JP2009268027A - Digital broadcast transmitter and digital broadcast receiver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a digital broadcast transmitter and a digital broadcast receiver to transmit and receive additional information without degrading the quality of high-definition content. <P>SOLUTION: A high definition encoder 110 encodes video data and voice data of content to be broadcasted with high definition quality. A low definition encoder 130 encodes the video data and the voice data of the content to be broadcasted with low definition quality. An embedding portion 140 inputs the content encoded by the low definition encoder 130 and a TMCC signal, and embeds the content into an expanded field of the TMCC signal. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a digital broadcast transmitting apparatus and a digital broadcast receiving apparatus that simultaneously transmit and receive a main signal that is digital broadcast content and a sub signal that is additional information.

Conventionally, when digital broadcast content and additional information are transmitted simultaneously, it is realized by including both a high layer signal corresponding to the digital broadcast content and a low layer signal corresponding to the additional information in the main signal. (For example, refer to Patent Document 1).
International Publication No. 99/008412 Pamphlet

  However, in the technique described in Patent Document 1, a part of the transmission area in the main signal that is originally used for a high layer signal is cut by the low layer signal. As a result, there is a problem that the quality of high-level content is degraded.

  Therefore, an object of the present invention is to provide a digital broadcast transmitting apparatus and a digital broadcast receiving apparatus that can perform transmission / reception of additional information without deteriorating high-level content quality.

  The present invention is directed to a digital broadcast transmission apparatus that simultaneously transmits a main signal that is digital broadcast content and a sub signal that is additional information. In order to achieve the above object, the digital broadcast transmitting apparatus of the present invention embeds a sub signal in an extension field of a TMCC signal and a main signal encoding unit that performs a predetermined encoding process on the main signal of the digital broadcast content. An embedding unit, a TMCC signal encoding unit that performs a predetermined encoding process on the TMCC signal in which the sub-signal is embedded, and an output from the main signal encoding unit and an output from the TMCC signal encoding unit are time-division multiplexed. And a time division multiplexing unit.

  Further, the present invention provides a signal output from the digital broadcast transmission apparatus, that is, a signal transmitted at the same time as the main signal, which is digital broadcast content, in which a sub-signal as additional information is embedded in an extension field of the TMCC signal, It is also directed to receiving digital broadcast receivers. In order to achieve the above object, the digital broadcast receiving apparatus of the present invention includes a main signal decoding unit that decodes a predetermined encoding process applied to the main signal portion of the received signal, and a TMCC signal portion of the received signal. A TMCC signal decoding unit that decodes a predetermined encoding process applied to, an extended field separation unit that extracts a sub-signal from an extended field of the decoded TMCC signal, and a predetermined process for the extracted sub-signal And a sub-signal processing unit.

  Typical sub-signals are the same content as the main signal of digital broadcast content and lower in quality than the main signal, a signal for zapping multiple channels being broadcast, and a character information signal In addition, an emergency broadcast control signal multi-valued according to an emergency level and a target area, an uplink line information signal, a signal for compensating for nonlinear distortion of a satellite repeater, and the like are conceivable.

  According to the present invention, additional information such as information related to the high layer signal is transmitted / received using the extension field of the TMCC signal instead of the payload of the high layer signal. This makes it possible to transmit / receive additional information without degrading the high-level content quality.

The present invention uses an extension field of a transmission multiplex control signal (TMCC signal; Transmission and Multiplexing Configuration Control) used for transmission of general transmission control information and the like, information related to a high layer signal which is a main signal, etc. The additional information is transmitted.
Hereinafter, additional information transmitted using the extension field will be described in detail.

(First embodiment)
FIG. 1 is a diagram showing a configuration of a digital broadcast transmitting apparatus 11 according to the first embodiment of the present invention. The digital broadcast transmitting apparatus 11 according to the first embodiment includes a high layer encoder 110, a main signal encoding unit 120, a low layer encoder 130, an embedding unit 140, a TMCC signal encoding unit 150, and a synchronization pattern generation. Unit 161, pilot generation unit 162, time division multiplexing unit 163, mapping unit 164, and frequency conversion unit 165. The main signal encoding unit 120 includes a first error correction encoding unit 121, an energy spreading unit 122, a second error correction encoding unit 123, and an interleaving unit 124. The TMCC signal encoding unit 150 includes a first error correction encoding unit 151, an energy spreading unit 152, and a second error correction encoding unit 153.

  The high hierarchy encoder 110 encodes video data and audio data of content to be broadcast with high resolution quality. For example, MPEG-4_AVC / H. H.264 compression encoding is used. The first error correction encoding unit 121 performs error correction encoding on the content encoded by the high layer encoder 110 (hereinafter referred to as a main signal) using, for example, a BCH code. The energy spreading unit 122 performs energy spreading by adding random data in accordance with a certain rule to the main signal that has been subjected to error correction coding by the first error correction coding unit 121. The second error correction encoding unit 123 performs error correction encoding on the main signal energy-spread by the energy diffusion unit 122 using, for example, an LDPC code. The interleaving unit 124 performs an interleaving process on the main signal that has been subjected to error correction coding by the second error correction coding unit 123.

  The low-layer encoder 130 encodes video data and audio data of content to be broadcast with low resolution quality. For example, MPEG-4_AVC / H. H.264 compression encoding is used. The embedding unit 140 inputs the content encoded by the low-layer encoder 130 (hereinafter referred to as a sub signal) and the TMCC signal, and embeds the sub signal in the extension field of the TMCC signal. The first error correction encoding unit 151 performs error correction encoding on the TMCC signal in which the sub signal is embedded by the embedding unit 140 using, for example, a BCH code. The energy spreading unit 152 performs energy spreading by adding random data according to a certain rule to the TMCC signal that has been subjected to error correction coding by the first error correction coding unit 151. The second error correction coding unit 153 performs error correction coding on the TMCC signal that has been energy spread by the energy spreading unit 152 using, for example, an LDPC code.

  The synchronization pattern generation unit 161 generates a synchronization pattern signal based on the TMCC signal. Pilot generating section 162 generates a pilot signal based on the TMCC signal. The time division multiplexing unit 163 outputs the main signal output from the interleaving unit 124, the TMCC signal output from the second error correction coding unit 153, the synchronization pattern signal output from the synchronization pattern generation unit 161, and the pilot generation unit 162. Pilot signals to be input are input, and these signals are multiplexed in the time axis direction according to a predetermined procedure.

  Mapping section 164 maps each signal time-division multiplexed by time-division multiplexing section 163 to a signal point determined by the phase and amplitude of the carrier. In the mapping unit 164, the main signal and the pilot signal are divided into 32 APSK (32 Amplitude Phase Shift Keying), 16 APSK (16 Amplitude Phase Shift Keying), 8PSK (8 Phase Shift Keying), QPSK (Quadrature Phase Shift Keying), π / A method such as 2BPSK (Binary Phase Shift Keying) is used, and a π / 2 BPSK method is used for the TMCC signal and the synchronization pattern signal. For example, the required C / N is 14.6 dB for a high layer signal mapped at 16 APSK (coding rate 3/4), and the required C / N is-for a low layer signal mapped at BPSK (coding rate 1/2). 0.8 dB. The frequency conversion unit 165 performs processing such as frequency conversion on the signal output from the mapping unit 164 to generate a transmission signal.

  FIG. 2 is a diagram showing a configuration of the digital broadcast receiving apparatus 12 according to the first embodiment of the present invention. The digital broadcast receiving apparatus 12 according to the first embodiment includes a tuner 211, a quadrature detection unit 212, a main signal decoding unit 220, a high layer decoder 230, a TMCC signal decoding unit 240, and an extended field separation unit. 250, a low layer decoder 260, a reception quality monitor unit 213, and a selection unit 214. The main signal decoding unit 220 includes a deinterleaving unit 221, a first error correction decoding unit 222, an energy despreading unit 223, and a second error correction decoding unit 224. The TMCC signal decoding unit 240 includes a first error correction decoding unit 241, an energy despreading unit 242, and a second error correction decoding unit 243.

  The tuner 211 selects a predetermined channel, relays a transmission signal from the digital broadcast transmission device 11 via a satellite, and receives it via an antenna (not shown). The quadrature detection unit 212 performs quadrature detection processing on the reception signal output from the tuner 211 and demodulates the digital signal. The demodulated digital signals are output to the main signal decoding unit 220 and the TMCC signal decoding unit 240, respectively.

  The deinterleaving unit 221 performs deinterleaving processing on a portion where the main signal of the digital signal output from the quadrature detection unit 212 is multiplexed. The first error correction decoding unit 222 performs error correction decoding on the main signal processed by the deinterleaving unit 221 using the LDPC code performed by the digital broadcast transmission device 11. The energy despreading unit 223 performs energy despreading on the main signal output from the first error correction decoding unit 222. The second error correction decoding unit 224 performs error correction decoding on the main signal output from the energy despreading unit 223 using the BCH code performed by the digital broadcast transmission device 11.

  The first error correction decoding unit 241 performs error correction decoding using the LDPC code performed by the digital broadcast transmission device 11 on the portion where the TMCC signal of the digital signal output from the quadrature detection unit 212 is multiplexed. . The energy despreading unit 242 performs energy despreading on the TMCC signal output from the first error correction decoding unit 241. The second error correction decoding unit 243 performs error correction decoding on the TMCC signal output from the energy despreading unit 242 using the BCH code performed by the digital broadcast transmission device 11. The extension field separation unit 250 extracts the sub-signal embedded in the extension field from the TMCC signal decoded by the second error correction decoding unit 243. Then, extended field separation section 250 provides information on various transmission parameters obtained from the TMCC signal to quadrature detection section 212 and main signal decoding section 220, and outputs the extracted sub-signal to low layer decoder 260.

  The high layer decoder 230 decodes the main signal output from the second error correction decoding unit 224, and acquires video data and audio data of content with high resolution quality. The low hierarchy decoder 260 decodes the sub-signal extracted from the extension field by the extension field separation unit 250, and acquires video data and audio data with low resolution quality. The selection unit 214 receives the content output from the high layer decoder 230 and the content output from the low layer decoder 260, selects the content according to the instruction from the reception quality monitor unit 213, and outputs the content to the display unit or the speaker. . The reception quality monitoring unit 213 determines the resolution quality of the content selected by the selection unit 214 based on the error correction amount and error correction availability information in the first and second error correction decoding units 222 and 224, that is, the reception quality. To do.

  As described above, according to the digital broadcast transmitting device 11 and the digital broadcast receiving device 12 according to the first embodiment of the present invention, the extended layer signal of the TMCC signal is used instead of the payload of the high layer signal. Transmit / receive low-level signals corresponding to the content. Thereby, transmission / reception of a low hierarchy signal can be performed without deteriorating the quality of the high hierarchy signal.

(Second Embodiment)
FIG. 3 is a diagram showing the configuration of the digital broadcast transmitting apparatus 21 according to the second embodiment of the present invention. The digital broadcast transmitting apparatus 21 according to the second embodiment has a configuration in which the low-layer encoder 130 of the digital broadcast transmitting apparatus 11 according to the first embodiment described above is replaced with a zapping stream encoder 170. Other configurations of the digital broadcast transmission device 21 are the same as those of the digital broadcast transmission device 11, and thus the same reference numerals are given and description thereof is omitted.

  FIG. 4 is a diagram showing a configuration of the digital broadcast receiving apparatus 22 according to the second embodiment of the present invention. In the digital broadcast receiving apparatus 22 according to the second embodiment, the low-level decoder 260 of the digital broadcast receiving apparatus 12 according to the first embodiment described above is replaced with the zapping stream decoder 270, and the reception quality monitor unit 213 is omitted. It is a configuration. Other configurations in the digital broadcast receiving apparatus 22 are the same as those in the digital broadcast receiving apparatus 12, and thus the same reference numerals are given and description thereof is omitted.

  The zapping stream encoder 170 inputs the content data input to the high layer encoder 110 and the content data of at least one other channel, and encodes them with zapping quality. The embedding unit 140 inputs the zapping stream signal encoded by the zapping stream encoder 170 and the TMCC signal, and embeds the zapping stream signal in the extension field of the TMCC signal.

  The extension field separation unit 250 extracts the zapping stream signal embedded in the extension field from the TMCC signal decoded by the second error correction decoding unit 243. The zapping stream decoder 270 decodes the zapping stream signal extracted from the extension field by the extension field separation unit 250, and acquires video data and audio data for zapping.

  As described above, according to the digital broadcast transmitting device 21 and the digital broadcast receiving device 22 according to the second embodiment of the present invention, the zapping stream is used by using the extension field of the TMCC signal instead of the payload of the high layer signal. Send and receive signals. As a result, the zapping stream signal can be transmitted and received without degrading the quality of the high layer signal.

(Third embodiment)
FIG. 5 is a diagram showing a configuration of a digital broadcast transmission device 31 according to the third embodiment of the present invention. The digital broadcast transmission apparatus 31 according to the third embodiment replaces the low-level encoder 130 of the digital broadcast transmission apparatus 11 according to the first embodiment described above with the character information encoder 171 and embeds character information in the extension field. It is the composition made. Other configurations in the digital broadcast transmission device 31 are the same as those in the digital broadcast transmission device 11, and thus the same reference numerals are given and description thereof is omitted.

  FIG. 6 is a diagram showing a configuration of a digital broadcast receiving apparatus 32 according to the third embodiment of the present invention. In the digital broadcast receiving apparatus 32 according to the third embodiment, the low-level decoder 260 and the selection unit 214 of the digital broadcast receiving apparatus 12 according to the first embodiment described above are replaced with the character information decoder 280 and the display multiplexing unit 215. The reception quality monitor unit 213 is omitted. Other configurations of the digital broadcast receiving device 32 are the same as those of the digital broadcast receiving device 12, and thus the same reference numerals are given and description thereof is omitted.

  Character information such as emergency broadcast and news is encoded by the character information encoder 171 and then input to the embedding unit 140. The embedding unit 140 inputs the TMCC signal and the encoded character information, and embeds the character information signal in the extension field of the TMCC signal.

  The extension field separation unit 250 extracts the character information signal embedded in the extension field from the TMCC signal decoded by the second error correction decoding unit 243. The character information decoder 280 decodes the character information signal extracted from the extended field by the extended field separation unit 250, and acquires character information (message or the like). The display multiplexing unit 215 multiplexes the character information acquired by the character information decoder 280 with the content output from the high layer decoder 230.

  As described above, according to the digital broadcast transmitting device 31 and the digital broadcast receiving device 32 according to the third embodiment of the present invention, the extension field of the TMCC signal is used instead of the payload of the high layer signal, and the character information Send and receive. Thereby, transmission / reception of character information can be performed without degrading the quality of the high layer signal. In addition, since the TMCC signal that is the strongest layer and does not use interleaving processing is used, character information such as emergency broadcast can be transmitted with high durability and low delay.

(Fourth embodiment)
FIG. 7 is a diagram showing a configuration of a digital broadcast transmission device 41 according to the fourth embodiment of the present invention. The digital broadcast transmission apparatus 41 according to the fourth embodiment replaces the low-layer encoder 130 of the digital broadcast transmission apparatus 11 according to the first embodiment described above with the emergency broadcast control information encoder 172, and performs emergency broadcast control in the extension field. In this configuration, information is embedded. The other configuration of the digital broadcast transmission device 41 is the same as that of the digital broadcast transmission device 11, and thus the same reference numerals are assigned and description thereof is omitted.

  FIG. 8 is a diagram showing a configuration of a digital broadcast receiving apparatus 42 according to the fourth embodiment of the present invention. The digital broadcast receiving apparatus 42 according to the fourth embodiment replaces the low-level decoder 260 and the selection unit 214 of the digital broadcast receiving apparatus 12 according to the first embodiment described above with the emergency broadcast control information decoder 290, and receives the reception quality. In this configuration, the monitor unit 213 is omitted. Other configurations in the digital broadcast receiving apparatus 42 are the same as those in the digital broadcast receiving apparatus 12, and therefore, the same reference numerals are given and description thereof is omitted.

  The emergency broadcast control information that has been multi-valued based on the degree of urgency or the target area (for example, specified by the postal code or GPS information) is encoded by the emergency broadcast control information encoder 172 and then input to the embedding unit 140. Is done. The embedding unit 140 inputs the TMCC signal and the encoded emergency broadcast control information, and embeds the emergency broadcast control information signal in the extension field of the TMCC signal.

  The extension field separation unit 250 extracts the emergency broadcast control information signal embedded in the extension field from the TMCC signal decoded by the second error correction decoding unit 243. The emergency broadcast control information decoder 290 decodes the emergency broadcast control information signal extracted from the extension field by the extension field separation unit 250, and acquires emergency broadcast control information. This emergency broadcast control information is used for control of the digital broadcast receiver 42. For example, control such as forcibly changing the viewing channel or switching to emergency broadcasting only in the case of the target area.

  As described above, according to the digital broadcast transmission device 41 and the digital broadcast reception device 42 according to the fourth embodiment of the present invention, the emergency broadcast control is performed using the extension field of the TMCC signal instead of the payload of the high layer signal. Send and receive information. Thereby, it is possible to transmit and receive emergency broadcast control information without degrading the quality of the high layer signal. Moreover, since the TMCC signal which is the strongest layer and does not use interleaving processing is used, emergency broadcast control information can be transmitted with high durability and low delay.

(Fifth embodiment)
FIG. 9 is a diagram showing a configuration of a digital broadcast transmission device 51 according to the fifth embodiment of the present invention. The digital broadcast transmission apparatus 51 according to the fifth embodiment has a configuration in which the low layer encoder 130 of the digital broadcast transmission apparatus 11 according to the first embodiment described above is omitted and the uplink line information is embedded in the extension field. It is. Other configurations in the digital broadcast transmission apparatus 51 are the same as those in the digital broadcast transmission apparatus 11, and thus the same reference numerals are given and description thereof is omitted.

  FIG. 10 is a diagram showing a configuration of a digital broadcast receiving device 52 according to the fifth embodiment of the present invention. The digital broadcast receiver 52 according to the fifth embodiment includes the low-level decoder 260 and the selection unit 214 of the digital broadcast receiver 12 according to the first embodiment described above, the uplink quality monitoring unit 300, and the display multiplexing unit 215. Instead of this, the reception quality monitor unit 213 is omitted. Other configurations of the digital broadcast receiving device 52 are the same as those of the digital broadcast receiving device 12, and thus the same reference numerals are given and description thereof is omitted.

  The embedding unit 140 receives the TMCC signal and the uplink line information, and embeds the uplink line information in the extension field of the TMCC signal.

  The extension field separation unit 250 extracts uplink line information embedded in the extension field from the TMCC signal decoded by the second error correction decoding unit 243. The uplink quality monitoring unit 300 analyzes the quality of the uplink line according to the uplink line information extracted from the extension field by the extension field separation unit 250, and generates uplink line information (message or the like) as necessary. The display multiplexing unit 215 multiplexes the uplink line information generated by the uplink quality monitoring unit 300 with the content output from the high layer decoder 230.

  As described above, according to the digital broadcast transmitting device 51 and the digital broadcast receiving device 52 according to the fifth embodiment of the present invention, the uplink line is used by using the extension field of the TMCC signal instead of the payload of the high layer signal. Send and receive information. Thereby, uplink line information can be transmitted / received without degrading the quality of the high-layer signal. Further, since the uplink line quality can be grasped on the receiving apparatus side, the cause of the transmitting side / receiving side at the time of reception failure can be easily separated.

(Sixth embodiment)
FIG. 11 is a diagram showing a configuration of a digital broadcast transmission device 61 according to the sixth embodiment of the present invention. The digital broadcast transmission apparatus 61 according to the sixth embodiment is configured such that the low-layer encoder 130 of the digital broadcast transmission apparatus 11 according to the first embodiment described above is omitted and the nonlinear characteristic information of the satellite repeater is embedded. It is. The other configuration of the digital broadcast transmission device 61 is the same as that of the digital broadcast transmission device 11, and thus the same reference numerals are assigned and description thereof is omitted.

  FIG. 12 is a diagram showing a configuration of a digital broadcast receiving device 62 according to the sixth embodiment of the present invention. The digital broadcast receiving apparatus 62 according to the sixth embodiment omits the low-level decoder 260, the reception quality monitoring unit 213, and the selection unit 214 of the digital broadcast receiving apparatus 12 according to the first embodiment described above, and the tuner 211 And a quadrature detection unit 212, a non-linear distortion compensation unit 216 is provided. Other configurations of the digital broadcast receiving device 62 are the same as those of the digital broadcast receiving device 12, and thus the same reference numerals are given and description thereof is omitted.

  The embedding unit 140 inputs the TMCC signal and the non-linear characteristic information of the satellite repeater, and embeds the non-linear characteristic information of the satellite repeater in the extension field of the TMCC signal. As this non-linear characteristic information, information in which the correspondence between input power, output power, and output phase is tabulated can be considered.

  The extension field separation unit 250 extracts nonlinear characteristic information of the satellite repeater embedded in the extension field from the TMCC signal decoded by the second error correction decoding unit 243. Then, the extended field separation unit 250 outputs the extracted nonlinear characteristic information to the nonlinear distortion compensation unit 216. The non-linear distortion compensation unit 216 compensates for the linear distortion of the transmission signal output from the tuner 211 based on the non-linear characteristic information provided from the extension field separation unit 250. In this compensation, for example, when the output power and output phase of the satellite repeater have the characteristics shown in FIG. 13A, the characteristics of the output power and output phase of the nonlinear distortion compensator 216 are as shown in FIG. It is done by setting to.

  As described above, according to the digital broadcast transmitting device 61 and the digital broadcast receiving device 62 according to the sixth embodiment of the present invention, the satellite repeater is used by using the extension field of the TMCC signal instead of the payload of the high layer signal. Transmit / receive nonlinear characteristic information. Thereby, the nonlinear characteristic information of the satellite repeater can be transmitted / received without degrading the quality of the high layer signal. In addition, since it is not necessary to estimate the nonlinear characteristics of the satellite repeater by averaging the pilot carriers, the synchronization pull-in can be speeded up.

(Seventh embodiment)
FIG. 14 is a diagram showing a configuration of a digital broadcast transmission device 71 according to the seventh embodiment of the present invention. The digital broadcast transmission device 71 according to the seventh embodiment has a configuration in which a low layer encoder 131 and a time division multiplexing unit 180 are further added to the digital broadcast transmission device 11 according to the first embodiment described above. The other configuration of the digital broadcast transmission device 71 is the same as that of the digital broadcast transmission device 11, and thus the same reference numerals are assigned and description thereof is omitted.

  FIG. 15 is a diagram showing a configuration of a digital broadcast receiving apparatus 72 according to the seventh embodiment of the present invention. The digital broadcast receiving apparatus 72 according to the seventh embodiment has a configuration in which a separation unit 263 and a low layer decoder 261 are further added to the digital broadcast receiving apparatus 12 according to the first embodiment described above. Other configurations of the digital broadcast receiving device 72 are the same as those of the digital broadcast receiving device 12, and thus the same reference numerals are given and description thereof is omitted.

  The low-layer encoder 131 encodes only the video data of the content to be broadcast with low resolution quality. For example, MPEG-4_AVC / H. H.264 compression encoding is used. The low hierarchy encoder 130 encodes only the audio data of the content to be broadcast at a low rate. The time division multiplexing unit 180 multiplexes the high-quality content signal encoded by the high-layer encoder 110 and the low-quality content signal encoded by the low-layer encoder 131 in the time axis direction (main signal). The embedding unit 140 receives the audio content encoded by the low-level encoder 130 and the TMCC signal, and embeds the audio content (sub signal) in the extension field of the TMCC signal.

  The separation unit separates the high-quality content signal and the low-quality content signal from the main signal output from the second error correction decoding unit 224. The high-level decoder 230 decodes the signal separated by the separation unit, and acquires video data and audio data of content with high resolution quality. The low hierarchy decoder 261 decodes the signal separated by the separation unit, and acquires video data of content with low resolution quality. The extension field separation unit 250 extracts the sub-signal embedded in the extension field from the TMCC signal decoded by the second error correction decoding unit 243. The low hierarchy decoder 260 decodes the sub-signal extracted from the extension field by the extension field separation unit 250, and acquires the audio data of the content with the low rate quality. The selection unit 214 inputs the content output from the high layer decoder 230 and the content output from the low layer decoders 260 and 261, selects the content according to the instruction from the reception quality monitor unit 213, and displays the display unit and the speaker. Output to.

  For example, the required C / N is 20.8 dB for a high layer signal mapped with 32APSK (coding rate 4/5), and the required C / N is for a low layer video signal mapped with QPSK (coding rate 3/4). This is 5.2 dB, and the required C / N is -0.8 dB for a low-layer audio signal mapped with BPSK (coding rate 1/2).

  As described above, according to the digital broadcast transmission device 71 and the digital broadcast reception device 72 according to the seventh embodiment of the present invention, the payload of the high layer signal is consumed to some extent, but the reception environment is deteriorated due to rain attenuation or the like. In this case, analog television-like graceful degradation such as high hierarchy video / audio → low hierarchy video → low hierarchy audio can be realized. The configuration of the seventh embodiment is an example, and the low-layer encoder 131 may be configured to handle both video data and audio data, or the low-layer encoder 131 itself may be omitted (that is, Only audio data is transmitted by the low-level encoder 130).

  The present invention can be used in a digital broadcasting system or the like, and is particularly useful when it is desired to transmit / receive additional information without degrading the quality of a high layer signal.

The figure which shows the structure of the digital broadcast transmitter 11 which concerns on the 1st Embodiment of this invention. The figure which shows the structure of the digital broadcast receiver 12 which concerns on the 1st Embodiment of this invention. The figure which shows the structure of the digital broadcast transmitter 21 which concerns on the 2nd Embodiment of this invention. The figure which shows the structure of the digital broadcast receiver 22 which concerns on the 2nd Embodiment of this invention. The figure which shows the structure of the digital broadcast transmission apparatus 31 which concerns on the 3rd Embodiment of this invention. The figure which shows the structure of the digital broadcast receiver 32 which concerns on the 3rd Embodiment of this invention. The figure which shows the structure of the digital broadcast transmitter 41 which concerns on the 4th Embodiment of this invention. The figure which shows the structure of the digital broadcast receiver 42 which concerns on the 4th Embodiment of this invention. The figure which shows the structure of the digital broadcast transmitter 51 which concerns on the 5th Embodiment of this invention. The figure which shows the structure of the digital broadcast receiver 52 which concerns on the 5th Embodiment of this invention. The figure which shows the structure of the digital broadcast transmitter 61 which concerns on the 6th Embodiment of this invention. The figure which shows the structure of the digital broadcast receiver 62 which concerns on the 6th Embodiment of this invention. The figure explaining the concept of the nonlinear distortion compensation process which the nonlinear distortion compensation part 216 performs The figure which shows the structure of the digital broadcast transmitter 71 which concerns on the 7th Embodiment of this invention. The figure which shows the structure of the digital broadcast receiver 72 which concerns on the 7th Embodiment of this invention.

Explanation of symbols

11, 21, 31, 41, 51, 61, 71 Digital broadcast transmission device 12, 22, 32, 42, 52, 62, 72 Digital broadcast reception device 110 High layer encoder 120 Main signal encoding unit 121, 123, 151, 153 Error correction encoding unit 122, 152 Energy spreading unit 124 Interleaving unit 130, 131 Low layer encoder 140 Embedding unit 150 TMCC signal encoding unit 161 Synchronization pattern generating unit 162 Pilot generating unit 163, 180 Time division multiplexing unit 164 Mapping unit 165 Frequency converter 170 Zapping stream encoder 171 Character information encoder 172 Emergency broadcast control information encoder 211 Tuner 212 Orthogonal detector 213 Reception quality monitor 214 Selector 215 Display multiplexer 216 Nonlinear distortion compensator 220 Main signal decoding Unit 221 deinterleaving unit 222, 224, 241, 243 error correction decoding unit 223, 242 energy despreading unit 230 high layer decoder 240 TMCC signal decoding unit 250 extended field separation unit 260, 261 low layer decoder 263 separation unit 270 zapping Stream decoder 280 Character information decoder 290 Emergency broadcast control information decoder 300 Uplink quality monitoring unit

Claims (14)

A digital broadcast transmission device that simultaneously transmits a main signal that is digital broadcast content and a sub signal that is additional information,
A main signal encoding unit that performs a predetermined encoding process on the main signal of the digital broadcast content;
An embedding unit for embedding the sub-signal in the extension field of the TMCC signal;
A TMCC signal encoding unit that performs a predetermined encoding process on the TMCC signal in which the sub-signal is embedded;
A digital broadcast transmitting apparatus comprising: a time division multiplexing unit that time-division-multiplexes an output from the main signal encoding unit and an output from the TMCC signal encoding unit.   The digital broadcast transmission device according to claim 1, wherein the sub-signal is a signal having the same content as the main signal of the digital broadcast content and having a lower quality than the main signal.   The digital broadcast transmission apparatus according to claim 1, wherein the sub-signal is a signal for zapping a plurality of broadcast channels.   The digital broadcast transmission apparatus according to claim 1, wherein the sub signal is a character information signal.   The digital broadcast transmission device according to claim 1, wherein the sub signal is an emergency broadcast control signal that is multi-valued according to an emergency level and a target area.   The digital broadcast transmission apparatus according to claim 1, wherein the sub signal is a signal of uplink line information.   The digital broadcast transmission apparatus according to claim 1, wherein the sub-signal is a signal for compensating for nonlinear distortion of a satellite repeater. A digital broadcast receiving device that receives a signal transmitted simultaneously with a main signal that is digital broadcast content in which a sub-signal that is additional information is embedded in an extension field of a TMCC signal,
A main signal decoding unit for decoding a predetermined encoding process applied to the main signal portion of the received signal;
A TMCC signal decoding unit for decoding a predetermined encoding process applied to the TMCC signal part of the received signal;
An extension field separation unit for extracting the sub-signal from the extension field of the decoded TMCC signal;
A digital broadcast receiving apparatus comprising: a sub-signal processing unit that performs predetermined processing on the extracted sub-signal.   The digital broadcast receiving apparatus according to claim 1, wherein the sub signal is a signal having the same content as a main signal of the digital broadcast content and having a lower quality than the main signal.   The digital broadcast receiving apparatus according to claim 1, wherein the sub-signal is a signal for zapping a plurality of broadcast channels.   The digital broadcast receiving apparatus according to claim 1, wherein the sub signal is a character information signal.   The digital broadcast receiving apparatus according to claim 1, wherein the sub signal is an emergency broadcast control signal that is multi-valued according to an emergency level and a target area.   The digital broadcast receiving apparatus according to claim 1, wherein the sub signal is a signal of uplink line information.   The digital broadcast receiving apparatus according to claim 1, wherein the sub-signal is a signal for compensating for nonlinear distortion of a satellite repeater.

Images