JP2004194265A - Digital terrestrial broadcasting reception processing device, digital terrestrial broadcasting relay transmission apparatus, broadcast information recording apparatus, and digital terrestrial broadcasting relay transmission method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a digital terrestrial broadcasting relay transmission apparatus which makes relay transmission possible while avoiding multistage connection with a microwave network and maintaining signal quality. <P>SOLUTION: A digital terrestrial broadcast wave of a speicfic channel is selectively received at a tuner 12. A digital broadcast signal (TS, TMCC/AC) is demodulated from a received signal at a demodulation part 13. Then an error correction is applied by decoding parts 14 and 15 to restore CN deterioration and decode. After TOT rewriting in consideration of a loss time required for signal processing at a TOT rewriting processing part 16, time division multiplex is performed by a multiplexing processing part 17 to reconfigurate a TS broadcast signal and then transmit from a TTL transmission part 18 to a nextstage relay station by a TTL wave. By arranging such a relay transmittion apparatus as this for an intermediate relay station, TTL 2-stage relay is disolved while maintaining the signal quality. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a relay transmission technique for digital terrestrial broadcasting.
[0002]
[Prior art]
In Japan, terrestrial digital broadcasting is scheduled to start recently. This digital broadcasting is based on SFN (Single Frequency Networks: single frequency network). For this reason, in the relay transmission, a method of receiving a broadcast in a preceding stage and broadcasting it by changing a channel, unlike the current analog broadcast, cannot be used. In addition, SFNs adjust the transmission timing of radio waves in consideration of mutual interference. However, the amount of delay between receiving and retransmitting a broadcast wave is determined by the transmission distance from the preceding station. It is impossible to adjust to a timing faster than the delay amount. For this reason, in general, a separate line (TTL (Transmitter to Transmitter Link)) that enables reception at a timing earlier than the reception of the broadcast wave at the preceding stage is essential.
[0003]
On the other hand, in analog broadcasting, when multi-stage relay is performed, noise increases, the CN ratio deteriorates, and the quality of audio and video is reduced, but it is not possible to see or hear a certain level of reception. There is no. On the other hand, in the case of digital broadcasting, as noise increases, demodulation becomes suddenly impossible, and the situation suddenly falls into an unserviceable state.
[0004]
From the above, in the relay transmission of digital terrestrial broadcasting, it is assumed that a microwave line (a communication line using a microwave band) is used instead of using a broadcast wave as in conventional analog broadcasting. .
[0005]
However, when using a micro line, it is necessary to connect the micro line in multiple stages in order to cover a wide broadcasting area such as the Kanto area with relay transmission. In such a relay transmission, the number of lines becomes enormous and a great deal of cost is required. In addition, as the transmission distance becomes longer, the signal quality is greatly deteriorated due to noise, which may hinder the broadcast at the relay destination. .
[0006]
In the broadcasting business, an actual broadcast is received and the contents of the broadcast are simultaneously recorded for the purpose of investigating a cause when a broadcast accident occurs. In conventional analog broadcasting, recording was relatively easy using a VTR or the like, but in digital broadcasting, a plurality of programs were broadcast on the same channel, partial reception and data broadcasting were implemented. Simply recording a selected program, such as a broadcast, cannot keep a record of all broadcast contents.
[0007]
[Problems to be solved by the invention]
The present invention has been made in view of the above circumstances, and has a terrestrial digital broadcast reception processing device capable of reconstructing a terrestrial digital broadcast signal at a receiving point, and a separate line such as a micro line using the device. A terrestrial digital broadcast relay transmission device capable of relay transmission while maintaining signal quality while avoiding multistage connection, and a relay transmission method thereof, and broadcast information capable of recording all broadcast contents at a reception point using the reception processing device It is an object of the present invention to provide a recording apparatus, and a terrestrial digital broadcast relay transmission apparatus that supports relay transmission to cable television broadcasting, and a relay transmission method thereof.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, a terrestrial digital broadcast reception processing device according to the present invention includes a receiving unit that selectively receives a terrestrial digital broadcast wave of a specific channel, and demodulates a digital broadcast signal from a received signal of the receiving unit. A demodulation unit, an error correction processing unit for performing error correction on the output of the demodulation unit, and a reconfiguration processing unit for reconfiguring the signal transmission format of the digital broadcast signal output from the error correction processing unit including control information. And characterized in that:
[0009]
In addition, the terrestrial digital broadcast relay transmission device and the relay transmission method according to the present invention use the terrestrial digital broadcast reception processing device having the above configuration to convert a terrestrial digital broadcast signal reconfigured by the reception processing device into a TTL (Transmitter) signal. to Transmitter Link: A radio transmission path between transmitting stations is converted and transmitted, or is converted to an OFDM (Orthogonal Frequency Division Multiplex) signal of an arbitrary broadcast channel, and is transmitted, or an arbitrary cable television is transmitted. It is characterized in that it is converted into a TS for TS (Transport Stream) and transmitted.
[0010]
Also, a broadcast information recording device according to the present invention includes: a terrestrial digital broadcast reception processing device having the above configuration; and a recording device that records all information of a terrestrial digital broadcast signal reconstructed by the reception processing device. Features.
[0011]
According to the terrestrial digital broadcast reception processing device having the above configuration, the terrestrial digital broadcast wave is directly received, the digital broadcast signal is demodulated, error correction is performed, CN degradation is cleared, signal quality degradation is prevented, and control is performed. The signal transmission format including the information can be reconstructed. Therefore, by using this reception processing device as a relay transmission device or method, relay transmission can be performed without deteriorating signal quality, and TTL multi-stage relay can be avoided. Further, it becomes possible to directly provide a terrestrial digital broadcast signal to a cable television broadcast. Further, by using the present invention for a broadcast information recording device for monitoring broadcast contents, all information of digital terrestrial broadcasting can be recorded easily and at low cost.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0013]
FIG. 1 shows a terrestrial digital broadcast system to which the present invention is applied. Here, as an example, an OFDM terrestrial digital broadcast wave (for example, channel 25) transmitted from Tokyo Tower A is received by Kiryu Relay Station B. Then, the TTL signal is converted to a TTL wave and relay-transmitted to Maebashi relay station C. In Maebashi relay station C, the received TTL signal is OFDM-modulated and retransmitted on channel 33 (MFN (Multi Frequency Networks) allocated channel). Is shown.
[0014]
That is, in the relay transmission of the above-mentioned system, a digital terrestrial broadcast wave is directly received, a digital broadcast signal is demodulated, a signal transmission format is reconfigured including control information after error correction, and then converted to a TTL wave. It is characterized by transmitting digital broadcast waves from Tokyo Tower A to Kiryu Relay Station B, transmitting TTL waves by micro-line from Kiryu Relay Station B to Maebashi Relay Station C, The signal is OFDM modulated again and transmitted as a terrestrial digital broadcast wave into the service area.
[0015]
FIG. 2 is a block diagram showing a specific configuration of the relay transmission device arranged in the Kiryu relay station B in order to realize the relay transmission.
[0016]
The relay transmission device shown in FIG. 2 is roughly divided into a digital broadcast reception processing unit and a transmission / recording processing unit.
[0017]
In the digital broadcast wave reception processing section, a reception signal received by the reception antenna 11 is supplied to a tuner section 12. Here, the 25th channel, which is the transmission channel of Tokyo Tower A, is selected to obtain an OFDM signal in the IF band (hereinafter, OFDM-IF signal). This OFDM-IF signal is supplied to the demodulation unit 13. The demodulation unit 13 demodulates a digital broadcast signal by performing an FFT (Fast Fourier Transform) process on the OFDM-IF signal.
[0018]
The digital broadcast signal obtained by this demodulation processing is divided into two parts: a TS signal that is a broadcast content of a program or the like, and a TMCC (Transmission and Multiplexing Configuration Control) signal and an AC (Auxiliary Channel) signal that are broadcast transmission control signals. And supplied to the respective decoding units 14 and 15.
[0019]
The TS signal is supplied to the TS decoding unit 14, where decoding including error correction is performed. As a result, data damaged by noise or fading during transmission is restored. Further, the TS decoding unit 14 regenerates hierarchical information that is not directly included in the TS signal (broadcast wave) from the transmission pattern of the TS or the like, and supplies the hierarchical information to the multiplex processing unit 17. Further, the TS signal itself is supplied to the TOT rewriting processing unit 16 and rewrites a TOT (Time Offset Table) that requires rewriting. This is to add the delay time generated by the processing in the present apparatus to the data of the TOT, and after the processing, it is supplied to the multiplex processing unit 17. In addition, when performing hierarchical transmission, it is possible to select a time interval length having a different delay time for each layer. In such a case, processing according to the time difference for each layer is performed.
[0020]
On the other hand, the TMCC signal and the AC signal are subjected to decoding processing including error correction by a decoding unit 15 different from the TS signal, and are supplied to a multiplex processing unit 17.
[0021]
The multiplex processing unit 17 performs time division multiplexing of the reconstructed TS signal, TMCC signal, AC signal, and control information, thereby re-creating a 32.5 Mbps broadcast TS specified in the Japanese terrestrial digital broadcasting system. Constitute. At this time, the 8.13 MHz reference clock and frame pulse are reproduced from the received broadcast wave and sent to the transmission / recording processing unit together with the reconstructed broadcast TS. The 8.13 MHz reference clock may be transmitted after being converted to another frequency such as 10 MHz depending on the transmission / recording device.
[0022]
The transmission / recording processing unit includes a TTL transmission device 18, an OFDM modulation / transmission device 19, and a broadcast signal recording device 20, and distributes the broadcasting TS reconfigured by the multiplex processing unit 17 to the devices 18 to 20. .
[0023]
The TTL transmitting device 18 converts an input TS signal into a microwave band signal and amplifies the power, and the output is transmitted from the transmitting antenna 21 to the Maebashi relay station C as a TTL wave.
[0024]
The OFDM modulation / transmission device 19 performs OFDM modulation on an input TS signal, converts the input TS signal into a frequency band of a broadcast channel assigned in advance by SFN or MFN, and amplifies power. Sent out.
[0025]
The broadcast signal recording device 20 records all information being broadcast, including reconstructed control information, by recording the input TS signal as it is on a recording medium such as a hard disk, so that the cause of the broadcast accident can be reduced. When verification and analysis for investigation and the like are required, various information can be reproduced.
[0026]
That is, in the relay transmission device having the above-described configuration, the reception processing unit directly receives the terrestrial digital broadcast wave, demodulates the digital broadcast signal, performs error correction, and clears the CN deterioration. The deteriorated signal quality can be recovered. In addition, since the control information such as the TMCC signal and the AC signal is reconstructed for each frame of the demodulated digital broadcast signal and the TOT rewriting process is performed, the synchronous reproduction at the time of reception reproduction is impaired due to the relay transmission delay. Can be prevented. In addition, local information management such as countdown and activation of an emergency alert can be performed.
[0027]
In addition, since the layer information multiplexed in the broadcast signal is separated and reproduced, and multiplexed again in the TS reproduction signal, not only the base information for the fixed reception terminal but also the additional information for the portable reception terminal. Can also be transmitted reliably.
[0028]
Further, in the OFDM standardization system in Japan, a plurality of modes are defined as guard interval lengths. However, since a mode search is performed at the time of demodulation and synchronous reproduction is switched based on the search result, guarding of the OFDM wave is performed. It is possible to reliably cope with the interval length, and it is possible to prevent a malfunction during demodulation.
[0029]
In the above-described system, by arranging the relay transmission device having the above configuration in the Kiryu relay station B, it is possible to ensure signal quality, multiplex necessary information, and retransmit with a TTL wave of the TS system. And TTL two-stage relay from Tokyo Tower A to Maebashi Relay Station C can be eliminated. As a result, there is no need to use a TTL line. As a result, the broadcaster has the advantage of cost reduction, and the government does not need to allocate a new radio frequency, contributing to the effective use of radio waves. can get.
[0030]
Further, the TS broadcast signal reconstructed by the reception processing unit can be converted into an OFDM signal by the OFDM modulation / transmission device 19 and retransmitted from the transmission antenna 22 to the Kiryu service area by SFN. Of course, the retransmission of the OFDM digital broadcast wave alone is also possible.
[0031]
Further, assuming that the MFN channel is assigned to Kiryu relay station B, it is possible to receive the broadcast wave, clear the noise component by error correction, and then transmit the remultiplexed TS broadcast signal on another channel. In this case, since it is MFN, there is no need to adjust the timing, and transmission is possible without considering the distance to the transmission point in the preceding stage.
[0032]
The same can be applied to other relay systems.
[0033]
For example, in the Utsunomiya relay station, if the relay transmission device having the above configuration is used, the 25th channel from the Tokyo Tower is received and transmitted to the subsequent Yaita relay station or the like by TTL, and the Utsunomiya relay station is assigned by the MFN channel allocation. The user himself can broadcast on the 34th channel.
[0034]
If the relay transmission device having the above configuration is used in the Mito relay station, the 25th channel from the Tokyo Tower is received, the TTL wave is transmitted to the subsequent Hitachi relay station and the like, and the 14th Mito relay station itself transmits the TTL wave. It becomes possible to perform OFDM retransmission on the channel. Also in this case, the TTL two-stage relay can be eliminated in the relay transmission device while improving quality deterioration due to noise and the like.
[0035]
In the above embodiment, the purpose is to eliminate the TTL two-stage relay. However, it is naturally possible to eliminate the TTL multi-stage relay.
[0036]
In addition, the present invention is not limited to the 25th channel transmitted from Tokyo Tower, and can be similarly applied to terrestrial digital broadcasting of other channels.
[0037]
By the way, broadcasters need to monitor and record broadcast contents when a broadcast accident occurs, for example, because the cause must be investigated and clarified. For this reason, in the conventional analog broadcasting, a broadcast wave is actually received, and the entire broadcast content is recorded on a VTR or the like.
[0038]
However, in digital broadcasting, it is planned to broadcast a plurality of programs on the same channel, or to perform partial reception and data broadcasting. Recording individual broadcast contents requires a large number of receiving devices, Equipment is required.
[0039]
Therefore, in the present invention, as shown in FIG. 2, the TS broadcast signal reconstructed by the reception processing unit is recorded simultaneously in the broadcast signal recording device 20. That is, the TS broadcast signal contains all the information actually broadcast, and if the recorded content of the broadcast signal recording device 20 is reproduced, a broadcast signal similar to that when an actual broadcast wave is received is obtained. Thus, an arbitrary program including partial reception and data broadcasting can be selectively extracted.
[0040]
Therefore, as the recording device required for monitoring, one broadcast signal recording device 20 may be prepared, and it is possible to cope with it very simply and at low cost. In this case, since the control information is reconstructed and stored, the processing at the time of reproduction can be handled by the normal reception / reproduction processing.
[0041]
The installation location of the broadcast signal recording device 20 is not limited to a relay station, but may be installed in a broadcasting station together with the reception processing unit shown in FIG. Further, the broadcast signal recording device 20 can be used alone.
[0042]
In the above embodiment, the digital broadcast wave from the preceding stage is received and demodulated. However, when an OFDM-IF signal is transmitted from the preceding stage relay station as an IF-TTL wave, as shown in FIG. Next, after receiving the IF-TTL wave by the IF receiving antenna 23 and detecting the OFDM-IF signal by the IF-TTL receiving device 24, the OFDM-IF signal is input to the demodulation unit 13 shown in FIG. It may be performed.
[0043]
In digital broadcasting, the effectiveness when diversity receiving is performed in the receiving unit has been recognized. Therefore, in the reception processing unit shown in FIG. 2, a plurality of systems including the reception antenna 11, the tuner unit 12, and the demodulation unit 13 are prepared, and the respective demodulation results are compared in, for example, a carrier unit to perform selection diversity or combination diversity processing. Thus, the anti-jamming characteristics can be improved.
[0044]
Further, in the above embodiment, the case where the digital broadcast wave from the preceding stage is relay-transmitted by TTL or OFDM has been described, but the relay transmission device according to the present invention is also used for connection to a CATV (cable television) broadcast system. be able to.
[0045]
That is, in the CATV broadcasting service, it is planned to receive terrestrial digital broadcasting and retransmit it to one of its own broadcasting channels. In such a case, as shown in FIG. 4, the relay transmission device 25 according to the present invention is installed in a CATV station and connected to a modulator 26 that performs modulation for transmission on a predetermined cable broadcast channel.
[0046]
The relay transmission device 25 shown in FIG. 4 is roughly divided into a reception processing unit and a transmission processing unit.
[0047]
In the reception processing unit, a reception signal received by the reception antenna 251 is tuned by the tuner unit 252 to obtain an OFDM signal in an IF band (hereinafter, OFDM-IF signal), and is supplied to the demodulation unit 253. The demodulation unit 253 demodulates a digital broadcast signal by performing FFT (Fast Fourier Transform) processing on the OFDM-IF signal.
[0048]
The digital broadcast signal obtained by this demodulation processing is divided into two parts: a TS signal that is a broadcast content of a program or the like, and a TMCC (Transmission and Multiplexing Configuration Control) signal and an AC (Auxiliary Channel) signal that are broadcast transmission control signals. And supplied to the respective decoding units 254 and 255.
[0049]
The TS signal is supplied to the TS decoding unit 254, and decoding including error correction is performed. As a result, data damaged by noise or fading during transmission is restored. Further, the TS decoding section 254 regenerates hierarchical information that is not directly included in the TS signal (broadcast wave) from the transmission pattern of the TS or the like and supplies the generated information to the multiplexing processing section 257. The TS signal itself is supplied to the PSI / SI rewrite processing unit 256, and PSI (transmission control information) / SI (program information) including NIT (Network Information Table) and TOT (Time Offset Table) are transmitted to the cable television. Rewrite according to the broadcast format. After the processing, it is supplied to the multiplex processing unit 257. In addition, when performing hierarchical transmission, it is possible to select a time interval length having a different delay time for each layer. In such a case, processing according to the time difference for each layer is performed.
[0050]
On the other hand, the TMCC signal and the AC signal are subjected to decoding processing including error correction by a decoding unit 255 different from the TS signal, and are supplied to the multiplexing processing unit 257.
[0051]
The multiplexing processing unit 257 performs time-division multiplexing of the reconfigured TS signal, TMCC signal, AC signal, and control information to reconfigure to a 32.5 Mbps broadcast TS. At this time, the 8.13 MHz reference clock and frame pulse are reproduced from the received broadcast wave, and sent to the CATV transmitter 258 together with the reconstructed broadcast TS. The 8.13 MHz reference clock may be transmitted after being converted to another frequency such as 10 MHz depending on the CATV transmission device.
[0052]
The CATV transmitting apparatus 258 receives a broadcasting TS, a reference clock, and a frame pulse, modulates the signal by the OFDM method similar to the terrestrial digital broadcasting, converts the frequency to a channel used by the CATV, and transmits the signal via a cable. To each recipient's home. At this time, at each receiver's house, a terrestrial digital broadcast by cable transmission can be received by using a receiver common to the terrestrial digital broadcast in which the reception channel is extended to a frequency band for CATV.
[0053]
Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying constituent elements in an implementation stage without departing from the scope of the invention. Various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the above embodiments. For example, some components may be deleted from all the components shown in the embodiment. Further, components of different embodiments may be appropriately combined.
[0054]
【The invention's effect】
As described above, according to the present invention, a terrestrial digital broadcast reception processing device capable of reconstructing a terrestrial digital broadcast signal at a receiving point, and using this device to avoid multi-stage connection by another line such as a micro line A terrestrial digital broadcast relay transmission device and a relay transmission method capable of relay transmission while maintaining signal quality, a broadcast information recording device capable of recording all broadcast contents at a reception point using the reception processing device, Can provide a terrestrial digital broadcast relay transmission apparatus and a relay transmission method corresponding to relay transmission to cable television broadcasting.
[Brief description of the drawings]
FIG. 1 is a block diagram showing the configuration of a terrestrial digital broadcast relay system according to an embodiment of the present invention.
FIG. 2 is a block diagram showing a configuration of a relay transmission device according to the present invention arranged in an intermediate relay station in the embodiment.
FIG. 3 is a block diagram showing a configuration of a receiving system used in a relay transmission device as another embodiment of the present invention.
FIG. 4 is a block diagram showing a configuration of a terrestrial digital broadcast relay transmission apparatus corresponding to relay transmission to CATV broadcast as another embodiment of the present invention.
[Explanation of symbols]
A: Tokyo Tower B ... Kiryu Relay Station C ... Maebashi Relay Station 11 ... Receiving Antenna 12 ... Tuner Unit 13 ... Demodulation Unit 14 ... TS Signal Decoding Unit 15 ... TMCC / AC Decoding Unit 16 ... TOT Rewriting Processing Unit 17 ... Multiplexing Processing Unit 18: TTL transmitting device 19: OFDM modulation / transmitting device 20: Broadcast signal recording device 21: TTL transmitting antenna 22 ... OFDM transmitting antenna 23 ... IF receiving antenna 24 ... IF-TTL receiving device 25 ... CATV broadcast compatible relay transmitting device 251 ... Receiving antenna 252 Tuner section 253 Demodulation section 254 TS signal decoding section 255 TMCC / AC decoding section 256 PSI / SI rewriting processing section 257 Multiplexing processing section 258 CATV broadcast transmitter

Claims (18)

A receiver for selectively receiving terrestrial digital broadcast waves of a specific channel;
A demodulation unit for demodulating a digital broadcast signal from a reception signal of the reception unit;
An error correction processing unit for performing error correction on the output of the demodulation unit;
A terrestrial digital broadcast reception processing device, comprising: a reconfiguration processing unit configured to reconfigure the signal transmission format of the digital broadcast signal output from the error correction processing unit including control information. When the terrestrial digital broadcast wave is an OFDM (Orthogonal Frequency Division Multiplex) system and a guard interval length is selectively determined from a plurality of modes,
2. The terrestrial digital broadcast according to claim 1, wherein the receiving unit includes mode search means for searching for a mode of the guard interval length, and performs switching control of synchronous reproduction processing based on a search result of the mode search means. Reception processing device. 2. The terrestrial digital broadcast reception processing device according to claim 1, wherein the reconfiguration processing unit corrects time-related information in the control information corresponding to a time required for relay transmission. The reconfiguration processing unit separates and reproduces control information and a TS (Transport Stream) from the digital broadcast signal, multiplexes the control information with a TS reproduced signal after rewriting the control information, and reconstructs the broadcast signal in a TS format. The terrestrial digital broadcast reception processing device according to claim 1. 5. The terrestrial digital broadcast reception processing device according to claim 4, wherein when the digital broadcast signal has hierarchical information, the reconfiguration processing unit separates the hierarchical information and multiplexes the hierarchical information into the TS reproduction signal. 2. The terrestrial digital system according to claim 1, wherein the reconstruction processing unit corrects transmission control information and program information including network-related information and time-related information in the control information in accordance with a broadcast format of an output destination. Broadcast reception processing device. A terrestrial digital broadcast reception processing device according to any one of claims 1 to 5,
A terrestrial digital broadcast relay, comprising: a transmission device that converts a terrestrial digital broadcast signal reconstructed by the reception processing device into a TTL (Transmitter to Transmitter Link) wave and transmits the converted terrestrial digital broadcast signal. Transmission equipment. A terrestrial digital broadcast reception processing device according to any one of claims 1 to 5,
A terrestrial digital broadcast signal reconstructed by the reception processing device, and a transmission device for converting the terrestrial digital broadcast signal into an OFDM (Orthogonal Frequency Division Multiplex) signal of an arbitrary broadcast channel and transmitting the signal. Digital broadcast relay transmission device. A receiver for selectively receiving a terrestrial digital broadcast wave of a specific channel, a demodulator for demodulating a digital broadcast signal from a signal received by the receiver, an error correction processor for performing error correction on an output of the demodulator, and A terrestrial digital broadcast reception processing device including a reconfiguration processing unit that reconfigures the signal transmission format of the digital broadcast signal output from the correction processing unit, including the control information,
A transmission device for transmitting a terrestrial digital broadcast signal reconstructed by the reception processing device as a cable television broadcasting TS (Transport Stream);
The terrestrial digital broadcast relay transmission device, wherein the reconstruction processing unit corrects transmission control information and program information including network-related information and time-related information in the control information in accordance with a form of cable television broadcasting. . A terrestrial digital broadcast reception processing device according to any one of claims 1 to 6,
A recording device for recording all information of the terrestrial digital broadcast signal reconstructed by the reception processing device. After directly receiving a terrestrial digital broadcast wave, demodulating a digital broadcast signal, correcting an error, and reconstructing a signal transmission format including control information, a TTL (Transmitter to Transmitter Link: wireless link between transmission stations) A terrestrial digital broadcasting relay transmission method, characterized in that it is converted into a wave and transmitted. After directly receiving terrestrial digital broadcast waves, demodulating digital broadcast signals, correcting errors, and reconstructing a signal transmission format including control information, an OFDM (Orthogonal Frequency Division Multiplex) system is used. A terrestrial digital broadcast relay transmission method, characterized in that it is converted into a broadcast wave and transmitted. A digital terrestrial broadcast wave is directly received, a digital broadcast signal is demodulated, an error is corrected, and a signal transmission format including control information is reconfigured into a signal transmission format for cable television broadcasting, so that a cable television broadcasting TS (Transport Stream) is provided. A terrestrial digital broadcast relay transmission method, characterized in that: When the terrestrial digital broadcast wave is an OFDM (Orthogonal Frequency Division Multiplex) system and a guard interval length is selectively determined from a plurality of modes,
14. The terrestrial digital broadcast system according to claim 11, wherein a mode of the guard interval length is searched for when the terrestrial digital broadcast wave is received, and switching control of synchronous reproduction processing is performed based on the mode search result. Digital broadcast relay transmission method. 14. The terrestrial digital broadcast relay transmission method according to claim 11, wherein the reconfiguration process corrects time-related information in the control information corresponding to a time required for relay transmission. 12. The digital broadcast signal, wherein control information and a TS (Transport Stream) are separated and reproduced, and after rewriting the control information, multiplexed with a TS reproduction signal to reconstruct a TS format broadcast signal. 14. A method for relaying and transmitting digital terrestrial broadcasting according to any one of claims 13 to 13. 17. The terrestrial digital broadcast relay transmission method according to claim 16, wherein when hierarchical information is included in the digital broadcast signal, the hierarchical information is separated and multiplexed with the TS reproduction signal. 14. The ground according to claim 13, wherein in the reconfiguration processing, transmission control information and program information including network-related information and time-related information in the control information are corrected in accordance with a broadcast form of an output destination. Digital broadcast relay transmission method.

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