JP2003274296A - Broadcast receiving facility and diversity receiving system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technology which enables broadcasting reception with a diversity technology by using an existing broadcast receiving facility without installing additional signal cables. <P>SOLUTION: A broadcast receiving facility is equipped with more than two antennas that receive a broadcast wave of the same frequency band, a first conversion means that converts, at least, one of frequency bands for feed signals fed through the antenna into the frequency band which is different from the received frequency band, a mixing means that mixes the feed signals, the frequencies of which are converted, and the feed signals from the antenna, the frequencies of which are not converted, and a feed line that transfers the feed signals output from the mixing means to an image receiving site. The broadcast receiving facility is also equipped with a distributing means that distributes the feed signals transferred with the feed line to the feed signals of which frequencies are converted and to the feed signals of which frequencies are not converted, and a second conversion means that converts the feed signals being distributed, the frequencies of which are converted, to the feed signal, the frequency band of which is the receiving frequency band. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diversity receiver, and more particularly to a technique effective for improving reception performance using an existing facility.

[0002]

2. Description of the Related Art A signal cable for receiving television broadcasting is installed as a broadcasting receiving facility at the time of construction in a majority of existing buildings such as houses for general living such as detached houses and condominiums. Is common.

This conventional residential broadcast receiving facility is a VH.
A power supply signal output from an antenna that receives broadcast waves in the F band, UHF band, satellite broadcast band, and the like is supplied to wall surface terminals arranged in each room. That is, the broadcast receiving facility for a house receives a plurality of receiving branches (antennas) for receiving broadcast waves in the VHF band, the UHF band, the satellite broadcasting band, and the like, and a power supply signal that is the received power received by each antenna. The mixer for mixing, the signal cable for transmitting the power supply signal mixed by the mixer to the wall terminal inside the room, and the mixer are arranged between the mixer and the wall terminal, and the mixed power signal is branched into two or more. It is composed of a switch and the like.

On the other hand, the feeding signal fed to the wall surface terminal is
First, the distributor connected to the wall surface terminal distributes the power supply signals in the VHF band, the UHF band, the satellite broadcasting band, and the like.
The power supply signals distributed to the power supply signals of the respective frequency bands are input to the input terminals of the respective frequency bands arranged in the receiving device by the signal cable. At this time, since the distributor is provided with a plurality of output terminals corresponding to the frequency bands, by connecting each output terminal and the input terminal corresponding to the frequency band of the receiving device with a signal cable, a plurality of output terminals can be provided. The power feeding signal received by the antenna is transmitted to the receiving device.

As described above, in the conventional broadcast receiving equipment, the broadcast waves received by the plurality of antennas are mixed by the mixer so that they are transmitted to the wall surface terminal by one signal cable. However, in conventional residential broadcast receiving equipment, the frequency band of the broadcast wave received by each antenna is different, so it is possible to transmit the power supply signal with a single signal cable by using a mixer. Has become.

[0006]

The present inventor has found the following problems as a result of examining the above-mentioned prior art. 20
Terrestrial digital broadcasting, which is scheduled to start broadcasting from 2003, uses the UHF band whose frequency is higher than the VHF band used for the current terrestrial analog broadcasting. Here, in television broadcasting to which digital technology such as terrestrial digital broadcasting is applied, if the propagation fluctuation is less than or equal to the allowable value, it is possible to correct the code error due to the propagation fluctuation by a technique such as coding. Quality broadcast reception is possible. On the other hand, when the propagation fluctuation exceeds the allowable value, the original data cannot be reproduced, and thus the reception of the broadcast itself may be impossible.

Therefore, in order to receive terrestrial digital broadcasting, it becomes impossible to reproduce the original data.
That is, it is necessary to compensate for the deterioration in reception performance due to propagation fluctuations that make it impossible to receive the broadcast itself.

A diversity technique is available as a method for compensating for the deterioration of the reception performance due to the propagation fluctuation. This diversity technology uses multiple feed antennas and uses the feed signal received by the antenna that gives the best feed signal among the feed signals received by each antenna, or the feed signal received by each antenna. Is synthesized and used.

As described above, in order to introduce the diversity technique, a receiver compatible with the diversity technique and at least two antennas are required. In this diversity technology, two antennas receive broadcast waves in the same frequency band, so the feed signals received by each antenna are received via the feed line (signal cable) connected to each antenna. Must be entered on the device.

On the other hand, as described above, the broadcasting receiving equipment of the majority of existing buildings, such as houses for general living, is not supposed to transmit the power feeding signal of the same frequency band, so that the diversity is provided. 2 to introduce technology
It is necessary to newly provide a signal cable for transmitting at least one of the power supply signals received by the book antenna.

However, in order to arrange a signal cable in an existing building in the same manner as the signal cable arranged at the time of construction (that is, so as not to spoil the view of the room), it is necessary to arrange the signal cable in the back wall or the ceiling. It is not so common because it requires relatively large-scale construction. For this reason, in the conventional signal cable laying work, it is common to lay the signal cable in a relatively inconspicuous place inside the house by storing it in a cable cover or the like. However, in the case where one TV is installed in each room as in the present situation, the amount of signal cables to be installed is large, and there is concern that the view of the room will be impaired. There is.

An object of the present invention is to provide a technique capable of receiving a broadcast to which a diversity technique is applied by using an existing broadcast receiving facility without disposing a new signal cable.

[0013]

Among the inventions disclosed in the present application, a brief description will be given to the outline of typical ones.
It is as follows.

(1) Two or more antennas that receive broadcast waves in the same frequency band, and a frequency band different from the frequency band in which the frequency of at least one of the power supply signals supplied from the antennas is received. A first conversion means for converting the power supply signal to the first conversion means, a mixing means for mixing a power supply signal frequency-converted by the first conversion means and a power supply signal not frequency-converted from the antenna, and one end side of which is connected to the mixing means. A power supply line for transmitting a power supply signal output from the mixing means to an image receiving point, a power supply signal arranged at the other end of the power supply line for transmitting the frequency-converted power supply signal and the frequency-unconverted power supply signal. Distributing means for distributing, and a second conversion for converting the frequency-converted power-supply signal among the power-supply signals distributed by the distributor into a power-supply signal in a received frequency band. Broadcast reception equipment that includes a stage.

(2) Two or more antennas for receiving broadcast waves in the same frequency band, and a power feeding signal received by an antenna that can obtain a good power feeding signal among the power feeding signals fed from the antennas are selected. Alternatively, in a diversity receiving device including a receiving means having a means for combining and using the power feeding signals received by the antenna, at least one power feeding signal frequency of the power feeding signals fed from the antenna is received. A first conversion means for converting into a frequency different from the frequency band; a mixing means for mixing the power-supply signal frequency-converted by the first conversion means with a power-supply signal not frequency-converted from the antenna; A power supply line for transmitting the power supply signal to the image receiving point, and the power supply signal for the frequency conversion and the frequency conversion for the transmitted power supply signal. And distribution means for distributing to the power supply signal,
A second conversion unit for converting the frequency-converted power supply signal among the power supply signals distributed by the distribution unit into a received power supply signal in a frequency band.

According to the above-mentioned means, the first conversion means first receives the frequency of at least one power supply signal with respect to the power supply signals of the broadcast waves in the same frequency band received by the two or more antennas. To a frequency different from the frequency band. Next, the mixing means mixes the power-supply signal whose frequency is converted by the first conversion means and the power-supply signal which is not frequency-converted from the antenna, and outputs the mixed power-supply signal to the power supply line which transmits to the image receiving part.

Distribution means is provided on the other end side of the power supply line, that is, on the image receiving side, and the distribution means distributes the transmitted power supply signal to the frequency-converted power supply signal and the frequency-unconverted power supply signal. Next, among the power supply signals distributed by the distribution means, the frequency-converted power supply signal is converted into the power supply signal in the received frequency band by the second conversion means, so that one power supply signal is supplied. Even in the existing residential broadcast receiving facility where only electric wires are installed, the broadcast receiving facility that transmits the power supply signals of the same frequency band received by different antennas required for diversity from the outdoors to the indoors You can

Here, means for selecting a power supply signal received by the antenna from which a good power supply signal is obtained, among the power supply signals of the same frequency band supplied from a plurality of antennas, and /
Alternatively, a power supply signal which is not frequency converted and which is distributed by the distribution means to the power supply signal input of the receiving means having a means for combining and using a plurality of power supply signals of the same frequency band, and a power supply signal whose frequency is converted by the second conversion means. By inputting and, the receiving means can select a good power feeding signal from the power feeding signals from the two or more antennas, or can synthesize and use two or more power feeding signals in the same frequency band. As a result, the receiving unit can receive the broadcast wave well.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the drawings together with an embodiment (example) of the invention. In all the drawings for explaining the embodiments of the invention, components having the same function are designated by the same reference numeral, and the repeated description thereof will be omitted.

FIG. 1 is a diagram for explaining a schematic configuration of a diversity receiving apparatus according to an embodiment of the present invention.
However, FIG. 1 is a diagram showing a case in which the present invention is applied to a single-family house among houses for general living.

In FIG. 1, 1 is a cross Yagi antenna,
2 is the first signal cable, 3 is the second signal cable, 4
Is a first frequency converter (first conversion means), 5 is a third signal cable, 6 is a signal combiner (mixing means), and 7 is a fourth
Signal cable (feed line), 8 a signal distributor (distribution means), 9 a fifth signal cable, 10 a sixth signal cable, 11 a second frequency converter (second conversion means),
Reference numeral 12 is a seventh signal cable, 13 is a diversity receiver (reception means), and 14 is a house.

The diversity receiver of this embodiment is
The broadcast receiving equipment for transmitting the power supply signals of the two broadcast waves of the same frequency band received by the well-known cross Yagi antenna 1 from the outdoor of the house 14 to the indoor, and the best of the two power supply signals arranged indoors And diversity reception equipment that uses power supply signals to obtain various power supply signals. Needless to say, the diversity receiving facility may be configured to combine and use two power feed signals.

As shown in FIG. 1, the broadcast receiving equipment of this embodiment has a cross Yagi antenna 1 having two receiving branches (antennas) for receiving terrestrial digital broadcast waves, and a feed signal received by one antenna. To the frequency converter 4, a first signal cable 2 for transmitting the power feeding signal received by the other antenna to the signal synthesizer 6, and a frequency of the power feeding signal set in advance. A first frequency converter 4 for converting into a signal, a third signal cable 5 for transmitting the frequency-converted feed signal output from the first frequency converter 4 to the signal combiner 6, and a second signal cable A known signal synthesizer 6 for synthesizing (mixing) the frequency-converted feed signal transmitted by the third signal cable and the frequency-converted feed signal transmitted by the third signal cable, and the synthesized signal output from the signal synthesizer 6. The fourth signal cable 7, which is an existing facility for pulling a power supply signal (hereinafter, referred to as a composite power supply signal) from the outside of the house 14 to the inside of the house 14, and the frequency of the composite power supply signal transmitted by the fourth signal cable 7. A known signal distributor 8 that distributes the unconverted power supply signal and the frequency-converted power supply signal, and the frequency-converted power supply signal output from the signal distributor 8 is transmitted to the second frequency converter 11. It is composed of a sixth signal cable 10 and a second frequency converter 11 that converts the frequency of the frequency-converted feed signal into the original frequency. Further, the diversity receiving equipment transmits the power-supply signal, which is not frequency-converted, output from the signal distributor 8 (power-supply signal received by the other antenna) to the diversity receiver 13, which is the fifth signal cable 9
And a seventh signal cable 12 for transmitting the feed signal (the feed signal received by one antenna) frequency-converted to the original frequency by the second frequency converter 11, and the diversity receiving operation is performed. It is composed of a well-known diversity receiver 13.

In this embodiment, the broadcast receiving equipment includes the signal distributor 8, the second frequency converter 11, and the sixth signal cable 10. However, for example, the diversity receiver 13 may be incorporated therein. It goes without saying that it may be configured. With such a configuration, the configuration of the diversity receiving device, particularly on the indoor side, can be simplified. Further, in the present embodiment, the signal distributor 8 is directly connected to the fourth signal cable 7, but in the existing broadcast receiving equipment, a wall surface terminal (not shown) is arranged in the middle of the fourth signal cable 7. It goes without saying that, by connecting a signal cable to this wall surface terminal, the power supply signal transmitted to the fourth signal cable 7 is taken out.
Moreover, in the case of newly building a house 14 to which the present invention is applied, a cross Yagi antenna 1, a first signal cable 2, a second signal cable 3, a first frequency converter 4, and a third signal cable 5, the signal combiner 6, the fourth signal cable 7, and the wall surface terminal are provided in advance as broadcast receiving equipment, and the signal distributor 8, the fifth signal cable 9, the sixth signal cable 10, as required. Second frequency converter 1
By adopting the configuration using the first and seventh signal cables 12 and the diversity receiver 13, the diversity technology can be introduced only by changing the indoor side.

The cross Yagi antenna 1 is a well-known antenna in which a horizontal polarization receiving antenna for receiving broadcast waves of the same frequency band and a vertical polarization receiving antenna are integrally formed. Therefore, the power supply signal that is the received power that receives the horizontally polarized broadcast wave (terrestrial digital broadcast wave) and the power supply signal that is the received power that receives the vertically polarized broadcast wave are output separately. However, in the following description, a power supply signal that receives a horizontally polarized broadcast wave (hereinafter, referred to as a first power supply signal) is output to the first signal cable 1 and a power signal that receives a vertically polarized broadcast wave is supplied. A case where a signal (hereinafter, referred to as a second power supply signal) is output to the second signal cable 3 will be described, but it goes without saying that the reverse may be the case.

The first frequency converter 4 and the second frequency converter 11 are, for example, a well-known OFDM (Orthogonal Frequency Division Multiplexing) demodulator, and an oscillating circuit based on a signal output from this OFDM demodulator. , The signal output from this oscillator circuit (hereinafter referred to as local signal) is used as a reference signal,
The input signal (first power supply signal) is converted to a preset frequency, or the frequency-converted power supply signal is converted to the original frequency. The details of the first frequency converter 4 and the second frequency converter 11 will be described later.

Next, with reference to FIG. 1, the operation of receiving terrestrial digital broadcasting by the diversity receiving apparatus of this embodiment will be described.

The first power feed signal obtained by receiving the horizontally polarized broadcast wave is input to the first frequency converter 4 via the first signal cable 2. The first power supply signal input to the first frequency converter 4 is generated by the first frequency converter 4 that operates in synchronization with the frequency reference signal of terrestrial digital broadcasting extracted from the first power supply signal itself. It is converted into a power supply signal of another preset frequency. The frequency-converted first power supply signal is output to the signal combiner 6 via the third signal cable 5.

On the other hand, of the broadcast waves received by the cross Yagi antenna 1, the second feed signal obtained by receiving the vertically polarized broadcast wave is directly transmitted via the second signal cable 3. To the signal synthesizer 6. The frequency-converted first power feed signal and second power feed signal input to the signal synthesizer 6 are synthesized (mixed). In addition, in the diversity receiving apparatus of the present embodiment, up to the signal combiner 6 is the broadcast receiving equipment installed outdoors.

The combined feed signal output from the signal combiner 6 is transmitted indoors through a fourth signal cable 7 which is an existing facility for pulling the feed signal from the outside of the house 14 to the inside of the house 14, for example, as shown in the figure. The signal is output to the signal distributor 8 via a wall terminal or the like. The combined power supply signal input to the signal distributor 8 is distributed to the second power supply signal having the frequency of the terrestrial digital broadcast wave and the first power supply signal after frequency conversion. The second power supply signal, which is one of the distributed power supply signals, is output to the diversity receiver 13 via the fifth signal cable 9 as a power supply signal for the second broadcast wave. On the other hand, the first power supply signal after frequency conversion, which is one of the distributed power supply signals, is transmitted to the second power supply signal via the sixth signal cable 10.
Is output to the frequency converter 11.

The first frequency-converted first power supply signal input to the second frequency converter 11 operates in synchronization with the frequency reference signal extracted from the frequency-converted first power supply signal itself. Is converted into the first power supply signal which is the power supply signal of the original frequency (frequency of terrestrial digital broadcasting). The first power supply signal is output to the diversity receiver 13 via the seventh signal cable 12 as a power supply signal for the first broadcast wave.

The first input to the diversity receiver 13
As the power feeding signal and the second power feeding signal, the power feeding signal having the smaller propagation fluctuation is selected by the well-known diversity receiving technique for each carrier of the OFDM signal. However, the diversity receiving technique is not limited to the receiving technique for each carrier of the OFDM signal.

FIG. 2 is a diagram for explaining the schematic configuration of the frequency converter according to the present embodiment. However, the first frequency converter 4 and the second frequency converter 11 have the same configuration except that the conversion frequency of the frequency conversion unit 22 is different. Therefore, in the following description, the first frequency converter 4 will be described. Only 4 will be described.

As shown in FIG. 2, the first frequency converter 4 of the present embodiment has a well-known branching unit 16 for branching the feed signal input from the input terminal 15 into two, and one of the branched ones. The input signal is the first branch signal 17 which is the power supply signal of the above, and the frequency reference signal extraction unit 18 that extracts the frequency reference signal 19 from the first branch signal 17 and the output signal (local signal as the reference signal of the oscillator) Signal 21)
The frequency of the well-known oscillating unit 20 that adjusts and outputs the frequency of No. 2 to a preset frequency and the frequency of the second branch signal 24 that is the other power supply signal branched by the branch unit 16 with the local signal 21 as a reference are converted. It is composed of a well-known frequency conversion unit 22 that outputs to an output terminal 23.

However, the frequency reference signal extracting section 18 of the present embodiment can be constituted by a part of the OFDM demodulation circuit shown in FIG. 4, for example. However, the frequency reference signal extraction unit 18 shown in FIG.
21 3.0 version ”on page 14 of the reception block diagram. Further, in the following description, an arbitrary channel can be selected as the reception channel.

In the OFDM demodulation circuit, the first branch signal 17 (input from the input terminal 413), which is the OFDM signal branched by the branching section 16, is converted into a signal from the first oscillation circuit 402 and the frequency converter 401 is used. After the frequency conversion from the UHF band to 57 MHz which is the first intermediate frequency, the IF (Inter
A median frequency (Frequency) circuit 403 performs filter amplification. Next, after the frequency converter 404 frequency-converts the amplified signal with the signal from the second oscillation circuit 405 to the second intermediate frequency, the A / D converter 406 is used.
Convert to digital signal with. The OFDM signal converted into this digital signal is orthogonally demodulated by the orthogonal demodulator 407. The demodulated signal is input to the FFT 408 and the sync reproduction circuit 409, respectively. Synchronous reproduction circuit 409
Then, an OFDM symbol synchronization signal (symbol signal) and a signal of FFT sample frequency (clock signal) are reproduced from the orthogonally demodulated signal according to the Mode and the guard interval length. Here, in the present embodiment, the clock signal and the symbol signal supplied from the synchronous reproduction circuit 409 to the FFT 408 are taken out from the first take-out terminal 411 and used as the frequency reference signal.

On the other hand, the FFT 408 solves the OFDM multiplexing by executing the fast Fourier transform (FFT) for the period corresponding to the effective symbol in the OFDM symbol. Of the outputs from this FFT 408, TMC
C (Transmission and Multip)
lexing Configuration Cont
signal) is input to the frame extracting means 410.
The frame extraction means 410 extracts the frame synchronization signal and inputs it to the synchronization reproduction circuit 409. Therefore, in this embodiment, it is supplied to the synchronous reproduction circuit 409. A frame synchronization signal (frame signal) may be extracted from the second extraction terminal 412 and used as a frequency reference signal.

As described above, the frequency reference signal extracting section 18 of the present embodiment uses the clock signal, the symbol signal or the frame signal extracted from the power feeding signal of the terrestrial digital broadcasting to make the first and second frequency converters. Performs frequency conversion, it is possible to cancel the frequency deviation caused by the frequency conversion. Furthermore, since the signal obtained from the highly reliable signal used for image reproduction is used as the frequency reference signal, it is possible to minimize the frequency fluctuation associated with the first and second frequency converters.

Next, the frequency conversion operation by the first frequency converter 4 of the present embodiment will be described with reference to FIG.

When the power feeding signal is input from the input terminal 15, first, the power feeding signal is branched by the branching unit 16 into the first branch signal 17 and the second branch signal 24. The first branch signal 17 is input to the frequency reference signal extraction unit 18,
Only the frequency reference signal 19 in the terrestrial digital broadcasting demodulated by the OFDM demodulation circuit is taken out. The extracted frequency reference signal 19 is input to the oscillating unit 20, and the oscillating unit 2
It is used as a reference signal of 0 and a local signal 21 is generated and output. The local signal 21 is a frequency conversion unit 22.
And becomes a reference signal for frequency conversion by the frequency conversion unit 22. On the other hand, the second branch signal 24 separated by the branch unit 16 is input to the frequency conversion unit 22, converted to a preset frequency, and output from the output terminal 23 as a frequency-converted feed signal.

As described above, in the first frequency converter 4 of the present embodiment, the local signal 21 synchronized with the frequency reference signal extracted from the power feeding signal itself input to the first frequency converter 4 is generated. Based on this, the power supply signal is converted into a preset frequency, so that high frequency stability can be obtained.

Also, the second frequency converter 11 arranged indoors is also based on the local signal 21 synchronized with the frequency reference signal extracted from the frequency-converted feed signal.
The frequency-converted power supply signal is converted into the power supply signal of the original frequency. That is, since the frequency conversion is performed using the same signal as the frequency reference signal extracted from the power supply signal of the terrestrial digital broadcasting as a reference, it is possible to cancel the frequency deviation caused by the first and second frequency converters 4 and 11. It will be possible.

As described above, in the diversity receiver of the present embodiment, first, the first frequency converter 4 receives the feed signals of the broadcast waves in the same frequency band received by the cross Yagi antenna 1. Converts the frequency of the first power supply signal, which is one of the power supply signals, into a frequency different from the received frequency band. Next, the signal synthesizer 6 synthesizes (mixes) the first power feed signal whose frequency is converted by the first frequency converter 4 and the power feed signal (second power feed signal) from the cross Yagi antenna 1 which is not frequency converted. Then, the combined power supply signal (composite power supply signal) is output to the fourth signal cable 7 which is a power supply line for transmitting to the image receiving portion.

A signal distributor 8 is provided on the other end side of the fourth signal cable 7, that is, on the image receiving side, and the signal distributor 8 converts the transmitted combined power supply signal into a frequency-converted first power supply signal. It is distributed to the second power supply signal which is not frequency-converted. Next, of the power supply signals distributed by the signal distributor 8, the frequency-converted first power supply signal is converted into the second power supply signal.
Since the frequency converter 11 is configured to convert the power supply signal in the received frequency band, the existing house 14 in which only one fourth signal cable is provided as a power supply line is provided.
The above broadcast receiving equipment can also be the broadcast receiving equipment that transmits the power supply signals of the same frequency band received by different antennas required for diversity from the outdoors to the indoors.

Therefore, to the power feed signal input of the diversity receiver 13, the second power feed signal which is not frequency converted and which is distributed by the signal distributor 8 and the frequency which is received by the second frequency converter 11 are frequency converted. The diversity receiver 13 can input the first feed signal and the diversity receiver 13 selects a good feed signal from the feed signals of the horizontal polarization or the vertical polarization from the cross Yagi antenna 1, or the same. The power supply signals in the frequency band can be combined and used. As a result, the diversity receiver 13
Makes it possible to compensate for good reception of broadcast waves, that is, deterioration of reception performance due to propagation fluctuations.

In the diversity receiver of the present embodiment, the first frequency converter 4 is configured to generate the reference signal used for frequency conversion from the feed signal, but the present invention is not limited to this. For example, as shown in FIG. 3, it is possible to simplify the configuration of the first frequency converter 4, which needs to be installed outdoors, by using a configuration in which a known oscillator element such as a crystal oscillator generates a local signal. Can be converted. However, FIG. 3A is a diagram for explaining the schematic configuration of the first frequency converter 4 of another embodiment, and FIG. 3B is the first embodiment of the other embodiment. It is a figure for demonstrating the schematic structure of the frequency converter 4.

In FIG. 3, 25 is a frequency-converted feed signal, 26 is an oscillating unit, 27 is a local signal, 28 is a reference signal, 29 is a combining unit, 30 is a distributing unit, 31 is an oscillating unit,
Reference numeral 32 represents a frequency converter.

The first frequency converter 4 shown in FIG.
Has an oscillating unit 26 that generates a local signal 27 by a well-known oscillator element such as a crystal oscillator, and the frequency converting unit 22 uses an input terminal based on the local signal 27 generated by the oscillating unit 26 itself. The power supply signal (e.g., the first power supply signal) input from is converted into the power supply signal 25 having a preset frequency.

At this time, the second frequency converter 11 on the receiving side can generate the local signal 27 by a well-known oscillator element such as a crystal oscillator, but the first and second frequency converters are used. Since the frequency deviation caused by the converters 4 and 11 becomes large, in another embodiment, the reference signal (reference signal 28) is transmitted from the first frequency converter 4 to the second frequency converter 11. It is configured to do. However, it goes without saying that the first and second frequency converters 4 and 11 may each be provided with an oscillating unit having the same oscillating frequency.

That is, the oscillator 26 uses the local signal 27.
Is generated and output, and the reference signal 28 is also generated. Here, in the present embodiment, the reference signal 28 generated by the oscillating unit 26 is output to the signal combiner 6 from the output terminal 23 after being combined by the combining unit 29 with the frequency-converted first feed signal. To be done. In addition, the synthesizing unit 29 is the signal synthesizing unit 6
It goes without saying that it may be formed integrally with

On the other hand, the second frequency converter 11 has the frequency-converted first power supply signal and the reference signal 2 synthesized by the synthesizer 29 from the power supply signal input from the input terminal 15.
And a distribution unit 30 that distributes The reference signal 28 distributed by the distributor 30 is input to the oscillator 31.
Further, the oscillator 31 is configured to generate the local signal 27 based on the reference signal. Here, the frequency conversion unit 32, based on the local signal 27, the distribution unit 30.
Since it is configured to convert the frequency-converted first power supply signal distributed in step 1 to the original frequency, it is possible to cancel the frequency deviation caused by the first and second frequency converters 4 and 11. Becomes Needless to say, the distributor 30 may be formed integrally with the signal distributor 8. Further, when the broadcast receiving equipment is only the fourth signal cable 7, it is possible to generate the reference signal 28 by the second frequency converter 11 on the indoor side and supply it to the first frequency converter 4. is there. However, in the case of broadcast receiving equipment capable of receiving broadcast waves in the VHF band, UHF band, satellite broadcasting band, etc., mixers, branching devices, amplifiers (boosters), etc. are arranged, and high frequency signals such as power supply signals are arranged. Is transmitted from the indoor side to the outdoor side, the reference signal 2 from the first frequency converter 4 side to the second frequency converter 11 side.
8 need to be transmitted.

Further, although the case where only the fourth signal cable 7 is used as the existing broadcast receiving equipment has been described in the present embodiment, for example, it is possible to receive the broadcast waves in the VHF band, the UHF band and the satellite broadcast band. It goes without saying that the present invention can be applied to the conventional broadcast receiving equipment. For example, an outdoor broadcast receiving facility including an antenna for receiving a broadcast wave in a VHF band, a UHF band, a satellite broadcast band, and the like, and a mixer for mixing a power supply signal of the broadcast wave received by each antenna,
Also, a branching device that is disposed between the mixer and the wall surface terminal and branches the mixed power feeding signal into two or more, and the respective power feeding signals that are branched by this branching device are divided into the VHF band, the UHF band,
It can also be applied to indoor broadcast receiving equipment, such as a distributor that distributes each power supply signal in a satellite broadcasting band or the like. In this case, for example, the frequency from the frequency converter 4 is set so as not to match the existing frequency, and the output from the signal synthesizer 6 is input to the existing mixer so that the mixer can output the terrestrial digital signal. A power supply signal in which the broadcast power supply signal is mixed is output. On the indoor side, the power supply signal taken out from the wall surface terminal is branched into two, one power supply signal is input to the signal distributor 8, and the other power supply signal is input to the existing distributor. With such a configuration, the signal distributor 8 outputs the second feed signal and the frequency-converted first signal.
Power supply signal is taken out and VHF is supplied from the existing distributor.
Power supply signals of broadcast waves in the band, UHF band, satellite broadcasting band, etc. are respectively taken out.

Further, the first frequency converter 4 and the second frequency converter of the present embodiment require a power source. For example, a conventional power source for supplying a radiator for receiving satellite broadcasting is required. , The signal distributor 8, the second frequency converter 11,
Alternatively, it can be realized by supplying DC power from the diversity receiver 13. Alternatively, at least the first frequency converter 4 may be powered from the power supplied to the radiator for receiving satellite broadcasting.

Further, in the present embodiment, the feed signals of the same frequency band obtained by the two antennas of the horizontally polarized wave antenna and the vertically polarized wave antenna are respectively transmitted by the existing fourth signal cable 7. Although the case has been described, it is needless to say that the feed signals in the same frequency band received by three or more antennas may be transmitted. However, in this case, the first and second frequency converters 4 and 11 corresponding to the number of antennas are provided, and the frequency of the power feeding signal received by each antenna is converted to a different frequency, and then the signal is converted. It is necessary to combine them by the combiner 6 and transmit them by the fourth signal cable 7 to restore the power supply signal of the original frequency on the indoor side.

Furthermore, in the present embodiment, reception of terrestrial digital broadcasting has been described, but the present invention is not limited to this, and it is also applicable to reception of other broadcast waves and communication radio waves. There is no end.

As described above, the invention made by the present inventor is
Although the specific description has been given based on the embodiment of the invention, the invention is not limited to the embodiment of the invention and can be variously modified without departing from the scope of the invention. .

[0057]

The effects obtained by the typical ones of the inventions disclosed in the present application will be briefly described as follows.

(1) Since the feed signals of the same frequency received by a plurality of antennas are frequency-converted and transmitted, and the original frequency is converted at the image receiving portion, only one signal cable is provided as a feed line. Even existing broadcast receiving facilities of existing homes can transmit power supply signals of the same frequency received by a plurality of different antennas required for diversity from the outdoors to the indoors.

(2) Since the feed signal of the same frequency, which is received by a plurality of different antennas required for diversity, can be transmitted from the outdoor to the indoor by the existing broadcast receiving equipment, the diversity technology can be easily introduced. You can

(3) Since the reception using the diversity technique can be easily performed by the existing broadcast receiving equipment, it is possible to supplement the good reception of the broadcast wave at a low cost, that is, the deterioration of the reception performance due to the propagation fluctuation. Become.

(4) The frequency deviation caused by the frequency conversion is canceled by the frequency conversion performed by the first and second frequency converters using the frequency reference signal extracted from the power supply signal of the terrestrial digital broadcasting. Is possible.

(5) An OFDM demodulator or the like for extracting a frequency reference signal from a power feeding signal of terrestrial digital broadcasting is not required by generating a signal used for frequency conversion by the first frequency converter arranged outdoors. Therefore, the configuration of the frequency converter can be simplified.

(6) By sending the reference signal from the first frequency converter arranged outdoors to the second frequency converter arranged indoors, it is possible to cancel the frequency deviation caused by the frequency conversion. Becomes

[Brief description of drawings]

FIG. 1 is a diagram for explaining a schematic configuration of a diversity receiving device according to an embodiment of the present invention.

FIG. 2 is a diagram for explaining a schematic configuration of a frequency conversion circuit according to the present embodiment.

FIG. 3 is a diagram for explaining a schematic configuration of a frequency converter according to another embodiment.

FIG. 4 is a diagram for explaining a schematic configuration of a frequency reference signal extracting unit according to the present embodiment.

[Explanation of symbols]

1 ... Cross Yagi antenna 2 ... 1st signal cable 3 ... 2nd signal cable 4 ... 1st frequency converter 5 ... 3rd signal cable 6 ... Signal synthesizer 7 ... 4th signal cable 8 ... Signal distribution Device 9 ... Fifth signal cable 10 ... Sixth signal cable 11 ... Second frequency converter 12 ... Seventh signal cable 13 ... Diversity receiver 14 ... House 15 ... Input terminal 16 ... Branching unit 17 ... First Branch signal 18 ... Frequency reference signal extraction section 19 ... Frequency reference signal 20 ... Oscillation section 21 ... Local signal 22 ... Frequency conversion section 23 ... Output terminal 24 ... Second branch signal 25 ... Frequency-converted feed signal 26 ... Oscillation Unit 27 ... Local signal 28 ... Reference signal 29 ... Synthesis unit 30 ... Distribution unit 31 ... Oscillation unit 32 ... Frequency conversion unit 401 ... Frequency converter 402 ... First oscillation circuit 403 ... IF circuit 4 4 ... Frequency converter 405 ... second oscillation circuit 406 ... A / D
Converter 407 ... Quadrature demodulator 408 ... FFT 409 ... Synchronous reproduction circuit 410 ... Frame extraction means 411 ... First extraction terminal 412 ... Second extraction terminal

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hiroyuki Hamazumi             1-10-11 Kinuta, Setagaya-ku, Tokyo, Japan             Broadcasting Association Broadcast Technology Institute (72) Inventor Shunji Nakahara             1-10-11 Kinuta, Setagaya-ku, Tokyo, Japan             Broadcasting Association Broadcast Technology Institute (72) Inventor Koichiro Imamura             1-10-11 Kinuta, Setagaya-ku, Tokyo, Japan             Broadcasting Association Broadcast Technology Institute (72) Inventor Yoshitaka Ando             1-10-11 Kinuta, Setagaya-ku, Tokyo, Japan             Broadcasting Association Broadcast Technology Institute (72) Inventor Kohei Kanbara             1-10-11 Kinuta, Setagaya-ku, Tokyo, Japan             Broadcasting Association Broadcast Technology Institute F-term (reference) 5C025 AA22 DA01                 5K059 CC03 DD37 EE01

Claims (4)

[Claims] 1. Two or more antennas for receiving broadcast waves in the same frequency band, and a frequency band different from the frequency band for receiving at least one power supply signal frequency band among the power supply signals supplied from the antennas. First conversion means for converting into a band, mixing means for mixing a power supply signal frequency-converted by the first conversion means and a power supply signal not frequency-converted from the antenna, and one end side is connected to the mixing means. A power supply line for transmitting a power supply signal output from the mixing means to an image receiving portion, a power supply signal arranged at the other end of the power supply line for the frequency-converted power supply signal and the frequency-unconverted power supply signal. And a second converter for converting the frequency-converted power-supply signal of the power-supply signals distributed by the distributor to the received power-supply signal in the frequency band. A broadcast receiving facility characterized by having a step. 2. The broadcast receiving equipment according to claim 1, wherein the first and / or the second converting means synchronizes with the means for extracting a frequency reference signal from the power supply signal and the frequency reference signal. A broadcast receiving facility comprising means for performing frequency conversion. 3. The broadcast receiving equipment according to claim 1, wherein the first converting means includes an oscillating means for generating a reference signal, and a means for performing frequency conversion in synchronization with the reference signal. Broadcast receiving equipment characterized by. 4. A plurality of antennas for receiving broadcast waves of the same frequency band, and a means for selecting a power feeding signal received by an antenna that can obtain a good power feeding signal from the power feeding signals fed from the antennas. And / or a receiving means having a receiving means having a means for synthesizing and using the feed signals received by the antenna, the frequency of at least one feed signal of the feed signals fed from the antenna being received. First conversion means for converting into a frequency different from the converted frequency band, mixing means for mixing the power-supply signal frequency-converted by the first conversion means and the power-supply signal not frequency-converted from the antenna, A power feed line for transmitting the mixed power feed signal to the image receiving point, and the frequency-converted power feed signal for the transmitted power feed signal and the frequency-converted power feed signal. And a second conversion means for converting the frequency-converted power-supply signal of the power-supply signals distributed by the distribution means into a received power-supply signal in the received frequency band. A diversity receiver characterized in that