JP7168002B2 - Broadcast transmission system, broadcast transmission/reception system, broadcast transmission method, and broadcast transmission program - Google Patents

Description

The present invention relates to a broadcast transmission system, a broadcast reception system, a broadcast transmission/reception system, a broadcast transmission method, and a broadcast transmission program.

In digital terrestrial television broadcasting, a television receiver can reproduce an image with a screen resolution of about 2000 horizontal x 1000 vertical.

Non-Patent Document 1 describes a transmission system for terrestrial digital television broadcasting. Hereinafter, the digital terrestrial television broadcasting based on the method described in Non-Patent Document 1 is also referred to as the current digital terrestrial television broadcasting.

In Patent Document 1, polarized wave MIMO (Multiple-Input and Multiple-Output) transmission is adopted, data for a movable receiving device is transmitted by a signal of one polarized wave, and fixed data is transmitted by a signal of both polarized waves. A television broadcast system is described that transmits data to receivers that are remotely located.

In addition, Patent Document 2 discloses a new terrestrial broadcasting (also called new terrestrial broadcasting) that enables receivers to reproduce images of higher image quality than the image quality that can be reproduced by current terrestrial digital television broadcasting. It is described that the new terrestrial broadcasting will be provided and that the new terrestrial broadcasting will coexist with the current terrestrial digital television broadcasting.

JP 2016-076789 A WO2018/155544

"Transmission method for terrestrial digital television broadcasting ARIB STD-B31 Version 2.2", [online], March 2014, Association of Radio Industries and Businesses, [searched on November 20, 2018], Internet <URL: https ://www.arib.or.jp/kikaku/kikaku_hoso/std-b31.html2＞

A television receiver that can reproduce video according to the received signal input based on the transmission system of the current terrestrial digital television broadcasting even when the new terrestrial broadcasting and the current terrestrial digital television broadcasting coexist. It is desirable that the video in the current terrestrial digital television broadcasting can be reproduced appropriately. In addition, even if the new terrestrial broadcasting and the current terrestrial digital television broadcasting coexist, there will be a television receiver that can reproduce video according to the received signal input based on the transmission method of the new terrestrial broadcasting. It is desirable to be able to appropriately reproduce the video in the new terrestrial broadcasting. For example, it is desirable that a television receiver compatible with current digital terrestrial television broadcasting can appropriately perform reception quality determination processing. Also, for example, it is desirable that a television receiver compatible with new terrestrial broadcasting can appropriately equalize received signals.

Therefore, even when the new terrestrial broadcasting and the current digital terrestrial television broadcasting coexist, the present invention reproduces video according to the received signal input based on the transmission system of the current digital terrestrial television broadcasting. Broadcasting transmission system and broadcasting reception system in which a television receiver capable of reproducing images corresponding to received signals input based on the transmission system of new terrestrial broadcasting can appropriately reproduce images , a broadcast transmission/reception system, a broadcast transmission method, and a broadcast transmission program.

The broadcast transmission system according to the present invention provides data for one polarized antenna transmission and data for another polarized antenna transmission based on first image quality reproduction data and second image quality reproduction data. and a transmission process that performs processing for transmitting a signal corresponding to the data for one of the polarized wave antenna transmissions and a signal corresponding to the data for the other polarized wave antenna transmission wherein the data configuration means includes an AC (Auxiliary Channel) signal or TMCC (Transmission and Multiplexing Configuration Control) in the data for reproducing the first image quality among the data for transmitting the one polarized antenna. The data for one of the polarization antenna transmissions is generated so that the signals are arranged, and the data configuration means arranges the AC signal or the TMCC signal in the data for the other polarization antenna transmission. The data for transmitting the other polarized wave antenna is generated so that a null carrier is arranged at a position corresponding to the position corresponding to the selected position.

A broadcast receiving system according to the present invention receives first image quality reproduction data in which AC (Auxiliary Channel) signals or TMCC (Transmission and Multiplexing Configuration Control) signals are arranged, and second image quality reproduction data. receiving means for receiving a signal corresponding to the signal; determining means for determining reception quality using the AC signal or the TMCC signal; and video corresponding to the data for reproducing the second image quality based on the reception quality. determining means for determining whether or not to cause a television receiver capable of reproducing the second image quality reproduction data to reproduce an image corresponding to the second image quality reproduction data; and reproduction processing means for causing the television receiver to reproduce an image corresponding to the data for reproducing the second image quality when it is determined that the corresponding image is to be reproduced.

Another broadcast receiving system according to the present invention is adapted to data for first image quality reproduction in which a plurality of AC (Auxiliary Channel) signals or TMCC (Transmission and Multiplexing Configuration Control) signals and pilot signals are respectively arranged. receiving means for receiving a signal; equalizing means for performing equalization processing on the signal corresponding to the data for reproducing the first image quality based on the pilot signal arranged at a predetermined position; a television receiver capable of reproducing video corresponding to the data for reproducing the first image quality, based on the signal corresponding to the data for reproducing the first image quality; reproduction processing means for reproducing video corresponding to the data, and the equalization means, when the pilot signal is not arranged at the predetermined position, based on the pilot signal arranged at another position, It is characterized by performing equalization processing.

A broadcast transmitting/receiving system according to the present invention is characterized by comprising the broadcasting transmitting system according to any aspect, the broadcasting receiving system according to any aspect, or the other broadcasting receiving system according to any aspect. .

A broadcasting transmission method according to the present invention provides data for one polarized antenna transmission and data for another polarized antenna transmission based on first image quality reproduction data and second image quality reproduction data. and perform processing for transmitting a signal corresponding to the data for one of the polarized antenna transmissions and a signal corresponding to the data for the other polarized antenna transmission, and performing processing for transmitting the one polarized antenna An AC (Auxiliary Channel) signal or TMCC (Transmission and Multiplexing Configuration Control) in the data for reproducing the first image quality among the data for antenna transmission of one of the polarized antennas when generating the data for antenna transmission When generating the data for the one polarization antenna transmission and generating the data for the other polarization antenna transmission such that the signals are arranged, in the data for the other polarization antenna transmission, The data for transmission by the other polarization antenna is generated so that a null carrier is arranged in a position corresponding to the position where the AC signal or the TMCC signal is arranged.

A broadcast transmission program according to the present invention provides a computer with data for one polarized wave antenna transmission and another polarized wave antenna transmission based on first image quality reproduction data and second image quality reproduction data. and a process for transmitting a signal corresponding to the data for one of the polarized antenna transmissions and a signal corresponding to the data for the other polarized antenna transmission. and a transmission process to be performed, and in the data configuration process, in the data for reproducing the first image quality of the data for transmitting the one polarized antenna, an AC (Auxiliary Channel) signal or TMCC (Transmission and Multiplexing) Data for one of the polarized antenna transmissions is generated so that a Configuration Control) signal is arranged, and in the data configuration processing, in the data for the other polarized antenna transmission, the AC signal or the TMCC signal The data for transmitting the other polarized wave antenna is generated so that a null carrier is arranged at a position corresponding to the position at which is arranged.

According to the present invention, even when the new terrestrial broadcasting and the current terrestrial digital television broadcasting coexist, the video corresponding to the received signal input based on the current terrestrial digital television broadcasting transmission system is reproduced. Therefore, a television receiver capable of reproducing images corresponding to received signals input based on a transmission system of new terrestrial broadcasting or a television receiver capable of reproducing images appropriately can reproduce images.

1 is a block diagram showing a configuration example of a broadcasting system according to a first embodiment; FIG. 3 is a block diagram showing a configuration example of a modulating section in the first embodiment; FIG. 3 is a block diagram showing a configuration example of a modulating section in the first embodiment; FIG. 3 is a block diagram showing a configuration example of a modulating section in the first embodiment; FIG. FIG. 4 is an explanatory diagram showing an example of a transmission method; 4 is a block diagram showing a configuration example of a demodulator in the first embodiment; FIG. 4 is a block diagram showing a configuration example of a demodulator in the first embodiment; FIG. 4 is a block diagram showing a configuration example of a demodulator in the first embodiment; FIG. 4 is a block diagram showing a configuration example of a demodulator in the first embodiment; FIG. 4 is a flow chart showing the operation of a transmission section in the first embodiment; FIG. 4 is an explanatory diagram showing an example of parameters according to the number of segments used by layer B and the modulation scheme of a 4K signal; FIG. 2 is an explanatory diagram showing an example of OFDM segment configuration in the first embodiment; FIG. FIG. 2 is an explanatory diagram showing an example of OFDM segment configuration in the first embodiment; FIG. FIG. 11 is a block diagram showing a configuration example of a broadcasting system according to a second embodiment; FIG. FIG. 9 is a block diagram showing a configuration example of a modulating section in the second embodiment; FIG. 9 is a block diagram showing a configuration example of a modulating section in the second embodiment; FIG. 9 is a block diagram showing a configuration example of a modulating section in the second embodiment; FIG. 11 is a block diagram showing a configuration example of a demodulator in the second embodiment; FIG. FIG. 11 is a block diagram showing a configuration example of a demodulator in the second embodiment; FIG. FIG. 11 is a block diagram showing a configuration example of a demodulator in the second embodiment; FIG. FIG. 11 is a block diagram showing a configuration example of a demodulator in the second embodiment; FIG. FIG. 11 is an explanatory diagram showing an example of OFDM segment configuration in the second embodiment; FIG. 11 is an explanatory diagram showing an example of OFDM segment configuration in the second embodiment; FIG. 11 is an explanatory diagram showing an example of OFDM segment configuration in the second embodiment; FIG. 11 is an explanatory diagram showing an example of OFDM segment configuration in the second embodiment; 9 is a flow chart showing the operation of a transmission section in the second embodiment; 9 is a flow chart showing the operation of a carrier demodulator in the second embodiment; FIG. 11 is an explanatory diagram showing another example of OFDM segment configuration in the second embodiment; FIG. 11 is an explanatory diagram showing another example of OFDM segment configuration in the second embodiment; FIG. 12 is a block diagram showing a configuration example of a broadcasting transmission system according to a third embodiment; FIG. FIG. 12 is a block diagram showing a configuration example of a broadcast receiving system according to a fourth embodiment; FIG. FIG. 11 is a block diagram showing a configuration example of a broadcast receiving system according to a fifth embodiment; FIG.

Embodiment 1.
A broadcasting system according to a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a configuration example of a broadcasting system 100 according to the first embodiment of the present invention.

As shown in FIG. 1, a broadcasting system 100 according to the first embodiment of the present invention includes a transmitting section 200 and a receiving section 300. FIG.

Antennas 501 and 502 are connected to the transmitter 200 . Also, an antenna 601 is connected to the receiving section 300 via a distributor 700 . A receiver 400 is also connected to the distributor 700 . Antenna 602 and antenna 601 are connected to receiving section 400 via distributor 700 .

Signals input to the antennas 501 and 502 by the transmitter 200 are converted into electromagnetic waves by the antennas 501 and 502 and radiated. Then, the electromagnetic waves are received by antennas 601 and 602 and converted into received signals, and the converted received signals are input to receiving sections 300 and 400 .

Distributor 700 inputs a received signal received by antenna 601 and converted into a signal to receiving section 300 and receiving section 400 . In this example, the antennas 501 and 601 are horizontally polarized antennas, and the antennas 502 and 602 are vertically polarized antennas.

Also, the transmitting unit 200, the receiving unit 300, and the receiving unit 400 may be implemented by a computer equipped with one or more circuits such as a CPU (Central Processing Unit) that executes processing according to program control. Specifically, for example, the transmitting unit 200, the receiving unit 300, and the receiving unit 400 are loaded with software for realizing each operation described below. The transmitting unit 200, the receiving unit 300, and the receiving unit 400 may be configured to realize each operation described below by executing processing according to program control of the software.

In addition, the receiving unit 300 is, for example, based on the transmission system of the current terrestrial digital television broadcasting, a television receiver capable of reproducing video corresponding to an input received signal, or a receiver performing processing corresponding to the received signal. machine. The receiving unit 300 is configured to include, for example, a reception processing unit of the receiving unit 300, a demodulating unit of the receiving unit 300, and a decoding unit of the receiving unit 300.

Next, the configuration of the transmission section 200 will be described with reference to the drawings. As shown in FIG. 1, the transmitting section 200 in the first embodiment of the present invention includes an encoding section 210, a multiplexing section 220, a modulation section 230, a first amplification section 240, and a second amplification section 250. include.

Encoder 210 includes a first encoder 211 , a second encoder 212 and a third encoder 213 .

A signal of “2K” is input to the first encoder 211 and the second encoder 212 . It should be noted that 2K is a general term for images having a screen resolution of about 2000 horizontal x 1000 vertical. Therefore, in the example shown in FIG. 1, a signal corresponding to 2K (hereinafter also referred to as a signal for 2K) is input to the first encoder 211 and the second encoder 212 . The screen resolution of 2K is, for example, 2048 horizontal×1080 vertical, 1920 horizontal×1080 vertical, 2048 horizontal×1152 vertical, 2560 horizontal×1600 vertical, 1440 horizontal×1080 vertical, or the like. The 2K signal is also referred to as data corresponding to the 2K signal. Note that the data according to the 2K signal includes, for example, output data such as audio data, image data and caption data.

Then, the first encoder 211 converts the input signal for 2K into H.264. Encoding processing based on H.264 is performed. Then, the first encoder 211 inputs the encoded 2K signal to the multiplexer 220 . The first encoder 211 is prepared for providing a 1-segment partial reception service (also referred to as a mobile reception service, hereinafter also referred to as 1seg) for mobile phones/mobile terminals. Therefore, the H.264 by the first encoder 211 is A 2K signal after encoding processing based on H.264 is also called a one-segment signal. The one-segment signal is also referred to as data corresponding to the one-segment signal. The data according to the 1seg signal includes, for example, output data such as audio data, image data and caption data. In addition, the data according to the 1seg signal is also referred to as mobile data.

Also, the second encoder 212 performs encoding processing based on MPEG (Moving Picture Experts Group)-2 on the input 2K signal. Then, the second encoder 212 inputs the 2K signal after encoding processing based on MPEG-2 to the multiplexer 220 .

The multiplexing unit 220 multiplexes the 1seg signal input from the first encoder 211 and the 2K signal input from the second encoder 212 . Multiplexing section 220 then inputs the multiplexed signal, which is the signal after multiplexing, to modulation section 230 .

A “4K” signal is input to the third encoder 213 . Note that 4K is a general term for images having a screen resolution of approximately 4000 horizontal pixels by approximately 2000 vertical pixels. Therefore, in the example shown in FIG. 1 , a signal corresponding to 4K (hereinafter also referred to as a 4K signal) is input to the third encoder 213 . Note that the screen resolution of 4K is, for example, 4096 horizontal×2160 vertical, 3840 horizontal×2160 vertical, 4096 horizontal×2304 vertical, 4096 horizontal×2048 vertical, or the like. The 4K signal is also referred to as data corresponding to the 4K signal. Note that the data according to the 4K signal includes, for example, output data such as audio data, image data, and caption data.

Then, the third encoder 213 converts the input 4K signal into H.264. An encoding process based on H.265 is applied. Then, the third encoder 213 uses the H.264 standard. The 4K signal after encoding processing based on H.265 is input to the modulation unit 230 .

Note that the One Seg signal, the 2K signal, and the 4K signal are all TS (Transport Stream).

The modulation unit 230 performs channel coding processing on the input One-Seg signal, 2K signal, and 4K signal, and generates a first Orthogonal Frequency Division Multiplexing (OFDM) signal and a second OFDM signal. . The channel coding process will be described later.

The modulation section 230 inputs the generated first OFDM signal to the first amplification section 240 . Also, the modulation section 230 inputs the generated second OFDM signal to the second amplification section 250 .

A horizontally polarized antenna 501 is connected to the first amplifier 240 . The first amplification section 240 amplifies the first OFDM signal input from the modulation section 230 with a predetermined amplification factor. Then, first amplification section 240 inputs the amplified first OFDM signal to antenna 501 .

The first OFDM signal amplified by the first amplifier 240 is converted into an electromagnetic wave by the antenna 501 and radiated as a horizontally polarized wave.

An antenna 502 for vertically polarized waves is connected to the second amplifier 250 . The second amplifying section 250 amplifies the second OFDM signal input from the modulating section 230 with a predetermined gain. Second amplifier 250 then inputs the amplified second OFDM signal to antenna 502 .

The second OFDM signal amplified by the second amplifier 250 is converted into an electromagnetic wave by the antenna 502 and radiated as a vertically polarized wave.

Electromagnetic waves radiated via the antennas 501 and 502 and received by the antenna 601 are converted into reception signals and input to the reception processing unit of the reception unit 300 . The reception processing unit performs predetermined processing such as processing for amplifying the received signal and processing for converting the frequency of the received signal to the baseband, which is a frequency that can be processed by the demodulation unit of the receiving unit 300, which is the signal processing means in the later stage. is applied to the received signal. The demodulation unit of the reception unit 300 performs demodulation processing, equalization processing, etc. according to the channel coding processing that the modulation unit 230 of the transmission unit 200 performed on the 1seg signal and the 2K signal on the input received signal. to generate the TS signal. The demodulator then inputs the generated TS signal to the decoder of the receiver 300 . The decoding unit has a function of performing predetermined decoding processing on the input TS signal and generating a video signal. Also, the decoding unit can output the generated video signal. The output video signal is input to a video display device such as a television receiver, and video based on the 1seg signal or 2K signal is reproduced.

Next, the configuration of the receiving section 400 will be described with reference to the drawings. As shown in FIG. 1, the receiver 400 according to the first embodiment of the present invention includes a first reception processor 410, a second reception processor 420, a demodulator 430, and a decoder 440. FIG.

A horizontally polarized antenna 601 is connected to the first reception processing unit 410 via a distributor 700 . Electromagnetic waves radiated via the antennas 501 and 502 and received by the antenna 601 are converted into reception signals and input to the first reception processing unit 410 .

An antenna 602 for vertically polarized waves is connected to the second reception processing unit 420 . Electromagnetic waves radiated via the antennas 501 and 502 and received by the antenna 602 are converted into received signals and input to the second reception processing unit 420 .

The first reception processing unit 410 and the second reception processing unit 420 each receive signals at baseband, which is a frequency at which processing for amplifying the received signal and processing in the demodulation unit 430, which is signal processing means at a later stage, can be performed. Predetermined processing, such as processing for converting the frequency of the signal, is applied to the received signal.

Then, first reception processing section 410 inputs the reception signal that has undergone predetermined processing to demodulation section 430 . Second reception processing section 420 also inputs the reception signal that has undergone predetermined processing to demodulation section 430 .

The demodulator 430 demodulates the input received signal according to the transmission channel coding process that the modulator 230 of the transmitter 200 performed on the One Seg signal, the 2K signal, and the 4K signal, and converts the TS Generate a signal. Demodulator 430 then inputs the generated TS signal to decoder 440 . The demodulation processing in demodulation section 430 is performed by each section in demodulation section 430 to be described later.

The decoding unit 440 has a function of performing predetermined decoding processing on the input TS signal and generating a video signal.

For example, the decoder 440 decodes the input TS signal into H.264. It is assumed that decoding processing based on H.265 can be performed to generate a video signal based on the 4K signal. Then, the decoding unit 440 can output the generated video signal. Then, the output video signal is input to a video display device such as a television receiver, and video based on the 4K signal is reproduced.

Further, for example, it is assumed that the decoding unit 440 can perform decoding processing based on MPEG-2 on the input TS signal to generate a video signal based on the 2K signal. Then, the decoding unit 440 can output the generated video signal. Then, the output video signal is input to a video display device such as a television receiver, and video based on the 2K signal is reproduced.

Also, for example, the decoding unit 440 decodes the input TS signal into H.264. It is assumed that decoding processing based on H.264 can be performed to generate a video signal based on the one-segment signal. Then, the decoding unit 440 can output the generated video signal. Then, the output video signal is input to a video display device or the like, and video based on the one-segment signal is reproduced.

Next, transmission line coding processing performed by the modulation section 230 will be described. 2 to 4 are block diagrams showing configuration examples of the modulation section 230 according to the first embodiment of the present invention. As shown in FIGS. 2 to 4, the modulation unit 230 in the first embodiment of the present invention includes an outer code processing unit 261-a, a frame configuration unit 261-b, a layer division unit 262-a, an outer code processing unit 262 -b, first byte-bit converters 263-a to 263-c, energy spreaders 264-a to 264-c, delay correctors 265-a to 265-c, bit-byte converters 266-a to 266-c, byte interleaving processor 267 -a to c, second byte-bit conversion units 268-a to c, convolutional encoding processing units 269-a to c, bit interleaving processing units 270-a to c, mapping processing units 271-a to c, hierarchy Combining unit 272, time interleaving processing unit 273, frequency interleaving processing unit 274, OFDM frame construction unit 275, normalization unit 276-a, b, IFFT (Inverse Fast Fourier Transform) processing unit 277-a, b, guard interval addition processing It includes sections 278-a, b and quadrature modulation processing sections 279-a, b.

The 1seg signal and the 2K signal that are multiplexed with each other are input to the outer code processing unit 261-a. Then, the outer code processing unit 261-a applies a predetermined check code to each of the input 1seg signal and 2K signal. In this example, the outer code processing unit 261-a applies a Reed-Solomon code (RS (204, 188)) to each of the input 1seg signal and 2K signal. Then, the outer code processing unit 261-a inputs the one-segment signal and the 2K signal, which are obtained by adding inspection codes to the input one-segment signal and 2K signal, to the layer dividing unit 262-a.

A 4K signal is input to the frame configuration unit 261-b. Then, the frame configuration unit 261-b performs frame configuration processing such as addition of dummy data (stuffing bytes) for processing the input 4K signal as a TS packet of a predetermined fixed length. Then, the frame configuration unit 261-b inputs the 4K signal subjected to frame configuration processing to the outer code processing unit 262-b.

The outer code processing unit 262-b performs a process of adding a predetermined check code to the input 4K signal. In this example, the outer code processing unit 262-b applies a Reed-Solomon code (RS (204, 188)) to the input 4K signal. Then, the outer code processing unit 262-b inputs a 4K signal obtained by adding a check code to the input 4K signal to the first byte-bit conversion unit 263-b.

The hierarchical division unit 262-a divides the one-seg signal and the 2K signal that are multiplexed with each other, and inputs the one-seg signal to the first byte-bit conversion unit 263-a. Also, the layer dividing unit 262-a inputs the 2K signal to the first byte-bit converting unit 263-c.

Here, the transmission method will be described with reference to the drawings. FIG. 5 is an explanatory diagram showing an example of a transmission method according to this embodiment. In this example, the frequency band corresponding to data transmission between the transmitter 200 and the receivers 300 and 400 is divided into 13 segments and used.

Then, in the frequency band in the horizontal polarization, seven segments consisting of the 1st to 3rd segments and the 10th to 13th segments from the lowest frequency are used for transmitting data according to the 2K signal, and C called hierarchy. In FIG. 5, the C hierarchy is indicated by diagonal lines slanting downward to the right. The first segment from the lowest frequency is segment No. 11, and the segment with the second lowest frequency is called Segment No. 11. 9, and the third segment with the lowest frequency is segment No. 9. Also called 7. Also, the 10th segment from the lowest frequency is segment No. 6, and the 11th segment with the lowest frequency is segment No. 6. 8, and the 12th segment with the lowest frequency is segment No. 8. 10, and the 13th segment with the lowest frequency is segment No. 10. Also referred to as 12.

Also, in the frequency band in the horizontal polarization, five segments consisting of the 4th to 6th segments and the 8th and 9th segments from the lowest frequency are used for transmitting data according to the 4K signal. called hierarchy. In FIG. 5, the B layer is indicated by diagonal lines slanting to the left. The fourth segment from the lowest frequency is segment No. Also referred to as Segment No. 5, the fifth segment with the lowest frequency. 3, and the sixth segment with the lowest frequency is segment No. 3. Also called 1. Also, the eighth segment from the lowest frequency is segment No. 2, the ninth segment with the lowest frequency is segment No. Also referred to as 4.

In the frequency band of the horizontally polarized wave, the seventh segment from the lowest frequency is used for data transmission according to the One Seg signal, and is called the A layer. In FIG. 5, the A layer is shaded. The seventh segment from the lowest frequency is segment No. Also referred to as 0.

Furthermore, in the frequency band in vertical polarization, five segments consisting of the 4th to 6th segments and the 8th and 9th segments from the lowest frequency are also used for transmitting data according to the 4K signal. , is called the B layer.

Therefore, 10 segments, ie, 5 segments of horizontal polarization and 5 segments of vertical polarization, are used for data transmission according to the 4K signal.

In this example, data corresponding to the one-seg signal transmitted using layer A is input to the first byte-bit converter 263-a. Also, data according to the 4K signal transmitted using the B layer is input to the first byte-bit conversion unit 263-b. Then, data according to the 2K signal transmitted using the C hierarchy is input to the first byte-bit conversion unit 263-c.

Here, it is assumed that data is input in units of bytes to the first byte-bit conversion units 263-a to 263-c. Therefore, the first byte-bit conversion units 263-a to 263-c convert the input byte-unit data into bit streams in order of MSB (Most Significant Bit) first.

Then, the first byte-bit converters 263-a to 263-c input the converted bitstreams to the energy spreaders 264-a to 264-c, respectively.

The energy diffusion units 264-a to 264-c apply predetermined energy diffusion processing to the bitstreams input by the first byte-bit conversion units 263-a to 263-c. Specifically, the energy spreading units 264-a to 264-c, for example, use a predetermined PRBS (Pseudo-Random Binary Sequence) and the bits input by the first byte-bit conversion units 263-a to 263-c A bit-by-bit exclusive OR is calculated with the bit string excluding the synchronization byte in the stream. Then, the energy spreading units 264-a to 264-c apply the energy spreading process to the respective bitstreams input by the first byte-bit converting units 263-a to 263-c, and output the result to the delay correcting units 265-a to 265-c. Enter the data for each calculation result.

The delay correction units 265-a to 265-c apply delay correction to the input bitstream as necessary so that the processing end timings of the 1seg signal, the 2K signal, and the 4K signal in the transmission unit 200 are the same. process. Then, the delay correction units 265-a to 265-c respectively input the bitstreams after the processing results to the bit-byte conversion units 266-a to 266-c.

The bit-byte converters 266-a to 266-c convert the input bit-wise data into byte-wise data in MSB first order.

Byte interleave processing units 267-a to 267-c apply convolutional byte interleaving processing to each byte-unit data converted by bit-to-byte conversion units 266-a to 266-c to make delay amounts different from each other. Note that the interleave depth is, for example, 12 bytes.

The second byte-bit conversion units 268-a to 268-c convert the input byte-unit data that has undergone convolutional byte interleaving processing by the byte interleave processing units 267-a to 267-c into bit streams in the order of MSB first. Convert.

The convolutional encoding processing units 269-a to 269-c perform predetermined convolutional encoding processing on the bitstreams that have been subjected to the convolutional byte interleaving processing by the second byte-bit conversion units 268-a to 268-c, respectively. Apply. Specifically, the convolutional encoding processing units 269-a to 269-c set, for each layer, an original code having a constraint length k=7 and an encoding rate of 1/2 as a mother code in the bitstream. At the set coding rate, that is, at the set coding rate of each of the convolutional coding processing units 269-a to 269-c, the punctured convolutional coding processing is performed.

The bit interleave processing units 270-a to 270-c apply bit interleaving processing to the encoded bitstream according to the mapping performed by the subsequent mapping processing units 271-a to 271-c. Specifically, for example, the mapping processing unit 271-a performs QPSK (Quadrature Phase Shift Keying) mapping processing on a bit stream based on the one-seg signal that has been encoded by the convolutional encoding processing unit 269-a. is applied. Therefore, the bit interleave processing unit 270-a performs bit interleave processing for inserting, for example, a 120-bit delay element into the bit stream based on the One Seg signal. Further, the mapping processing unit 271-b performs mapping processing such as 4096 QAM (Quadrature Amplitude Modulation), 1024 QAM, and 256 QAM on the bit stream based on the 4K signal encoded by the convolutional encoding processing unit 269-b. is applied. Therefore, the bit interleave processing unit 270-b performs bit interleave processing for inserting, for example, delay elements of the number of bits corresponding to the mapping processing to the bit stream based on the 4K signal. It is assumed that the bitstream based on the 2K signal encoded by the convolutional encoding processor 269-c is subjected to mapping processing such as 64QAM by the mapping processor 271-c. Therefore, the bit interleave processing unit 270-c performs bit interleave processing for inserting delay elements of 24 to 120 bits, for example, to the bit stream based on the 2K signal.

The mapping processing units 271-a to 271-c perform mapping processing on the bitstreams that have been bit-interleaved by the bit-interleaving processing units 270-a to 270-c. Specifically, the mapping processing unit 271-a, for example, performs QPSK mapping processing on the bit stream based on the 1seg signal that has been bit-interleaved by the bit interleaving processing unit 270-a. Also, the mapping processing unit 271-b performs mapping processing such as 4096QAM, 1024QAM, and 256QAM on the bit stream based on the 4K signal that has undergone bit interleaving processing by the bit interleaving processing unit 270-b. The mapping processing unit 271-c, for example, performs mapping processing such as 64QAM on the bit stream based on the 2K signal that has undergone bit interleaving processing by the bit interleaving processing unit 270-c. Then, the mapping processing units 271-a to 271-c map a signal to which a bitstream based on a 1Seg signal is mapped, a signal to which a bitstream based on a 4K signal is mapped, and a bitstream based on a 2K signal. The signals are input to the hierarchical synthesizing section 272 respectively.

The hierarchical synthesizing unit 272 synthesizes the signals respectively input by the mapping processing units 271-a to 271-c using predetermined parameters, inserts them into the data segment, and performs hierarchical synthesizing processing for speed conversion. In addition, for example, the data segment is 1 according to the A layer (that is, one-segment signal), 10 according to B layer (that is, 4K signal), and 1 according to C layer (that is, 2K signal). It is assumed that 7 are prepared.

The time interleave processing unit 273 temporally disperses the symbol data after modulation (mapping processing) and performs hierarchical synthesis processing on a modulation symbol basis (I, Q axis basis) in order to improve anti-fading performance. interleave processing for a predetermined time is applied to the obtained signal.

The frequency interleave processing unit 274 changes (rotates) the frequency of the carrier (carrier wave) within the 13 segments described above according to time, and performs frequency interleaving such as exchanging the frequency band used between the segments. process. For segments based on one-segment signals, for example, inter-segment interleaving processing, such as exchanging frequency bands with other segments, may not be performed. Further, the frequency interleave processing unit 274 is configured to perform, for example, intersegment interleaving and intra-segment interleaving in combination so that a sufficient interleaving effect can be exhibited while ensuring the segment configuration.

OFDM frame configuration section 275 receives as input a signal subjected to frequency interleaving processing by frequency interleaving processing section 274, a pilot signal, a TMCC (Transmission and Multiplexing Configuration Control) signal, and an AC (Auxiliary Channel) signal. be. Note that the pilot signal is, for example, a continuous carrier. Also, the TMCC signal is, for example, a signal for transmitting control information, and includes, for example, information indicating the synchronization byte of the TS packet. The AC signal is, for example, an extension signal for transmitting additional information about broadcasting. The pilot signal is, for example, pilot signal data. Also, the TMCC signal is, for example, TMCC signal data. The AC signal is, for example, AC signal data. Further, the data corresponding to the frequency-interleaved signal, the pilot signal data, the TMCC signal data, and the AC signal data are collectively referred to as data.

The OFDM frame constructing section 275 then constructs an OFDM frame based on each input signal. Specifically, the OFDM frame configuration unit 275, for example, for each symbol in each OFDM carrier, the value of each signal (1Seg signal, 2K signal, 4K signal, pilot signal, TMCC signal, and AC signal) set. Also, the OFDM frame construction section 275 inserts a null carrier into a predetermined portion of the OFDM frame. The details of the insertion point of the null carrier will be described later.

Note that the OFDM frame configuration unit 275 configures, for example, an OFDM frame for horizontal polarization and an OFDM frame for vertical polarization. Specifically, the OFDM frame configuration unit 275, for example, a signal corresponding to a segment according to the 1Seg signal, a signal corresponding to a segment according to the 2K signal, and 10 segments according to the 4K signal An OFDM frame for horizontal polarization is configured according to signals corresponding to five segments among them, a pilot signal, a TMCC signal, and an AC signal. Further, the OFDM frame configuration unit 275, for example, according to the signals corresponding to the remaining 5 segments among the 10 segments corresponding to the 4K signal, the pilot signal, the TMCC signal, and the AC signal, Construct an OFDM frame for vertical polarization. In addition, even if each pilot signal is configured to transmit a broadcast wave by polarization MIMO to the B layer as in this example, the broadcast wave in the C layer can be appropriately received. It is inserted at the position in the set frequency domain. Details of the OFDM frame constructed by the OFDM frame constructing section 275 and specific insertion positions of the pilot signals will be described later. Hereinafter, the OFDM frame configured by the OFDM frame configuration section 275 is also referred to as an OFDM segment configuration.

Further, the OFDM frame construction unit 275 transmits to the reception unit 300 a TMCC signal indicating that the signal in the B layer is differentially modulated and the signal in the C layer is synchronously modulated. It may be configured to form an OFDM frame.

Note that when the TMCC information indicates that the signal in layer B is differentially modulated and the signal in layer C is synchronously modulated, receiving section 300 performs frequency deinterleaving processing using B Segments according to hierarchy and segments according to C hierarchy are processed separately. By performing such processing, it is possible to prevent segments corresponding to the B layer and segments corresponding to the C layer from being mixed as a result of frequency deinterleaving.

Then, the OFDM frame construction unit 275 inputs, for example, an OFDM frame for horizontal polarization to the normalization unit 276-a. The OFDM frame construction unit 275 also inputs, for example, an OFDM frame for vertical polarization to the normalization unit 276-b.

The normalization units 276-a and 276-b make the transmission signal level of each carrier equal for each of the input OFDM frames so that the ratio of the average powers of the OFDM symbols to each other becomes 1 regardless of the modulation scheme. , are normalized. Then, the normalization units 276-a and 276-b input the respective OFDM frames subjected to normalization processing to the IFFT processing units 277-a and 277-b.

The IFFT processing units 277-a and 277-b perform IFFT processing on each of the input OFDM frames to convert the frequency domain signal into a time domain signal. Then, the IFFT processing units 277-a and 277-b input the converted time domain signals to the guard interval addition processing units 278-a and 278-b, respectively.

The guard interval addition processing units 278-a and 278-b perform guard interval addition processing of adding data for a predetermined time before effective symbols in the time domain signal to the input time domain signal.

The quadrature modulation processing units 279-a and 279-b perform predetermined quadrature modulation processing on the time domain signals input by the guard interval addition processing units 278-a and 278-b. Specifically, the quadrature modulation processing unit 279-a, for example, performs predetermined quadrature modulation processing on the time domain signal input by the guard interval addition processing unit 278-a, and converts it into a first signal having a predetermined transmission frequency. Convert to OFDM signal. Then, the quadrature modulation processing section 279 - a inputs the first OFDM signal to the first amplification section 240 . Further, the quadrature modulation processing unit 279-b, for example, performs predetermined quadrature modulation processing on the time domain signal input by the guard interval addition processing unit 278-b to obtain a second OFDM signal of a predetermined transmission frequency. Convert. Then, the quadrature modulation processing section 279 - b inputs the second OFDM signal to the second amplification section 250 .

Next, the configuration of demodulator 430 will be described with reference to the drawing. 6 to 9 are block diagrams showing the configuration of the demodulator 430 according to the first embodiment of the present invention.

As shown in FIGS. 6 to 9, the demodulation unit 430 in the first embodiment of the present invention includes AD (Analog to Digital) conversion units 511-a, b, orthogonal demodulation processing units 512-a, b, synchronization Reproduction units 513-a, b, FFT (Fast Fourier Transform) processing units 514-a, b, frame extraction units 515-a, b, TMCC signal decoding units 516-a, b, AC signal decoding units 517-a, b , carrier demodulation unit 518, frequency deinterleaving processing unit 519, time deinterleaving processing unit 520, first hierarchical division unit 521, demapping processing units 522-a to 522-c, bit deinterleaving processing units 523-a to 523-c, depuncturing Processing units 524-a to c, layer synthesis unit 525, inner code decoding unit 526, second layer division unit 527, byte deinterleaving processing units 528-a to c, energy despreading processing units 529-a to c, TS A reproduction processing unit 530 and an outer code decoding unit 531 are included.

Received signals that have undergone predetermined processing by the first reception processing unit 410 and the second reception processing unit 420 are input to the AD conversion units 511-a and 511-b, respectively. Specifically, the reception signal that has undergone predetermined processing by the first reception processing unit 410, for example, is input to the AD conversion unit 511-a. Then, the AD converter 511-a converts the received signal, which is an analog signal, into a digital signal. Then, the AD converter 511-a inputs the received signal converted into a digital signal to the quadrature demodulation processor 512-a.

Further, the reception signal that has undergone predetermined processing by the second reception processing section 420, for example, is input to the AD conversion section 511-b. Then, the AD converter 511-b converts the received signal, which is an analog signal, into a digital signal. Then, the AD conversion section 511-b inputs the received signal converted into a digital signal to the quadrature demodulation processing section 512-b.

The quadrature demodulation processors 512-a and 512-b perform predetermined quadrature demodulation processing on the input received signals. Specifically, the quadrature demodulation processing sections 512-a and 512-b mix the input received signal and demodulation signals that are orthogonal to each other to obtain an I component signal and a Q component signal.

Then, quadrature demodulation processing sections 512-a, b input the signals, which are received signals after quadrature demodulation processing, to synchronization recovery sections 513-a, b and FFT processing sections 514-a, b, respectively.

Synchronous reproduction units 513-a and 513-b receive signals input by orthogonal demodulation processing units 512-a and 512-b, signals subjected to FFT processing by FFT processing units 514-a and 514-b, and frame extraction units 515-a and b. Based on the extracted frame synchronization signal, OFDM symbol synchronization and FFT sample frequency are recovered according to the mode (in this example, mode 3) according to the number of carriers in OFDM and the guard interval length. Specifically, the synchronization reproducing units 513-a and 513-b specify (reproduce) the timing for synchronizing the OFDM symbols and the FFT sample frequency, for example, based on the signals input from each unit.

The FFT processing units 514-a and 514-b perform FFT processing on the signals input by the orthogonal demodulation processing units 512-a and 512-b based on the information reproduced by the synchronization reproduction units 513-a and 513-b. 512-a and 512-b transform the input time domain signals into frequency domain signals. Then, the FFT processing units 514-a and 514-b send the converted frequency domain signals to the synchronization reproduction units 513-a and 513-b, the frame extraction units 515-a and 515-b, and the AC signal decoding units 517-a and 517-b. input.

The frame extraction units 515-a and 515-b extract frame synchronization signals from the frequency domain signals input to the FFT processing units 514-a and 514-b. Then, the frame extraction units 515-a,b input the extracted frame synchronization signals to the synchronization reproduction units 513-a,b and the TMCC signal decoding units 516-a,b. Note that the frame extraction units 515-a and b also input the frequency domain signals input by the FFT processing units 514-a and 514-b to the TMCC signal decoding units 516-a and b.

The TMCC signal decoding units 516-a and 516-b extract TMCC information from the TMCC signals in the frequency domain signals output from the FFT processing units 514-a and 514-b. Then, the TMCC signal decoding units 516-a and 516-b include a carrier demodulation unit 518, a frequency deinterleaving processing unit 519, a time deinterleaving processing unit 520, a first hierarchical division unit 521, demapping processing units 522-a to 522-c, The extracted TMCC information is input to bit deinterleave processing units 523-a to 523-c, depuncture processing units 524-a to 524-c, layer synthesis unit 525, second layer division unit 527, and TS reproduction processing unit 530.

The AC signal decoding units 517-a and 517-b extract AC signals from the frequency domain signals input by the FFT processing units 514-a and 514-b. Then, the AC signal decoders 517-a and 517-b extract seismic motion warning information when the structure identification of the AC signal indicates that seismic motion warning information is to be transmitted.

The frequency-domain signals converted by the FFT processing units 514-a and 514-b are input to the carrier demodulation unit 518, respectively. Therefore, the carrier demodulation unit 518, TMCC signal decoding unit 516-a, b (either one of the TMCC signal decoding unit 516-a and TMCC signal decoding unit 516-b may be) input TMCC information , the signals in the frequency domain input to the FFT processing units 514-a and 514-b are subjected to differential demodulation processing and synchronous demodulation processing. Specifically, the carrier demodulation unit 518 identifies each carrier constituting the OFDM signal based on the OFDM segment in the frequency domain signal input by the FFT processing units 514-a and 514-b, and calculates the amplitude of each carrier. and phase information indicating the phase of each carrier. Then, the carrier demodulator 518 inputs the frequency-domain signals transformed by the FFT processors 514-a and 514-b, the amplitude information, and the phase information to the frequency deinterleave processor 519. FIG.

Based on the information input by the carrier demodulation unit 518, the frequency deinterleaving unit 519 converts the frequency of each carrier changed by the frequency interleaving processing performed by the frequency interleaving processing unit 274 and the exchanged other segments. The frequency domain signals converted by the FFT processing units 514-a and 514-b are subjected to frequency deinterleaving processing for restoring the frequency band exchanged between .

Time deinterleaving processing section 520 performs time deinterleaving processing for returning the symbol data temporally dispersed by the time interleaving processing performed by time interleaving processing section 273 to the original temporal order by frequency deinterleaving processing section 519 . Applied to the frequency deinterleaved signal.

The first hierarchical division unit 521 receives the TMCC input by the TMCC signal decoding units 516-a and 516-b (either one of the TMCC signal decoding unit 516-a and the TMCC signal decoding unit 516-b). Based on the information, the time deinterleave processing unit 520 divides the signal subjected to the time deinterleave processing into signals according to each layer. Specifically, the first layer dividing unit 521, for example, in the signal subjected to the time deinterleaving processing by the time deinterleaving processing unit 520, demapping the signal of the carrier of the frequency band corresponding to the A layer to the demapping processing unit 522 -a, input the carrier signal of the frequency band corresponding to the B layer to the demapping processing unit 522-b, and input the carrier signal of the frequency band corresponding to the C layer to the demapping processing unit 522-c do.

Demapping processing unit 522-a, TMCC signal decoding unit 516-a, b (either one of TMCC signal decoding unit 516-a and TMCC signal decoding unit 516-b may be) input TMCC Based on the information, demapping processing corresponding to the mapping processing performed by the mapping processing unit 271-a is performed on the signal input by the first layer dividing unit 521. FIG. In this example, the signal of the carrier of the frequency band corresponding to layer A is subjected to QPSK mapping processing in the mapping processing unit 271-a. Therefore, the demapping processing unit 522-a performs demapping processing according to QPSK on the signal input by the first layer dividing unit 521, and extracts bit information (bitstream).

Demapping processing unit 522-b, TMCC signal decoding unit 516-a, b (either one of TMCC signal decoding unit 516-a and TMCC signal decoding unit 516-b may be) input TMCC Based on the information, demapping processing corresponding to the mapping processing performed by the mapping processing unit 271-b is performed on the signal input by the first layer dividing unit 521. FIG. In this example, the mapping processing unit 271-b performs mapping processing such as 4096 QAM, 1024 QAM, and 256 QAM on the carrier signal of the frequency band corresponding to layer B. FIG. Therefore, the demapping processing unit 522-b performs demapping processing according to the mapping processing on the signal input by the first layer dividing unit 521, and extracts bit information (bitstream).

Demapping processing unit 522-c, TMCC signal decoding unit 516-a, b (either one of TMCC signal decoding unit 516-a and TMCC signal decoding unit 516-b may be) input TMCC Based on the information, demapping processing corresponding to the mapping processing performed by the mapping processing unit 271-c is performed on the signal input by the first layer dividing unit 521. FIG. In this example, the mapping processing unit 271-c performs mapping processing such as 64QAM on the carrier signal of the frequency band corresponding to layer C. FIG. Therefore, the demapping processing unit 522-c performs demapping processing according to 64QAM or the like on the signal input by the first hierarchical division unit 521, and extracts bit information (bitstream).

The bit deinterleaving processing unit 523-a performs bit deinterleaving processing corresponding to the bit interleaving processing performed by the bit interleaving processing unit 270-a on the bitstream extracted by the demapping processing unit 522-a. Specifically, in this example, the bit interleave processing unit 270-a performs bit interleave processing by inserting, for example, a 120-bit delay element to the bit stream based on the One Seg signal. Therefore, the bit deinterleave processing unit 523-a, for example, performs bit deinterleaving processing to eliminate, for example, 120-bit delay elements from the bitstream extracted by the demapping processing unit 522-a.

The bit deinterleaving processing unit 523-b performs bit deinterleaving processing corresponding to the bit interleaving processing performed by the bit interleaving processing unit 270-b on the bitstream extracted by the demapping processing unit 522-b. Specifically, in this example, the bit interleave processing unit 270-b inserts a bit number of delay elements according to the mapping processing in the mapping processing unit 271-b into the bit stream based on the 4K signal, for example. Interleave processing is applied. Therefore, the bit deinterleave processing unit 523-b, for example, performs bit deinterleaving processing for deleting the delay element from the bitstream extracted by the demapping processing unit 522-b.

The bit deinterleaving processing unit 523-c performs bit deinterleaving processing corresponding to the bit interleaving processing performed by the bit interleaving processing unit 270-c on the bitstream extracted by the demapping processing unit 522-c. Specifically, in this example, the bit interleave processing unit 270-c inserts a delay element of 24 to 120 bits according to the mapping processing in the mapping processing unit 271-c into the bit stream based on the 2K signal, for example. bit interleaving is applied. Therefore, the bit deinterleave processing unit 523-c, for example, performs bit deinterleaving processing for deleting the delay element from the bitstream extracted by the demapping processing unit 522-c.

Depuncture processing units 524-a to 524-c receive input from TMCC signal decoding units 516-a and b (either one of TMCC signal decoding unit 516-a and TMCC signal decoding unit 516-b). Bit interpolation of the convolutional code is performed according to the convolutional coding rate specified by the TMCC information. It is assumed that the TMCC information indicates the coding rate for each layer. Therefore, the depuncture processing unit 524-a performs bit interpolation of the convolutional code according to the coding rate of layer A indicated by the TMCC information. Also, the depuncture processing unit 524-b performs bit interpolation of the convolutional code according to the coding rate of the B layer indicated by the TMCC information. Then, the depuncture processing unit 524-c performs bit interpolation of the convolutional code according to the coding rate of the C layer indicated by the TMCC information.

The layer synthesizing unit 525 synthesizes the bit streams of each layer whose bits are interpolated by the depuncture processing units 524-a to 524-c.

The inner code decoding unit 526 performs decoding processing on the bit stream synthesized by the hierarchical synthesizing unit 525 after bits are interpolated by the depuncture processing units 524-a to 524-c. Specifically, the inner code decoding unit 526 subjects the bitstream to decoding processing based on, for example, the Viterbi algorithm.

The second layer dividing unit 527 divides the bitstream decoded by the inner code decoding unit 526 into a bitstream corresponding to each layer based on the TMCC information input by the TMCC signal decoding units 516-a and 516-b. To divide. Specifically, the second layer dividing unit 527, for example, forms a bit stream with bits corresponding to layer A from the decoded bit stream, and sends it to the byte deinterleaving unit 528-a. input. Also, the second layer division unit 527, for example, constructs a bit stream of bits corresponding to the B layer from the decoded bit stream, and inputs the bit stream to the byte deinterleave processing unit 528-b. Then, the second layer division unit 527, for example, constructs a bit stream of bits corresponding to the C layer out of the decoded bit stream, and inputs the bit stream to the byte deinterleave processing unit 528-c.

The byte deinterleave processing units 528-a to 528-c convert input bit-wise data (bitstream) into byte-wise data. Then, the byte deinterleaving processing units 528-a to 528-c perform byte deinterleaving processing for resetting the delay amount set by the convolutional byte interleaving processing in the byte interleaving processing units 267-a to 267-c, for example. applied to the data.

The energy despreading processing units 529-a to 529-c convert the byte-unit data that has undergone byte deinterleaving processing by the byte de-interleaving processing units 528-a to 528-c into a bit-unit bit stream, and convert the converted bits Apply energy despreading to the stream. Specifically, the energy despreading processing units 529-a to 529-c, for example, use the bit stream excluding the synchronization bytes of the TS packets in the bit stream, and the energy spreading units 264-a to 264-c to A bit-by-bit exclusive OR is calculated with a predetermined PRBS. Then, the energy despreading processing units 529-a to 529-c input the respective calculation result data to the TS reproduction processing unit 530 as the results of the energy despreading processing.

The TS reproduction processing unit 530 converts the TMCC information input by the TMCC signal decoding units 516-a and 516-b (which may be either one of the TMCC signal decoding unit 516-a and the TMCC signal decoding unit 516-b) into By referring to the synchronization bytes of the TS based on the data, the input data are multiplexed and divided into TS packets, thereby reproducing the same TS frame structure as that of the transmitting side.

The outer code decoding unit 531 detects errors in the TS packets of the TS frame structure reproduced by the TS reproduction processing unit 530 based on the predetermined check codes added by the outer code processing units 261-a and 262-b. A decoding process for detection and correction is performed to generate a TS packet.

The TS packets generated by the outer code decoding unit 531 are converted into video signals by the decoding unit 440, and video is reproduced by a video display device or the like.

Note that the reception signal received by the horizontally polarized antenna 601 is also input to the receiving section 300 via the distributor 700 . Then, the receiving unit 300 causes the television receiver to reproduce an image corresponding to the input reception signal based on, for example, the transmission system of the current terrestrial digital television broadcasting.

Therefore, an image based on the 4K signal is reproduced on the image display device or the like connected to the receiving unit 400 in the first embodiment of the present invention. In addition, on the television receiver connected to the receiving unit 300, video based on the current transmission system of digital terrestrial television broadcasting is reproduced according to the 2K signal. Therefore, the broadcasting system 100 of the first embodiment of the present invention can coexist with the current terrestrial digital television broadcasting system.

Next, operation of the transmission section 200 according to the first embodiment of the present invention will be described. FIG. 10 is a flow chart showing the operation of the modulating section 230 according to the first embodiment of the present invention.

First, the 1seg signal, the 2K signal, and the 4K signal are input to the modulation unit 230 (step S101).

Each unit of the modulating unit 230 synthesizes the inputted one-seg signal, 2K signal, and 4K signal, and performs transmission line coding processing (step S102). For example, the OFDM frame construction section 275 constructs an OFDM frame, which will be described later.

The modulation unit 230 generates a first OFDM signal for electromagnetic waves transmitted by the horizontally polarized antenna 501 and a second OFDM signal for electromagnetic waves transmitted by the vertically polarized antenna 502 (step S103).

The modulation section 230 inputs the generated first OFDM signal to the first amplification section 240 . Also, the modulation section 230 inputs the generated second OFDM signal to the second amplification section 250 . The first amplification unit 240 amplifies the first OFDM signal input by the modulation unit 230 with a predetermined amplification factor (step S104). Then, first amplification section 240 inputs the amplified first OFDM signal to antenna 501 . The first OFDM signal amplified by the first amplifier 240 is converted into an electromagnetic wave by the antenna 501 and radiated as a horizontally polarized wave.

The second amplification unit 250 amplifies the second OFDM signal input by the modulation unit 230 with a predetermined amplification factor (step S104). Second amplifier 250 then inputs the amplified second OFDM signal to antenna 502 . The second OFDM signal amplified by the second amplifier 250 is converted into an electromagnetic wave by the antenna 502 and radiated as a vertically polarized wave.

According to the present embodiment, the modulation unit 230 of the transmission unit 200 generates two types of OFDM transmission signals that can be transmitted with mutually different planes of polarization based on the input 2K signal and 4K signal. . Then, the demodulator 430 of the receiver 400 demodulates the received signal based on the OFDM transmission signal generated and transmitted by the transmitter 200, and the TS packet that can be converted into a 2K signal and a 4K signal by the decoder 440 to generate

Therefore, on the receiving side, using the electromagnetic waves used for the transmission of the current terrestrial digital television broadcasting and the electromagnetic waves with a polarization plane different from the polarization plane of the electromagnetic waves, the video corresponding to the 1seg signal and the 2K signal Data can be transmitted so as to enable playback of at least one of the corresponding video and the video corresponding to the 4K signal.

In addition, when the polarization plane of the electromagnetic wave corresponding to the 2K signal is set to be the same as the polarization plane of the electromagnetic wave used for the transmission of the current terrestrial digital television broadcasting, the receiving side can It is possible to newly reproduce a video corresponding to the 4K signal while continuing the state in which the John broadcast can be received and the video can be reproduced.

In the example described above, 10 segments (5 for horizontal polarization and 5 for vertical polarization for a total of 10 segments) are used by the B layer where data according to the 4K signal is transmitted and received. explained as However, another number of segments such as 8 (4 for horizontal polarization and 4 for vertical polarization for a total of 8) may be used depending on the B layer where data corresponding to the 4K signal is transmitted and received. may be configured to

FIG. 11 is an explanatory diagram showing an example of parameters according to the number of segments used by layer B and the modulation scheme of the 4K signal.

In the example shown in FIG. 11, the 2K column shows values corresponding to the current terrestrial digital television broadcasting. The 4K column shows the TS rate for each modulation scheme when four segments are used and when five segments are used in each of the B layer and the C layer.

As shown in FIG. 11, the larger the number of levels in the 4K modulation scheme, the larger the value of the TS rate. Also, as shown in FIG. 11, the greater the number of segments used for data transmission according to the 4K signal, the greater the TS rate value for data transmission according to the 4K signal. . Similarly, as shown in FIG. 11, the greater the number of segments used for the transmission of data according to the 2K signal, the higher the TS rate value for the transmission of data according to the 2K signal. Become.

Next, the OFDM frame constructed by the OFDM frame constructing section 275 will be described in detail with reference to the drawings.

FIG. 12 shows a boundary between an OFDM segment configuration corresponding to a 2K signal (hereinafter also referred to as a 2K OFDM segment configuration) and an OFDM segment configuration corresponding to a 4K signal (hereinafter also referred to as a 4K OFDM segment configuration). 1 shows an example of an OFDM segment structure including portions.

The 2K OFDM segment configuration shown in FIG. 12 is composed of, for example, 432 carriers and 204 OFDM symbols. Also, the 4K OFDM segment configuration shown in FIG. 12 is composed of, for example, 432 carriers and 204 OFDM symbols. An OFDM symbol is hereinafter also referred to as a symbol.

In addition, in FIG. 12, locations where null carriers are inserted are indicated by "x". In FIG. 12, the locations where pilot signals are inserted are indicated by "1". In the OFDM segment configuration for 2K shown in FIG. 12, the portion where the signal for 2K is inserted is indicated by "D". In the OFDM segment configuration for 4K shown in FIG. 12, the portion where the signal for 4K is inserted is indicated by "D". Also, in FIG. 12, a portion where an AC signal or a TMCC signal or the like is inserted is also indicated by "D". That is, locations other than locations where pilot signals or null carriers are inserted are locations where 2K signals, 4K signals, AC signals, TMCC signals, or the like are inserted and transmitted.

As shown in FIG. 12, in the 2K OFDM segment configuration, pilot signals are inserted at predetermined intervals according to the current terrestrial digital television broadcasting transmission system.

Specifically, for example, in the OFDM segment configuration for 2K, a pilot signal is inserted once in 12 carriers in the carrier direction and once in 4 symbols in the symbol direction and transmitted.

Further, as shown in FIG. 12, pilot signals are inserted at predetermined intervals in the 4K OFDM segment configuration on the horizontal polarization side and the vertical polarization side.

Specifically, for example, in the OFDM segment configuration for 4K, a pilot signal is inserted once in 24 carriers in the carrier direction and once in 8 symbols in the symbol direction and transmitted.

Further, as shown in FIG. 12, NULL carriers are inserted at predetermined intervals in the 4K OFDM segment configuration on the horizontal polarization side and the vertical polarization side. It should be noted that, for example, no signal is transmitted at locations where null carriers are inserted. A null carrier is also referred to as a null pilot signal.

Specifically, for example, in the OFDM segment configuration for 4K, a null carrier is inserted once every 24 carriers in the carrier direction and once every 8 symbols in the symbol direction.

In addition, as shown in FIG. 12, at a location in the 4K OFDM segment configuration on the vertical polarization side corresponding to the location where the pilot signal is inserted in the 4K OFDM segment configuration on the horizontal polarization side, A null carrier is inserted.

Specifically, for example, in the 4K OFDM segment configuration on the horizontal polarization side, a pilot signal is inserted where the carrier number is 0 and the OFDM symbol number is 0, and the 4K OFDM segment configuration on the vertical polarization side , a null carrier is inserted where the carrier number is 0 and the OFDM symbol number is 0. Note that the OFDM symbol number is hereinafter also referred to as the symbol number.

Further, as shown in FIG. 12, in the 4K OFDM segment configuration on the vertical polarization side corresponding to the location where the null carrier is inserted in the 4K OFDM segment configuration on the horizontal polarization side, A pilot signal is inserted.

Specifically, for example, in the 4K OFDM segment configuration on the horizontal polarization side, a null carrier is inserted where the carrier number is 3 and the symbol number is 1, and in the 4K OFDM segment configuration on the vertical polarization side , where the carrier number is 3 and the symbol number is 1, a pilot signal is inserted.

The receiving unit 300 estimates the transmission path characteristics based on the pilot signal and performs equalization processing on the received signal according to the transmission system of the current digital terrestrial television broadcasting. Specifically, for example, receiving section 300, based on the transmitted pilot signal and the known pilot signal, phase information (for example, according to the phase difference between the transmitted pilot signal and the known pilot signal ), and estimates the channel characteristics based on the phase information. Then, the receiving unit 300 performs equalization processing on the received signal based on the estimation result of the transmission path characteristics.

Here, for example, when the TMCC information indicates that the signal in the B layer is differentially modulated, the reception unit 300 can be used even in the 4K OFDM segment configuration on the horizontal polarization side as in the current terrestrial Equalization processing is performed on the 2K signal on the premise that a pilot signal is inserted according to the transmission system of digital television broadcasting.

Specifically, for example, receiving section 300 assumes that a pilot signal is inserted in the first carrier (that is, the carrier with carrier number 0) in the 4K OFDM segment configuration on the horizontal polarization side, Equalization processing or the like is applied to the 2K signal.

However, in the 4K OFDM segment configuration on the horizontal polarization side, which is set according to a transmission method different from the current transmission method of digital terrestrial television broadcasting, as shown in FIG. When a null carrier is inserted, the receiving section 300 may not be able to properly equalize the received signal. For this reason, there is a possibility that the MER (Modulation Error Ratio) of the carrier in the portion where the B layer and the C layer are in contact with each other deteriorates, and the BER (Bit Error Rate) deteriorates.

Therefore, in the OFDM segment configuration for 4K on the horizontal polarization side, the OFDM frame configuration section 275 of the present embodiment appropriately converts the pilot signal into a configured to be inserted into position.

FIG. 13 shows an example of an OFDM segment configuration configured by the OFDM frame configuration unit 275, and shows an example of an OFDM segment configuration including a portion that touches the boundary between the 2K OFDM segment configuration and the 4K OFDM segment configuration. there is

The OFDM segment configuration for 2K shown in FIG. 13 is composed of, for example, 432 carriers and 204 symbols. Also, the 4K OFDM segment configuration shown in FIG. 13 is composed of, for example, 432 carriers and 204 symbols.

Note that in FIG. 13, locations where null carriers are inserted are indicated by "x". In FIG. 13, the locations where pilot signals are inserted are indicated by "1". In the OFDM segment configuration for 2K shown in FIG. 13, the portion where the signal for 2K is inserted is indicated by "D". In the OFDM segment configuration for 4K shown in FIG. 13, the portion where the signal for 4K is inserted is indicated by "D". Also, in FIG. 13, a portion where an AC signal or a TMCC signal or the like is inserted is also indicated by "D". That is, locations other than locations where pilot signals or null carriers are inserted are locations where 2K signals, 4K signals, AC signals, TMCC signals, or the like are inserted and transmitted.

As shown in FIG. 13, OFDM frame configuration section 275 specifies pilot signals and null carriers for the 2K OFDM segment configuration and the 4K OFDM segment configuration, similar to the OFDM segment configuration shown in FIG. inserted at intervals of Receiving section 400 estimates transmission path characteristics based on the pilot signal inserted in the 4K OFDM segment configuration, and performs equalization processing on the received signal. Specifically, for example, receiving section 400, based on the inserted pilot signal and the known pilot signal, phase information (for example, A value corresponding to the phase difference) is obtained, and transmission path characteristics are estimated based on the phase information. Then, the receiving unit 400 performs equalization processing on the received signal based on the estimation result of the transmission path characteristics.

The second image quality reproduction data is, for example, data corresponding to the 2K signal included in the 2K OFDM segment configuration on the horizontal polarization side, pilot signal data, TMCC signal data, and AC signal data. Corresponds to data.

In addition, the data for one polarization antenna transmission is, for example, data corresponding to the 2K signal included in the 2K OFDM segment configuration and the 4K OFDM segment configuration on the horizontal polarization side, data corresponding to the 4K signal data, pilot signal data, TMCC signal data, and AC signal data.

In addition, the data for the other polarization antenna transmission is, for example, data according to the 4K signal included in the 4K OFDM segment configuration on the vertical polarization side, pilot signal data, TMCC signal data, and AC signal equivalent to data for

Specifically, for example, in the OFDM segment configuration for 2K, OFDM frame configuration section 275 inserts a pilot signal and a null carrier once every 12 carriers in the carrier direction. That is, pilot signals and null carriers are inserted every 12 carriers. Therefore, pilot signals and null carriers are inserted at 11 carrier intervals. Also, specifically, for example, in the OFDM segment configuration for 2K, OFDM frame configuration section 275 inserts a pilot signal and a null carrier once every four symbols in the symbol direction. That is, pilot signals and null carriers are inserted every four symbols. Therefore, pilot signals and null carriers are inserted at 3-symbol intervals.

Also, as shown in FIG. 13, the OFDM frame configuration unit 275, similarly to the OFDM segment configuration shown in FIG. A pilot signal and a null carrier are inserted at predetermined intervals.

Specifically, for example, in the OFDM segment configuration for 4K, OFDM frame configuration section 275 inserts a pilot signal and a null carrier once every 24 carriers in the carrier direction. That is, pilot signals and null carriers are inserted every 24 carriers. Therefore, pilot signals and null carriers are inserted at intervals of 23 carriers. Also, specifically, for example, in the OFDM segment configuration for 4K, OFDM frame configuration section 275 inserts a pilot signal and a null carrier once every eight symbols in the symbol direction. That is, pilot signals and null carriers are inserted every eight symbols. Therefore, pilot signals and null carriers are inserted at 7-symbol intervals.

As shown in FIG. 13, OFDM frame configuration section 275, similarly to the OFDM segment configuration shown in FIG. A null carrier is inserted at a location in the OFDM segment configuration for 4K on the vertical polarization side corresponding to .

Specifically, for example, the OFDM frame configuration unit 275 inserts a pilot signal into a location where the carrier number is 0 and the symbol number is 0 in the 4K OFDM segment configuration on the horizontal polarization side, and In the OFDM segment configuration for 4K, a null carrier is inserted where the carrier number is 0 and the symbol number is 0.

Also, as shown in FIG. 13, the OFDM frame configuration unit 275 inserts a null carrier in the 4K OFDM segment configuration on the horizontal polarization side, similar to the OFDM segment configuration shown in FIG. A pilot signal is inserted at a location in the OFDM segment configuration for 4K on the vertically polarized wave side corresponding to the location where the pilot signal is present.

Specifically, for example, the OFDM frame configuration unit 275 inserts a null carrier at a position where the carrier number is 3 and the symbol number is 1 in the 4K OFDM segment configuration on the horizontal polarization side. In the OFDM segment configuration for 4K, a pilot signal is inserted where the carrier number is 3 and the symbol number is 1.

By configuring in this way, it is possible to reduce the possibility that the signal transmitted from the antenna for horizontal polarization and the signal transmitted from the antenna for vertical polarization interfere with each other.

Further, as shown in FIG. 13, OFDM frame configuration section 275 inserts a pilot signal into the first carrier (that is, the carrier with carrier number 0) in the 4K OFDM segment configuration on the horizontal polarization side. .

As shown in FIG. 13, OFDM frame configuration section 275 inserts a null carrier into the first carrier (that is, the carrier with carrier number 0) in the 4K OFDM segment configuration on the vertically polarized wave side.

In the OFDM segment configuration for 2K shown in FIG. 13, the symbols with symbol numbers 8 to 15 have the same signal arrangement as the symbols with symbol numbers 0 to 7. FIG. That is, in the OFDM segment configuration for 2K, the same signal arrangement as the signal arrangement in symbols with symbol numbers 0 to 7 is repeated.

Further, in the 4K OFDM segment configuration on the horizontal polarization side shown in FIG. 13, the symbols with symbol numbers 8 to 15 have the same signal arrangement as the symbols with symbol numbers 0 to 7. ing. That is, in the 4K OFDM segment configuration on the horizontal polarization side, the same signal arrangement as the signal arrangement in symbols with symbol numbers 0 to 7 is repeated.

Also, in the 4K OFDM segment configuration on the vertical polarization side shown in FIG. 13, the symbols with symbol numbers 8 to 15 have the same signal arrangement as the symbols with symbol numbers 0 to 7. ing. That is, in the 4K OFDM segment configuration on the vertically polarized wave side, the same signal arrangement as that of the symbols with symbol numbers 0 to 7 is repeated.

In the case of the OFDM segment configuration shown in FIG. 13, receiving section 300 equalizes the signal for 2K based on the pilot signal inserted in the first carrier in the OFDM segment configuration for 4K on the horizontal polarization side. can be treated. That is, deterioration of carrier MER and degradation of BER in the portion in contact with the boundary between the B layer and the C layer are suppressed. As a result, the receiving unit 300 can cause the television receiver to reproduce the video corresponding to the input received signal, for example, based on the transmission system of the current terrestrial digital television broadcasting. Therefore, even if the new terrestrial broadcasting and the current terrestrial digital television broadcasting coexist, a television that can reproduce images according to the received signal input based on the current terrestrial digital television broadcasting transmission system. The receiver can properly reproduce the video.

Note that the insertion intervals of pilot signals and null carriers in the 4K OFDM segment configuration are not limited to the example shown in FIG. For example, the OFDM frame may be configured to have a wider interval than the insertion intervals of the pilot signals and null carriers shown in FIG. The OFDM frame may be configured such that the interval is narrower than the insertion interval.

Specifically, for example, an OFDM frame may be configured such that a pilot signal is inserted once in 48 carriers in the carrier direction and once in 6 symbols in the symbol direction. That is, for example, the OFDM frame may be configured such that a pilot signal is inserted every 48 carriers and a pilot signal is inserted every 6 symbols.

Also, in the OFDM segment configuration shown in FIG. 13, pilot signals were inserted across all symbols in the first carrier in the 4K OFDM segment configuration on the horizontal polarization side, but in the 2K OFDM segment configuration A frame may be configured such that pilot signals are inserted only at positions corresponding to the insertion intervals of the pilot signals.

Specifically, for example, the OFDM frame configuration unit 275 inserts a pilot signal at a location where the carrier number is 0 and the symbol number is 4 in the 4K OFDM segment configuration on the horizontal polarization side, In the OFDM segment configuration for 4K, a null carrier may be inserted at a position where the carrier number is 0 and the symbol number is 4.

Further, when the pilot signal and the null carrier are inserted as described above, the OFDM frame configuration section 275 inserts the pilot signal and the null carrier in the 4K OFDM segment configuration on the horizontal polarization side and the vertical polarization side. At locations other than the inserted location, the OFDM frame may be configured so that the 4K signal is transmitted. Specifically, for example, the OFDM frame configuration unit 275 configures the OFDM frame so that the 4K signal is transmitted to the locations where the carrier number is 0 and the symbol numbers are 1 to 3 and 5 to 7. may be configured to

By configuring in this way, the data rate in the B layer can be improved.

Further, OFDM frame configuration section 275 is configured to insert pilot signals and null carriers also in the portion of layer B that contacts the boundary with layer A, as in the OFDM segment configuration shown in FIG. good too. Specifically, for example, the OFDM frame configuration unit 275, in the portion that touches the boundary between the OFDM segment configuration corresponding to the One Seg signal and the 4K OFDM segment configuration, the head of the 4K OFDM segment configuration on the horizontal polarization side. , and a null carrier in the first carrier in the 4K OFDM segment configuration on the vertical polarization side.

Further, OFDM frame configuration section 275 may be configured to insert a pilot signal also into the last carrier (that is, the carrier with carrier number 432) in the 4K OFDM segment configuration on the horizontal polarization side. . In this case, the OFDM frame configuration unit 275 inserts a null carrier into the trailing carrier in the 4K OFDM segment configuration on the vertical polarization side. Specifically, for example, OFDM frame configuration section 275 may be configured to insert a pilot signal over all symbols in the trailing carrier in the 4K OFDM segment configuration on the horizontal polarization side.

By configuring in this way, for example, when the reception unit 400 can apply equalization processing to the received signal using the pilot signal inserted in the last carrier, the estimation accuracy of the transmission path characteristics can be improved. can be improved.

In the above example, one is horizontally polarized and the other is vertically polarized, but one may be vertically polarized and the other horizontally.

Also, in this example, the one-segment signal, the 2K signal, and the 4K signal are all described as TS, but other formats such as signals corresponding to MMT (MPEG Media Transport) format packets It may be a signal.

In this example, the receiving unit 300 and the receiving unit 400 are configured to share the horizontally polarized antenna 601, but separate antennas are connected to the receiving unit 300 and the receiving unit 400, respectively. It may be configured as

Embodiment 2.
A broadcasting system according to a second embodiment of the present invention will be described with reference to the drawings. FIG. 14 is a block diagram showing a configuration example of the broadcasting system 101 according to the second embodiment of the present invention.

Broadcasting system 101 differs from broadcasting system 100 of the first embodiment in that transmitting unit 201 inserts TMCC signals and AC signals into predetermined locations in the OFDM segment configuration, and receiving unit 401 is based on a predetermined pilot signal. The difference is that equalization processing is applied to the received signal. Since other components are the same as those in the first embodiment shown in FIG. 1 etc., the same reference numerals as the corresponding components in the first embodiment shown in FIG. , and the description is omitted.

As shown in FIG. 14, a broadcasting system (broadcast transmission/reception system) 101 according to the second embodiment of the present invention includes a transmission section 201, a reception section (broadcast reception system) 300, a reception section (broadcast reception system ) 401. Note that the broadcasting system (broadcast transmission/reception system) 101 may be configured to include, for example, a transmission section 201 and a reception section (broadcast reception system) 300 or a reception section (broadcast reception system) 401. .

The transmitting unit 201, the receiving unit 300, and the receiving unit 401 may be implemented by a computer equipped with one or more circuits such as a CPU that executes processing according to program control, for example. Specifically, for example, the transmitting unit 201, the receiving unit 300, and the receiving unit 401 are loaded with software for realizing each operation described below. The transmitting unit 201, the receiving unit 300, and the receiving unit 401 may be configured to realize each operation described below by executing processing according to program control of the software.

Next, the configuration of transmission section 201 will be described with reference to the drawings. As shown in FIG. 14, the transmitting unit 201 in the second embodiment of the present invention includes an encoding unit 210, a multiplexing unit 220, a modulation unit (eg, data structuring means) 231, a first amplification unit 240, and A second amplifier 250 is included.

The transmission processing means corresponds to, for example, the first amplification section 240 and the second amplification section 250 in the second embodiment of the present invention. The broadcasting transmission system corresponds to the broadcasting transmission system 251 shown in FIG. 14, for example. The broadcasting transmission system 251 includes, for example, the modulation section 231, the first amplification section 240 and the second amplification section 250 according to the second embodiment of the present invention. Note that the broadcast transmission system includes, for example, the encoding unit 210, the multiplexing unit 220, the modulation unit 231, the first amplification unit 240, and the second amplification unit 250 in the second embodiment of the present invention. may be configured.

The modulation unit 231 performs channel coding processing on the input One-Seg signal, 2K signal, and 4K signal to generate a first OFDM signal and a second OFDM signal.

The modulation section 231 inputs the generated first OFDM signal to the first amplification section 240 . Also, the modulation section 231 inputs the generated second OFDM signal to the second amplification section 250 .

Next, the configuration of the receiving section 401 will be described with reference to the drawings. As shown in FIG. 14, the receiving unit 401 in the second embodiment of the present invention includes a first receiving processing unit (receiving means) 410, a second receiving processing unit 420, a demodulating unit (equalizing means) 431, and a decoding unit (playback processing means) 440 .

Demodulator 431 demodulates the input received signal in accordance with the channel coding process performed by modulator 231 of transmitter 201 on the One Seg signal, 2K signal, and 4K signal, and converts the received signal into TS. Generate a signal. Demodulator 431 then inputs the generated TS signal to decoder 440 . Note that demodulation processing in the demodulation unit 431 is performed by each unit in the demodulation unit 431 to be described later.

Next, transmission line coding processing performed by the modulation unit 231 will be described. 15 to 17 are block diagrams showing configuration examples of the modulation section 231 according to the second embodiment of the present invention. As shown in FIGS. 15 to 17, the modulation unit 231 in the second embodiment of the present invention includes an outer code processing unit 261-a, a frame configuration unit 261-b, a layer dividing unit 262-a, an outer code processing unit 262 -b, first byte-bit converters 263-a to 263-c, energy spreaders 264-a to 264-c, delay correctors 265-a to 265-c, bit-byte converters 266-a to 266-c, byte interleaving processor 267 -a to c, second byte-bit conversion units 268-a to c, convolutional encoding processing units 269-a to c, bit interleaving processing units 270-a to c, mapping processing units 271-a to c, hierarchy Combining unit 272, time interleave processing unit 273, frequency interleave processing unit 274, OFDM frame configuration unit (for example, data configuration means) 280, normalization unit 276-a, b, IFFT processing unit 277-a, b, guard interval addition It includes processing units 278-a, b and quadrature modulation processing units 279-a, b. Components other than the OFDM frame configuration unit 280 are the same as those in the first embodiment shown in FIGS. , the same reference numerals as those of the corresponding components are attached, and the description thereof is omitted.

OFDM frame construction section 280 receives as input the signal subjected to frequency interleaving processing by frequency interleaving processing section 274, the pilot signal, the TMCC signal, and the AC signal.

Then, the OFDM frame constructing section 280 constructs an OFDM frame based on each input signal. Specifically, OFDM frame configuration section 280, for example, for each symbol in each OFDM carrier, the value of each signal (one segment signal, 2K signal, 4K signal, pilot signal, TMCC signal, and AC signal) set. Further, the OFDM frame construction section 280 inserts null carriers at predetermined locations in the OFDM frame. The details of the insertion point of the null carrier will be described later.

Note that the OFDM frame configuration unit 280 configures, for example, an OFDM frame for horizontal polarization and an OFDM frame for vertical polarization. Specifically, the OFDM frame configuration unit 280, for example, a signal corresponding to a segment according to the 1Seg signal, a signal corresponding to a segment according to the 2K signal, and 10 segments according to the 4K signal An OFDM frame for horizontal polarization is configured according to signals corresponding to five segments among them, a pilot signal, a TMCC signal, and an AC signal. Further, OFDM frame configuration section 280, for example, according to the signals corresponding to the remaining five segments of the ten segments corresponding to the 4K signal, the pilot signal, the TMCC signal, and the AC signal, Construct an OFDM frame for vertical polarization. In addition, even if each pilot signal is configured to transmit a broadcast wave by polarization MIMO to the B layer as in this example, the broadcast wave in the C layer can be appropriately received. It is inserted at the position in the set frequency domain. Details of the OFDM frame configured by the OFDM frame configuration section 280 and specific insertion positions of the pilot signal, TMCC signal, and AC signal will be described later. Hereinafter, the OFDM frame configured by the OFDM frame configuration section 280 is also referred to as an OFDM segment configuration.

Further, OFDM frame construction section 280 transmits to reception section 300 a TMCC signal indicating that the signal in layer B is differentially modulated and the signal in layer C is synchronously modulated. It may be configured to form an OFDM frame.

Note that when the TMCC information indicates that the signal in layer B is differentially modulated and the signal in layer C is synchronously modulated, receiving section 300 performs frequency deinterleaving processing using B Segments according to hierarchy and segments according to C hierarchy are processed separately. By performing such processing, it is possible to prevent segments corresponding to the B layer and segments corresponding to the C layer from being mixed as a result of frequency deinterleaving.

Then, the OFDM frame construction unit 280 inputs, for example, an OFDM frame for horizontal polarization to the normalization unit 276-a. The OFDM frame construction unit 280 also inputs, for example, an OFDM frame for vertical polarization to the normalization unit 276-b.

Next, the configuration of demodulator 431 will be described with reference to the drawing. 18 to 21 are block diagrams showing the configuration of the demodulator 431 according to the second embodiment of the present invention.

As shown in FIGS. 18 to 21, the demodulator 431 in the second embodiment of the present invention includes AD converters 511-a and 511-b, quadrature demodulators 512-a and 512-b, and synchronous reproducers 513-a. , b, FFT processing units 514-a, b, frame extraction units 515-a, b, TMCC signal decoding units 516-a, b, AC signal decoding units 517-a, b, carrier demodulation unit 532, frequency deinterleave processing Unit 519, time deinterleaving processing unit 520, first layer dividing unit 521, demapping processing units 522-a to 522-c, bit deinterleaving processing units 523-a to 523-c, depuncture processing units 524-a to 524-c, layer synthesis unit 525, inner code decoding unit 526, second hierarchical division unit 527, byte deinterleaving processing units 528-a to c, energy despreading processing units 529-a to c, TS playback processing unit 530, and outer code decoding unit 531. Components other than the carrier demodulation unit 532 are the same as those in the first embodiment shown in FIGS. The same reference numerals as those of the corresponding constituent elements are attached, and the description thereof is omitted.

The frequency-domain signals transformed by the FFT processing units 514-a and 514-b are input to the carrier demodulation unit 532, respectively. Therefore, the carrier demodulation unit 532 uses the TMCC information input by the TMCC signal decoding units 516-a and 516-b (either one of the TMCC signal decoding unit 516-a and the TMCC signal decoding unit 516-b may be used). , FFT processing units 514-a and 514-b perform differential demodulation processing, synchronous demodulation processing, equalization processing, and the like on the input frequency domain signals. Specifically, the carrier demodulation unit 532 identifies each carrier constituting the OFDM signal based on the OFDM segment in the frequency domain signal input by the FFT processing units 514-a and 514-b, and calculates the amplitude of each carrier. and phase information indicating the phase of each carrier. Then, the carrier demodulation unit 532 inputs the frequency domain signals transformed by the FFT processing units 514 - a and 514 -b, amplitude information, and phase information to the frequency deinterleaving processing unit 519 .

Further, for example, the carrier demodulation unit 532 extracts a pilot signal from the signals input from the FFT processing units 514-a and 514-b, estimates transmission channel characteristics based on the pilot signals, and estimates the transmission channel characteristics. Using the results, equalization processing is applied to the signals input from the FFT processing units 514-a and 514-b.

According to the present embodiment, the modulation unit 231 of the transmission unit 201 generates two types of OFDM transmission signals that can be transmitted with mutually different polarization planes based on the input 2K signal and 4K signal. . Then, the demodulator 431 of the receiver 401 demodulates the received signal based on the OFDM transmission signal generated and transmitted by the transmitter 200, and the TS packet that can be converted into a 2K signal and a 4K signal by the decoder 440. to generate

Therefore, on the receiving side, using the electromagnetic waves used for the transmission of the current terrestrial digital television broadcasting and the electromagnetic waves with a polarization plane different from the polarization plane of the electromagnetic waves, the video corresponding to the 1seg signal and the 2K signal Data can be transmitted so as to enable playback of at least one of the corresponding video and the video corresponding to the 4K signal.

In addition, when the polarization plane of the electromagnetic wave corresponding to the 2K signal is set to be the same as the polarization plane of the electromagnetic wave used for the transmission of the current terrestrial digital television broadcasting, the receiving side can It is possible to newly reproduce a video corresponding to the 4K signal while continuing the state in which the John broadcast can be received and the video can be reproduced.

Next, the OFDM segment configuration configured by OFDM frame configuration section 280 will be described in detail with reference to the drawings.

Receiving section 300 may determine the reception quality using MER measured based on the AC signal and the TMCC signal, or display the determined reception quality. Further, the reception unit 300 may determine whether or not to cause the television receiver to reproduce video based on the 2K signal based on the determined reception quality.

Specifically, for example, electromagnetic waves radiated via the antennas 501 and 502 and received by the antenna 601 are converted into reception signals and input to the reception processing unit (receiving means) of the reception unit 300 .

Next, the demodulator (determining means) of the receiver 300 measures the MER based on, for example, the AC signal and the TMCC signal, and determines the reception quality using the MER.

Then, when the demodulator (determining means) of the receiving section 300 determines that the reception quality is lower than the predetermined threshold, the decoding section (reproduction processing means) of the receiving section 300 transmits the 2K signal to the television receiver. Do not play video based on Further, for example, when the demodulation unit of the reception unit 300 determines that the reception quality is higher than a predetermined threshold, the decoding unit (reproduction processing means) of the reception unit 300 is based on the 2K signal for the television receiver. play the video.

Here, for example, when the TMCC information indicates that the signal in the B layer is differentially modulated, the reception unit 300 can be used even in the 4K OFDM segment configuration on the horizontal polarization side as in the current terrestrial The reception quality is determined on the assumption that the AC signal and the TMCC signal are inserted according to the digital television broadcasting transmission system.

However, in the OFDM segment configuration for 4K on the horizontal polarization side, which is set according to a transmission method different from the transmission method of the current digital terrestrial television broadcasting, AC Signals or TMCC signals may not be inserted.

Therefore, receiving section 300 cannot correctly determine reception quality, and may erroneously determine that reception quality is lower than a predetermined threshold. If the receiving unit 300 erroneously determines that the reception quality is lower than the predetermined threshold, there is a possibility that the video based on the 2K signal will not be reproduced on the television receiver.

Therefore, the OFDM frame configuration unit 280 of the present embodiment is configured to insert the AC signal and the TMCC signal even in the 4K OFDM segment configuration on the horizontal polarization side according to the current terrestrial digital television broadcasting transmission system. ing.

Specifically, for example, the OFDM frame constructing unit 280 is configured to insert an AC signal at a carrier number of 30 and a TMCC signal at a carrier number of 51 .

22 and 23 show an example of a 4K OFDM segment configuration configured by the OFDM frame configuration section 280. FIG. Note that the 4K OFDM segment configuration shown in FIGS. 5.

In addition, in FIGS. 22 and 23, locations where null carriers are inserted are indicated by "x". In FIGS. 22 and 23, locations where pilot signals are inserted are indicated by "1". In FIGS. 22 and 23, the portion where the 4K signal is inserted is indicated by "D". In FIGS. 22 and 23, the portion where the AC signal is inserted only in the differential segment is indicated by "AC2". In FIGS. 22 and 23, the portion where the TMCC signal is inserted is indicated by "TMCC". The first image quality reproduction data is, for example, data corresponding to the 4K signal included in the 4K OFDM segment configuration on the horizontal polarization side, pilot signal data, TMCC signal data, and AC signal data. Corresponds to data.

In the horizontal polarization side 4K OFDM segment configuration shown in FIGS. 22 and 23, the symbols with symbol numbers 8 to 15 have the same signal arrangement as the symbols with symbol numbers 0 to 7. is done. That is, in the 4K OFDM segment configuration on the horizontal polarization side, the same signal arrangement as the signal arrangement in symbols with symbol numbers 0 to 7 is repeated.

In the vertically polarized 4K OFDM segment configurations shown in FIGS. 22 and 23, the symbols with symbol numbers 8 to 15 have the same signal arrangement as the symbols with symbol numbers 0 to 7. is done. That is, in the 4K OFDM segment configuration on the vertically polarized wave side, the same signal arrangement as that of the symbols with symbol numbers 0 to 7 is repeated.

As shown in FIG. 12, the OFDM segments are configured such that the 2K OFDM segment configuration is adjacent to the 4K OFDM segment configuration on the horizontal polarization side shown in FIGS. good too.

As shown in FIGS. 22 and 23, OFDM frame configuration section 280 inserts pilot signals and null carriers into the 4K OFDM segment configuration at predetermined intervals, as in the first embodiment of the present invention. .

Further, as shown in FIGS. 22 and 23, the OFDM frame configuration unit 280, similarly to the first embodiment of the present invention, is the first carrier in the 4K OFDM segment configuration on the horizontal polarization side (that is, A pilot signal is inserted into the carrier with carrier number 0), and a null carrier is inserted into the first carrier (that is, the carrier with carrier number 0) in the OFDM segment configuration for 4K on the vertically polarized wave side. The carrier with the lowest frequency corresponds to, for example, the carrier with carrier number 0 in the 4K OFDM segment configuration on the horizontal polarization side shown in FIGS.

Furthermore, the OFDM frame configuration section 280 inserts the AC signal and the TMCC signal at predetermined locations in the 4K OFDM segment configuration.

Specifically, for example, as shown in FIGS. 22 and 23, the OFDM frame configuration unit 280 generates AC signals at carrier numbers 10 and 30 in the 4K OFDM segment configuration on the horizontal polarization side. insert.

More specifically, for example, as shown in FIGS. 22 and 23, the OFDM frame configuration unit 280 adds nulls at carrier numbers 10 and 30 in the 4K OFDM segment configuration on the vertical polarization side. Insert carrier.

Further, for example, as shown in FIGS. 22 and 23, the OFDM frame configuration unit 280 inserts TMCC signals into locations with carrier numbers 23, 37, and 51 in the 4K OFDM segment configuration on the horizontal polarization side. do.

Further, specifically, for example, as shown in FIGS. 22 and 23, the OFDM frame configuration unit 280 constructs the OFDM segment configuration for 4K on the vertically polarized wave side where the carrier numbers are 23, 37, and 51. Insert a null carrier in

By configuring in this way, it is possible to reduce the possibility that the signal transmitted from the antenna for horizontal polarization and the signal transmitted from the antenna for vertical polarization interfere with each other.

According to the 4K OFDM segment configuration described above, the receiving section 300 can determine reception quality using the AC signal and TMCC signal inserted in the 4K OFDM segment configuration on the horizontal polarization side. In other words, it is possible to suppress the possibility that the receiving section 300 erroneously determines that the reception quality is lower than the predetermined threshold. As a result, the receiving unit 300 transmits the image corresponding to the input reception signal to the television receiver (the image corresponding to the data for reproducing the second image quality) based on the transmission system of the current digital terrestrial television broadcasting. can be played back on a television receiver capable of playing

Regarding the OFDM segment configuration for 4K on the horizontal polarization side, for example, in the OFDM segment configuration of the first embodiment, a pilot signal was inserted at the location where the carrier number is 30, but the OFDM segment of this embodiment In this configuration, an AC signal is inserted instead of a pilot signal so that receiving section 300 can determine reception quality.

Here, when the location where the AC signal or the TMCC signal is inserted and the location where the pilot signal is inserted overlap, the reception unit 401 receives the received signal even if the pilot signal is not inserted in the location. It is preferable to be configured so as to be able to appropriately perform the hardening treatment.

Next, an example of equalization processing by carrier demodulator 532 of receiver 401 will be described with reference to the drawings.

24 and 25 show an example of an OFDM segment configuration for 4K on the horizontal polarization side configured by the OFDM frame configuration section 280. FIG. Note that the OFDM segment configurations shown in FIGS. 5.

As shown in FIGS. 24 and 25, a pilot signal is inserted at the location of carrier number 30 and symbol number 2 according to the pilot signal arrangement described in the first embodiment. In the present embodiment, an AC signal is inserted in this portion so that the receiving section 300 can determine the reception quality.

Also, as shown in FIGS. 24 and 25, a pilot signal is inserted at a position where the carrier number is 51 and the symbol number is 5 according to the pilot signal arrangement described in the first embodiment. However, in the present embodiment, a TMCC signal is inserted in this portion so that the receiving section 300 can determine the reception quality.

In the OFDM segment configurations for 4K on the horizontal polarization side shown in FIGS. 24 and 25, the symbols with symbol numbers 8 to 15 have the same signal arrangement as the symbols with symbol numbers 0 to 7. is done. That is, in the 4K OFDM segment configuration on the horizontal polarization side, the same signal arrangement as the signal arrangement in symbols with symbol numbers 0 to 7 is repeated.

The carrier demodulation unit 532, as shown in FIGS. 24 and 25, for example, based on each pilot signal inserted in symbols with symbol numbers 0 to 7 in the 4K OFDM segment configuration on the horizontal polarization side , the transmission path characteristics of each carrier are estimated, and symbol strings as shown in FIGS. 24 and 25 are created.

Specifically, for example, in the symbol sequences of FIGS. 24 and 25, phase information calculated based on pilot signals inserted in each carrier ) is indicated by "1".

In the symbol strings shown in FIGS. 24 and 25, for example, "1" corresponding to the 0th carrier corresponds to the phase difference calculated based on the pilot signal in the 0th carrier and the known pilot signal. values are shown. In other words, the symbol strings shown in FIGS. 24 and 25 contain phase information calculated based on pilot signals inserted into predetermined symbols in each carrier.

Note that the carrier demodulation unit 532 calculates the average value of the values corresponding to the phase differences calculated based on the pilot signals inserted in the positions with the carrier number 0 and the symbol numbers 0 to 7, as shown in FIGS. 25, it may be configured to have a value corresponding to the phase difference at "1" corresponding to the 0th carrier.

Further, carrier demodulation section 532 converts a value corresponding to the phase difference calculated based on the pilot signal inserted at carrier number 0 and symbol number 7 into the symbol string shown in FIG. , the value may be set according to the phase difference at "1" corresponding to the 0th carrier.

Also, in the symbol strings shown in FIGS. 24 and 25, the portion where the transmission path characteristic is estimated based on the phase information indicated by "1" contained in the symbol string is "0". is indicated. Specifically, for example, in the symbol string shown in FIG. 24, the transmission path characteristics at "0" corresponding to the first carrier and the second carrier are is estimated based on the phase information in the '1's corresponding to the carriers of .

Further, the carrier demodulation unit 532 calculates, for example, phase information in a carrier in which a portion where an AC signal or a TMCC signal is inserted and a portion where a pilot signal is inserted overlap, based on the preceding and succeeding pilot signals. .

Here, in the symbol strings of FIGS. 24 and 25, the carrier where the portion where the AC signal or TMCC signal is inserted overlaps with the portion where the pilot signal is inserted is indicated by "C".

Specifically, for example, in the symbol strings shown in FIGS. and the value corresponding to the phase difference calculated based on the pilot signal inserted at the carrier number 33 is set to the value corresponding to the phase difference in the carrier having the carrier number 30. may be configured to

Specifically, for example, in the symbol strings shown in FIGS. The average value of the value corresponding to the phase difference calculated based on the pilot signal inserted at the position of carrier number 54 and the value corresponding to the phase difference in the carrier having carrier number 51. may be configured to

Then, the carrier demodulator 532 uses the created symbol sequence to estimate the transmission channel characteristics in the carrier direction. Specifically, for example, the carrier demodulator 532 generates a value corresponding to the phase difference corresponding to "1" in the symbol sequence shown in FIGS. and a value corresponding to .

Then, the carrier demodulation unit 532 performs equalization processing on the signal input from the FFT processing unit 514-a using the estimation result of the transmission path characteristics.

Specifically, for example, the carrier demodulation unit 532 uses an FIR (Finite Impulse Response) filter to create smoothed data based on the created symbol sequence, and converts the smoothed data into transmission channel characteristics. Equalization processing is applied to the signal used for estimation and input from the FFT processing unit 514-a.

In the equalization process, specifically, for example, a value corresponding to the signal input from the FFT processing unit 514-a is multiplied by a value corresponding to the inverse characteristic of the estimated channel characteristic, Amplitude and phase distortions of the signal are corrected.

Further, the carrier demodulation unit 532 performs equalization processing on the signal input from the FFT processing unit 514-b using the same processing method as the equalization processing performed on the signal input from the FFT processing unit 514-a. configured to apply.

Next, operation of the transmission unit 201 according to the second embodiment of the present invention will be described. FIG. 26 is a flow chart showing the operation of the modulating section 231 according to the second embodiment of the present invention.

First, the one-segment signal, the 2K signal, and the 4K signal are input to the modulation unit 231 (step S201).

Each unit of the modulating unit 231 synthesizes the input one-segment signal, 2K signal, and 4K signal, and performs channel coding processing (step S202). Specifically, for example, the OFDM frame construction section 280 constructs an OFDM frame as shown in FIGS.

The modulation unit 231 generates a first OFDM signal for electromagnetic waves transmitted by the horizontally polarized antenna 501 and a second OFDM signal for electromagnetic waves transmitted by the vertically polarized antenna 502 (step S203).

The modulation section 231 inputs the generated first OFDM signal to the first amplification section 240 . Also, the modulation section 231 inputs the generated second OFDM signal to the second amplification section 250 . The first amplification unit 240 amplifies the first OFDM signal input by the modulation unit 231 with a predetermined amplification factor (step S204). Then, first amplification section 240 inputs the amplified first OFDM signal to antenna 501 . The first OFDM signal amplified by the first amplifier 240 is converted into an electromagnetic wave by the antenna 501 and radiated as a horizontally polarized wave.

The second amplifier 250 amplifies the second OFDM signal input by the modulator 231 with a predetermined gain (step S204). Second amplifier 250 then inputs the amplified second OFDM signal to antenna 502 . The second OFDM signal amplified by the second amplifier 250 is converted into an electromagnetic wave by the antenna 502 and radiated as a vertically polarized wave.

Next, operation of the receiving unit 401 according to the second embodiment of the present invention will be described. FIG. 27 is a flow chart showing the operation of the receiving section 401 according to the second embodiment of the present invention.

As shown in FIG. 27, the carrier demodulator 532 receives signals from the FFT processors 514-a and 514-b (step S301).

The carrier demodulator 532 extracts a pilot signal from the signals input from the FFT processors 514-a and 514-b, and estimates transmission channel characteristics based on the pilot signal (step S302).

The carrier demodulation unit 532 performs equalization processing on the signals input from the FFT processing units 514-a and 514-b using the estimation result of the channel characteristics (step S303). A TS signal is generated by performing the above-described processing on the equalized signal in each part of the demodulator 431 . The generated TS signal is then input to decoding section 440 .

The decoding unit 440 has a function of performing predetermined decoding processing on the TS signal input from the demodulation unit 431 to generate a video signal (step S304). For example, the decoder 440 decodes the input TS signal into H.264. It is assumed that decoding processing based on H.265 can be performed to generate a video signal based on the 4K signal. Then, the decoding unit 440 can output the generated video signal. Then, the output video signal is input to a video display device such as a television receiver, and video based on the 4K signal is reproduced.

According to this embodiment, the receiving unit 300 can appropriately determine reception quality based on the current transmission system of digital terrestrial television broadcasting. That is, since the AC signal and the TMCC signal are inserted into the carrier according to the current terrestrial digital television broadcasting transmission method, the receiving unit 300 appropriately determines the reception quality using the AC signal and the TMCC signal. It can be carried out. Therefore, the receiving unit 300 can cause the television receiver to reproduce the image corresponding to the input reception signal based on the transmission system of the current terrestrial digital television broadcasting. Therefore, even if the new terrestrial broadcasting and the current terrestrial digital television broadcasting coexist, a television that can reproduce video according to the received signal input based on the current terrestrial digital television broadcasting transmission system The receiver can properly reproduce the video.

Further, according to the present embodiment, receiving section 401 calculates a value corresponding to the phase difference in a carrier where a portion where an AC signal or TMCC signal is inserted and a portion where a pilot signal is inserted overlaps with the preceding and following pilots. Calculated based on the signal. By configuring in this way, receiving section 401 can appropriately perform equalization processing on the received signal. Therefore, the receiving unit 401 can newly reproduce video corresponding to the 4K signal while continuing the state in which the current digital terrestrial television broadcasting can be received and video can be reproduced. Therefore, even if new terrestrial broadcasting and current terrestrial digital television broadcasting coexist, television receivers ( A television receiver capable of reproducing video corresponding to data for reproducing the first image quality can appropriately reproduce the video.

In the OFDM segment configuration shown in FIG. 22, as in the first embodiment of the present invention, a pilot signal and a null carrier are inserted in the first carrier, but the pilot signal and the null carrier are The OFDM frame may be configured such that it is not inserted.

Further, in the present embodiment, carrier demodulation section 532 creates a symbol string based on pilot signals in symbols with symbol numbers 0 to 7 (that is, based on pilot signals for 8 symbols). is not limited to eight.

28 and 29 show an example of an OFDM segment configuration for 4K on the horizontal polarization side configured by the OFDM frame configuration section 280. FIG. Note that the OFDM segment configurations shown in FIGS. 5.

In the OFDM segment configuration for 4K on the horizontal polarization side shown in FIGS. 28 and 29, the pilot signal and the null carrier are inserted once in 48 carriers in the carrier direction and once in 6 symbols in the symbol direction. It is That is, pilot signals and null carriers are inserted every 48 carriers, and pilot signals and null carriers are inserted every 6 symbols.

In the case of the OFDM segment configurations shown in FIGS. 28 and 29, carrier demodulation section 532, based on pilot signals in symbols with symbol numbers 0 to 5 (that is, based on pilot signals for 6 symbols), It may be configured to create a string of symbols.

In other words, the number of symbols used when carrier demodulation section 532 creates a symbol string may be determined according to the insertion interval of pilot signals.

Further, in the present embodiment, the carrier demodulation unit 532 converts a value corresponding to the phase difference in the carrier where the portion where the AC signal or TMCC signal is inserted and the portion where the pilot signal is inserted overlaps Although it is calculated based on the pilot signal, it may be configured to calculate a value corresponding to the phase difference in the overlapped carrier based on three preceding and succeeding pilot signals.

Specifically, for example, in the symbol strings shown in FIGS. and the values corresponding to the respective phase differences calculated based on the pilot signals inserted at positions with carrier numbers 33, 36, and 39. may be configured to have a value corresponding to the phase difference between the carriers.

The data configuration means may be configured to include all the units of the modulating unit 231 shown in FIGS. may be The data configuration means may be configured to include the OFDM frame configuration section 280 of the modulation section 231, for example.

Embodiment 3.
A broadcast transmission system according to a third embodiment of the present invention will be described with reference to the drawings. FIG. 30 is a block diagram showing a configuration example of a broadcasting transmission system 20 according to the third embodiment of the present invention. As shown in FIG. 30, a broadcasting transmission system 20 according to the third embodiment of the present invention includes a data configuration section 21 and a transmission processing section 22. FIG. The broadcasting transmission system 20 corresponds to, for example, the transmission section 201 in the second embodiment of the present invention. Also, the broadcasting transmission system 20 corresponds to, for example, the broadcasting transmission system 251 in the second embodiment of the present invention. The data configuration section 21 corresponds to, for example, the modulation section 231 in the second embodiment of the present invention. The transmission processing section 22 corresponds to, for example, the first amplification section 240 and the second amplification section 250 in the second embodiment of the present invention.

Based on the first image quality reproduction data and the second image quality reproduction data, the data construction unit 21 generates data for one polarized antenna transmission and data for the other polarized antenna transmission. do.

The first image quality reproduction data is, for example, data corresponding to the 4K signal included in the 4K OFDM segment configuration on the horizontal polarization side in the second embodiment, pilot signal data, and TMCC signal data. It corresponds to data and data for AC signals. The second image quality reproduction data is, for example, data corresponding to the 2K signal included in the 2K OFDM segment configuration on the horizontal polarization side in the first embodiment, pilot signal data, and TMCC signal data. It corresponds to data and data for AC signals. The data for one polarization antenna transmission is, for example, data according to the 2K signal included in the 2K OFDM segment configuration and the 4K OFDM segment configuration on the horizontal polarization side in the second embodiment, the 4K , pilot signal data, TMCC signal data, and AC signal data. The data for the other polarization antenna transmission is, for example, data according to the 4K signal included in the 4K OFDM segment configuration on the vertical polarization side in the second embodiment, pilot signal data, and TMCC signal. data for AC signal and data for AC signal.

In addition, the data configuration unit 21 arranges an AC (Auxiliary Channel) signal or a TMCC (Transmission and Multiplexing Configuration Control) signal in the data for reproducing the first image quality among the data for transmitting the one polarized wave antenna. data for the one polarized antenna transmission as described above.

In addition, the data configuration unit 21, in the data for transmission with the other polarized wave antenna, arranges a null carrier in a location corresponding to the location where the AC signal or the TMCC signal is assigned. Generate data for polarized antenna transmission.

The transmission processing unit 22 performs processing for transmitting a signal corresponding to the data for one polarized wave antenna transmission and a signal corresponding to the other polarized wave antenna transmission data.

According to this embodiment, the data configuration unit 21 generates data for one polarized antenna transmission and the other polarized wave antenna based on the first image quality reproduction data and the second image quality reproduction data. Generates data for transmission.

In addition, the data configuration unit 21 arranges an AC (Auxiliary Channel) signal or a TMCC (Transmission and Multiplexing Configuration Control) signal in the data for reproducing the first image quality among the data for transmitting the one polarized wave antenna. data for the one polarized antenna transmission as described above.

In addition, the data configuration unit 21, in the data for transmission with the other polarized wave antenna, arranges a null carrier in a location corresponding to the location where the AC signal or the TMCC signal is assigned. Generate data for polarized antenna transmission.

The transmission processing unit 22 performs processing for transmitting a signal corresponding to the data for one polarized wave antenna transmission and a signal corresponding to the other polarized wave antenna transmission data.

Therefore, even if the new terrestrial broadcasting and the current terrestrial digital television broadcasting coexist, a television that can reproduce images according to the received signal input based on the current terrestrial digital television broadcasting transmission system. A receiver or a television receiver capable of reproducing video corresponding to a received signal input based on the transmission system of new terrestrial broadcasting can appropriately reproduce video.

Embodiment 4.
A broadcast reception system according to a fourth embodiment of the present invention will be described with reference to the drawings. FIG. 31 is a block diagram showing a configuration example of a broadcast reception system 30 according to the fourth embodiment of the present invention. As shown in FIG. 31, a broadcast receiving system 30 according to the fourth embodiment of the present invention includes a receiving section 31, a determining section 32, a determining section 33, and a reproduction processing section .

The broadcast receiving system 30 corresponds to, for example, the receiving section 300 in the second embodiment of the present invention. The receiver 31 corresponds to, for example, the reception processor of the receiver 300 in the second embodiment of the present invention. The determination section 32 corresponds to, for example, the demodulation section of the reception section 300 in the second embodiment of the present invention. The determination unit 33 corresponds to, for example, the demodulation unit of the reception unit 300 according to the second embodiment of the present invention. The reproduction processing unit 34 corresponds to, for example, the decoding unit of the receiving unit 300 in the second embodiment of the present invention.

The receiving unit 31 receives a signal corresponding to first image quality reproduction data in which an AC (Auxiliary Channel) signal or TMCC (Transmission and Multiplexing Configuration Control) signal is arranged and data for second image quality reproduction. receive.

The determination unit 32 determines reception quality using the AC signal or the TMCC signal.

Based on the reception quality, the determining unit 33 reproduces the video corresponding to the data for reproducing the second image quality on the television receiver capable of reproducing the video corresponding to the data for reproducing the second image quality. decide whether to let

When the determination unit 33 determines that the video corresponding to the second image quality reproduction data is to be reproduced, the reproduction processing unit 34 instructs the television receiver to reproduce the image corresponding to the second image quality reproduction data. play back the video.

According to the present embodiment, the receiving unit 31 receives first image quality reproduction data in which AC (Auxiliary Channel) signals or TMCC (Transmission and Multiplexing Configuration Control) signals are arranged, and data for second image quality reproduction. Receive signals according to data. The determination unit 32 determines reception quality using the AC signal or the TMCC signal. Based on the reception quality, the determining unit 33 reproduces the video corresponding to the data for reproducing the second image quality on the television receiver capable of reproducing the video corresponding to the data for reproducing the second image quality. decide whether to let When the determination unit 33 determines that the video corresponding to the second image quality reproduction data is to be reproduced, the reproduction processing unit 34 instructs the television receiver to reproduce the image corresponding to the second image quality reproduction data. play back the video.

Therefore, even if the new terrestrial broadcasting and the current terrestrial digital television broadcasting coexist, a television that can reproduce images according to the received signal input based on the current terrestrial digital television broadcasting transmission system. A receiver or a television receiver capable of reproducing video corresponding to a received signal input based on the transmission system of new terrestrial broadcasting can appropriately reproduce video.

Embodiment 5.
A broadcast reception system according to a fifth embodiment of the present invention will be described with reference to the drawings. FIG. 32 is a block diagram showing a configuration example of a broadcast reception system 40 according to the fifth embodiment of the present invention. As shown in FIG. 32, a broadcast receiving system 40 according to the fifth embodiment of the present invention includes a receiving section 41, an equalizing section 42, and a reproduction processing section 43. FIG.

The broadcast receiving system 40 corresponds to, for example, the receiving section 401 in the second embodiment of the present invention. The receiving section 41 corresponds to, for example, the first reception processing section 410 of the receiving section 401 in the second embodiment of the present invention. The equalizer 42 corresponds to, for example, the demodulator 431 of the receiver 401 in the second embodiment of the present invention. The reproduction processing unit 43 corresponds to, for example, the decoding unit 440 of the receiving unit 401 in the second embodiment of the present invention.

The receiving unit 41 receives a signal corresponding to first image quality reproduction data in which a plurality of AC (Auxiliary Channel) signals or TMCC (Transmission and Multiplexing Configuration Control) signals and pilot signals are arranged.

The equalization unit 42 performs equalization processing on the signal corresponding to the data for reproducing the first image quality based on the pilot signal arranged at the predetermined position. Also, when the pilot signal is not arranged at the predetermined position, the equalization section 42 performs equalization processing based on the pilot signal arranged at another position.

The reproduction processing unit 43 provides a television receiver capable of reproducing video corresponding to the data for reproducing the first image quality based on a signal corresponding to the equalized data for reproducing the first image quality. , to reproduce a video corresponding to the data for reproducing the first image quality.

According to the present embodiment, the receiving unit 41 receives first image quality reproduction data in which a plurality of AC (Auxiliary Channel) signals or TMCC (Transmission and Multiplexing Configuration Control) signals and pilot signals are arranged. receive a signal. The equalization unit 42 performs equalization processing on the signal corresponding to the data for reproducing the first image quality based on the pilot signal arranged at the predetermined position. Also, when the pilot signal is not arranged at the predetermined position, the equalization section 42 performs equalization processing based on the pilot signal arranged at another position. The reproduction processing unit 43 provides a television receiver capable of reproducing video corresponding to the data for reproducing the first image quality based on a signal corresponding to the equalized data for reproducing the first image quality. , to reproduce a video corresponding to the data for reproducing the first image quality.

Therefore, even if the new terrestrial broadcasting and the current terrestrial digital television broadcasting coexist, a television that can reproduce images according to the received signal input based on the current terrestrial digital television broadcasting transmission system. A receiver or a television receiver capable of reproducing video corresponding to a received signal input based on the transmission system of new terrestrial broadcasting can appropriately reproduce video.

Although the present invention has been described with reference to the embodiments, the present invention is not limited to the above embodiments. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention.

Also, the present invention can be implemented based on modifications, replacements, and adjustments of each embodiment. Moreover, the present invention can also be carried out by arbitrarily combining each embodiment. That is, the present invention includes various variations and modifications that can be realized according to all disclosures and technical ideas of this specification. In addition, the reference numerals attached to each drawing are added to each element for convenience as an example to aid understanding, and are not intended to limit the present invention to the illustrated embodiment.

Some or all of the above-described embodiments can also be described in the following supplementary remarks, but are not limited to the following.
(Appendix 1)
data structuring means for generating data for one polarized antenna transmission and data for another polarized antenna transmission based on the first image quality reproduction data and the second image quality reproduction data;
A transmission processing means for performing processing for transmitting a signal corresponding to the data for transmission with one of the polarized antennas and a signal corresponding to the data for transmission with the other polarized antenna,
The data structuring means arranges an AC (Auxiliary Channel) signal or a TMCC (Transmission and Multiplexing Configuration Control) signal in the first image quality reproduction data among the data for one polarized antenna transmission. generating data for transmission of said one polarized antenna,
The data structuring means arranges, in the data for transmission with the other polarized wave antenna, the other polarized wave antenna so that a null carrier is allocated at a position corresponding to the position where the AC signal or the TMCC signal is allocated. A broadcasting transmission system characterized by generating data for antenna transmission.
(Appendix 2)
The data structuring means arranges the one polarization antenna so that pilot signals or null carriers are arranged at predetermined intervals in the first image quality reproduction data of the one polarization antenna transmission data. Broadcast transmission system according to claim 1, characterized in that it generates data for wave antenna transmission.
(Appendix 3)
The data composing means, in the data for reproducing the first image quality among the data for transmission with one of the polarized antennas, is configured so that a predetermined position where a pilot signal should be arranged and the AC signal or the TMCC signal are The broadcasting transmission system according to appendix 2, wherein the AC signal or the TMCC signal is arranged in the position when the predetermined position to be arranged overlaps.
(Appendix 4)
The data configuration means generates data for transmitting the other polarized antenna so that null carriers or pilot signals are arranged at the predetermined intervals,
In the data for transmission with one of the polarized antennas, the data structuring means adds a null carrier to a location corresponding to the locations where the pilot signals are arranged at the predetermined intervals in the data for transmission with the other polarized antenna. and a pilot signal is arranged at a position corresponding to the position where the null carrier is arranged at the predetermined interval in the data for transmission with the other polarized antenna. The broadcasting transmission system according to appendix 2 or 3, wherein the data of
(Appendix 5)
The data composing means converts the data transmitted by the lowest frequency carrier in the first image quality reproduction data among the data for transmission by one of the polarized antennas to a null carrier based on the predetermined interval. 5. The broadcasting transmission system according to any one of appendices 2 to 4, wherein the data for transmitting the one polarized wave antenna is generated so that a pilot signal is arranged instead.
(Appendix 6)
The data constructing means generates data for transmission with one of the polarized antennas so that the pilot signals are arranged over all symbols in the data transmitted on the carrier with the lowest frequency. The broadcasting transmission system according to Supplementary Note 5.
(Appendix 7)
The data structuring means arranges the one polarized wave antenna so that the pilot signals are arranged at other predetermined intervals in the second image quality reproduction data among the data for the one polarized wave antenna transmission. 7. The broadcasting transmission system according to any one of appendices 1 to 6, wherein data for antenna transmission is generated.
(Appendix 8)
Receiving means for receiving signals corresponding to data for first image quality reproduction in which an AC (Auxiliary Channel) signal or TMCC (Transmission and Multiplexing Configuration Control) signal is arranged and data for second image quality reproduction; ,
determination means for determining reception quality using the AC signal or the TMCC signal;
Based on the reception quality, it is determined whether or not to cause a television receiver capable of reproducing video corresponding to the data for reproducing the second image quality to reproduce video corresponding to the data for reproducing the second image quality. judgment means for judging,
reproduction causing the television receiver to reproduce the video corresponding to the second image quality reproduction data when the determining means determines that the video corresponding to the second image quality reproduction data is to be reproduced; A receiving system for broadcasting, comprising: processing means.
(Appendix 9)
Receiving means for receiving a signal corresponding to data for first image quality reproduction in which a plurality of AC (Auxiliary Channel) signals or TMCC (Transmission and Multiplexing Configuration Control) signals and pilot signals are respectively arranged;
equalization means for performing equalization processing on a signal corresponding to the data for reproducing the first image quality based on the pilot signal arranged at a predetermined position;
a television receiver capable of reproducing video corresponding to the data for reproducing the first image quality based on a signal corresponding to the data for reproducing the first image quality that has been equalized; a reproduction processing means for reproducing video corresponding to reproduction data,
The broadcast receiving system, wherein, when the pilot signal is not arranged at the predetermined position, the equalization means performs equalization processing based on the pilot signal arranged at another position.
(Appendix 10)
The broadcasting transmission system according to any one of Appendices 1 to 7;
A broadcasting transmitting/receiving system comprising: the broadcasting receiving system according to supplementary note 8 or 9.
(Appendix 11)
generating data for one polarized antenna transmission and data for the other polarized antenna transmission based on the first image quality reproduction data and the second image quality reproduction data;
performing processing for transmitting a signal corresponding to the data for transmission with one of the polarized antennas and a signal corresponding to the data for transmitting the other polarized antenna;
When generating the data for transmission with the one polarized antenna, in the data for reproducing the first image quality among the data for transmission with the one polarized antenna, an AC (Auxiliary Channel) signal or a TMCC (Transmission) and Multiplexing Configuration Control) to generate data for transmitting the one polarized antenna so that the signal is arranged;
When the data for transmission with the other polarization antenna is generated, in the data for transmission with the other polarization antenna, a null carrier is arranged at a location corresponding to the location where the AC signal or the TMCC signal is arranged. A transmission method for broadcasting, wherein the data for transmission with the other polarization antenna is generated as described above.
(Appendix 12)
to the computer,
Data configuration processing for generating data for one polarized antenna transmission and data for the other polarized antenna transmission based on the first image quality reproduction data and the second image quality reproduction data;
a transmission process for performing a process for transmitting a signal corresponding to the data for one of the polarized antenna transmissions and a signal corresponding to the data for the other polarized antenna transmission;
In the data configuration processing, an AC (Auxiliary Channel) signal or a TMCC (Transmission and Multiplexing Configuration Control) signal is arranged in the first image quality reproduction data among the data for one polarized antenna transmission. so as to generate data for transmission of the one polarized antenna,
In the data configuration processing, in the data for transmission with the other polarized wave antenna, the other polarized wave antenna is arranged so that a null carrier is arranged at a position corresponding to the position where the AC signal or the TMCC signal is arranged. A broadcast transmission program characterized by generating data for antenna transmission.

This application claims priority based on Japanese Patent Application No. 2018-242889 filed on December 26, 2018, and the entire disclosure thereof is incorporated herein.

20, 251 broadcast transmission system 21 data configuration unit 22 transmission processing unit 30, 40 broadcast reception system 31, 41 reception unit 32 determination unit 33 determination unit 34, 43 reproduction processing unit 42 equalization unit 100, 101 broadcasting system 200, 201 transmitter 210 encoder 211 first encoder 212 second encoder 213 third encoder 220 multiplexer 230, 231 modulator 240 first amplifier 250 second amplifier 300, 400, 401 receiver 410 first reception processing unit 420 second reception processing unit 430, 431 demodulation unit 440 decoding unit 501, 502, 601, 602 antenna 700 distributor 261-a, 262-b outer code processing unit 261-b frame configuration unit 262-a Hierarchical division unit 263-a, 263-b, 263-c First byte-bit conversion unit 264-a, 264-b, 264-c Energy diffusion unit 265-a, 265-b, 265-c Delay Correction section 266-a, 266-b, 266-c Bit-byte conversion section 267-a, 267-b, 267-c Byte interleave processing section 268-a, 268-b, 268-c Second byte-bit conversion Unit 269-a, 269-b, 269-c Convolutional encoding processing unit 270-a, 270-b, 270-c Bit interleaving processing unit 271-a, 271-b, 271-c Mapping processing unit 272 Hierarchical synthesis Unit 273 Time interleave processing unit 274 Frequency interleave processing unit 275, 280 OFDM frame configuration unit 276-a, 276-b Normalization unit 277-a, 277-b IFFT processing unit 278-a, 278-b Guard interval addition processing unit 279-a, 279-b Quadrature modulation processing unit 511-a, 511-b AD conversion unit 512-a, 512-b Quadrature demodulation processing unit 513-a, 513-b Synchronization reproduction unit 514-a, 514- b FFT processing unit 515-a, 515-b frame extraction unit 516-a, 516-b TMCC signal decoding unit 517-a, 517-b AC signal decoding unit 518, 532 carrier demodulation unit 519 frequency deinterleaving processing unit 520 time Deinterleave processing unit 521 First layer division unit 522-a, 522-b, 522-c Demapping processing unit 523-a, 523 -b, 523-c Bit deinterleaving processing unit 524-a, 524-b, 524-c Depuncture processing unit 525 Hierarchical synthesizing unit 526 Inner code decoding unit 527 Second hierarchical dividing unit 528-a, 528-b, 528 -c byte deinterleaving processing unit 529-a, 529-b, 529-c energy despreading processing unit 530 TS reproduction processing unit 531 outer code decoding unit

Claims (9)

data structuring means for generating data for one polarized antenna transmission and data for another polarized antenna transmission based on the first image quality reproduction data and the second image quality reproduction data;
A transmission processing means for performing processing for transmitting a signal corresponding to the data for transmission with one of the polarized antennas and a signal corresponding to the data for transmission with the other polarized antenna,
The data structuring means arranges an AC (Auxiliary Channel) signal or a TMCC (Transmission and Multiplexing Configuration Control) signal in the first image quality reproduction data among the data for one polarized antenna transmission. generating data for transmission of said one polarized antenna,
The data structuring means arranges, in the data for transmission with the other polarized wave antenna, the other polarized wave antenna so that a null carrier is allocated at a position corresponding to the position where the AC signal or the TMCC signal is allocated. A broadcasting transmission system characterized by generating data for antenna transmission. The data structuring means arranges the one polarization antenna so that pilot signals or null carriers are arranged at predetermined intervals in the first image quality reproduction data of the one polarization antenna transmission data. 2. The broadcast transmission system of claim 1, wherein the data for wave antenna transmission is generated. The data composing means, in the data for reproducing the first image quality among the data for transmission with one of the polarized antennas, is configured so that a predetermined position where a pilot signal should be arranged and the AC signal or the TMCC signal are 3. The broadcasting transmission system according to claim 2, wherein, when a predetermined position to be allocated overlaps, the AC signal or the TMCC signal is allocated to the position. The data configuration means generates data for transmitting the other polarized antenna so that null carriers or pilot signals are arranged at the predetermined intervals,
In the data for transmission with one of the polarized antennas, the data structuring means adds a null carrier to a location corresponding to the locations where the pilot signals are arranged at the predetermined intervals in the data for transmission with the other polarized antenna. and a pilot signal is arranged at a position corresponding to the position where the null carrier is arranged at the predetermined interval in the data for transmission with the other polarized antenna. 4. The broadcasting transmission system according to claim 2, wherein the data of . The data composing means converts the data transmitted by the lowest frequency carrier in the first image quality reproduction data among the data for transmission by one of the polarized antennas to a null carrier based on the predetermined interval. The broadcasting transmission system according to any one of claims 2 to 4, wherein the data for transmitting the one polarized wave antenna is generated so that a pilot signal is arranged instead. A broadcasting transmission system according to any one of claims 1 to 5;
Receiving means for receiving signals corresponding to data for first image quality reproduction in which an AC (Auxiliary Channel) signal or TMCC (Transmission and Multiplexing Configuration Control) signal is arranged and data for second image quality reproduction; ,
determination means for determining reception quality using the AC signal or the TMCC signal;
Based on the reception quality, it is determined whether or not to cause a television receiver capable of reproducing video corresponding to the data for reproducing the second image quality to reproduce video corresponding to the data for reproducing the second image quality. judgment means for judging,
reproduction causing the television receiver to reproduce the video corresponding to the second image quality reproduction data when the determining means determines that the video corresponding to the second image quality reproduction data is to be reproduced; with processing means
A broadcasting transmitting/receiving system comprising: a broadcasting receiving system. A broadcasting transmission system according to any one of claims 1 to 5;
Receiving means for receiving a signal corresponding to data for first image quality reproduction in which a plurality of AC (Auxiliary Channel) signals or TMCC (Transmission and Multiplexing Configuration Control) signals and pilot signals are respectively arranged;
equalization means for performing equalization processing on a signal corresponding to the data for reproducing the first image quality based on the pilot signal arranged at a predetermined position;
a television receiver capable of reproducing video corresponding to the data for reproducing the first image quality based on a signal corresponding to the data for reproducing the first image quality that has been equalized; a reproduction processing means for reproducing video corresponding to reproduction data,
The equalization means performs equalization processing based on pilot signals placed at other positions when no pilot signal is placed at the predetermined position.
with a broadcast reception system
A transmitting/receiving system for broadcasting characterized by: generating data for one polarized antenna transmission and data for the other polarized antenna transmission based on the first image quality reproduction data and the second image quality reproduction data;
performing processing for transmitting a signal corresponding to the data for one of the polarized antenna transmissions and a signal corresponding to the data for the other polarized antenna transmission;
When the data for transmission with the one polarized antenna is generated, in the data for reproducing the first image quality among the data for transmission with the one polarized antenna, an AC (Auxiliary Channel) signal or a TMCC (Transmission) and Multiplexing Configuration Control) to generate data for transmitting the one polarized antenna so that the signal is arranged;
When the data for transmission with the other polarization antenna is generated, in the data for transmission with the other polarization antenna, a null carrier is arranged at a location corresponding to the location where the AC signal or the TMCC signal is arranged. A transmission method for broadcasting, wherein the data for transmission with the other polarization antenna is generated so as to to the computer,
Data configuration processing for generating data for one polarized antenna transmission and data for the other polarized antenna transmission based on the first image quality reproduction data and the second image quality reproduction data;
a transmission process for transmitting a signal corresponding to the data for transmission with one of the polarized antennas and a signal corresponding to the data for transmission with the other polarized antenna;
In the data configuration processing, an AC (Auxiliary Channel) signal or a TMCC (Transmission and Multiplexing Configuration Control) signal is arranged in the data for reproducing the first image quality among the data for transmission with one of the polarized antennas. so as to generate data for one of the polarized antenna transmissions,
In the data configuration processing, in the data for transmission with the other polarized wave antenna, the other polarized wave antenna is arranged so that a null carrier is arranged at a position corresponding to the position where the AC signal or the TMCC signal is arranged. A broadcast transmission program characterized by generating data for antenna transmission.

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