmitting antennas, and a receiving side receives the information signals transmitted from the multiple transmitting antennas using a single receiving antenna. The space-time coding performed by the MISO encoding unit 207 may be, for example, Space Time Block Coding (STBC) coding or Space Frequency Block Coding (SFBC) coding. When performing STBC coding, the MISO encoding unit 207 performs complex conjugation and sign inversion on pairs of two data symbols in the time direction. When performing SFBC coding, the MISO encoding unit 207 performs complex conjugation and sign inversion on pairs of two data symbols in the frequency direction.

[0056] In this way, the output source for outputting carrier symbols to OFDM subframe configuration section 216 is switched between when CB transmission and MIMO transmission in physical layer division mode are performed and when MISO transmission is performed. In conjunction with this switching, the output destination of carrier symbols from system demultiplexing section 205 is also switched.

[0057] The OFDM subframe configuration unit 215 adds the Lch data signal, pilot signal, and TMCC signal to the input carrier symbols to configure an OFDM subframe, and outputs this to the IFFT·GI adding unit 217. The OFDM subframe configuration unit 216 adds the Lch data signal, pilot signal, and TMCC signal to the input carrier symbols to configure an OFDM subframe, and outputs this to the IFFT·GI adding unit 218. In this way, the OFDM subframe configuration units 215 and 216 multiplex TMCC information onto each of the data signals distributed to the multiple systems and send them out.

[0058] The IFFT / GI adding unit 217 performs IFFT and adds a GI to the OFDM subframe output from the OFDM subframe structuring unit 215, and outputs the result to the transmitter 30p. The IFFT / GI adding unit 218 performs IFFT and adds a GI to the OFDM subframe output from the OFDM subframe structuring unit 216, and outputs the result to the transmitter 30s.

[0059] In a MIMO modulation device for CB transmission using hierarchical division based on a frequency division method, as described in Patent Document 1 and the like, the same FFT size and GI ratio are used for all layers. In such a configuration, it is not possible to set the FFT size and GI ratio for each layer. In the modulation device 20 according to this embodiment shown in Figures 2 and 3, most of the block configuration is the same as the block configuration of a MIMO modulation device, thereby sharing each processing block and reducing the circuit size.

[0060] 4A and 4B are diagrams showing an example of the structure of an OFDM frame transmitted by time division multiplexing in the transmission and reception system 1. In this embodiment, the modulation device 20 aligns the OFDM frame length between channels and synchronizes the transmission timing, thereby enabling simultaneous demodulation of Pch and Sch.

[0061] In Figures 4A and 4B, the horizontal axis represents time and the vertical axis represents frequency (channel). In Figures 4A and 4B, the Pch OFDM frame is configured by arranging, from the beginning, a frame synchronization signal, TMCC, a subframe for a service for mobile reception, and a subframe for a service for fixed reception. Here, the FFT size for the service for mobile reception is set to 8k. The FFT size for the service for fixed reception is set to 32k. Both Figures 4A and 4B show an example in which the frame length of Sch is adjusted to match the frame length of Pch. As described above, in the example of this embodiment, the service for mobile reception is arranged only for Pch.

[0062] 4A shows an example in which a service for fixed reception, which has the same FFT size and GI ratio as the service for mobile reception, is placed in Sch in the section in Pch where the service for mobile reception is placed, thereby aligning the frame lengths of Pch and Sch. In the example of FIG. 4A, the service for fixed reception is placed, in principle, with an FFT size of 32k. As an exception, a service for fixed reception, whose FFT size has been changed to 8k, is placed only in the section in Sch where the service for mobile reception is placed. By arranging in this way, the modulation device 20 can align the frame lengths of Pch and Sch by simple processing.

[0063] 4B shows an example in which a service for fixed reception with an FFT size of 32k is arranged in Sch even in a section in which a service for mobile reception is arranged in Pch, while the frame lengths of Pch and Sch are aligned. In the example of FIG. 4B, the FFT sizes are different between Pch and Sch in the section in which a service for mobile reception is arranged. In such a case, if an attempt is made to arrange a service for fixed reception with an FFT size of 32k in all sections except the frame synchronization signal and TMCC, it may not be possible to align the length of the Sch subframe with the Pch subframe.

[0064] Therefore, the modulation device 20 may allocate services for fixed reception with an FFT size of 32k as much as possible in sections other than the frame synchronization signal and TMCC of Sch, as long as the total subframe length does not exceed the Pch subframe length. If the total subframe length of Sch is shorter than the Pch subframe after allocating services for fixed reception with an FFT size of 32k, the modulation device 20 may set a region such as a future extension region in Sch as shown in FIG. 4B to align the subframe lengths of Pch and Sch. The future extension region may be configured, for example, with a symbol sequence indicating null. By arranging in this manner, the modulation device 20 can align the frame lengths of Pch and Sch while maximizing the transmission capacity of services for fixed reception.

[0065] 4A and 4B is realized by the adjustment unit 22 of the modulation device 20 outputting update information including an updated FFT size and GI ratio, and setting information for a future extension region, to the TMCC generation unit 24 and the IFFT·GI addition units 217 and 218 of the subframe generation unit 25. FIG. 5 is a flowchart showing an example of the operation of the adjustment unit 22 of FIG. 2. The adjustment unit 22 may execute the process of FIG. 5 every time it receives a re-multiplexed frame from the multiplexing device 10 via the input I / F unit 21.

[0066] 5, the adjustment unit 22 determines whether or not the target signal is a signal that should be transmitted via CB. Specifically, the adjustment unit 22 may determine whether or not the target signal is a signal that should be transmitted via CB by referring to the CB flag of the TMCC information included in the synchronization control XMI packet of the input re-multiplexed frame. If the target signal is a signal that should be transmitted via CB (YES in step S1), the adjustment unit 22 proceeds to step S2, and if not (NO in step S1), the adjustment unit 22 ends the processing of the flowchart.

[0067] In step S2, adjustment unit 22 determines whether the number of subframes transmitted and received by CB transmission is two or more. For example, if the number of subframes is included in the TMCC information included in the synchronization control XMI packet of the input remultiplexed frame, adjustment unit 22 may refer to that number and determine whether the number of subframes is two or more. If the number of subframes is two or more (YES in step S2), adjustment unit 22 proceeds to step S3, and if not (NO in step S2), ends the processing of the flowchart.

[0068] In step S3, the adjustment unit 22 determines whether at least one of the FFT size and the GI ratio differs between the subframes. For example, if the TMCC information included in the input re-multiplexed frame includes information on the FFT size and the GI ratio of each subframe, the adjustment unit 22 may refer to that information and determine whether at least one of the FFT size and the GI ratio differs. If at least one of the FFT size and the GI ratio differs (YES in step S3), the adjustment unit 22 proceeds to step S4; if not (NO in step S3), the adjustment unit 22 ends the processing of the flowchart.

[0069] In step S4, the adjustment unit 22 generates update information for updating the FFT size and GI ratio and for setting a future extension region, and outputs the generated update information to the IFFT / GI adding units 217 and 218 of the subframe generation units 25a, 25b, and 25c whose FFT sizes and GI ratios should be updated. For example, to realize the CB transmission of FIG. 4A, the adjustment unit 22 may overwrite (update) the FFT size and GI ratio of the corresponding Sch subframe to be the same as the FFT size and GI ratio of the corresponding Pch subframe, and generate update information indicating the update. Alternatively, for example, to realize the CB transmission of FIG. 4B, the adjustment unit 22 may set the FFT size of the Sch subframe to 32k, maximize the section for fixed reception services, and generate update information for setting a future extension region required to match the frame length with the Pch subframe.

[0070] The adjustment unit 22 outputs the generated update information to the TMCC generation unit 24 and the IFFT / GI addition units 217, 218 of the subframe generation unit 25. In response to this, the TMCC generation unit 24 updates the items of the corresponding subframe based on the update information notified by the adjustment unit 22. The subframe generation unit 25 sets the FFT size and the GI ratio based on the notified update information. In addition, in Figures 4A and 4B, the system separation unit 205 of the layer for services for mobile reception performs processing to allocate all data to Pch, and the system separation unit 205 of the layer for services for fixed reception performs processing to allocate all data to Sch.

[0071] In this way, the modulation device 20 adds a signal for a service for fixed reception or a future extension region to the OFDM frame of Sch so that the OFDM frame lengths of Pch and Sch are completely the same. In this way, the modulation device 20 on the transmitting side aligns the OFDM frame lengths between channels and synchronizes the transmission timing, allowing the receiving side to simultaneously demodulate Pch and Sch. As a result, it is possible to achieve both a service for mobile reception using single-channel transmission and a service for fixed reception using channel bonding.

[0072] FIG. 6 is a diagram showing an example of the configuration of the demodulator 50 of FIG. 1. The demodulator 50 receives CB transmissions in a hierarchical division manner using a time-division multiplexing system. The demodulator 50 includes tuner-to-A / D (Analog-to-Digital) converters 51 and 52, synchronization signal demodulators 53 and 54, frame separators 55 and 56, TMCC demodulators 57 and 58, and a CB demodulator 59. In FIG. 6, the tuner-to-A / D converter 51, synchronization signal demodulator 53, frame separator 55, and TMCC demodulator 57 process signals received via Pch. The tuner-to-A / D converter 52, synchronization signal demodulator 54, frame separator 56, and TMCC demodulator 58 process signals received via Sch. Solid arrows indicate the flow of data, and dotted arrows indicate the flow of control information.

[0073] The tuner A / D converter 51, which is one of the multiple tuners, receives the received signal from the receiver 40p. The tuner A / D converter 51 selects and acquires the signal of a specified physical channel from the received signal. The tuner A / D converter 51 performs A / D conversion on the acquired signal and outputs the A / D converted signal to the synchronization signal demodulator 53.

[0074] The synchronization signal demodulator 53 demodulates the frame synchronization signal placed at the beginning of the OFDM subframe from the signal output from the tuner and A / D converter 51, and acquires the information contained in the frame synchronization signal. In this way, the synchronization signal demodulator 53 extracts the frame synchronization signal from the signal received by the tuner and A / D converter 51. The synchronization signal demodulator 53 outputs the extracted frame synchronization signal and information on other OFDM subframes to the frame separator 55.

[0075] The frame separator 55 separates the input signal into a TMCC and a time division multiplexing frame, and outputs the separated TMCC and time division multiplexing frame to a TMCC demodulator 57 and a CB demodulator 59, respectively.

[0076] The TMCC demodulator 57 demodulates the TMCC signal from the TMCC output from the frame separator 55 and acquires the TMCC information contained in the TMCC signal. In this way, the TMCC demodulator 57 extracts the TMCC information from the signal received by the tuner and A / D converter 51. The TMCC demodulator 57 outputs the extracted TMCC information to the CB demodulator 59. Based on the extracted TMCC information, the TMCC demodulator 57 instructs the pilot extractor 503 (see FIG. 7 ) included in the CB demodulator 59 as to the position of the pilot carrier where the pilot signal is allocated. The TMCC demodulator 57 also references the CB flag included in the extracted TMCC information to determine whether the received signal is a CB transmission or a single-channel transmission. If it is a CB transmission, the TMCC demodulator 57 sets the frequency of the paired channel in the Sch-side tuner (tuner and A / D converter 52) using information in the control signal multiplexed on the TMCC, etc. Here, the TMCC demodulation unit 57 may use a method described in, for example, Patent Document 2, etc., to identify the frequency of the paired channel using information in the control signal multiplexed onto the TMCC, etc.

[0077] In this way, the frame separator 55 and the TMCC demodulator 57 identify the subframe transmitted via CB from the TMCC, and input the subframe to the CB demodulator 59 together with the TMCC information.

[0078] The operations of the tuner / A / D conversion unit 52, synchronization signal demodulation unit 54, frame separation unit 56, and TMCC demodulation unit 58 are similar to those of the tuner / A / D conversion unit 51, synchronization signal demodulation unit 53, frame separation unit 55, and TMCC demodulation unit 57, except that the processing target is the signal received by the receiver 40s, and therefore detailed description thereof will be omitted. However, the TMCC demodulation unit 58 does not determine whether the received signal is a CB transmission or a single-channel transmission.

[0079] The CB demodulation unit 59 demodulates the CB-transmitted OFDM subframe. Fig. 7 is a diagram showing an example configuration of the CB demodulation unit 59 of Fig. 6. The CB demodulation unit 59 includes GI removal and FFT units 501 and 502, pilot extraction units 503 and 504, channel estimation units 505 and 506, waveform equalization units 507 and 508, time-frequency deinterleaving units 509 and 510, a synthesis unit 511, an LLR calculation and error correction decoding unit 512, and an output I / F unit 513. In Fig. 7, the GI removal and FFT unit 501, pilot extraction unit 503, channel estimation unit 505, waveform equalization unit 507, and time-frequency deinterleaving unit 509 process signals received via Pch. The GI removal / FFT unit 502, pilot extraction unit 504, channel estimation unit 506, waveform equalization unit 508, and time / carrier deinterleaving unit 510 process the signal received via Sch.

[0080] The GI removal / FFT unit 501 performs GI removal and FFT on the output signal of the frame separation unit 55 and outputs the obtained OFDM frame to the pilot extraction unit 503 .

[0081] The pilot extraction unit 503 extracts pilot signals allocated to pilot carriers specified by the TMCC demodulation unit 57 in Fig. 6 from the OFDM frame output from the GI removal / FFT unit 501. The pilot extraction unit 503 outputs the extracted pilot signals to the channel estimation unit 505. The pilot extraction unit 503 also outputs the OFDM frame input from the GI removal / FFT unit 501 to the waveform equalization unit 507.

[0082] The channel estimation unit 505 performs channel estimation using the pilot signal output from the pilot extraction unit 503 , and outputs the estimated value to the waveform equalization unit 507 .

[0083] Based on the estimated value output from the channel estimation unit 505, the waveform equalization unit 507 corrects (equalizes) the signal distortion generated in the transmission path for the OFDM frame output from the pilot extraction unit 503, and outputs the equalized signal to the time-frequency deinterleaving unit 509.

[0084] The time-frequency deinterleaving unit 509 performs deinterleaving on the output signal of the waveform equalizing unit 507 in a manner opposite to the interleaving performed by the time-frequency interleaving unit 213 of the modulating device 20 , and outputs the result to the combining unit 511 .

[0085] The operations of the GI removal and FFT unit 502, pilot extraction unit 504, channel estimation unit 506, waveform equalization unit 508, and time and carrier deinterleaving unit 510 are similar to those of the GI removal and FFT unit 501, pilot extraction unit 503, channel estimation unit 505, waveform equalization unit 507, and time and carrier deinterleaving unit 509, except that the processing target is the received signal of the receiver 40s (see FIG. 6), and therefore detailed description thereof will not be repeated.

[0086] The combining unit 511 combines (CB combining) the output signals of the time-frequency deinterleaving units 509 and 510 using processing that is the opposite of the system separation performed by the system separation units 205a, 205b, and 205c of the modulation device 20, and outputs the combined signals to the LLR calculation and error correction decoding unit 512.

[0087] 4A, the Pch subframe includes a service for mobile reception (single channel transmission) and a service for fixed reception (CB transmission), while the Sch subframe includes only a service for fixed reception. Therefore, in the Pch mobile reception service section, the combiner 511 selects only the data of input 2 (receiver 40s). In the Pch fixed reception service section, the combiner 511 combines the data of input 1 (receiver 40p) and input 2 (receiver 40s).

[0088] Specifically, in the examples of Figures 4A and 4B, the Pch subframe includes a service for mobile reception (single channel transmission) and a service for fixed reception (CB transmission). On the other hand, the Sch subframe includes only a service for fixed reception. Therefore, when acquiring a service for fixed reception, the synthesis unit 511 selects data for receiver 40s in the Pch service section for mobile reception, and selects data for receiver 40p and receiver 40s in the Pch service section for fixed reception, and synthesizes these. However, the synthesis unit 511 excludes data in the future extension region of Sch in Figure 4B from the data to be synthesized. When acquiring a service for fixed reception, the synthesis unit 511 acquires data in the Pch service section for mobile reception.

[0089] The LLR calculation and error correction decoding unit 512 calculates an LLR (Log Likelihood Ratio) for each bit of the output signal of the combining unit 511, and performs error correction decoding of the output signal of the combining unit 511 using the calculated LLR to obtain a data signal of each layer. The LLR calculation and error correction decoding unit 512 outputs the obtained data signal of each layer to the output I / F unit 513.

[0090] The output I / F unit 513 converts the data signal of each layer output from the LLR calculation and error correction decoding unit 512 into IP (Internet Protocol) packets and outputs them.

[0091] As described above, the modulation device 20 is capable of channel bonding transmission, which combines and transmits video and audio data signals over multiple physical channels. The modulation device 20 includes subframe generators 25 (25a, 25b, 25c), frame constructors 27 (27a, 27b), and an adjustment unit 22. The subframe generator 25a generates a first subframe based on a first data signal and outputs the first subframe. The subframe generator 25b generates a second subframe based on a second data signal and outputs the second subframe. The frame constructor 27a outputs the first subframe or the second subframe to the Pch. The frame constructor 27b outputs the second subframe to the Sch channel. The adjustment unit 22 adjusts the operation of the subframe generator 25. The frame constructor 27a outputs the input signal to the Pch while switching the input signal destination between the subframe generator 25a and the subframe generator 25b at a predetermined timing. Frame constructor 27b outputs a signal based on the second subframe to Sch. Adjuster 22 adjusts the operation of subframe generator 25 so that the frame length of the signal output by frame constructor 27b to Sch is the same as the frame length of the signal output by frame constructor 27a to Pch.

[0092] Therefore, according to this embodiment, when transmitting broadcasting services based on CB transmission in hierarchical transmission using time division multiplexing, it becomes easy to synchronize frames between channels even if the OFDM frame configuration is different in each channel.

[0093] Note that frame constructor 27a may output a signal consisting of multiple layers including a first subframe and a second subframe to Pch. Frame constructor 27b may output a signal consisting of a single layer of the second subframe to Sch. With this configuration, it is easy to synchronize frames between channels, even when one physical channel transmits multiple types of broadcast services and the other channel transmits a single broadcast service, as in Figures 4A and 4B.

[0094] Furthermore, adjustment unit 22 adjusts the operation of subframe generation unit 25 so that the FFT size and GI ratio of the second subframe are the same as those of the first subframe. With this configuration, even if the FFT size and GI ratio of the subframe to be transmitted differ depending on the physical channel, it becomes easy to synchronize frames between channels.

[0095] Furthermore, adjustment unit 22 may output symbols related to the future extension region from frame configuration unit 27b and adjust the operation of subframe generation unit 25 so that the frame length of the signal based on the second subframe is the same as the frame length of the signal output to Pch by frame configuration unit 27a. With this configuration, it becomes easy to synchronize frames between channels as shown in Fig. 4B, even if the FFT size, GI ratio, etc. are not standardized between physical channels as shown in Fig. 4A.

[0096] Furthermore, the modulation device 20 may further include a TMCC generator 24 that generates TMCC information related to the transmission of a data signal, including flag information indicating whether or not to perform channel bonding transmission. The adjustment unit 22 may determine whether or not to perform channel bonding transmission based on the flag information included in the TMCC information, and adjust the operation of the subframe generator 25 when it is determined that channel bonding transmission is to be performed. With this configuration, the operation of the subframe generator 25 can be adjusted only when necessary.

[0097] Furthermore, frame constructor 27a may output the input signal to Pch while switching the input destination of the signal between TMCC generator 24 and subframe generators 25a, 25b, and 25c at a predetermined timing. Frame constructor 27b may output the input signal to Sch while switching the input destination of the signal between TMCC generator 24 and subframe generators 25a, 25b, and 25c at a predetermined timing. With this configuration, a signal including TMCC information can be transmitted via a physical channel.

[0098] The demodulation device 50 receives the video and audio data signals transmitted by the modulation device 20. The demodulation device 50 includes a CB demodulation unit 59 that combines the data signal of the second subframe included in the signal transmitted via Pch and the data signal of the second subframe included in the signal transmitted via Sch, and demodulates the data signal related to the second subframe. Therefore, the demodulation device 50 can combine signals transmitted across multiple physical channels and restore a higher quality signal, even if the types of signals included in the physical channels are different.

[0099] A program may be provided that causes a computer to function as the remultiplexing device 10, the modulation device 20, or the demodulation device 50. The program may be recorded on a computer-readable medium. The computer-readable medium can be used to install the program on a computer. Here, the computer-readable medium on which the program is recorded may be a non-transitory recording medium. The non-transitory recording medium is not particularly limited, and may be, for example, a CD-ROM, a DVD-ROM, or the like.

[0100] Alternatively, a chip may be provided which is configured with a memory that stores programs for executing each process performed by the remultiplexing device 10, the modulation device 20, or the demodulation device 50, and a processor that executes the programs stored in the memory, and is mounted on the remultiplexing device 10, the modulation device 20, or the demodulation device 50.

[0101] The present disclosure is not limited to the above-described embodiments. For example, multiple blocks shown in the block diagrams may be integrated, or one block may be divided. Multiple steps shown in the flowcharts may be executed in parallel or in a different order depending on the processing capabilities of the device executing each step, or as needed, instead of being executed in chronological order as described. Other modifications are possible without departing from the spirit of the present disclosure. [Explanation of symbols]

[0102] 1. Transmission and reception system 10 Remultiplexer 20 Modulator 21 Input I / F section 22 Adjustment part 23 Synchronization signal generator 24 TMCC generation section 25a, 25b, 25c Subframe generation unit 26 Lch separation section 27a, 27b Frame component 30p, 30s transmitter 40p, 40s receiver 50 Demodulator 51,52 Tuner and A / D converter 53,54 Synchronous signal demodulation section 55,56 Frame separation section 57,58 TMCC demodulation section 59 CB demodulation section 201 Input I / F section 202 Error correction coding unit 203 Bit Interleave 204 Mapping Department 205a,205b,205c System separation section 206 Pilot signal generator 207 MISO encoding section 211,212 Layer synthesis unit 213,214 Time-frequency interleaving section 215, 216 OFDM subframe configuration section 217,218 IFFT·GI Addition Section 501,502 GI removal / FFT section 503,504 Pilot Extraction Unit 505,506 Channel Estimation Unit 507,508 Waveform equalization section 509,510 Time-frequency deinterleaving unit 511 Synthesis Section 512 LLR calculation and error correction decoding unit 513 Output I / F section

Claims

1. A transmitting device capable of channel bonding transmission in which video and audio data signals are transmitted by combining multiple physical channels, a first subframe generator that generates a first subframe based on a first data signal and outputs the first subframe; a second subframe generator that generates a second subframe based on the second data signal and outputs the second subframe; a first frame configuration unit that outputs the first subframe or the second subframe to a first physical channel; a second frame constructor configured to output the second subframe to a second physical channel; an adjustment unit that adjusts the operation of the second subframe generation unit; Equipped with the first frame configuration unit outputs the input signal to the first physical channel while switching the input destination of the signal between the first subframe generation unit and the second subframe generation unit at a predetermined timing; the second frame configuration unit outputs a signal based on the second subframe to the second physical channel; the adjustment unit adjusts the operation of the second subframe generation unit so that a frame length of the signal output by the second frame configuration unit to the second physical channel is the same as a frame length of the signal output by the first frame configuration unit to the first physical channel. Transmitting device.

2. the first frame configuration unit outputs a signal including the first subframe and the second subframe to the first physical channel, the signal being composed of a plurality of layers; The second frame configuration unit outputs a signal consisting of a single layer of the second subframe to the second physical channel. The transmitting device according to claim 1 .

3. The transmitting device according to claim 1 , wherein the adjustment unit adjusts the operation of the second subframe generation unit so that an FFT size and a GI ratio of the second subframe are the same as an FFT size and a GI ratio of the first subframe.

4. 2. The transmitting device of claim 1, wherein the adjustment unit outputs symbols relating to a future extension region from the second frame configuration unit and adjusts the operation of the second subframe generation unit so that the frame length of the signal based on the second subframe is the same as the frame length of the signal output to the first physical channel by the first frame configuration unit.

5. a TMCC generating unit that generates TMCC information regarding the transmission of the data signal, including flag information indicating whether or not the channel bonding transmission is to be performed; The adjustment unit determines whether or not to perform the channel bonding transmission based on the flag information included in the TMCC information, and adjusts the operation of the second subframe generation unit when it is determined that the channel bonding transmission is to be performed. The transmitting device according to claim 1 .

6. the first frame configuration unit outputs the input signal to the first physical channel while switching the input destination of the signal between the TMCC generation unit, the first subframe generation unit, and the second subframe generation unit at a predetermined timing; the second frame configuration unit outputs the input signal to the second physical channel while switching the input destination of the signal between the TMCC generation unit and the second subframe generation unit at a predetermined timing; The transmitting device according to claim 5 .

7. A receiving device for receiving a video and audio data signal transmitted by the transmitting device according to claim 2, a demodulation unit that combines the data signal of the second subframe included in the signal transmitted via the first physical channel and the data signal of the second subframe included in the signal transmitted via the second physical channel, and demodulates the data signal related to the second subframe. Receiving device.

8. A program that causes a computer to operate as the transmitting device according to any one of claims 1 to 6 or the receiving device according to claim 7.

9. A transmission method for a transmitting device capable of channel bonding transmission in which video and audio data signals are transmitted by combining multiple physical channels, comprising: The transmitting device a first subframe generator that generates a first subframe based on a first data signal and outputs the first subframe; a second subframe generator that generates a second subframe based on the second data signal and outputs the second subframe; a first frame configuration unit that outputs the first subframe or the second subframe to a first physical channel; a second frame constructor configured to output the second subframe to a second physical channel; an adjustment unit that adjusts the operation of the second subframe generation unit; Equipped with the first frame configuration unit outputs the input signal to the first physical channel while switching the input destination of the signal between the first subframe generation unit and the second subframe generation unit at a predetermined timing; the second frame configuration unit outputs a signal based on the second subframe to the second physical channel; the adjusting unit adjusting the operation of the second subframe generating unit so that a frame length of the signal output by the second frame constructing unit to the second physical channel is the same as a frame length of the signal output by the first frame constructing unit to the first physical channel, A transmission method for a transmitting device.

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