JP2012129604A - Receiving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a receiving device in which received signals transmitted from a plurality of antennas are not degraded by disturbing signals and capable of shortening the total cable length.SOLUTION: In a plurality of antenna blocks 110a and 110b, each of selection units 102a and 102b convert the common selection-channel signal into intermediate frequency bands IFa and IFb that are different from each other. A mixer 111b mixes each selection-channel signal. The mixed selection-channel signal is transmitted to a demodulation and reproduction unit 109 via a single cable 103. In the demodulation and reproduction unit 109, a splitter 112 splits the transmitted selection-channel signal, a plurality of demodulation units 104a and 104b demodulate the selection-channel signals converted into each intermediate frequency band. A combining unit 105 combines each demodulated signal.

Description

  The present invention relates to a receiving apparatus that receives a broadcast / communication signal by an antenna and demodulates and reproduces the signal. In particular, the present invention relates to a receiving apparatus having a configuration in which the antenna and the demodulating / reproducing unit are installed differently and are connected by a cable.

  Since Japanese digital terrestrial television broadcasting (ISDB-T broadcasting) uses OFDM (Orthogonal frequency division multiplexing) as a modulation method, it is resistant to multipath and can be subjected to time interleaving. It has the feature of being strong against mobile reception. Furthermore, by using a mobile layer or a mobile layer, it is possible to select parameters that are strong against transmission distortion for the modulation scheme and error correction coding rate. For this reason, the mobile body reception of ISDB-T broadcasting is anticipated, and the application to the vehicle-mounted mobile body receiver is advanced.

  Conventionally, when an antenna block is attached to a vehicle apart from a channel selection unit, various interference signals generated from the vehicle are mixed from cables in the middle of the received signal portion transmitted in the frequency band of the interference signal. There was a problem of degrading performance. In order to solve this problem, for example, in Patent Document 1, a channel selection unit is provided on the antenna side, and the received broadcast / communication signal is converted into an intermediate frequency band different from the frequency band of the interference signal and transmitted. As a result, the influence on the received signal due to the interference signal mixed from the cable in the middle between the antenna and the demodulating / reproducing unit is eliminated, and the performance deterioration of the received signal is prevented.

JP 2008-160544 A

  However, in the above-described prior art, the length of the cable connecting the antenna and the demodulating / reproducing unit (hereinafter also simply referred to as a demodulating unit) increases in proportion to the number of antennas. In a receiver that performs mobile reception, a diversity reception system including a plurality of antennas is used to improve reception performance. In the case of an in-vehicle receiver that is a typical mobile receiver, the cable connecting the antenna and the demodulator has a length of several meters. As the number of antennas increases, the total cable length becomes longer, which increases the cable cost and has a problem that many cables must be mounted in a limited space of the vehicle.

  In view of the above-described problems, the present invention has an object to provide a receiving apparatus in which reception signals transmitted from a plurality of antennas are not deteriorated in performance by interference signals and the total cable length can be shortened. To do.

  The present invention is a receiving apparatus that transmits a signal received by N (N is a plurality) antenna blocks through a cable and reproduces the signal by a demodulation and reproduction unit, and each antenna block includes an antenna that receives a plurality of channel signals, Each channel selection unit selects a common channel signal from a plurality of channel signals and converts the channel signal into different intermediate frequency bands, and at least one of the antenna blocks includes N selection channels output from each channel selection unit. The mixer has a mixer for mixing the station channel signals, and the cable transmits the channel selection channel signal mixed by the mixer to the demodulation and reproduction unit. The demodulation and reproduction unit divides the mixed channel selection channel signal into N pieces. A demultiplexer for wave generation, N demodulating units for demodulating the channel selection channel signals converted from the demultiplexed channel selection channel signals into respective intermediate frequency bands, and N demodulation units And a synthesizing unit for synthesizing the demodulated signals.

  According to the present invention, signals from a plurality of antennas are converted to different intermediate frequency bands and transmitted through a single cable, thereby eliminating the influence of interfering signals mixed from the cable and reducing the total cable length. . Therefore, the cost required for the cable can be reduced, and the cable can be easily mounted in a vehicle or the like.

It is a block diagram which shows the structure of the receiver which becomes the 1st Example of this invention. It is a block diagram which shows the internal structure of each channel selection part 102a, 102b of FIG. It is a block diagram which shows the internal structure of each demodulation part 104a, 104b of FIG. It is a figure which shows an example of a structure of the mixer 111b and the splitter 112 of FIG. It is a figure which shows the frequency spectrum of the signal handled with the receiver of FIG. It is a block diagram which shows the structure of the receiver which becomes a 2nd Example of this invention. It is a figure which shows the frequency spectrum of the signal handled with the receiver of FIG.

  Hereinafter, embodiments of the present invention will be described by taking an in-vehicle receiver that performs mobile reception as an example.

  FIG. 1 is a block diagram showing a configuration of a receiving apparatus according to a first embodiment of the present invention, and particularly shows a case of a diversity receiving apparatus that receives and moves ISDB-T broadcasts using two antennas.

  The receiving apparatus includes two antenna blocks 110 a and 110 b and a demodulation / playback unit 109. The antenna block 110a includes an antenna 101a and a channel selection unit 102a, and is connected to the antenna block 110b via a cable 103a. The antenna block 110b includes an antenna 101b, a channel selection unit 102b, and a mixer 111b, and is connected to the demodulation / reproduction unit 109 via the cable 103.

  In the antenna block 110a, the channel selection unit 102a extracts a necessary channel selection band from the received signal received by the antenna 101a and converts it to the intermediate frequency band IFa. The channel selection channel signal converted to the intermediate frequency band IFa is input to the mixer 111b of the antenna block 110b via the cable 103a. On the other hand, in the antenna block 110b, the channel selection unit 102b extracts a channel selection channel band that is common to the channel selection channel extracted by the channel selection unit 102a from the received signal received by the antenna 101b, and converts it to the intermediate frequency band IFb. Here, the intermediate frequency band IFb is a frequency band different from the intermediate frequency band IFa. The channel selection channel signal converted to the intermediate frequency band IFb is input to the mixer 111b via the wiring 130b. The mixer 111b mixes the channel selection channel signal from the channel selection unit 102a input via the cable 103a and the channel selection channel signal from the channel selection unit 102b input via the wiring 130b. The mixed channel selection channel signal is transmitted to the demodulation / playback unit 109 via a single cable 103.

  The demodulation / playback unit 109 includes a duplexer 112, demodulation units 104 a and 104 b, a synthesis unit 105, and a decoding unit 106. The mixed channel selection signal transmitted to the demodulation and reproduction unit 109 via the cable 103 is demultiplexed into two channel selection channel signals by the demultiplexer 112. The demultiplexed channel selection channel signals are input to the demodulation units 104a and 104b via the wirings 140a and 140b and demodulated, respectively. The combining unit 105 performs diversity combining processing from the two output signals from the demodulation units 104a and 104b, and outputs a signal with improved C / N. In the diversity combining process, a signal having a good C / N is selected, a maximum ratio combining of two output signals is performed, and the like. The synthesized signal is decoded by the decoding unit 106 and output from the terminal 107 as a reproduction signal.

  On the other hand, a channel selection signal for selecting a channel selection channel band is input to the terminal 108 of the demodulation / playback unit 109. The demodulation units 104 a and 104 b (or either one) generate a tuning control signal and transmit it to the antenna blocks 110 a and 110 b via the cable 103. The channel selection units 102a and 102b in the antenna block receive the control signal, extract the channel selection channel band from the received signal, and perform conversion processing to the intermediate frequency bands IFa and IFb. The demodulation units 104a and 104b (or either one) supply DC power to the antenna blocks 110a and 110b.

  As described above, the receiving apparatus according to the present embodiment converts the channel selection channel signal common to the two antenna blocks 110a and 110b into different intermediate frequency bands IFa and IFb, and the antenna block 110a, The data is transmitted to the demodulation / playback unit 109 installed at a location distant from 110b, and the demodulation / playback unit 109 obtains a playback signal. When such a receiving apparatus is mounted on a vehicle, for example, two antenna blocks 110a and 110b are installed at the left and right positions on the rear (rear) glass surface of the vehicle, and the demodulating / reproducing unit 109 is installed in the car stereo near the driver's seat. It is common to install in a part. The demodulating / reproducing unit 109 and the antenna block 110b are connected by the cable 103, and the antenna blocks 110b and 110a are connected by the cable 103a. In the case of such a connection form, the distance between the demodulating / reproducing unit 109 (near the driver's seat) and the antenna blocks 110a and 110b (rear of the vehicle) is the distance between the two antenna blocks 110a and 110b (the left and right width of the rear part). Therefore, the length of the cable 103 is longer than that of the cable 103a. Therefore, the configuration of the present embodiment in which the antenna blocks 110a and 110b to the demodulation / reproduction unit 109 are connected by one cable 103 is connected to the antenna blocks 110a and 110b and the demodulation / reproduction unit 109 by two different cables. Compared with the structure to perform, the total cable length which match | combined the cables 103a and 130 can be shortened. Specifically, the total cable length can be shortened by the difference between the cables 103 and 103a. By reducing the total cable length in this way, it is possible to reduce the cost of the cable and to obtain an effect that the cable can be easily mounted (routed) in the vehicle.

Next, the configuration and operation of each unit of the receiving apparatus illustrated in FIG. 1 will be described in detail.
FIG. 2 is a block diagram illustrating an internal configuration of each of the channel selection units 102a and 102b in FIG. The configuration of each of the channel selection units 102a and 102b is common, and will be indicated as the channel selection unit 102 below. The channel selection unit 102 includes a frequency conversion unit 203, a band pass filter (BPF) 204, a local oscillation unit 205, a reference signal generation unit 206, a control signal extraction unit 207, a control signal demodulation unit 208, and a DC power supply extraction unit (DC extraction unit). 209. A terminal 201 is connected to the antennas 101a and 101b to receive a received signal, and a terminal 202 is connected to the cable 103a or the wiring 130b.

  First, the operation of the tuning unit 102a will be described. A cable 103a is connected to the terminal 202 of the channel selection unit 102a, and a DC component is extracted from a signal on the cable 103a by a DC extraction unit 209 and used for power supply to the antenna block 110a. The control signal extraction unit 207 extracts a modulation control signal from the signal on the cable 103 a, demodulates the control signal demodulation unit 208, and outputs the demodulation control signal to the local oscillation unit 205. The local oscillation unit 205 receives the demodulation control signal, and outputs a local oscillation signal having a frequency Loa for selecting a desired channel selection channel signal to the frequency conversion unit 203. The frequency conversion unit 203 obtains a desired channel selection channel signal using the local oscillation signal Loa, limits the band to the intermediate frequency band IFa by the BPF 204, and transmits the channel selection channel signal converted to the intermediate frequency band IFa to the cable. To 103a.

  On the other hand, the channel selection unit 102b performs the same operation. A wiring 130b is connected to the terminal 202 of the channel selection unit 102b, and a DC component is extracted by the DC extraction unit 209 and used to supply power to the antenna block 110b. The control signal extraction unit 207 extracts the modulation control signal, demodulates it by the control signal demodulation unit 208, and outputs the demodulation control signal to the local oscillation unit 205. The local oscillation unit 205 receives this demodulation control signal and outputs a local oscillation signal Lob of frequency Lob for selecting a desired channel selection channel signal to the frequency conversion unit 203. The frequency conversion unit 203 obtains a desired channel selection channel signal using the local oscillation signal Lob, performs band limitation to the intermediate frequency band IFb by the BPF 204, and routes the channel selection channel signal converted to the intermediate frequency band IFb. To 130b.

  As described above, the two channel selection units 102a and 102b perform channel selection operation according to the common control signal sent from the demodulation unit 104a (or 104b). The two channel selection units 102a and 102b are connected to this control signal. An address code for identification is given. As a result, the channel selection units 102a and 102b can use different local oscillation signals Loa and Lob to convert to channel selection channel signals of different intermediate frequency bands IFa and IFb.

  The channel selection channel signal from the channel selection unit 102 a and the channel selection channel signal from the channel selection unit 102 b are mixed by the mixer 111 b and transmitted to the demodulation and reproduction unit 109 via the cable 103. In the demodulating / reproducing unit 109, the demultiplexer 112 demultiplexes the mixed channel selection channel signal and supplies the demultiplexed channel signal to the demodulating units 104a and 104b via the wirings 140a and 140b, respectively.

  FIG. 3 is a block diagram showing an internal configuration of each demodulator 104a, 104b in FIG. The configurations of the demodulating units 104a and 104b are common, and are shown as the demodulating unit 104 below. The demodulation unit 104 includes a band pass filter (BPF) 304, a demodulator 305, a DC power supply unit (DC supply unit) 306, and a control signal modulation unit 307. The terminal 301 is connected to the duplexer 112, and the terminal 302 is connected to the synthesis unit 105. A terminal 303 is connected to the terminal 108 and receives a channel selection control signal. Note that the DC supply unit 306 and the control signal modulation unit 307 are not necessarily provided in both of the demodulation units 104a and 104b, and may be configured in either one.

  The operation of the demodulation unit 104 will be described. One of the channel selection channel signals demultiplexed by the demultiplexer 112 is input to the terminal 301. The BPF 304 limits the channel selection channel signal to the intermediate frequency band. At this time, the pass band characteristics of the BPF 304 are made different between the demodulation units 104a and 104b, and channel selection channel signals of different intermediate frequency bands IFa and IFb are output. The demodulator 305 demodulates the channel selection channel signal and outputs it from the terminal 302 to the combining unit 105.

  On the other hand, the DC voltage from the DC supply unit 306 is superimposed on the wiring 140 a or 140 b through the terminal 301. When a channel selection signal for selecting a desired channel is input to the terminal 108, a control signal corresponding to the channel selection signal is input to the control signal modulation unit 307 via the terminal 303. The control signal modulation unit 307 modulates the control signal and generates a modulation control signal in a band different from DC and the intermediate frequency band. In other words, the modulation control signal is band-limited so as not to affect the DC and intermediate frequency. The modulation control signal is transmitted to the channel selection unit 102b via the duplexer 112, the cable 103, the mixer 111b, and the wiring 130b, and to the channel selection unit 102a via the cable 103a. When the control signal modulation unit 307 is provided in both the demodulation units 104a and 104b, the control signal uses the same frequency band. In that case, each demodulator 104a, 104b checks the signal state of the band of the modulation control signal and determines whether or not it can output the control signal itself, so that the mutual control signals interfere with each other. Absent.

  FIG. 4 is a diagram illustrating an example of the configuration of the mixer 111b and the duplexer 112 in FIG. The mixer 111b and the duplexer 112 can be realized with the same configuration, and include a resistance element 411 and high-frequency lines 412 and 413 therein.

  In the case of the mixer 111 b, the terminal 401 is connected to the cable 103 a (channel selection unit 102 a side), the terminal 402 is connected to the wiring 130 b (channel selection unit 102 b side), and the terminal 403 is connected to the cable 103. When the impedance of the input / output terminal of the mixer is, for example, 50Ω, the resistance element 411 is set to 100Ω, which is twice the input / output impedance, and the characteristic impedance of the high-frequency lines 412 and 413 is ¼ of about 70.7Ω, which is √2. If it is a wavelength transmission line, it operates as a Wilkinson type mixer (or duplexer). Thus, the signals input from the terminals 401 and 402 are mixed and output from the terminal 403. That is, the channel selection channel signal from the channel selection unit 102 a and the channel selection channel signal from the channel selection unit 102 b can be mixed and output to the cable 103.

  On the other hand, in the case of the duplexer 112, the input / output configuration is reversed. That is, the terminal 403 is connected to the cable 103, the terminal 401 is connected to the wiring 140a (the demodulation unit 104a side), and the terminal 402 is connected to the wiring 140b (the demodulation unit 104b side). Thus, the signal input from the terminal 403 is divided into two powers and output from the terminals 401 and 402. That is, the signal input from the cable 130 can be distributed and output to the demodulation unit 104a and the demodulation unit 104b.

  The duplexer described above distributes an input signal to a plurality of identical signals, but a duplexer that divides the signals into different bands at a plurality of terminals may be used. In this case, 412 is a band-pass filter whose intermediate frequency band IFa is a pass band, and 413 is a band-pass filter whose intermediate frequency band IFb is a pass band. The signal is output to the terminal 402 and the channel selection channel signal of the intermediate frequency band IFb is output.

  FIG. 5 is a diagram illustrating a frequency spectrum of a signal handled by the receiving apparatus according to the present embodiment. Reference numeral 501 indicates a DC power source from the DC supply unit 306, reference numeral 502 indicates a modulation control signal output from the control signal modulation unit 307, reference numerals 503a and 503b indicate that the channel selection units 102a and 102b convert the intermediate frequency bands IFa and IFb, respectively. The selected channel signal, and reference numerals 504a, 504b, and 504c indicate a plurality of channel signals that can be received by the antenna. Here, the DC 501, the modulation control signal 502, the channel selection channel signals (intermediate frequency bands) 503a and 503b, and the plurality of channel signals 504a, 504b, and 504c are set to different frequency bands so as not to overlap each other.

  In the example of FIG. 5, the number of receivable channel signals is 504a, 504b, and 504c for simplicity, but generally several tens of channel signals can be received. In particular, in the case of ISDB-T broadcasting, from UHF13CH Up to UHF62CH, it covers a wide band from 470 MHz to 770 MHz. In the in-vehicle receiving apparatus, there are many sources of radio waves in the vehicle, and there is a high possibility that the radio signal is a jamming radio wave particularly for a received signal in a wide band called UHF. That is, when the cables 103a and 103 are transmitted in the UHF band, the quality of the channel signal in which the frequency of the disturbing radio wave overlaps with the cables 103 and 103 is affected by the mixing of the interfering radio wave into the cables 103 and 103. There is a risk that the quality of the reproduction signal output from the camera will deteriorate.

  Therefore, in this embodiment, as shown in FIG. 1, the channel selection unit 102 is arranged not in the demodulation / reproduction unit 109 but in the antenna block 110, and one channel signal is selected from a plurality of received channel signals to obtain an intermediate frequency band. Convert. For example, when the desired channel selection channel signal is 504b among the channel signals 504a, 504b, and 504c, the channel selection unit 102a converts the frequency of the channel signal 504b and selects the channel selection channel signal 503a in the intermediate frequency band IFa. And The channel selection unit 102b converts the frequency of the channel signal 504b into a channel selection channel signal 503b in the intermediate frequency band IFb. The channel selection channel signal 503 a and the channel selection channel signal 503 b are mixed and transmitted to the demodulation and reproduction unit 109 via the cable 103. At this time, the channel selection channel signals 503a and 503b are converted into intermediate frequency bands IFa and IFb, which are frequency bands that are difficult to receive jamming radio waves. Quality deterioration can be prevented.

  The intermediate frequency bands IFa and IFb to be converted into the channel selection channel signals 503a and 503b preferably have a lower frequency (for example, 40 to 60 MHz) than the received channel signals 504a, 504b and 504c, but are not limited thereto. If the frequency band is difficult to receive radio waves, it may be converted to a frequency higher than that of the channel signals 504a, 504b, and 504c. The modulation control signal 502 is also less susceptible to jamming and has a lower frequency than the intermediate frequency bands IFa and IFb, but conversely may have a higher frequency than the intermediate frequency bands IFa and IFb.

In the first embodiment, the case of a diversity receiving apparatus including two antennas has been described. However, the present invention is not limited to this, and can be applied to a configuration including three or more antennas.
FIG. 6 is a block diagram showing a configuration of a receiving apparatus according to the second embodiment of the present invention, and particularly shows a case of a diversity receiving apparatus that receives and moves ISDB-T broadcasts by three antennas.

  In the receiving apparatus of the present embodiment, a third antenna block 110c is newly added to the configuration of the first embodiment (FIG. 1). Elements having the same functions as those in FIG. The antenna block 110c to be added includes an antenna 101c, a channel selection unit 102c, and a mixer 111c, and is inserted between the antenna block 110b and the cable 103. The antenna block 110c and the antenna block 110b are connected by a cable 103b. In addition, the demodulation / reproduction unit 109 newly adds a third-system demodulation unit 104c to the configuration of the first embodiment (FIG. 1). The demodulator 104c to be added is connected between the duplexer 112 and the synthesizer 105 by a wiring 140c.

  The operation of the receiving apparatus of this embodiment will be described. In the antenna block 110a, the channel selection unit 102a extracts a necessary channel selection band from the received signal received by the antenna 101a, and converts it into the intermediate frequency band IFa as a channel selection channel signal via the cable 103a. Output to. Similarly, in the antenna block 110b, a tuning channel band that is common to the tuning channel band extracted by the tuning unit 102a is extracted by the tuning unit 102b, and converted into a different intermediate frequency band IFb as a tuning channel signal. The data is output to the mixer 111b through the wiring 130b. The mixer 111b mixes two channel selection channel signals having different frequencies from the two channel selection units 102a and 102b, and outputs the mixed channel selection channel signal to the mixer 111c in the antenna block 110c via the cable 103b. . In the antenna block 110c, the channel selection unit 102c extracts a channel selection channel band that is the same as the channel selection channel band extracted by the channel selection units 102a and 102b, and this is extracted as an intermediate frequency band different from the intermediate frequency bands IFa and IFb. The channel selection channel signal converted into IFc is output to the mixer 111c via the wiring 130c. The mixer 111c mixes the channel selection channel signal from the channel selection units 102a and 102b input via the cable 103b and the channel selection channel signal input from the channel selection unit 102c input via the wiring 130c, thereby mixing the three waves. A channel signal is transmitted to the demodulation / playback unit 109 via the cable 103.

  In the demodulating / reproducing unit 109, the three-wave mixed channel selection channel signal transmitted via the cable 103 is demultiplexed into three mixed channel selection channel signals by the demultiplexer 112, and respectively via the wirings 140 a, 140 b and 140 c. Are sent to the demodulation sections 104a, 104b, and 104c. In each of the demodulation units 104a, 104b, and 104c, channel selection channel signals of different intermediate frequency bands IFa, IFb, and IFc are extracted by the BPF 304 included therein, and these channel selection channel signals are demodulated by the demodulator 305. The combining unit 105 performs diversity combining processing from the three output signals from the demodulating units 104a, 104b, and 104c, and outputs a C / N improved signal. The synthesized signal is decoded by the decoding unit 106 and output from the terminal 107 as a reproduction signal.

  FIG. 7 is a diagram illustrating a frequency spectrum of a signal handled by the receiving apparatus according to the present embodiment. The same reference numerals are assigned to the same signals as those in the first embodiment (FIG. 5). Reference numeral 503c is a channel selection channel signal converted by the channel selection unit 102c into the intermediate frequency band IFc. The channel selection channel signal 503c is set to a frequency band IFc different from the intermediate frequency bands IFa and IFb of the channel selection channel signals 503a and 503b converted by the channel selection units 102a and 102b.

  Also in this embodiment, the channel selection channel signal is converted into the intermediate frequency bands IFa, IFb, and IFc that are difficult to receive jamming radio waves. Quality deterioration can be prevented.

  Furthermore, in this embodiment, the three channel selection channel signals 503 a, 503 b, and 503 c are transmitted to the demodulation / reproduction unit 109 through one cable 103. Since the length of the cable 103 is longer than the length of the cables 103a and 103b connecting the antenna blocks 110a, 110b, and 110c, the antenna blocks 110a, 110b, and 110c to the demodulating / reproducing unit 109 are separated from each other by three. The total cable length can be shortened as compared with a configuration in which the cables are connected. As a result, the required cable length can be greatly shortened to reduce the cost, and the cable in the vehicle can be easily routed.

  Although the case where three antennas are provided has been described in the above example, the present invention can be similarly extended to a case where three or more antennas are provided. The diversity reception effect can be improved by increasing the number of antennas, and the increase in the total cable length can be minimized by applying the configuration of the present embodiment.

101a, 101b, 101c ... antenna,
102a, 102b, 102c, 102 ... tuning section,
103a, 103b, 103 ... cable,
104a, 104b, 104c, 104 ... demodulator,
105. Synthesis unit,
106: Decoding unit,
107... Reproduction signal output terminal,
108 ... Channel selection signal input terminal,
109 ... Demodulation reproduction part,
110a, 110b, 110c ... antenna block,
111b, 111c ... mixer,
112: duplexer,
203 ... frequency conversion unit,
205 ... Local oscillator,
207 ... control signal extraction unit,
208 ... control signal demodulator,
305 ... demodulator,
307: Control signal modulator.

Claims (4)

In a receiving apparatus for transmitting a signal received by N (N is a plurality) antenna blocks via a cable and reproducing the signal by a demodulation / reproducing unit,
Each of the antenna blocks includes an antenna that receives a plurality of channel signals, and a tuning unit that tunes a common channel signal from the plurality of channel signals and converts the channel signals to different intermediate frequency bands. At least one of the blocks includes a mixer that mixes N channel selection channel signals output from the channel selection units,
The cable transmits the channel selection channel signal mixed by the mixer to the demodulation and reproduction unit,
The demodulating / reproducing unit demultiplexes the mixed channel selection channel signal into N and a channel selection channel signal converted from the demultiplexed channel selection signal into each of the intermediate frequency bands. A receiving apparatus comprising: N demodulating sections for demodulating; and a combining section for combining demodulated signals from the N demodulating sections. The receiving device according to claim 1,
At least one of the demodulation units in the demodulation and reproduction unit includes a control signal modulation unit that modulates a control signal indicating a channel to be selected and transmits the modulation signal to the cable as a modulation control signal,
Each channel selection unit in each antenna block uses a control signal demodulation unit that demodulates the modulation control signal transmitted from the control signal modulation unit via the cable, and uses different local oscillation signals according to the control signal. And a frequency converter that converts a common channel signal from a plurality of channel signals received by the antenna into different intermediate frequency bands. The receiving apparatus according to claim 1 or 2,
The receiving apparatus, wherein a frequency band of the modulation control signal transmitted from the control signal modulating unit is different from the intermediate frequency band in which the channel selection channel signal is converted by each channel selection unit. The receiving apparatus according to claim 1 or 2,
Of the cables, the length of a cable connecting the antenna block and the demodulation / reproducing unit is longer than the length of each cable connecting the antenna blocks.

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