JP4719229B2 - Diversity reception system - Google Patents

Description

  The present invention relates to a diversity reception system, and more particularly to a diversity reception system that receives a broadcast signal.

  For example, there is a diversity reception technique as a technique for improving reception characteristics of digital signals such as terrestrial digital broadcasting. This is a technique for selecting or combining digital terrestrial broadcast signals received by a plurality of receiving antennas.

  Even in areas where digital terrestrial broadcasting can be received, there are areas where stable reception is difficult due to temporal fluctuations such as seasonal fluctuations. For such areas, diversity reception using a plurality of antennas is effective.

As a method of synthesizing terrestrial digital broadcast signals received by a plurality of antennas, there is a method of simply synthesizing after adjusting the phase of each of the high-frequency signals received by the plurality of antennas. In addition, as a method having a higher improvement effect, there is a method of adaptively selecting or combining a plurality of received signals according to the reception state of each antenna (see, for example, Patent Document 1).
Japanese Patent No. 3377361

  In the method of simple synthesis after phase adjustment with high-frequency signals, if multiple channels included in each received signal are synthesized at the same time, the phase shifts depending on the number of channels, and the reception characteristics are improved. There was a problem that became low.

  In addition, the method of adaptively selecting or combining a plurality of received signals according to the reception state requires a cable laying for each antenna from each receiving antenna to the terrestrial digital broadcast receiver, which increases the cost. It was.

  The present invention has been made in view of the above points, and provides a diversity reception system that can connect a plurality of reception antennas to a receiver with a single cable and can obtain an improvement effect of high reception characteristics. Objective.

In one embodiment of the invention, a plurality of antennas for receiving broadcast signals;
Multiplexing means for frequency-multiplexing the received signal of each antenna and sending it to the transmission line;
Receiving means for receiving a multiplex signal transmitted through the transmission line in tune with an arbitrary channel;
Demodulation means for demodulating the signal of the channel received by the receiving means;
Channel scanning means for causing the receiving means to scan a plurality of physical channels included in the multiplexed signal;
Based on the reception state obtained by the reception unit or the demodulation unit during scanning by the channel scanning unit, the reception signal having the best reception state among the reception signals of the same broadcast channel received by the plurality of antennas. Storage means for storing a physical channel in a multiplexed signal together with the broadcast channel;
When a desired broadcast channel is designated, a physical channel in the corresponding multiplexed signal is read from the storage means and received by the receiving means, so that a plurality of receiving antennas can be connected to the receiver with a single cable, A high reception characteristic improvement effect can be obtained.

In one embodiment of the present invention, a plurality of antennas for receiving broadcast signals;
Multiplexing means for frequency-multiplexing the received signal of each antenna and sending it to the transmission line;
A plurality of receiving means for receiving a multiplex signal transmitted through the transmission line in tune with an arbitrary channel;
Signal selecting means for selecting any one of the signals of the channels received by the plurality of receiving means;
Demodulation means for demodulating the signal of the channel selected by the signal selection means;
Channel scanning means for causing any one of the plurality of receiving means to scan a plurality of physical channels included in the multiplexed signal;
Storage means for storing, together with the broadcast channel, a physical channel in the multiplexed signal of each received signal of the same broadcast channel received by the plurality of antennas during scanning by the channel scan means;
A comparison means for comparing the reception states obtained by the plurality of reception means and causing the signal selection means to select a signal of a channel received by the reception means having the best reception state;
When a desired broadcast channel is designated, a plurality of physical channels in the corresponding multiplexed signal are read from the storage means and received by the plurality of receiving means, so that a plurality of receiving antennas to receivers are connected to one cable So that the reception characteristics can be improved.

In one embodiment of the present invention, a plurality of antennas for receiving broadcast signals;
Multiplexing means for frequency-multiplexing the received signal of each antenna and sending it to the transmission line;
A plurality of receiving means for receiving a multiplex signal transmitted through the transmission line in tune with an arbitrary channel;
Diversity combining means for combining signals of channels received by each of the plurality of receiving means;
Demodulating means for demodulating the channel signal synthesized by the diversity combining means;
Channel scanning means for causing any one of the plurality of receiving means to scan a plurality of physical channels included in the multiplexed signal;
Storage means for storing, together with the broadcast channel, a physical channel in the multiplexed signal of each received signal of the same broadcast channel received by the plurality of antennas at the time of scanning by the channel scan means;
When a desired broadcast channel is designated, a plurality of physical channels in the corresponding multiplexed signal are read from the storage means and received by the plurality of receiving means, so that a plurality of receiving antennas to receivers are connected to one cable. So that the reception characteristics can be improved.

In one embodiment of the present invention, a plurality of antennas for receiving broadcast signals;
Multiplexing means for frequency-multiplexing the received signal of each antenna and sending it to the transmission line;
A plurality of receiving means for receiving a multiplex signal transmitted through the transmission line in tune with an arbitrary channel;
A plurality of demodulation means for demodulating signals of channels received by the plurality of reception means;
Signal selection means for selecting any one of the signals demodulated by the plurality of demodulation means;
Channel scanning means for causing any one of the plurality of receiving means to scan a plurality of physical channels included in the multiplexed signal;
Storage means for storing, together with the broadcast channel, a physical channel in the multiplexed signal of each received signal of the same broadcast channel received by the plurality of antennas during scanning by the channel scan means;
Comparing means for comparing the reception states obtained by the plurality of demodulating means to cause the signal selection means to select the signal of the channel received by the receiving means having the best reception state,
When a desired broadcast channel is specified, a plurality of physical channels in the corresponding multiplexed signal are read from the storage means and are received by the plurality of reception means, so that a plurality of reception antennas to terrestrial digital broadcast receivers are 1 It can be connected with a cable of a book, and the improvement effect of a high receiving characteristic can be acquired.

  According to the present invention, a plurality of receiving antennas can be connected to a receiver with a single cable, and an improvement effect of high receiving characteristics can be obtained.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows a configuration diagram of an embodiment of a diversity reception system of the present invention. In the figure, UHF band terrestrial digital broadcasting is received by two receiving antennas 11 and 12 installed outdoors.

  The UHF band signal received by the receiving antenna 11 is supplied to the combining unit 13. The UHF band signal received by the receiving antenna 12 is supplied to the frequency conversion unit 14, for example, converted into the SHB (VHF super high band) band and supplied to the synthesis unit 13.

  The synthesizer 13 adds and synthesizes the UHF band signal and the SHB band signal, performs frequency multiplexing, and sends the multiplexed signal to the cable 15. Thus, the multiplexed signal is transmitted from the cable 15 to the diversity receiver 17 through the indoor wiring 16.

  Here, when the terrestrial digital broadcasting is 20ch to 27ch in the UHF band (representing the channel number of the broadcast wave signal), the frequency converter 14 converts the 20ch to 27ch in the UHF band received by the receiving antenna 12 into, for example, SHB (VHF super high (Band) band C23ch to C30ch (C represents a channel number of cable television), or SHB band C50ch to C57ch.

  If digital terrestrial broadcasting is assigned to channels distributed in the UHF band, frequency conversion is performed for each individual channel. The frequency conversion destination band is not limited to the SHB band, and an MID (VHF midband) band may be used, or an empty channel in the UHF band may be used.

<First Embodiment>
FIG. 2 shows a configuration diagram of the first embodiment of the diversity receiver. In the figure, a multiplexed signal is input from the indoor wiring 16 to the terminal 21 and supplied to the tuner unit 22. The FFT output of the channel tuned and received by the tuner unit 22 is demodulated into a TS (Transport Stream) signal by the demodulation unit 23, decoded by the decoding unit 24, and output to a subsequent circuit (not shown).

  FIG. 3 shows a configuration example of the tuner unit 22 and the demodulation unit 23. In the figure, the multiplexed signal is supplied to the frequency conversion unit 31 of the tuner unit 22 where it is mixed with the local oscillation signal supplied from the local oscillator 32 to be an IF (intermediate frequency) signal. Thereafter, the IF signal is digitized by the AD conversion unit 33 and supplied to the FFT unit 34, where it is converted into a frequency domain signal by FFT calculation.

  The frequency domain signal output from the FFT unit 34 is demapped by the demapping unit 35 of the demodulation unit 23, and then decoded and error-corrected by the error correction decoding unit 36 to be output as a TS signal.

  Here, the reception state of terrestrial digital broadcasting can be known from the reception level which is the RF signal level input to the frequency conversion unit 31, for example. For example, it can be known from the MER (modulation error rate) output from the demapping unit 35 and can be known from the BER (bit error rate) output from the error correction decoding unit 36.

  The channel scanning unit 25 shown in FIG. 2 performs automatic channel scanning on the multiplexed signal in a standby state immediately after the receiver is turned off, or at a preset time or every predetermined time. The automatic channel scan is executed while supplying a channel selection control signal from the channel scan unit 25 to the local oscillator 32 of the tuner unit 22 and measuring the reception level or MER or BER from the tuner unit 22.

  The channel scan unit 25 sequentially increases the frequency of the local oscillation signal, for example, from the lowest frequency, and identifies the broadcast channel by using the TS-ID included in the TS signal output from the demodulation unit 23 when a broadcast wave is detected. As well as the reception state (reception level or MER or BER) output from the tuner unit 22 or the demodulation unit 23.

  For example, if it is known in advance that broadcast channels exist in C23ch to C30ch of the SHB band of the multiplexed signal and 20ch to 27ch of the UHF band, even if the TS-ID is not obtained, the C23ch and UHF of the SHB band The 20 channels of the band can be specified as the same broadcast channel (for example, “first broadcast channel”).

  Then, the broadcasting station information (TS-ID) of the channel in which the broadcast wave is detected is assigned to the designated remote control key number, and the detected physical channel (frequency of the local oscillation signal) and the reception state are written in the channel memory 26 shown in FIG. Remember me. The reception state may be temporarily written and held in a memory different from the channel memory 26. The channel memory 26 is a nonvolatile memory.

  Therefore, each broadcast channel in the SHB band received by the receiving antenna 12 is written in the channel memory 26 first. Next, when receiving each UHF band broadcast channel received by the receiving antenna 11, the broadcast station information (TS-ID) in which the broadcast station information (TS-ID) of the received broadcast wave is written in the channel memory 26 is received. ), The reception state of the received broadcast wave is compared with the reception state of the channel written in the channel memory 26, and the reception state of the received broadcast wave is good (the reception level is high or the MER is high). Only when the BER is low), the received broadcast wave physical channel is written into the physical channel of the channel in the channel memory 26 and updated.

  Thus, the channel memory 26 stores the physical channel of the antenna having the better reception state among the reception antennas 11 and 12 in association with the broadcast station information and the remote control key number.

  After the setting of the channel memory 26 described above, when the user operates a remote control key (not shown) to specify the channel selection of a desired channel, the remote control key number is input to a channel selection control unit (not shown) in the tuner unit 22 to select the channel. The control unit searches the channel memory 26 with the remote control key number to obtain a physical channel (frequency of the local oscillation signal), and sets the physical channel in the local oscillator 32, so that the receiving state of the receiving antennas 11 and 12 is received. The better one can be received.

  In addition, by performing automatic channel scanning on multiple signals at a preset time or every fixed time after the receiver is turned off, it is possible to cope with changes in the reception state, and the antenna with the better reception state can be handled. The physical channel can store the broadcast station information and the remote control key number in the channel memory 26.

<Second Embodiment>
FIG. 5 shows a configuration diagram of a second embodiment of the diversity receiver. In the figure, the same parts as those in FIG. In FIG. 5, a multiplexed signal is input to the terminal 21 from the indoor wiring 16 and supplied to the tuner units 22A and 22B. The tuner units 22A and 22B have the same configuration as the tuner unit 22.

  The FFT output of the channel tuned and received by each of the tuner units 22A and 22B is supplied to the signal selection unit 40, and either one is selected. The selected FFT output is demodulated into a TS signal by the demodulator 23, decoded by the decoder 24, and output to a subsequent circuit (not shown).

  The channel scan unit 41 performs an automatic channel scan on the multiplexed signal in a standby state immediately after the receiver is turned off, or at a preset time or every predetermined time. The automatic channel scan is executed by supplying a channel selection control signal from the channel scan unit 41 to one of the tuner units 22A and 22B, for example, the local oscillator 32A of the tuner unit 22A. In the automatic channel scan, the signal selection unit 40 selects the output of the tuner unit 22A.

  The channel scan unit 41 sequentially increases the frequency of the local oscillation signal, for example, from the lowest frequency, and specifies the broadcast channel by using the TS-ID included in the TS signal output from the demodulation unit 23 when a broadcast wave is received. As well as the reception state (reception level or MER or BER) output from the tuner unit 22A or the demodulation unit 23.

  Then, broadcast station information (TS-ID) of the channel in which the broadcast wave is detected is assigned to the designated remote control key number, and the detected physical channel (frequency of the local oscillation signal) is the first physical channel in the channel memory 42 shown in FIG. Alternatively, it is written and stored in the second physical channel.

  In this case, although the channel of the same TS-ID is detected twice, the reception state at that time is temporarily written and held in a memory different from the channel memory 42 (or an empty area in the channel memory 42). At that time, the storage contents are switched so that the physical channel with the better reception state is stored in the first physical channel and the other physical channel is stored in the second physical channel. The channel memory 42 is a nonvolatile memory.

  For this reason, the first and second physical channels received by the receiving antennas 11 and 12 are stored in the channel memory 42 in correspondence with the remote control key numbers.

  The comparison unit 43 causes the signal selection unit 40 to select the output of the tuner unit 22A in the initial state. Thereafter, the comparison unit 43 compares the reception state (reception level) output from the tuner unit 22A with the reception state (reception level) output from the tuner unit 22B, and performs switching control of the signal selection unit 40 according to the comparison result. Do.

  That is, the comparison unit 43 signals that the output of the tuner unit 22B is selected if the reception state of the tuner unit 22A is worse than a predetermined threshold value and the reception state of the tuner unit 22B is better than the reception state of the tuner unit 22A. Switching control of the selection unit 40 is performed. Further, in this state, if the reception state of the tuner unit 22B is worse than a predetermined threshold value and the reception state of the tuner unit 22A is better than the reception state of the tuner unit 22B, the signal selection is performed so that the output of the tuner unit 22B is selected. Switching control of the unit 40 is performed.

  After the setting of the channel memory 42, when the user operates a remote control key (not shown) to specify the channel selection of a desired channel, the remote control key number is input to the channel selection control unit (not shown) in the tuner units 22A and 22B. The tuning control units of the tuner units 22A and 22B search the channel memory 42 with the remote control key number to obtain the first and second physical channels (frequency of the local oscillation signal).

  The tuner unit 22A performs reception by setting the first physical channel to the local oscillator 32A, and the tuner unit 22B performs reception by setting the second physical channel to the local oscillator 32B. As described above, the comparison unit 43 compares the reception state (reception level) output from the tuner unit 22A with the reception state (reception level) output from the tuner unit 22B, and the reception state is good (reception level) from the comparison result. By controlling the signal selector 40 so as to select the higher tuner output, the FFT output having the better reception state is demodulated by the demodulator 23, decoded by the decoder 24, and output. The

  In this embodiment, when one reception state selected by the signal selection unit 40 among the tuner units 22A and 22B is worse than the other reception state during viewing of the television, the signal selection unit 40 has a good reception state. By switching to this direction, the reception state of the desired channel can be improved in real time.

  When, for example, MER or BER other than the reception level is used as the reception state, the demodulation units (23A, 23B) are arranged at the subsequent stages of the tuner units 22A, 22B, and the outputs of the respective demodulation units (23A, 23B). The TS selection signal is supplied to the signal selection unit 40, and the comparison unit 43 compares the MER or BER supplied from the demodulation unit (23A, 23B) to perform selection control of the signal selection unit 40, and the signal selection unit 40 selects the signal. The TS signal is supplied to the decoder unit 24.

<Third Embodiment>
FIG. 7 shows a configuration diagram of a third embodiment of the diversity receiver. In the figure, the same parts as those in FIG. In FIG. 7, a multiplexed signal is input to the terminal 21 from the indoor wiring 16 and supplied to the tuner units 22A and 22B. The tuner units 22A and 22B have the same configuration as the tuner unit 22.

  The FFT outputs of the channels tuned and received by the tuner units 22A and 22B are supplied to the diversity combining unit 50 and combined. The combined FFT output is demodulated into a TS signal by the demodulator 23, decoded by the decoder 24, and output to a subsequent circuit (not shown).

  FIG. 8 shows a configuration example of the diversity combining unit 50. In the figure, terminals 51 and 52 are supplied with frequency domain signals output from the tuner units 22A and 22B, and are supplied to the synthesis unit 53 and the transmission path estimation unit 54.

  The transmission path estimation unit 54 performs transmission path estimation based on the frequency domain signals from the terminals 51 and 52. In digital terrestrial broadcasting, OFDM (Orthogonal Frequency Division Multiplexing) signals are used. The transmission path estimation unit 54 extracts a pilot carrier inserted for equalization in the OFDM signal from the frequency domain signals from the terminals 51 and 52, and uses the extracted pilot carrier as a reference pilot signal (internal reference pilot carrier generation). To generate a propagation path characteristic that is a variation in amplitude and phase received in the propagation path. Then, the propagation path characteristic of each data carrier between pilot carriers is estimated from the propagation path characteristic of the pilot carrier by interpolation and supplied to the weighting unit 55.

  Based on the OFDM carrier (pilot carrier and data carrier) levels estimated from the signals in the frequency domain from the terminals 51 and 52, the weighting unit 55 is configured so that the weighting coefficient increases as the OFDM carrier level increases. A combining weighting coefficient for each frequency domain signal from 52 is calculated for each OFDM carrier and supplied to the combining unit 53.

  The combining unit 53 performs diversity combining by multiplying each of the frequency domain signals from the terminals 51 and 52 by a weighting coefficient for each OFDM carrier, and adds the weighted coefficient, and outputs the result from the terminal 56.

  The channel scan unit 41 performs an automatic channel scan on the multiplexed signal in a standby state immediately after the receiver is turned off, or at a preset time or every predetermined time. The automatic channel scan is executed by supplying a channel selection control signal from the channel scan unit 41 to one of the tuner units 22A and 22B, for example, the local oscillator 32A of the tuner unit 22A.

  The channel scan unit 41 sequentially increases the frequency of the local oscillation signal, for example, from the lowest frequency, and specifies the broadcast channel by using the TS-ID included in the TS signal output from the demodulation unit 23 when a broadcast wave is received. As well as the reception state (reception level or MER or BER) output from the tuner unit 22A or the demodulation unit 23.

  Then, the broadcasting station information (TS-ID) of the channel that detected the broadcast wave is assigned to the designated remote control key number, and the detected physical channel (frequency of the local oscillation signal) is the first physical channel of the channel memory 42 shown in FIG. Alternatively, it is written and stored in the second physical channel.

  In this case, although the channel of the same TS-ID is detected twice, the reception state at that time is temporarily written and held in a memory different from the channel memory 42 (or an empty area in the channel memory 42). At that time, the storage contents are switched so that the physical channel with the better reception state is stored in the first physical channel and the other physical channel is stored in the second physical channel.

  For this reason, the first and second physical channels received by the receiving antennas 11 and 12 are stored in the channel memory 42 in correspondence with the remote control key numbers.

  After the setting of the channel memory 42, when the user operates a remote control key (not shown) to specify the channel selection of a desired channel, the remote control key number is input to the channel selection control unit (not shown) in the tuner units 22A and 22B. The tuning control units of the tuner units 22A and 22B search the channel memory 42 with the remote control key number to obtain the first and second physical channels (frequency of the local oscillation signal).

  The tuner unit 22A performs reception by setting the first physical channel to the local oscillator 32A, and the tuner unit 22B performs reception by setting the second physical channel to the local oscillator 32B. Diversity combining section 50 combines the FFT outputs obtained by tuner sections 22A and 22B. The combined FFT output is demodulated into a TS signal by the demodulator 23, decoded by the decoder 24, and output to a subsequent circuit (not shown).

  In this embodiment, by synthesizing and demodulating the FFT outputs of the tuner units 22A and 22B, it is possible to always receive a desired channel in an optimal state.

  In the above embodiment, two reception antennas are used, but three or more reception antennas may be used. For example, when there are three receiving antennas, the UHF band 20ch to 27ch received by the first antenna is used as it is, and the UHF band 20ch to 27ch received by the second antenna is converted to, for example, the SHB band C23ch to C30ch. Then, the UHF band 20ch to 27ch received by the third antenna is frequency-converted to, for example, the SHB band C50ch to C57ch. In the second and third embodiments, it is only necessary to provide as many tuner units as the number of antennas.

  In the above embodiment, the synthesizer 13 and the frequency converter 14 are used as an example of a multiplexing unit, the tuner units 22, 22A, and 22B are used as an example of a receiving unit, and the signal selection unit 40 is used as an example of a signal selection unit. The demodulating unit 23 is used as an example of the demodulating unit, the channel scanning units 25 and 41 are used as an example of the channel scanning unit, the channel memories 26 and 42 are used as an example of the storing unit, and the comparing unit 43 is used as an example of the comparing unit. The diversity combining unit 50 is used as an example of the diversity combining means.

It is a block diagram of one Embodiment of the diversity reception system of this invention. It is a block diagram of 1st Embodiment of a diversity receiver. It is a figure which shows the structural example of a tuner part and a demodulation part. It is a figure which shows the memory content of a channel memory. It is a block diagram of one Embodiment of the diversity reception system of this invention. It is a figure which shows the memory content of a channel memory. It is a block diagram of 3rd Embodiment of a diversity receiver. It is a figure which shows the structural example of a diversity synthetic | combination part. It is a figure which shows the memory content of a channel memory.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11, 12 Reception antenna 13 Synthesis | combination part 14 Frequency conversion part 15 Cable 16 Indoor wiring 17 Diversity receiver 22,22A, 22B Tuner part 23 Demodulation part 24 Decoder part 25,41 Channel scan part 26,42 Channel memory 31 Frequency conversion part 32 Local oscillator 33 AD converter 34 FFT unit 35 Demapping unit 36 Error correction decoding unit 40 Signal selection unit 43 Comparison unit 50 Diversity combining unit 53 Combining unit 54 Transmission path estimating unit 55 Weighting unit

Claims (4)

A plurality of antennas for receiving broadcast signals;
Multiplexing means for frequency-multiplexing the received signal of each antenna and sending it to the transmission line;
Receiving means for receiving a multiplex signal transmitted through the transmission line in tune with an arbitrary channel;
Demodulation means for demodulating the signal of the channel received by the receiving means;
Channel scanning means for causing the receiving means to scan a plurality of physical channels included in the multiplexed signal;
Based on the reception state obtained by the reception unit or the demodulation unit during scanning by the channel scanning unit, the reception signal having the best reception state among the reception signals of the same broadcast channel received by the plurality of antennas. Storage means for storing a physical channel in a multiplexed signal together with the broadcast channel;
When a desired broadcast channel is designated, a diversity receiving system, wherein a physical channel in the corresponding multiplexed signal is read from the storage means and is received by the receiving means. A plurality of antennas for receiving broadcast signals;
Multiplexing means for frequency-multiplexing the received signal of each antenna and sending it to the transmission line;
A plurality of receiving means for receiving a multiplex signal transmitted through the transmission line in tune with an arbitrary channel;
Signal selecting means for selecting any one of the signals of the channels received by the plurality of receiving means;
Demodulation means for demodulating the signal of the channel selected by the signal selection means;
Channel scanning means for causing any one of the plurality of receiving means to scan a plurality of physical channels included in the multiplexed signal;
Storage means for storing, together with the broadcast channel, a physical channel in the multiplexed signal of each received signal of the same broadcast channel received by the plurality of antennas during scanning by the channel scan means;
A comparison means for comparing the reception states obtained by the plurality of reception means and causing the signal selection means to select a signal of a channel received by the reception means having the best reception state;
A diversity receiving system, wherein when a desired broadcast channel is designated, a plurality of physical channels in the corresponding multiplexed signal are read from the storage means and received by the plurality of receiving means. A plurality of antennas for receiving broadcast signals;
Multiplexing means for frequency-multiplexing the received signal of each antenna and sending it to the transmission line;
A plurality of receiving means for receiving a multiplex signal transmitted through the transmission line in tune with an arbitrary channel;
Diversity combining means for combining signals of channels received by each of the plurality of receiving means;
Demodulating means for demodulating the channel signal synthesized by the diversity combining means;
Channel scanning means for causing any one of the plurality of receiving means to scan a plurality of physical channels included in the multiplexed signal;
Storage means for storing, together with the broadcast channel, a physical channel in the multiplexed signal of each received signal of the same broadcast channel received by the plurality of antennas at the time of scanning by the channel scan means;
A diversity receiving system, wherein when a desired broadcast channel is designated, a plurality of physical channels in the corresponding multiplexed signal are read from the storage means and received by the plurality of receiving means. A plurality of antennas for receiving broadcast signals;
Multiplexing means for frequency-multiplexing the received signal of each antenna and sending it to the transmission line;
A plurality of receiving means for receiving a multiplex signal transmitted through the transmission line in tune with an arbitrary channel;
A plurality of demodulation means for demodulating signals of channels received by the plurality of reception means;
Signal selection means for selecting any one of the signals demodulated by the plurality of demodulation means;
Channel scanning means for causing any one of the plurality of receiving means to scan a plurality of physical channels included in the multiplexed signal;
Storage means for storing, together with the broadcast channel, a physical channel in the multiplexed signal of each received signal of the same broadcast channel received by the plurality of antennas during scanning by the channel scan means;
Comparing means for comparing the reception states obtained by the plurality of demodulating means to cause the signal selection means to select the signal of the channel received by the receiving means having the best reception state,
A diversity receiving system, wherein when a desired broadcast channel is designated, a plurality of physical channels in the corresponding multiplexed signal are read from the storage means and received by the plurality of receiving means.

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