WO2008075562A1

WO2008075562A1 - Ground digital broadcast retransmission device

Info

Publication number: WO2008075562A1
Application number: PCT/JP2007/073513
Authority: WO
Inventors: Yoshikazu Narikiyo; Masahiro Okano; Kenichi Tsuchida; Masayuki Takada; Kazuhiko Shibuya
Original assignee: Nippon Hoso Kyokai
Priority date: 2006-12-18
Filing date: 2007-12-05
Publication date: 2008-06-26
Also published as: AR064378A1; CL2007003663A1; BRPI0717164A2; MY146881A; SG161284A1; PE20081091A1; BRPI0717164B1; JP4425267B2; JP2008153958A

Abstract

Provided is a retransmission device for broadcast to a portable/mobile device which has a short delay time without allocating an unnecessary frequency and can be realized as a small-size device. The retransmission device (1) of the ground digital broadcast includes; N tuner units (200); N digital processing units (311); an addition circuit (400); and a retransmission unit (500). Each of the tuner units (200) selects one channel from a plurality of received channels of the ground digital broadcast waves and outputs a base band signal equivalent to the channel. Each of the digital processing units (311) extracts only a partial reception portion from 13 segments of the equivalent base band signal by an LPF circuit (301) and arranges it on a segment upon concatenation by a segment arrangement circuit (302). An addition circuit (400) inputs an equivalent base band signal of the partial reception portion from each of the digital processing units (311) and adds and combines them so as to transmit the obtained result as a ground digital broadcast wave of the one channel via the retransmission unit (500).

Description

Specification

Terrestrial digital broadcast retransmitter

Technical field

The present invention relates to a retransmission apparatus for terrestrial digital broadcast, and relates to a retransmission apparatus for receiving a segment of a partial reception unit of terrestrial digital television transmission or a terrestrial digital audio broadcast and retransmitting the received signal. .

Background art

[0002] Terrestrial digital television broadcasting in Japan adopts the ISDB-T (Integrated Services Digit Broadcasting-Terrestrial) method and the Orthogonal Frequenc y Division Multiplex (OFDM) modulation method, and has 13 segments. Broadcast transmission data as (total bandwidth 6 MHz)!

[0003] Televisions provided in the home receive these 13 segments in a batch by means of fixed antennas, but in the case of broadcasting for mobile phones, such as mobile phones and PDAs (Personal Digital Assistants), this 13 Receives only the middle one of the segments, so-called partial reception.

[0004] Here, the mobile and mobile broadcast segments need to be able to receive well in outdoor buildings, in buildings, in underground malls, etc. A retransmitter is needed to retransmit the

Conventionally, the following four methods are known as a method of retransmitting terrestrial digital broadcast. That is, the first retransmission method is realized by a single frequency network in which signals of the same content are transmitted from multiple transmitting stations or relay stations using the same frequency when retransmitting all 13 segments. (See, for example, Patent Documents 1, 2, and 3). The second retransmission method is realized by a dual frequency network that performs frequency conversion on the received signal received by the relay station and retransmits on a frequency other than the reception frequency when retransmitting all 13 segments. (See, for example, Non-Patent Document 1).

[0006] In addition, the third retransmission method is to construct a network that performs only partial reception, extract only the partial reception unit with a filter, and retransmit only the partial reception unit (eg, See, for example, Patent Document 4). In the fourth retransmission method, by constructing a network that performs only partial reception, only the partial reception unit is extracted with a filter, Fourier transformation is performed, and a plurality of segments are connected by processing in the frequency domain to re-execute. Send (see, for example, Patent Document 5).

Patent Document 1: Japanese Patent Application Laid-Open No. 10-75262

Patent Document 2: Japanese Patent Application Laid-Open No. 10-75263

Patent Document 3: Japanese Patent Application Laid-Open No. 10-28105

Patent Document 4: Japanese Patent Application Laid-Open No. 2005-341195

Patent Document 5: Japanese Patent Application Laid-Open No. 2006-109283

Non-patent literature 1: Aiichiro Taketake et al., "Study on 1-frequency digital terrestrial broadcasting relay by OFDM", Proceedings of the 1995 Annual Conference of the Television Society, p. 277-p. 278

Disclosure of the invention

Problem that invention tries to solve

[0008] The first and second retransmission methods described above retransmit transmission data of the entire 13 segments using a bandwidth of 6 MHz per channel in the case of digital terrestrial television broadcasting. However, with this retransmission method, it is sufficient to retransmit only one segment of the partial reception unit, even when retransmitting to an outdoor building behind a building, in a building, in an underground mall, etc., for mobile and mobile objects. Nevertheless, the entire 13 Mhz signal bandwidth of 6 MHz per channel must be retransmitted. For example, when retransmitting eight channels by two frequencies, it is necessary to secure a bandwidth of 48 MHz (6 MHz x 8 channels) for eight channels. In this case, there is a problem that it is difficult to secure such a band because the current domestic transmission allocation frequencies are crowded.

Further, the third retransmission method described above is to extract only the partial reception unit and retransmit the power. Since the band to be retransmitted is 6 MHz per channel, in the case of 8 channels, 48 MHz is finally obtained. There is a problem similar to the first and second retransmission methods described above in that the bandwidth is required. In addition, there is also a problem that there is a possibility that the characteristics of fixed reception near the retransmission point may be degraded.

[0010] Moreover, the fourth retransmission method described above concatenates and retransmits a plurality of segments. The power S, which requires processing in the frequency domain, is to be subjected to Fourier transform and inverse Fourier transform, and the delay time from signal reception to retransmission is increased, and the circuit size is also increased. There was a problem that.

Therefore, the present invention has been made to solve the problem of power, and the purpose thereof is to shorten the delay time that can not be assigned unnecessary frequency in the terrestrial digital broadcast re-transmission device. The aim is to provide a mobile and mobile broadcast retransmitter that can be miniaturized.

Means to solve the problem

[0012] In order to solve the above problems, the terrestrial digital broadcast retransmitter according to the present invention extracts only partial receivers of terrestrial digital broadcast waves with a filter, and performs digital terrestrial processing in the time domain only by using a plurality of terrestrial digital broadcasts. The partial receiver of the wave is connected to each adjacent segment and retransmitted as one terrestrial digital broadcast wave. This makes it possible to retransmit with less bandwidth than performing Fourier transform or inverse Fourier transform.

That is, the terrestrial digital broadcast retransmission apparatus according to the present invention receives a plurality of terrestrial digital broadcasts composed of a plurality of segments, extracts one segment from each of these terrestrial digital broadcast waves, and A plurality of digital processing units each corresponding to a part of a plurality of tuners, a part of a plurality of tuners, and a part of a plurality of tuners in a terrestrial digital broadcast retransmitting apparatus that combines extracted segments and retransmits as terrestrial digital broadcast waves. , Adding part, and re-transmitting part, the tuner part selects one broadcast wave of the plurality of received terrestrial digital broadcast waves, and transmits the signal of RF band of this broadcast wave in the IF band. Reception conversion means for converting into a signal, AD conversion means for converting the IF signal converted by the reception conversion means into a digital IF signal, and digital signals converted by the AD conversion means And quadrature demodulation means for performing quadrature demodulation on the IF signal and outputting an equivalent baseband signal, and the digital processing unit is configured to generate one segment from the equivalent baseband signal output by the quadrature demodulation means of the tuner part. Filter means for extracting the signal, and segment arrangement means for frequency converting the equivalent baseband signal of one segment extracted by the filter means to a position for connecting a plurality of segments, and the addition unit , One set of each frequency-converted by the segment arrangement unit of the plurality of digital processing units. A quadrature modulation unit that performs quadrature modulation on the equivalent baseband signal added and combined by the adding unit, and outputs a digital IF signal; DA conversion means for converting the digital IF signal output by the quadrature modulation means into an analog IF signal, and RF band for retransmitting the analog IF signal converted by the DA conversion means as a terrestrial digital broadcast wave And transmitting and converting means for converting the signals into signals and amplifying the converted signals.

Effect of the invention

As described above, according to the present invention, it is possible to realize a retransmission apparatus capable of achieving a short delay time and a reduction in size, which can not be used for frequency allocation, in a retransmission apparatus for digital terrestrial broadcasting. it can.

Brief description of the drawings

FIG. 1 is a block diagram showing a configuration (example 1) of a terrestrial digital broadcast retransmission apparatus according to an embodiment of the present invention.

FIG. 2 is a diagram showing the configuration and numbers of segments in the ISDB-T system.

FIG. 3 is a diagram showing an example of the configuration of a reception channel and a transmission channel.

FIG. 4 is a block diagram showing a configuration (example 2) of a retransmission apparatus for terrestrial digital broadcast according to an embodiment of the present invention.

FIG. 5 is a diagram for explaining the processing of the GI replacement circuit of FIG. 4;

FIG. 6 is a block diagram showing the configuration of a terrestrial digital broadcast retransmitter according to an embodiment of the present invention (Example 3).

FIG. 7 is a block diagram showing the configuration of a terrestrial digital broadcast retransmitter according to an embodiment of the present invention (Example 4).

FIG. 8 is a pattern diagram showing the arrangement of SP.

FIG. 9 is a block diagram showing the configuration of a terrestrial digital broadcast retransmission apparatus according to an embodiment of the present invention (Example 5).

FIG. 10 is a block diagram showing a configuration (example 6) of a terrestrial digital broadcast retransmission apparatus according to an embodiment of the present invention.

[FIG. 11] Configuration of terrestrial digital broadcast retransmitting apparatus according to an embodiment of the present invention (Example 7) ) Is a block diagram showing FIG.

FIG. 12 is a block diagram showing a configuration (example 8) of a terrestrial digital broadcast retransmission apparatus according to an embodiment of the present invention.

FIG. 13 is a block diagram showing a configuration (example 9) of a terrestrial digital broadcast retransmission apparatus according to an embodiment of the present invention.

FIG. 14 is a block diagram showing a configuration (Example 10) of a terrestrial digital broadcast retransmission apparatus according to an embodiment of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings. The embodiment of the present invention will be described by taking a re-transmission apparatus for receiving and re-transmitting digital terrestrial television broadcasting as an example.

[0017] FIG. 2 is a diagram showing the configuration and numbers of ISDB-T segment. In the ISDB-T scheme, the 5600 or more subcarriers that constitute an OFDM signal are divided into 13 groups, and each one is referred to as a segment. The segments are distinguished by segment numbers 0 to 12; segment 0 is a segment of the partial reception unit, and data for mobile's mobile broadcasting is allocated. These 13 segments correspond to one channel, and the bandwidth is 6 MHz. The broadcaster is allocated one channel of 6 MHz bandwidth consisting of 13 segments, and each broadcaster broadcasts the ISDB-T OFDM signal in the allocated one channel.

[0018] FIG. 3 is a diagram showing an example of concatenating each one-segment portion of eight channels as a configuration example of a reception channel and a transmission channel in a terrestrial digital broadcast retransmitter. As shown in Fig. 3, one of eight channels (UHF13, 14, 15, 16, 17, 18, 19, 20, 20 channels) and one channel are allocated to a plurality of broadcasters. I assume. The terrestrial digital broadcast retransmitter receives the plurality of terrestrial digital broadcast waves, extracts the partial reception unit of segment number 0 from the respective terrestrial digital broadcast waves, and connects and connects the respective partial reception units. It is a device that transmits a signal as a retransmitted signal on a vacant RF signal, for example, UHF 53ch.

Hereinafter, the re-transmission apparatus for digital terrestrial broadcasting will be described more specifically by the embodiments; Light up. The terrestrial digital broadcast retransmitting apparatus according to the first embodiment is to receive digital terrestrial television broadcasts without performing Fourier transform for each channel system, and connect and retransmit the extracted individual component receiving units. . The terrestrial digital broadcast retransmission apparatus according to the second embodiment performs reception processing without performing Fourier transform for each channel as in the first embodiment, but GI (Guard Interval) is attached to each extracted partial reception unit. Change and retransmit. The terrestrial digital broadcast retransmitting apparatus according to the third embodiment is configured to retransmit each extracted partial receiving section in synchronization with each symbol timing. The terrestrial digital broadcast retransmitting apparatus according to the fourth embodiment is for receiving to each extracted partial reception unit. The terrestrial digital broadcast retransmitting apparatus according to the fifth embodiment is configured to retransmit each of the extracted respective section receiving sections in synchronization with each other. According to the embodiments 6 to 10, the retransmitter of the terrestrial digital broadcast according to the embodiment 10 adds the TS (Transport Stream) signal which is uniquely generated separately from the terrestrial digital television broadcast and transmits it together with the terrestrial digital television broadcast. And each use the method of! To 5 examples.

Example 1

First, the first embodiment will be described. FIG. 1 is a block diagram showing a configuration (Example 1) of a terrestrial digital broadcast re-transmission apparatus according to an embodiment of the present invention. The retransmission apparatus 1 includes a receiving antenna unit 100, N tuner parts 200 (200-1, 200-2, 2,..., 200 N), N digital data processing units 311 (311-1, 311- 2, · · ·, 311—N), Caro calculation circuit 400, Retransmission unit 500, and Transmission antenna unit 600. Note that since the tuner part 200 and the digital processing unit 311 are configured by N systems, and the respective systems are configured by the same circuit, only one system will be described below. Further, the tuner part 200 is composed of a reception conversion circuit 201, an AD conversion circuit 202 and an orthogonal demodulation circuit 203, and the digital processing part 311 is composed of an LPF (Low Pass Filter) circuit 301 and a segment placement circuit 302. The retransmission unit 500 is composed of an orthogonal modulation circuit 501, a DA conversion circuit 502, and a transmission conversion circuit 503. Note that N≤13 (the same applies below).

Terrestrial digital broadcasting received by receiving antenna unit 100 is divided by a distributor (not shown). It is distributed to the number of terrestrial digital broadcast waves (N waves). When an RF signal that is a terrestrial digital broadcast to which the tuner part 200 is distributed is input, the reception conversion circuit 201 of the tuner part 200 uses the input RF signal once at an intermediate frequency (for example, in a home receiver) After converting it to 57 MHz, and passing it through a surface acoustic wave (SAW) filter, it converts the frequency again to a low frequency (for example, 4 MHz, which is half of the Fast Fourier Transform (FFT) frequency). As a result, only channels set in advance for each system are selected.

The AD conversion circuit 202 inputs the signal frequency-converted by the reception conversion circuit 201, and A / D converts it into a digital signal at a sampling frequency (for example, 16 MHz which is twice the FFT frequency). The quadrature demodulation circuit 203 receives the digital signal A / D converted by the AD conversion circuit 202, quadrature demodulates it, and converts it into an equivalent baseband signal.

The LPF circuit 301 of the digital processing unit 311 receives the equivalent baseband signal converted by the orthogonal demodulation circuit 203, and extracts only the signal of the one-segment part (partial reception unit) by filter processing. The segment arrangement circuit 302 receives the signal of the one-segment portion extracted by the LPF circuit 301, and performs frequency conversion to a segment arranged when connecting to one equivalent baseband signal.

Adder circuit 400 receives the equivalent baseband signal of the one-segment portion digitally processed by N-system digital processing unit 311, and adds and combines these equivalent baseband signals.

Quadrature modulation circuit 501 of retransmission section 500 receives the equivalent baseband signal added and combined by addition circuit 400, and performs quadrature modulation to convert it. The D / A conversion circuit 502 inputs the digital signal converted by the quadrature modulation circuit 501, and uses the same sampling frequency as the A / D conversion circuit 202 (for example, 16 MHz which is 4 times 4 MHz). / A convert to generate a low frequency (for example, 4 MHz) signal. The transmission conversion circuit 503 receives the low frequency signal D / A converted by the D / A conversion circuit 502, once performs frequency conversion to an intermediate frequency (for example, the frequency 37.15 MHz of the IF signal), and retransmits it. The frequency is converted to an RF signal again and amplified to a desired transmission power. The RF signal frequency-converted and amplified by the transmission conversion circuit 503 in this way is retransmitted via the transmission antenna unit 600. Believed.

As described above, according to the terrestrial digital broadcast retransmission apparatus 1 of the first embodiment, only the partial reception unit, which is a mobile-mobile service broadcast of terrestrial digital broadcast, is extracted using a filter, and Fourier transform is performed. And by digital processing only in the time domain that does not perform inverse Fourier transform, partial reception units of multiple terrestrial digital broadcast waves are connected to adjacent segments and retransmitted as one RF signal. As a result, it is possible to retransmit in a small bandwidth (1 channel = 6 MHz) to a receiving apparatus outside a building, inside a building, in an underground mall or the like without assigning unnecessary frequencies. Further, since it is unnecessary to carry out the Fourier transform and the inverse Fourier transform on the data of the main line system to be retransmitted, the delay time can be shortened and the miniaturization can be simplified.

Example 2

Next, Example 2 will be described. The second embodiment eliminates the error of the frequency component due to the jitter contained in the local frequency when the reception conversion circuit 201 performs the frequency conversion, and prevents the inter-carrier interference in the addition circuit 400 and the LPF circuit 301. To remove distortion of the signal caused by the filtering process.

FIG. 4 is a block diagram showing a configuration (example 2) of a terrestrial digital broadcast re-transmission apparatus according to an embodiment of the present invention. The retransmission apparatus 2 includes a reception antenna unit 100 (not shown), N tuner parts 200, N digital processing units 312, an adder circuit 400, a retransmission unit 500, and a transmission antenna unit 600 (see FIG. Not shown). The digital processing unit 312 is configured by N systems, and since each system is configured by the same circuit, only one system will be described below. Also, the digital processing unit 312 includes an LPF circuit 301, a frequency error correction circuit 303, a symbol synchronization detection circuit 304, a GI replacement circuit 305, and a segment arrangement circuit 302. Comparing the retransmission apparatus 1 according to the first embodiment shown in FIG. 1 with the retransmission apparatus 2, the receiving antenna unit 100, the tuner part 200, the addition circuit 400, the retransmission unit 500, and the transmission in both apparatuses are compared. The digital processing unit 312 of the force retransmission apparatus 2 which is the same as that of the antenna section 600 includes the frequency error correction circuit 303 and the symbol synchronization detection circuit 304 in addition to the configuration of the digital processing unit 311 of the retransmission apparatus 1. And GI replacement circuit 305 is different. Hereinafter, in FIG. 4, the same parts as FIG. 1 are shown. The same reference numerals as in 1 are attached and the detailed description is omitted.

When the digital processing unit 312 inputs the equivalent baseband signal of the channel selected by the tuner part 200, the LPF circuit 301 extracts only the signal of the one segment part (partial reception part) by filter processing. The output of the LPF circuit 301 is divided into two, one of which is input to the frequency error correction circuit 303, and the other to the symbol synchronization detection circuit 304.

The symbol synchronization detection circuit 304 receives the signal of the one segment portion extracted by the LPF circuit 301, detects the frequency error amount of the signal of the one segment portion and the head position of the symbol, and corrects the frequency error amount as frequency error correction. It is output to the circuit 303, and the head position information of the symbol is output to the GI replacement circuit 305.

An example of detecting symbol synchronization is shown below. In general, an OFDM symbol is composed of a guard period and an effective symbol period, and a signal of the guard period is cyclically copied from a part behind the effective symbol. The symbol synchronization detection circuit 304 uses this configuration to determine a guard correlation, and detects the frequency error amount and the head position of the symbol. Specifically, the input signal (a signal consisting of a guard period and an effective symbol period) and a signal obtained by delaying this input signal by the effective symbol period are multiplied, and these signals are multiplied. The guard correlation of both signals is determined by determining the moving average of the guard period width. Then, a point where the obtained guard correlation value reaches a peak is detected as the symbol boundary (ie, the top position of the symbol). Also, the correlation (Sii) between the I axis data of the input signal (equivalent baseband signal) and the I axis data delayed by the effective symbol period (Sii), and the I axis data of the input signal delayed by the effective symbol period The correlation (Siq) with the Q axis data is determined respectively, and the frequency error amount is detected based on these correlation values. For details of the detection method of the symbol head position and the amount of frequency error, see “Seki Takafumi et al.,“ Examination of a new frequency synchronization method using guard period in OFDM ”, Technical Report of the Institute of Television Engineers, August 1995 Please refer to the 24th.

Frequency error correction circuit 303 receives the signal of the one-segment portion from LPF circuit 301, receives the frequency error amount from symbol synchronization detection circuit 304, and receives the frequency error of the input one-segment signal. Make corrections using the amount of error. In the reception conversion circuit 201, since jitter is included in the local frequency used when performing frequency conversion, An error may occur in the frequency components, and the addition circuit 400 may cause inter-carrier interference when combining the signals of the one segment of each channel. This frequency error correction circuit 303 can prevent inter-carrier interference due to frequency component error in frequency conversion.

GI replacement circuit 305 receives the corrected one-segment signal from frequency error correction circuit 303, receives symbol head position information from symbol synchronization detection circuit 304, and applies the input one-segment signal. Then, based on the input symbol head position information, a signal of 1 symbol length is extracted and GI replacement is performed.

FIG. 5 is a diagram for explaining the process of the GI replacement circuit 305. GI replacement circuit 305 uses the fact that the signal of the guard period of the OFDM symbol composed of the guard period and the effective symbol period is copied to the back of the effective symbol, and is used for the input one segment signal. On the other hand, distortion of the head portion of a signal of 1 symbol length is eliminated by the following processing. First, GI replacement circuit 305 specifies the symbol head position based on the input symbol head position information (1), and extracts a signal of effective symbol length starting from the position of GI / 2 from there (see (1)). 2). Then, the signals between the beginning of the extracted effective symbol length signal and the G 1/2 position are arranged at the rear and rearranged (3), and the rearranged signals are arranged according to the GI ratio set in advance. Add the rear to the top as GI (4). In this way, a new signal of one symbol length is obtained. In the LPF circuit 301, distortion may occur at the beginning and the end of the one symbol length due to the filtering process. This GI replacement circuit 305 can remove signal distortion caused by filtering.

Returning to FIG. 4, the segment arrangement circuit 302 receives the signal of the one-segment portion whose GI has been replaced by the GI replacement circuit 305, and is placed when being coupled to one equivalent baseband signal. Perform frequency conversion to segments.

As described above, according to the terrestrial digital broadcast retransmitting apparatus 2 of the second embodiment, the second embodiment

Force S to get the same effect as 1 Further, the frequency error correction circuit 303 eliminates the error of the frequency component caused by the jitter contained in the local frequency when the reception conversion circuit 201 performs frequency conversion, and prevents the inter-carrier interference in the addition circuit 400. Can. Also, the signal generated by the filtering process of the LPF circuit 301 by the GI replacement circuit 305 It is possible to remove distortion at the head and back of one symbol length of. As a result, in the receiving apparatus that receives the retransmission signal from the retransmission apparatus 2, the accuracy of symbol synchronization is improved, the frequency error correction amount becomes accurate, and degradation in the retransmission apparatus 2 can be reduced.

Example 3

Next, the third embodiment will be described. The third embodiment eliminates the error of the frequency component caused by the jitter contained in the local frequency when the reception conversion circuit 201 performs the frequency conversion, prevents the inter-carrier interference in the addition circuit 400, and It retransmits the signal of the one segment part at the symbol timing.

FIG. 6 is a block diagram showing a configuration (example 3) of a terrestrial digital broadcast re-transmission apparatus according to an embodiment of the present invention. The retransmission apparatus 3 includes a reception antenna unit 100 (not shown), N tuner parts 200, N digital processing units 313, a delay time adjustment circuit 307-3, an adder circuit 400, a retransmission unit 500, And a transmitting antenna unit 600 (not shown). The digital processing unit 313 is configured by N systems, and since each system is configured by the same circuit, only one system will be described below. The digital processing unit 313 includes an LPF circuit 301, a frequency error correction circuit 303, a symbol synchronization detection circuit 304, a digital delay circuit 306, and a segment arrangement circuit 302. Comparing the retransmission apparatus 2 of the second embodiment shown in FIG. 4 with this retransmission apparatus 3, the receiving antenna unit 100, the tuner part 200, the adder circuit 400, the retransmission unit 500, and the transmission antenna of both apparatuses are compared. Although the digital processing unit 313 of the retransmission apparatus 3 has the same configuration as the digital processing unit 312 of the retransmission apparatus 2, the retransmission apparatus 3 further includes a delay unit 600. The difference is that the time adjustment circuit 307-3 is provided. Hereinafter, in FIG. 6, the same parts as in FIG. 4 will be assigned the same reference numerals as in FIG. 4 and detailed explanations thereof will be omitted.

The symbol synchronization detection circuit 304 receives the signal of the one-segment portion extracted by the LPF circuit 301, detects the frequency error amount of the signal of the one-segment portion and the head position of the symbol by guard correlation, and calculates the frequency error amount. It is output to the frequency error correction circuit 303, and the top position information of the symbol is output to the delay time adjustment circuit 307-3.

[0040] The delay time adjustment circuit 307-3 is a symbol of each of the digital processing units 313-; Each head of the symbol detection circuit 304 receives the head position information of the symbol, and based on the reception timing of any equivalent base band signal, each head of the equivalent base band signal of each channel is made to coincide with each other. Calculate the delay time of

Digital delay circuit 306 of each system receives the one-segment signal whose frequency error has been corrected by frequency error correction circuit 303, and inputs the delay time calculated by delay time adjustment circuit 307-3. The error corrected signal is delayed by the delay time. Since the tuner processing by the tuner part 200 and the digital processing by the digital processing unit 313 are performed for each channel, there is a possibility that the symbol timing of each channel may be deviated. By the digital delay circuit 306 and the delay time adjustment circuit 307-3, it is possible to adjust the symbol timing of the signal of the segment of each system.

The segment arrangement circuit 302 receives the signal of the one-segment portion delayed by the digital delay circuit 306, and performs frequency conversion to a segment arranged when connecting to one equivalent baseband signal.

As described above, according to the terrestrial digital broadcast retransmitting apparatus 3 of the third embodiment, the same effect as that of the first embodiment can be obtained S. Further, the frequency error correction circuit 303 eliminates the error of the frequency component caused by the jitter contained in the local frequency when the reception conversion circuit 201 performs frequency conversion, and prevents the inter-carrier interference in the addition circuit 400. Can.

Further, by the digital delay circuit 306 and the delay time adjustment circuit 307-3, it is possible to adjust the symbol timing of the signal of the one segment part of each system. Since this makes it possible to align the symbol start positions of the equivalent baseband signals, when combining as one equivalent baseband signal in the adder circuit 400, the symbol synchronization timings of all 13 segments are aligned and retransmitted. It becomes possible. As a result, in the receiving apparatus that receives the retransmission signal from the retransmission apparatus 3, the accuracy of symbol synchronization is improved, and the frequency error correction amount becomes accurate.

Example 4

Next, the fourth embodiment will be described. This embodiment 4 eliminates the error of the frequency component due to the jitter contained in the local frequency when the reception conversion circuit 201 performs the frequency conversion, prevents the inter-carrier interference in the addition circuit 400, and One segment signal The symbol timings are retransmitted at the same timing so that the symbol start position of and the SP pattern match.

FIG. 7 is a block diagram showing a configuration (example 4) of a terrestrial digital broadcast re-transmission apparatus according to an embodiment of the present invention. The retransmission apparatus 4 includes a receiving antenna unit 100 (not shown), N tuner parts 200, N digital processing units 314, a delay time adjustment circuit 307-4, an adder circuit 400, a retransmission unit 500, And a transmitting antenna unit 600 (not shown). The digital processing unit 314 is configured by N systems, and since each system is configured by the same circuit, only one system will be described below. The digital processing unit 314 includes an LPF circuit 301, a frequency error correction circuit 303, a symbol synchronization detection circuit 304, an FFT circuit 308, an SP pattern detection circuit 309, a digital delay circuit 306, and a segment arrangement circuit 302. Comparing the retransmission apparatus 3 of the third embodiment shown in FIG. 6 with the retransmission apparatus 4, the receiving antenna unit 100, the tuner part 200, the adder circuit 400, the retransmission unit 500, and the transmission antenna unit are both devices. In addition to the configuration of the digital processing unit 313 of the retransmitting apparatus 3, the digital processing unit 314 of the force retransmitting apparatus 4 that is identical to the l /! Point 600 has an F FT circuit 308 and an SP pattern detection circuit 309. And the delay time adjustment circuit 307-4 having a configuration different from that of the delay time adjustment circuit 307-3 of the retransmission apparatus 3. Hereinafter, in FIG. 7, parts common to FIG. 6 will be assigned the same reference numerals as in FIG. 6, and detailed descriptions thereof will be omitted.

The symbol synchronization detection circuit 304 receives the signal of the one-segment portion extracted by the LPF circuit 301, detects the frequency error amount of the signal of the one-segment portion and the head position of the symbol by guard correlation, and calculates the frequency error amount. It is output to the frequency error correction circuit 303, and the top position information of the symbol is output to the delay time adjustment circuit 307-4. In addition, a timing signal indicating the start of the effective symbol period is generated for the signal of the one segment portion, and is output to the FFT circuit 308.

Frequency error correction circuit 303 receives the signal of the one segment from LPF circuit 301, receives the frequency error amount from symbol synchronization detection circuit 304, and uses the frequency error amount for the frequency error in the one segment signal. The corrected and frequency error-corrected one segment signal is output to the digital delay circuit 306 and the FFT circuit 308. The FFT circuit 308 receives the frequency error corrected signal of the one segment from the frequency error correction circuit 303, receives the timing signal of the effective symbol from the symbol synchronization detection circuit 304, and performs Fourier transform to obtain the time domain signal. Converts the signal of the effective symbol in the one segment part to the signal in the frequency domain.

The SP pattern detection circuit 309 receives the signal of the one-segment portion in the frequency domain from the FFT circuit 308, and determines which pattern among the SP arrangement patterns (all four patterns) of the ISDB-T system. To detect.

FIG. 8 is a pattern diagram showing the arrangement of SP. As shown in FIG. 8, four SP patterns 1 to 4 exist in the SP pattern of the ISDB-T method. The SP pattern detection circuit 309 detects any one of the four SP patterns 1 to 4 with respect to the input signal in the one-segment portion of the frequency domain.

The delay time adjustment circuit 307-4 receives the head position information of the symbol from the symbol synchronization detection circuit 304 of the digital processing unit 314 of each system, respectively, and receives the SP pattern from the SP pattern detection circuit 309. The information is input, and the delay time of each system is calculated based on the reception timing of any equivalent baseband signal so that the symbol start positions and the SP patterns of all equivalent baseband signals match.

The digital delay circuit 306 of each system receives the one-segment signal whose frequency error has been corrected by the frequency error correction circuit 303, and inputs the delay time calculated by the delay time adjustment circuit 307-4. The error corrected signal is delayed by the delay time. Since the tuner processing by the tuner part 200 and the digital processing by the digital processing unit 314 are performed for each channel, there is a possibility that the symbol timing of each channel may be deviated. By the digital delay circuit 306 and the delay time adjustment circuit 307-4, the symbol timing of the signal of the segment of each system is matched so that the start position of the symbol and the SP pattern coincide.

The segment placement circuit 302 receives the signal of the one-segment portion delayed by the digital delay circuit 306, and performs frequency conversion to a segment placed when connecting to one equivalent baseband signal.

As described above, according to the terrestrial digital broadcast retransmitter 4 of the fourth embodiment, the fourth embodiment is an embodiment of the present invention. Force S to get the same effect as 1 Further, the frequency error correction circuit 303 eliminates the error of the frequency component caused by the jitter contained in the local frequency when the reception conversion circuit 201 performs frequency conversion, and prevents the inter-carrier interference in the addition circuit 400. Can.

Further, by the digital delay circuit 306 and the delay time adjustment circuit 307-4, it is possible to match the symbol timing and the SP pattern of the signal of the one segment part of each system. As a result, when concatenated as one equivalent baseband signal in the adder circuit 400, it is possible to align the symbol synchronization timings of all 13 segments and align and retransmit SP patterns. As a result, in the receiver that receives the retransmission signal from the retransmission device 4, the symbol synchronization accuracy is improved, the frequency error correction amount is accurate, and the equalization processing is performed when the equalization processing is performed. It is possible to use SP.

Example 5

Next, Example 5 will be described. The fifth embodiment eliminates the error of the frequency component caused by the jitter contained in the local frequency when the reception conversion circuit 201 performs frequency conversion, prevents the inter-carrier interference in the addition circuit 400, and It retransmits the signal at the beginning of the frame by aligning it with the signal at the one segment segment.

FIG. 9 is a block diagram showing a configuration (Example 5) of a terrestrial digital broadcast re-transmission apparatus according to an embodiment of the present invention. The retransmission apparatus 5 includes a receiving antenna unit 100 (not shown), N tuner parts 200, N digital processing units 315, a delay time adjustment circuit 307-5, an adder circuit 400, a retransmission unit 500, And a transmitting antenna unit 600 (not shown). The digital processing unit 315 is configured by N systems, and since each system is configured by the same circuit, only one system will be described below. The digital processing unit 315 includes an LPF circuit 301, a frequency error correction circuit 303, a symbol synchronization detection circuit 304, an FFT circuit 308, a frame synchronization detection circuit 310, a digital delay circuit 306, and a segment arrangement circuit 302. Comparing the retransmission apparatus 4 of the fourth embodiment shown in FIG. 7 with this retransmission apparatus 5, the reception antenna unit 100, the tuner part 200, the adder circuit 400, the retransmission unit 500, and the transmission antenna unit are both devices. The digital processing unit 315 of the retransmission apparatus 5 is the same as the digital signal processing apparatus of the retransmission apparatus 5 except for the SP pattern detection circuit 309 in the digital processing unit 314 of the retransmission apparatus 4. The point it has, and The transmitting device 5 is different in that it includes a delay time adjusting circuit 307-5 having a configuration different from that of the delay time adjusting circuit 307-4 of the retransmission device 4. Hereinafter, in FIG. 9, the same parts as in FIG. 7 will be assigned the same reference numerals as in FIG. 7, and detailed descriptions thereof will be omitted.

Frame synchronization detection circuit 310 receives the signal of the one-segment portion in the frequency domain from FFT circuit 308, and transmits a signal from the TMCC (Transmission and Multiplexing Configuration Control) signal included in this ISDB-T system signal to the frame head position. Detect and demodulate. Then, the detected frame head position information is output to the delay time adjustment circuit 307-5. Here, since frame information is added to the TMCC signal of the ISDB-T system, it is possible to detect the frame head position by monitoring the TMCC signal.

The delay time adjustment circuit 307-5 receives the symbol head position information from the symbol synchronization detection circuit 304 of each system of the digital processing units 315-;!-N, and receives the frame head position information from the frame synchronization detection circuit 310. Are input, and the delay time of each system is calculated based on the reception timing of any equivalent baseband signal so that the symbol start position and frame start position of all equivalent baseband signals coincide.

The digital delay circuit 306 of each system receives the signal of the one segment portion whose frequency error has been corrected by the frequency error correction circuit 303, and inputs the delay time calculated by the delay time adjustment circuit 307-5. The error corrected signal is delayed by the delay time. Since the tuner processing by the tuner part 200 and the digital processing by the digital processing unit 315 are performed for each channel, there is a possibility that frame timing of each channel may be deviated. By the digital delay circuit 306 and the delay time adjustment circuit 307-5, it is possible to match the symbol timings of the signals of the segment of each system so that the frame start positions coincide with each other. In this case, when the frame start position matches, the symbol start position and the SP pattern also match.

As described above, according to the terrestrial digital broadcast retransmitting apparatus 5 of the fifth embodiment, the fifth embodiment

Force S to get the same effect as 1 Also, the frequency error correction circuit 303 When frequency conversion is performed by the conversion circuit 201, an error in frequency components caused by jitter contained in the local frequency can be eliminated, and inter-carrier interference in the addition circuit 400 can be prevented.

Further, by the digital delay circuit 306 and the delay time adjustment circuit 307-5, it is possible to adjust the frame top position of the signal of the one segment part of each system. Thereby, when concatenating as one equivalent baseband signal in addition circuit 400, it is possible to align the frame synchronization timing of all 13 segments, and also align and retransmit the symbol synchronization timing and the SP pattern. . As a result, in the receiving apparatus that receives the retransmission signal from the retransmission apparatus 5, the accuracy of symbol synchronization is improved, the frequency error correction amount becomes accurate, and when performing equalization processing, the adjacent segment is generated. It is possible to use the SP of

Yes

Example 6

A sixth embodiment will now be described. In this sixth embodiment, a TS signal uniquely generated separately from terrestrial digital television broadcasting is added using the method of the first embodiment, and is transmitted together with terrestrial digital television broadcasting. That is, signals of N partial receivers in N digital terrestrial digital broadcasting to be received and M unique TS signals are connected in one channel (band 6 MHz) and transmitted. Note that N + M≤13 (the same applies below).

FIG. 10 is a block diagram showing a configuration (example 6) of the terrestrial digital broadcast re-transmission apparatus according to the embodiment of the present invention. The retransmission apparatus 6 includes a reception antenna unit 100, N tuner parts 200, N digital processing units 311, M modulation units 721, an adder circuit 400, a retransmission unit 500, and a transmission antenna unit 600. Configured Here, since the modulation section 721 is configured by an M system, and each system is configured by the same circuit, only one system will be described below. The modulation unit 721 includes an OFDM modulation circuit 701, an OFDM framing processing circuit 702, an inverse Fourier transform circuit 703, a GI addition circuit 704, and a segment arrangement circuit 705. Comparing the retransmission apparatus 1 according to the first embodiment shown in FIG. 1 with the retransmission apparatus 6, the receiving antenna unit 100, the tuner part 200, the digital processing unit 311, the adder circuit 400, and the retransmitting apparatus 6 both The retransmission apparatus 6 is identical in that it includes the transmitting section 500 and the transmitting antenna section 600, but in addition to the configuration of the retransmission apparatus 1, the M modulation sections 721 are further added. It differs in the point which it has. Hereinafter, in FIG. 10, parts common to FIG. 1 will be assigned the same reference numerals as in FIG. 1 and detailed explanations thereof will be omitted.

[0067] The modulation section 721 has its own TS such as autonomous broadcasting, community broadcasting, commercials, and independent production.

When a signal is input (for example, MPEG (Moving Picture Experts Group)-TS), the OFDM modulation circuit 701 of the modulation unit 721 adds an error correction code to the input unique TS signal, and performs QPSK (Quadrature Phase Shift Keying) modulation, Carrier modulation is performed according to the rate and purpose such as 16 QAM (Quadrature Amplitude Modulation) modulation and 64 QAM modulation, and various interleaving processing is performed.

OFDM framing processing circuit 702 receives the signal modulated by OFDM modulation circuit 701 and adds a pilot carrier, AC (Auxiliary Channel) and TMCC in the same arrangement as the partial reception unit of terrestrial digital broadcasting. Perform OFDM framing processing.

[0069] The inverse Fourier transform circuit 703 inputs a signal that has been subjected to OFDM framing processing by the OFDM framing processing circuit 702, and inverse Fourier transforms carrier data of one symbol of the signal into a time domain signal. The GI addition circuit 704 receives the time domain signal that has been inverse Fourier transformed by the inverse Fourier transformation circuit 703, and performs addition of GI according to a preset GI ratio. The segment arrangement circuit 705 receives the signal to which GI is added by the GI addition circuit 704, and performs frequency conversion to a segment arranged when connecting to one equivalent baseband signal. The segment placement circuit 705 is functionally identical to the segment placement circuit 302.

Adder circuit 400 receives the equivalent baseband signal of the one-segment portion digitally processed by N-system digital processing unit 311, and the equivalent baseband signal of the unique TS signal modulated by M-system modulation unit 721. Signals are input, and these equivalent baseband signals are added and synthesized.

As described above, according to the terrestrial digital broadcast retransmitting apparatus 6 of the sixth embodiment, the sixth embodiment is the same as the sixth embodiment.

The same effect as in (1) can be obtained, and a TS signal independently generated separately from digital terrestrial television broadcasting can be added and transmitted together with digital terrestrial television broadcasting.

Example Ί Next, Example 7 will be described. This seventh embodiment uses the method of the second embodiment to connect the signals of the N partial receivers in N digital terrestrial digital broadcasting to be received and the M unique TS signals into one channel. Sending.

FIG. 11 is a block diagram showing a configuration (example 7) of the terrestrial digital broadcast re-transmission apparatus according to the embodiment of the present invention. The retransmission apparatus 7 includes a reception antenna unit 100, N tuner parts 200, N digital processing units 312, M modulation units 721, an adder circuit 400, a retransmission unit 500, and a transmission antenna unit 600. Configured Comparing the retransmission apparatus 2 of the second embodiment shown in FIG. 4 with the retransmission apparatus 7, the difference is that the retransmission apparatus 7 further includes a modulator 721 in addition to the configuration of the retransmission apparatus 2. Do. Further, comparing the retransmission device 6 of the sixth embodiment shown in FIG. 10 with the retransmission device 7, the retransmission device 7 is a digital processing unit having a configuration different from the digital processing unit 311 of the retransmission device 6. It differs in that it has 312.

The reception antenna unit 100, the tuner part 200, the digital processing unit 312, the adder circuit 400, the retransmission unit 500, and the transmission antenna unit 600 are the same as those of the retransmission apparatus 2 in the second embodiment. I omit explanation. In addition, since the modulator 721 is the same as that of the retransmission apparatus 6 in the sixth embodiment, the description will be omitted.

As described above, according to the terrestrial digital broadcast retransmitting apparatus 7 of the seventh embodiment, the same effect as that of the second embodiment can be obtained, and independently generated separately from the terrestrial digital television broadcasting. The added TS signal can be transmitted along with digital terrestrial television broadcasting.

Example 8

Next, an eighth embodiment will be described. In this eighth embodiment, using the method of the third embodiment, signals of N partial receivers in N digital terrestrial digital broadcasting to be received and M unique TS signals are connected in one channel. In particular, it transmits the signals of the partial reception unit of each channel and the symbol timing of the unique TS signal at the same time.

FIG. 12 is a block diagram showing a configuration (example 8) of the terrestrial digital broadcast re-transmission apparatus according to the embodiment of the present invention. The retransmission apparatus 8 includes N receiving antennas 100, N A tuner part 200, N digital processing units 313, M modulation units 723, a delay time adjustment circuit 307-8, an adder circuit 400, a retransmission unit 500, and a transmission antenna unit 600. The modulation unit 723 is configured by M systems, and since each system is configured by the same circuit, only one system will be described below. The modulation unit 723 is composed of an OFDM modulation circuit 701, an OFDM framing processing circuit 702, an inverse Fourier transform circuit 703, a GI addition circuit 704, a digital delay circuit 706, and a segment arrangement circuit 705. Comparing the retransmission apparatus 3 of the third embodiment shown in FIG. 6 with the retransmission apparatus 8, the reception antenna unit 100, the tuner part 200, the digital processing unit 313, the adder circuit 400, and the retransmission signal in both apparatuses are compared. The power retransmitting apparatus 8 which is the same in that it includes the section 500 and the transmitting antenna section 600 is that it includes M modulation sections 723 and the delay time adjustment circuit 307-3 of the retransmitting apparatus 3 The difference is that different delay time adjustment circuits 307-8 are provided. Hereinafter, in FIG. 12, parts common to FIG. 3 are assigned the same reference numerals as in FIG. 3, and detailed descriptions thereof will be omitted. Further, since the OFDM modulation circuit 701, the OFDM framing processing circuit 702 and the inverse Fourier transform circuit 703 of the modulation section 723 are the same as those of the modulation section 721 of the retransmission apparatus 6 shown in FIG. Is omitted.

GI addition circuit 704 of modulation section 723 receives the time domain signal that has been inverse Fourier transformed by inverse Fourier transformation circuit 703, and performs addition of GI according to a preset GI ratio. Also, the head position information of the symbol is output to the delay time adjustment circuit 307-8.

[0079] The delay time adjustment circuit 307-8 receives the head position information of the symbol from the symbol synchronization detection circuit 304 of each system of the digital processing unit 313-;!-N, and the modulation unit 723- of each system. The head position information of the symbols is input from the GI appending circuit 704 of ~ M, respectively, and the symbol head timings of equivalent baseband signals of the respective systems coincide with each other on the basis of the reception timing of any equivalent baseband signal. Calculate the delay time of each system.

Digital delay circuit 706 of each system in modulation section 723 receives the signal of the time domain to which GI is added by GI addition circuit 704, and inputs the delay time calculated by delay time adjustment circuit 307-8. , Delay by the delay time.

The segment placement circuit 705 receives the signal delayed by the digital delay circuit 706, and It performs frequency conversion to the segment placed when linking to one equivalent baseband signal.

Adder circuit 400 receives the equivalent baseband signal of the one-segment portion digitally processed by N series of digital processing unit 313, and the equivalent baseband of the unique TS signal modulated by M series of modulation unit 723. Signals are input, and these equivalent baseband signals are added and synthesized.

As described above, according to the terrestrial digital broadcast retransmitting apparatus 8 of the eighth embodiment, the same effect as that of the third embodiment can be obtained, and independently generated separately from the terrestrial digital television broadcasting. The added TS signal can be transmitted along with digital terrestrial television broadcasting.

In addition, it is possible to match the symbol timing of the signal of the one-segment portion of each channel and the unique TS signal S. Since this makes it possible to align the symbol head positions of the equivalent baseband signals, when combining as one equivalent baseband signal in the adder circuit 400, it is possible to align and transmit the symbol synchronization timing.

Example 9

Next, Example 9 will be described. This embodiment 9 uses the method of the embodiment 4 to connect signals of N partial receivers in M digital terrestrial broadcasting of N waves to be received and M unique TS signals into one channel. In particular, it transmits together the symbol timing and the SP pattern in the signal of the partial reception unit of each channel and the unique TS signal.

FIG. 13 is a block diagram showing a configuration (example 9) of a terrestrial digital broadcast re-transmission apparatus according to an embodiment of the present invention. This retransmission apparatus 9 includes a reception antenna unit 100, N tuner parts 200, N digital processing units 314, M modulation units 723, delay time adjustment circuit 307-9, adder circuit 400, retransmission unit And 500, and a transmitting antenna unit 600. The modulation unit 723 is configured by M systems, and since each system is configured by the same circuit, only one system will be described below. Comparing the retransmission apparatus 4 of the fourth embodiment shown in FIG. 5 with the retransmission apparatus 9, the reception antenna unit 100, the tuner unit 200, the digital processing unit 314, the adder circuit 400, and the retransmission unit 500 in both devices. And transmitting antenna unit 6 00, the same force S as in the point of having 00, the point that the retransmission device 9 has M modulation parts 723 and the delay time adjustment circuit 307-4 of the retransmission device 4 is different from the delay time adjustment circuit 307-4. The difference is that the time adjustment circuit 307-9 is provided. Further, when comparing the retransmission apparatus 8 of the eighth embodiment shown in FIG. 12 with the retransmission apparatus 9, the retransmission apparatus 9 corresponds to the digital processing unit 313 of the retransmission apparatus 8 and the delay time adjustment circuit 307-8. Are different in that they have digital processing units 314 and delay time adjustment circuits 307-9 of different configurations. Hereinafter, in FIG. 13, the same parts as in FIG. 7 will be assigned the same reference numerals as in FIG. 7, and detailed descriptions thereof will be omitted. Also, since the OFDM modulation circuit 701, the OFDM framing processing circuit 702 and the inverse Fourier transform circuit 703 of the modulation section 723 are the same as those of the modulation section 723 of the retransmission apparatus 8 shown in FIG. Is omitted.

The GI addition circuit 704 of the modulation unit 723 receives the time domain signal inverse-Fourier-transformed by the inverse Fourier transform circuit 703, and performs GI addition in accordance with a preset GI ratio. Also, the start position information of the symbol and the SP pattern information are output to the delay time adjustment circuit 307-9.

The delay time adjustment circuit 307-9 receives the head position information and the SP pattern information of the symbol from the digital processing unit 314 of each system, respectively, and receives the modulation pattern 723 of each system. The head position information and the SP pattern information of the symbol are input from the GI addition circuit 704 of M, respectively, and the symbol head timing of the equivalent baseband signal of each system based on the reception timing of one of the equivalent baseband signals. And the delay time of each system is calculated so that the SP pattern matches.

Digital delay circuit 706 of each system in modulation section 723 receives the signal of the time domain to which GI is added by GI addition circuit 704, and inputs the delay time calculated by delay time adjustment circuit 307-9. , Delay by the delay time.

The segment placement circuit 705 receives the signal delayed by the digital delay circuit 706, and

It performs frequency conversion to the segment placed when linking to one equivalent baseband signal.

[0091] Adder circuit 400 receives the equivalent baseband signal of the one-segment portion digitally processed by digital processing unit 314 of N channels, and is modulated by modulation unit 723 of M channels. The equivalent baseband signal of the original TS signal is input, and these equivalent baseband signals are added and synthesized.

As described above, according to the terrestrial digital broadcast re-transmission apparatus 9 of the ninth embodiment,

The same effect as in (4) can be obtained, and a TS signal independently generated separately from digital terrestrial television broadcasting can be added and transmitted together with digital terrestrial television broadcasting.

In addition, it is possible to match the symbol timing and the SP pattern of the signal of the one segment part of each channel and the unique TS signal. This makes it possible to align the symbol head position and the SP pattern of each equivalent baseband signal, and therefore, when concatenating as one equivalent baseband signal in the adder circuit 400, the symbol synchronization timing is aligned and the SP pattern is adjusted. It becomes possible to arrange and transmit.

Example 10

Next, Example 10 will be described. In this embodiment 10, using the method of the embodiment 5, signals of N partial receivers in received N digital terrestrial digital broadcasting and M unique TS signals are connected in one channel. The transmission is performed, in particular, by matching the start position of the frame in the signal of the partial reception unit of each channel and the unique TS signal.

FIG. 14 is a block diagram showing a configuration (example 10) of the terrestrial digital broadcast re-transmission apparatus according to the embodiment of the present invention. The retransmission apparatus 10 includes a reception antenna unit 100, N tuner parts 200, N digital processing units 315, M modulation units 723, delay time adjustment circuit 307-10, adder circuit 400, retransmission It comprises a section 500 and a transmitting antenna section 600. The modulation unit 723 is configured by M systems, and since each system is configured by the same circuit, only one system will be described below. Comparing the retransmission apparatus 5 of the fifth embodiment shown in FIG. 9 with this retransmission apparatus 10, the receiving antenna unit 100, the tuner part 200, the digital processing unit 315, the adder circuit 400, The force retransmitting apparatus 10 which is identical in that the transmitting section 500 and the transmitting antenna section 600 are provided includes M modulation sections 723 and a delay time adjusting circuit 307-5 of the retransmitting apparatus 5. And a delay time adjustment circuit 307-10 having a different configuration. Also, in the ninth embodiment shown in FIG. Comparing the retransmission device 9 with the retransmission device 10, the retransmission device 10 is different from the digital processing unit 314 of the retransmission device 9 and the digital processing unit 315 and the delay of the delay time adjustment circuit 307-9. The difference is that the time adjustment circuit 307-10 is provided. Hereinafter, in FIG. 14, the same parts as in FIG. 9 will be assigned the same reference numerals as in FIG. 9, and detailed descriptions thereof will be omitted. Also, since the OFDM modulation circuit 701, the OFDM framing processing circuit 702 and the inverse Fourier transform circuit 703 of the modulation section 723 are the same as those of the modulation section 723 of the retransmission apparatus 9 shown in FIG. I omit it.

The GI addition circuit 704 of the modulation unit 723 receives the time domain signal that has been inverse Fourier transformed by the inverse Fourier transformation circuit 703, and performs GI addition in accordance with a preset GI ratio. Also, the head position information of the frame is output to the delay time adjustment circuit 307-10.

[0097] The delay time adjustment circuit 307-10 receives the head position information of the frame from the digital processing units 315 to! N of each system, and adds GI of the modulation units 723 to! The delay time of each system is input so that the frame start timings of equivalent baseband signals of the respective systems coincide with each other by inputting the head position information of the frame from the circuit 704 and referring to the reception timing of any equivalent baseband signal. Calculate

Digital delay circuit 706 of each system in modulation section 723 receives the signal of the time domain to which GI is added by GI addition circuit 704, and inputs the delay time calculated by delay time adjustment circuit 307-10. And delay by the delay time.

[0100] Adder circuit 400 receives the equivalent baseband signal of the one-segment portion digitally processed by digital processing unit 315 of N channels, and the equivalent baseband of the unique TS signal modulated by modulation unit 723 of M channels. Signals are input, and these equivalent baseband signals are added and synthesized.

As described above, according to the terrestrial digital broadcast retransmitter 10 of the tenth embodiment, the same effect as that of the fifth embodiment can be obtained, and it is uniquely generated separately from the terrestrial digital television broadcast. Add TS signal and transmit along with digital terrestrial television broadcasting That power S.

In addition, it is possible to match the positions of the frame start positions of the signal of the one segment part of each system and the unique TS signal. This makes it possible to align the frame start positions of the equivalent baseband signals, and therefore, when concatenating as one equivalent baseband signal in the adder circuit 400, the timing of frame synchronization is aligned, and the timing of symbol synchronization and SP It will be possible to re-send the turns as well.

The present invention has been described above with reference to examples, but the present invention can be variously modified without departing from the technical concept of the present invention, which is not limited to the examples. For example, in the embodiment described above, the receiving antenna unit 100 is constituted by one antenna, but it may be constituted by a plurality of antennas which necessarily need to be one. In this case, each tuner part 200 inputs terrestrial digital broadcast received by any one of a plurality of antennas.

Further, in the above embodiment, the reception conversion circuit 201 of the tuner part 200 converts the input signal into an intermediate frequency and passes through the SAW filter as a reception method by an intermediate frequency, and then the frequency is changed to a low frequency again. Force to convert is not limited to this. For example, Low IF (Low Intermediate Frequency) method, which directly converts an input signal to a low intermediate frequency signal of 0.5 to 0.5 MHz; converts the input signal to a high frequency (for example, 2 GHz), and converts the SAW filter into one. After passing, it uses a double 'conversion (double conversion) method to convert to a low frequency (for example 1 MHz) and a direct conversion method to convert the input signal directly to an equivalent baseband signal. It is also good. For details on the reception method using the intermediate frequency, see “Study of Hatori Mitsutoshi,“ 1Seg Broadcast Textbook ”, Press R & D, Inc. issued!”.

Further, in the above embodiment, although terrestrial digital broadcasting is targeted, it is also possible to apply S / S to terrestrial digital audio broadcasting.

Claims

The scope of the claims

Terrestrial digital broadcasting that receives a plurality of terrestrial digital broadcasts composed of a plurality of segments, extracts one segment from each of these terrestrial digital broadcast waves, connects the extracted segments, and retransmits them as a terrestrial digital broadcast wave. In the retransmitter,

A plurality of tuners, a plurality of digital processing units respectively corresponding to the tuners, an adder, and a retransmission unit;

The tuner part is

Reception conversion means for selecting one of the plurality of received terrestrial digital broadcast waves and converting the RF band signal of this broadcast wave into an IF band signal;

AD conversion means for converting the IF signal converted by the reception conversion means into a digital IF signal;

Quadrature demodulation means for performing quadrature demodulation on the digital IF signal converted by the AD conversion means, and outputting an equivalent baseband signal;

The digital processing unit

Filter means for extracting one segment from the equivalent baseband signal output by the quadrature demodulation means of the tuner part;

And segment arranging means for frequency converting the equivalent baseband signal of one segment extracted by the filter means to a position for connecting a plurality of segments,

The adding unit is

And a unit for adding and combining the equivalent baseband signals of each one of the segments frequency-converted by the segment arrangement unit of the plurality of digital processing units,

The retransmission unit is

Quadrature modulation means for performing quadrature modulation on the equivalent baseband signal added and synthesized by the addition section and outputting a digital IF signal;

DA conversion means for converting the digital IF signal output by the quadrature modulation means into an analog IF signal; And transmitting and converting means for converting the analog IF signal converted by the D / A converting means into an RF band signal for retransmitting as a terrestrial digital broadcast wave, and amplifying the converted signal. Transmitter.

[2] In the terrestrial digital broadcast retransmitting apparatus according to claim 1,!

The digital processing unit

Symbol synchronization detection means for detecting a symbol timing for symbol synchronization and a frequency error amount for the equivalent baseband signal of one segment extracted by the filter means;

Frequency error correction means for correcting a frequency error using the equivalent baseband signal of one segment extracted by the filter means and the frequency error amount detected by the symbol synchronization detection means;

One symbol length is extracted from the equivalent baseband signal using the equivalent baseband signal of one segment corrected by the frequency error correction means and the symbol timing detected by the symbol synchronization detection means 1 From the both ends of the symbol length When the positions of half of the guard interval length are the first and second positions and the positions of the both ends force and the guard interval length are the third and fourth positions, Guard interval changing means for changing a signal between the first position and the third position and a signal between the second position and the fourth position as a new guard interval;

And segment arranging means for frequency converting the equivalent baseband signal of one segment whose guard interval has been changed by the guard interval changing means to a position for connecting a plurality of segments. apparatus.

[3] In the terrestrial digital broadcast retransmitting apparatus according to claim 1,!

The digital signal processing apparatus further includes a delay time adjustment unit that adjusts a delay time for adjusting the timing of the equivalent baseband signals in the plurality of digital processing units.

The digital processing unit Filter means for extracting one segment from the equivalent baseband signal output by the quadrature demodulation means of the tuner part;

A delay for delaying the equivalent baseband signal of one segment by the delay time using the equivalent baseband signal of one segment corrected by the frequency error correction means and the delay time adjusted by the delay time adjustment unit. Department,

Segment arranging means for frequency-converting the equivalent baseband signal of one segment delayed by the delay unit to a position for connecting a plurality of segments;

The delay time adjustment unit

Means for calculating each delay time to match the timing of each equivalent baseband signal in the digital processing unit using the symbol timing detected by the symbol synchronization detection means of the plurality of digital processing units. Retransmission apparatus characterized by having.

In the terrestrial digital broadcast retransmitting apparatus according to claim 1,!

The digital processing unit further includes a delay time adjustment unit that adjusts a delay time for adjusting timing with respect to each equivalent baseband signal in each of the plurality of digital processing units.

An equivalent baseband signal of one segment extracted by the filter means; Frequency error correction means for correcting a frequency error using the frequency error amount detected by the symbol synchronization detection means;

The equivalent baseband signal of one segment corrected by the frequency error correction means! /, FFT means for converting the time domain signal to the frequency domain signal, and the frequency domain converted by the FFT means SP pattern detection means for detecting an SP pattern for

The delay time adjustment unit

The digital processing unit using symbol timing detected by the symbol synchronization detection unit of the plurality of digital processing units and an SP pattern detected by SP pattern detection units of the plurality of digital processing units. A retransmission apparatus characterized by comprising means for calculating respective delay times so as to match symbol timings and SP patterns of respective equivalent baseband signals.

[5] In the terrestrial digital broadcast re-transmission device according to claim 1,!

The frequency error is calculated using the equivalent baseband signal of one segment extracted by the filter means and the frequency error amount detected by the symbol synchronization detection means. Frequency error correction means for correcting;

The equivalent baseband signal of one segment corrected by the frequency error correction means! /, FFT means for converting the time domain signal to the frequency domain signal, and the frequency converted by the FFT means Frame synchronization detection means for detecting frame timing for frame synchronization using a TMCC signal for an area signal, an equivalent baseband signal of one segment corrected by the frequency error correction means, and the delay time adjustment unit A delay unit for delaying the equivalent baseband signal of the one segment by the delay time using the delay time adjusted by

The delay time adjustment unit

The digital processing unit using symbol timings detected by the symbol synchronization detection unit of the plurality of digital processing units and frame timings detected by the frame synchronization detection unit of the plurality of digital processing units. A re-transmission apparatus characterized by comprising means for calculating respective delay times so as to match frame timings of respective equivalent baseband signals.

The re-transmission device according to any one of claims 1 to 5!

Furthermore, a plurality of modulation units are provided,

The modulation unit is

OFDM modulation means that inputs original TS signal and performs OFDM modulation,

OFDM framing means for applying OFDM framing to the signal OFDM-modulated by the OFDM modulation means;

Inverse Fourier transform means for converting a signal in the frequency domain into a signal in the time domain for the OFDM framed signal by the OFDM framing means;

Guard interval adding means for adding a guard interval to the time domain signal transformed by the inverse Fourier transform means;

The signal to which the guard interval is added by the guard interval adding means (equivalent baseband signal of a unique TS signal) is placed at a position for connecting a plurality of segments. Segment arrangement means for frequency conversion;

The adding unit is

Equivalent baseband signal of one segment of each of the frequency converted by the segment arrangement unit of the plurality of digital processing units, and equivalent of each unique TS signal of which frequency conversion is performed by the segment arrangement unit of the plurality of modulation units A retransmission apparatus characterized by comprising means for adding and synthesizing a baseband signal.

The retransmission device according to any one of claims 1 to 6 /!

A retransmission apparatus characterized in that one segment extracted by the filter means of the digital processing unit is a segment of a partial reception unit of a mobile broadcast for a mobile unit or a segment of terrestrial digital audio broadcasting.