JPH09168104A - Common reception facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent deterioration in image quality and sound quality and to reduce man-hours for installation work by sending a CSIF signal and a BSIF signal including vertically and horizontally polarized waves as an FM modulation wave through a coaxial cable. SOLUTION: A UHF down-converter 9 at a transmitter side shifts a transmission frequency band of a UHF TV broadcast downward as a narrow band width with a required number of channels depending on a transmission district. Furthermore, a CS down-converter 7 provides one CSIF signal of a polarized wave signal from a CS antenna. Then signals from the down-converters 7, 9 are inserted to a frequency band between a VHF signal channel and a BSIF signal band and the resulting signal is sent. Thus, the VHF, UHF and CS signals are sent through one coaxial cable. Then a receiver side receives the BS and CS signals through one coaxial cable as an FM modulation wave without deteriorating image quality and sound quality via CS and UHF up-converters 14, 15.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a joint reception facility,
Particularly, the present invention relates to a device capable of jointly receiving radio waves (CS) from a communication satellite together with ground waves and satellite broadcasting (BS).

[0002]

2. Description of the Related Art In a conventional joint reception facility, a CS intermediate frequency signal from an antenna for receiving a communication satellite and a BS intermediate frequency signal from an antenna for receiving a satellite broadcast are input to a head end device, and the head end device receives the CS intermediate frequency signal. The FM-modulated CS intermediate frequency signal and BS intermediate frequency signal are demodulated into a baseband signal, and VHF is generated using this baseband signal.
The carrier of the empty channel in the band and the UHF band is AM-modulated, mixed with the signals in the VHF band and the UHF band, and transmitted by the coaxial cable. However, the CS intermediate frequency signal and the BS intermediate frequency signal are converted to baseband signals, and A
Since the M-modulated wave is transmitted, there is a problem that the image quality and the sound quality are deteriorated as compared with the case where the FM-modulated wave is transmitted as it is.

In addition, in order to increase the number of transmission channels, a communication satellite uses vertical polarized waves and horizontal polarized waves to transmit radio waves. In the vertically polarized waves and horizontal polarized waves, a transmission frequency band for transmitting channels is used. Is an overlapping array,
It is necessary to rearrange channels in the headend device and perform AM modulation for transmission, or to transmit using a separate coaxial cable. If the headend device performs AM transmission, image quality and sound quality deteriorate, When using a plurality of coaxial cables, there is a problem that it takes time and effort for construction and the cost for constructing a shared reception facility becomes high.

Further, in the method in which the vertically polarized and horizontally polarized CS intermediate frequency signals are arranged side by side on the upper side of the BS intermediate frequency signal and transmitted, the transmission bandwidth is widened, and a coaxial cable transmits a signal in a high frequency band. Since the loss becomes large, an amplifier for compensating for this is required in the transmission line, which requires time and effort for construction and also raises the cost of constructing a shared reception facility.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and uses a single coaxial cable to provide a CS intermediate frequency signal including vertically polarized waves and horizontally polarized waves and a BS intermediate frequency signal. A joint reception facility that can transmit a frequency signal as an FM-modulated wave and prevent the signal transmission band from widening to prevent deterioration of image quality and sound quality, save time and effort for construction, and reduce costs. The purpose is to provide.

[0006]

The joint reception facility of the first invention of the present application is configured such that the transmitting side receives each antenna for receiving VHF and UHF and BS (broadcast satellite) for receiving B
A BS antenna for converting into an S intermediate frequency signal, a CS antenna for receiving one of CS (communication satellite) polarized signals and converting into a first CS intermediate frequency signal, and a CS (communication satellite) polarized signal A CS antenna that receives the other and converts it into a second CS intermediate frequency signal is provided, and the signals from each antenna are mixed and transmitted by one coaxial cable, and the signal transmitted at the receiving side is distributed. In a joint reception facility that enables viewing on multiple TVs, UHF down shifts the UHF television signal transmission band to the transmitting side to a narrower band that can transmit the required number of channels according to the region and shifts to lower frequencies. The converter and one of the polarized signals
3rd of which CS intermediate frequency signal is shifted to the lower frequency
And a CS down converter for outputting the CS intermediate frequency signal, and inserting the signals from the UHF down converter and the CS down converter between the VHF channel transmission band and the BS intermediate frequency signal transmission band to obtain a normal V
A VHF channel transmission band for transmitting an HF channel signal, a UHF channel transmission band for transmitting a signal from the UHF down converter arranged above the VHF channel transmission band, and this UHF channel transmission band A third C having a predetermined width for transmitting a signal from the CS down converter arranged on the upper side.
S intermediate frequency signal transmission band, and the BS having a predetermined width arranged above the third CS intermediate frequency signal transmission band
The intermediate frequency signal transmission band and the second CS intermediate frequency signal transmission band having a predetermined width arranged on the upper side of the BS intermediate frequency signal transmission band are used, and the signals are transmitted as an arrangement with a gap between the respective signal transmission bands. It is characterized by

The joint reception facility of the second invention of the present application is the above U
A mixer in which an HF down converter mixes an input signal from a UHF antenna and an oscillation signal from a voltage controlled oscillator, a variable voltage power supply device capable of setting an output voltage according to a region, and a variable voltage power supply device from this variable voltage power supply device. The voltage controlled oscillator for generating a signal having a frequency according to an input voltage.

In the joint reception facility of the third invention of the present application, a mixed signal of VHF and UHF channels, a BS intermediate frequency signal and a second CS intermediate signal are extracted from the transmission signal taken out by the receiving side through a distributor and a branching device. A frequency divider signal and a third CS intermediate frequency signal which are separated and output, and a second CS intermediate frequency signal and a third CS intermediate frequency signal are input, and polarization is performed by a polarization selection signal. When the other of the signals is selected, the second CS intermediate frequency signal is output as it is, and when one of the polarized signals is selected, the third CS intermediate frequency signal is frequency-converted to the original frequency and output. An up-converter, a BS intermediate frequency signal, a mixed signal of VHF and UHF channels, and a signal from the CS up-converter are input, a desired reception channel is selected and received, and the polarization It is made of a receiving device for outputting a selection signal.

The joint reception facility of the fourth invention of the present application is the above-mentioned C.
An S up converter inputs a second CS intermediate frequency signal and a third CS intermediate frequency signal, switches them in two directions and outputs, and a signal from the first selector switch and a mixer. From the first selector switch, the mixer for mixing the signal from the first selector switch with the oscillation signal from the voltage-controlled oscillator, and the signal generator to generate a signal of a predetermined frequency. A voltage controlled oscillator, which inputs a polarization selection signal from the receiving device to the first changeover switch and the second changeover switch, and when the other of the polarization signals is selected, the first changeover switch is selected. Via the second changeover switch and the second changeover switch
Of the CS intermediate frequency signal, and when one of the polarized signals is selected, the third CS intermediate frequency signal input via the first changeover switch is frequency-converted by the mixer to perform the second conversion. It is characterized in that it is output via the changeover switch of.

In the joint receiving facility of the fifth invention of the present application, the receiving side separates the VHF channel signal and the UHF channel signal from the mixed signal of the VHF and UHF channels and frequency-converts the UHF channel signal to perform U conversion.
A UHF up-converter having a frequency in the HF band is provided, and the VHF channel signal and the UHF channel signal converted into the UHF band frequency are input to the receiving device via the UHF up-converter.

The joint reception facility of the sixth invention of the present application is the above-mentioned U.
An HF up-converter extracts a VHF channel signal from a mixed signal of VHF and UHF channels, a low pass filter for extracting a UHF channel signal, an input signal from the band pass filter and an oscillation signal from a voltage controlled oscillator. A mixer for mixing, a variable voltage power supply device whose output voltage can be set according to the region, and the voltage controlled oscillator for generating a signal of a frequency according to the input voltage from the variable voltage power supply device, It is characterized in that the UHF channel signal is converted to a frequency in a band without UHF broadcasting by switching the voltage setting of the variable voltage power supply device.

[0012]

According to the first aspect of the present invention, a UHF down converter for shifting the transmission band of UHF television broadcasting to a lower frequency by setting the transmission band of the UHF television broadcast to a narrow band capable of transmitting the required number of channels according to the region, and the CS antenna. One of the first CS intermediate frequency signals (hereinafter, CS-I
A CS down converter that shifts an F1 signal) to a lower frequency and outputs a third CS intermediate frequency signal (hereinafter, referred to as a CS-IF2 signal) is provided, and a VHF signal band and a BS intermediate frequency signal ( Hereinafter, the UHF down converter and the C
The signal from the S down converter is inserted and transmitted. The frequency arrangement of the transmission signals is, in order from the lower frequency, a VHF channel transmission band for transmitting a normal TV VHF channel signal, a UHF channel transmission band for transmitting a signal from a UHF down converter, and a signal from a CS down converter. CS-IF2 signal transmission band having a predetermined width for transmitting a BS-IF having a predetermined width
A BS-IF signal transmission band for transmitting a signal and a second CS intermediate frequency signal (hereinafter, C
The CS-IF signal transmission band for transmitting (S-IF signal) is provided, and interference is prevented by arranging the signal transmission bands at intervals.

Therefore, using one coaxial cable, V
It becomes possible to transmit a CS intermediate frequency signal including both HF channel signal, UHF channel signal, and both polarization signals of CS and BS intermediate frequency signal, and a generally used VHF channel transmission band and CS intermediate frequency signal transmission band Since one of the polarization signals of CS can be inserted between and transmitted, it is necessary to prevent the signal transmission band from widening and
Since the CS intermediate frequency signal and the BS intermediate frequency signal can be transmitted as the FM modulated wave, it is possible to prevent the image quality and the sound quality from deteriorating and to reduce the number of construction steps.

In a second aspect of the present invention, in the first aspect of the present invention, the UHF down converter mixes the input signal from the UHF antenna with the oscillation signal from the voltage controlled oscillator, and the output voltage according to the region. And a voltage controlled oscillator that generates a signal of a frequency according to an input voltage from the variable voltage power supply device.
From CH (470 MHz) to 62 CH (770 MHz), there is no area that uses all of this band for broadcasting, and there is at most about 6 CH, and the output of the variable voltage power supply device depends on the broadcasting situation in the area. By setting the voltage, the frequency is shifted to a lower frequency, and the transmission bandwidth is narrowed to, for example, about 210 MHz for transmission. Therefore, it is possible to transmit the CS-IF2 signal, which is one of the polarization signals, as the FM signal as it is between the shifted frequency band and the BS-IF signal band.

According to the third and fourth inventions of the present application, in the first invention of the present application, a mixed signal of VHF and UHF channels is divided by a demultiplexer from a transmission signal taken out through a distributor and a brancher at the receiving side. And BS-IF signal and CS-
IF2 signal and CS-IF signal are separated and V
The mixed signal of the HF and UHF channels and the BS-IF signal are directly input. If the VHF channel signal (90 to 220 MHz) is provided with a guard band of about 10 MHz and the signal from the UHF down converter is transmitted, the signal from the UHF down converter will be 2
It will be possible to transmit from 30MHz to 440MHz,
VHF and UH can be used as long as the receiving device is capable of receiving CATV signals (up to 440 MHz) of 12CH or more.
It becomes possible to directly select and receive a desired channel from the mixed signal of the F channel, and the BS-IF signal is generally used from 1022 MHz to 1322 M.
Since the signal is transmitted at Hz, any receiving device having a normal BS tuner can receive the signal.

CS-IF signal and CS separated by the demultiplexer
-IF2 signal is input to CS up converter,
As a CS up converter, a CS-IF signal and a CS
A first changeover switch for inputting and outputting the IF2 signal in two directions, and a second changeover switch for changing over and outputting the signal from the first changeover switch and the signal from the mixer, It comprises a mixer for mixing the signal from the first changeover switch and the oscillation signal from the voltage controlled oscillator, and a voltage controlled oscillator for generating a signal of a predetermined frequency. Input to the first changeover switch and the second changeover switch, and when the other of the polarization signals is selected, the CS-IF signal is output via the first changeover switch and the second changeover switch, and When one of the wave signals is selected, the CS-IF2 signal input via the first changeover switch is frequency-converted by the mixer and returned to the frequency before being shifted, and then the second changeover switch is used. To output And it is, it is possible to receive a CS broadcast by a signal input from the CS-up converter if the receiving apparatus having a CS tuner.

According to the fifth and sixth inventions of the present application, in the third and fourth inventions of the present application, VHF and UH are provided on the receiving side.
From the mixed signal of F channel to VHF channel signal and U
U that separates the HF channel signal and frequency-converts the UHF channel signal to a UHF band frequency U
An HF up-converter is provided so that the VHF channel signal and the UHF channel signal converted into the frequency in the UHF band are input to the receiving device via the UHF up-converter. Furthermore, as a UHF up-converter, a low pass filter for extracting a VHF channel signal from a mixed signal of VHF and UHF channels, a band pass filter for extracting a UHF channel signal, an input signal from this band pass filter and a voltage controlled oscillator are used. Mixer that mixes with the oscillation signal of, a variable voltage power supply device that can set the output voltage according to the region,
It is configured with a voltage controlled oscillator that generates a signal having a frequency according to the input voltage from the variable voltage power supply device.

For example, the output voltage of the variable voltage power supply device is set according to the region, and U is broadcast in the region by the mixer.
By converting to a frequency different from the HF frequency band so as not to be disturbed by broadcast waves, a general receiving apparatus has a function of adjusting the reception frequency.
It becomes possible to receive the UHF broadcast by operating the adjustment function and tuning the signal input from the HF up-converter. It should be noted that the VHF channel signal remains at the generally used frequency and can be received by an ordinary receiving device.

[0019]

1 is a block diagram showing an embodiment of a joint reception facility of the present invention. First, the transmitting side will be described.
In the CS receiving antenna 1, for example, a horizontally polarized signal of CS is received, converted into a 1 GHz band CS-IF1 signal and input to the CS down converter 7, and the CS down converter 7 frequency-converts it into a low frequency band CS-IF2. The signal is shifted and input to the mixer 8. The CS receiving antenna 2 receives, for example, a vertically polarized signal of CS, and receives C of 1 GHz band.
The signal is converted into an S-IF signal and input to the mixer 8. The BS reception antenna 3 receives the BS signal and the BS-band of 1 GHz band is received.
Convert to IF signal and input to mixer 8
The F antenna 4 receives the VHF band TV signal and inputs it to the mixer 8. The UHF antenna 5 receives the UHF band TV signal (f1) and receives the UHF down converter 9
To the mixer 8, and the UHF down converter 9 frequency-converts the UHF TV signal (f2) shifted to a low frequency. The mixer 8 mixes the input signals and outputs the mixed signal to the coaxial cable 10 used as a trunk cable for transmission to the receiving side.

FIG. 2 is a block diagram showing an embodiment of the UHF down converter of FIG. The RF amplifier 20 amplifies the UHF signal and the frequency (f1) input from the UHF antenna 5 and inputs the amplified frequency to the mixer 21, and the mixer 21 mixes the oscillation signal from the voltage controlled oscillator (VCO) 22 with the frequency fL1. Then, it is converted into a low frequency f2 (= f1−fL1), amplified by the IF amplifier 24, and input to the mixer 8. The variable voltage power supply device 23 is provided with a voltage setting unit 25,
By changing the setting of the voltage setting unit 25, the output voltage can be set in multiple stages of Va to Vc according to the region, and the voltage controlled oscillator 22 generates according to the voltage input from the variable voltage power supply device 23. The frequency of the signal to be changed is changed from fL1a to fL1c, and accordingly, the output of the IF amplifier 24 can also be changed in frequency.

The frequency of the voltage controlled oscillator 22 is set to, for example, 22.
The frequency of the voltage controlled oscillator 22 is set to 220 MHz when the UHF broadcasting channel used in the area is 13 CH to 32 CH, and 33 MHz to 33 CH to 5 MHz.
In case of 2CH, the frequency of the voltage controlled oscillator 22 is 280M.
The frequency of the voltage controlled oscillator 22 is 330 MHz when the frequency is 53 CH to 62 CH. By doing this, the signals of 13CH to 32CH are changed from 250MHz to 37CH.
Can convert to 0MHz band signal, 33CH
The signals of -52CH can be converted into signals in the band of 310MHz to 430MHz, and the signals of 53CH-62CH can be converted into signals in the band of 380MHz to 440MHz.

UHF TV channel is 13CH (47
0MHz) to 62CH (770MHz),
There is no area that uses all of this band for broadcasting, and it is about 6CH at most. By setting the output voltage of the variable voltage power supply device 23 according to the broadcasting situation in the area,
It is possible to shift the frequency to a low frequency and narrow the transmission bandwidth to, for example, about 210 MHz for transmission. For example, when there is a broadcast from 47CH to 62CH in a certain area, the frequency of the voltage controlled oscillator 22 is set to 330M.
Hz, and the signals of 47CH to 62CH are converted to signals in the band of 440MHz to 440MHz, and about 210MH
The transmission bandwidth is z.

FIG. 3 is a block diagram showing an embodiment of the CS down converter of FIG. C in the RF amplifier 30
The CS-IF1 signal input from the S reception antenna 1, for example, the signal of the frequency (f3) of 1377 to 1877 MHz is amplified and input to the mixer 31, and the voltage controlled oscillator (VC
O) 32 oscillates at a frequency (fL3) of about 927 MHz and inputs the oscillation signal to the mixer 31, and the mixer 31 converts the frequency of f3 and the frequency f4 of (f3-fL3).
And the CS-I in the frequency band of 450 to 950 MHz.
The F2 signal is converted and output, amplified by the IF amplifier 33, and input to the mixer 8.

FIG. 6 is an explanatory diagram showing an example of arrangement of transmission bands of respective signals according to the present invention. TV signals in the VHF band are transmitted in the usual arrangement between 90 and 220 MHz,
BS-IF signals are generally used 1022-1
The signal is transmitted at 322 MHz, and the CS-IF signal is similarly transmitted at 1377 to 1877 MHz which is generally used. The UHF down converter 9 converts the frequency into a narrow bandwidth capable of transmitting the required number of channels and shifts the frequency to a low frequency band. The UHF band has about 6 channels even in a region where many broadcasts are performed. ,
A bandwidth of at least 36MHz is required for transmission on this channel, but 230-440MHz is required with a margin in mind.
Between the TV signal in the VHF band and 1
A guard band of 0 MHz vacant frequency band is provided to prevent interference.

Therefore, the frequency band vacated by shifting and B
One of the linearly polarized signals from the CS antenna, the CS-IF2 signal, which is one of the linearly polarized signals, can be transmitted as the FM signal during the S-IF signal band, and the CS down converter 7 frequency-converts the CS-IF2 signal. The signal shifted to the IF2 signal secures a predetermined band of 500 MHz and is 450 to 950.
UHF signal and BS-
A guard band is provided for each IF signal and arranged so as not to interfere with each other. Therefore, with one coaxial cable, B
The FM modulated wave can be transmitted as it is as the S and CS signals, so that it is possible to prevent the deterioration of the image quality and the sound quality and reduce the man-hours for the construction work.

Next, the receiving side will be described. As shown in FIG. 1, a distributor 11 is connected to one end of a coaxial cable 10, and a signal transmitted from the distributor 11 is distributed and transmitted through each branch line. The transmission signals are respectively branched from the series unit (branching device) 12 so that the transmission signals can be taken out. In the demultiplexer 13, the mixed signals of the VHF and UHF channels and the BS are transmitted from the transmission signals input via the series unit 12. -IF signal and CS
-IF signal and CS-IF2 signal are separated, mixed signal of VHF and UHF channels is input to UHF up-converter 15, and BS-IF signal is CS / BS tuner 1
6 and input CS-IF signal and CS-IF2 signal to CS
It is input to the up converter 14.

FIG. 4 is a block diagram showing an embodiment of the UHF up-converter shown in FIG. A mixed signal of VHF and UHF channels separated by the demultiplexer 13 is input to the IF amplifier 40, which is amplified and branched by the IF amplifier 40 and input to a low-pass filter (LPF) 41 that allows one to pass up to 220 MHz. The low pass filter 41 extracts the VHF channel signal and inputs it to the TV 17 of FIG. 1 so that the VHF television signal can be received. Further, the other amplified and branched by the IF amplifier 40 is inputted to a bandpass filter (BPF) 42, and as the bandpass filter 42, one having a pass band of 230 MHz to 440 MHz is used and shifted to a low frequency. The UHF channel signal of frequency f2 is extracted.

In the mixer 43, the input signal from the bandpass filter 42 and the frequency fL2 from the voltage controlled oscillator 45 are input.
Frequency signal f1 of (f2 + fL2)
a into the RF amplifier 44 and input to the RF amplifier 44.
Amplify and output. The variable voltage power supply device 46 is provided with a voltage setting unit 47, and the setting of the voltage setting unit 47 is switched so that the output voltage can be set in a plurality of stages of Vd to Vf according to the region. The voltage-controlled oscillator 45 changes the frequency of the generated signal from fL2d to fL2f in accordance with the voltage input from, and the frequency of the output from the RF amplifier 44 can be changed accordingly.

The frequency of the voltage controlled oscillator 45 is, for example, 220 MHz, 280 MHz and 330 MH as in the transmitting side.
It is possible to switch to three stages of z, for example 47CH
When used in an area where UHF broadcasting channels from (674 MHz) to 62 CH (770 MHz) are used, the frequency of the voltage controlled oscillator 45 is 220 MHz.
Signal from 47CH to 62CH at 564MHz
To 660 MHz. in this way,
The output voltage of the variable voltage power supply device 46 is set according to the region, and the mixer 43 converts it to a frequency different from the frequency band in which the broadcasting is performed in the region so as not to be interfered with the broadcast wave. Since a general receiving device has a function of adjusting the reception frequency, the UHF up-converter can be adjusted by operating this adjustment function to perform tuning.
47CH converted from 64MHz to 660MHz
It is possible to receive UHF signals from to CH 62. The VHF channel signal remains at the generally used frequency and can be received by a normal receiving device.

In the embodiment of FIG. 1, the mixed signals of the VHF and UHF channels separated by the demultiplexer 13 are converted into UHF signals.
Although it is input to the TV 17 through the up converter 15, the UHF channel signal is 230MHz to 440M.
Since the TV 17 is capable of receiving CATV signals of up to 12 channels (up to 440 MHz), the demultiplexer 13 is used.
Mixed signal of VHF and UHF channels from TV1
It is also possible to input directly to 7.

FIG. 5 is a block diagram showing an embodiment of the CS up converter of FIG. In the RF amplifier 50, the CS-IF signal and the CS-IF input from the demultiplexer 13 are input.
The two signals are amplified and input to the switch 51, one of the output sides of the switch 51 is connected to one of the input sides of the switch 52, and CS
/ BS tuner 16 is operated and vertical polarization is selected, the switch 51 and the switch 52 are switched to the upper side by the control signal output from the CS / BS tuner 16, and the CS-IF signal is output from the switch 52. Is output as it is and is input to the CS / BS tuner 16 so that the vertically polarized channel can be received.

When horizontal polarization is selected by operating the CS / BS tuner 16, the switch 51 and the switch 52 are switched to the lower side by the control signal output from the CS / BS tuner 16, and the RF amplifier is switched. Signal from 50 is switched 5
1 to the mixer 53. Voltage controlled oscillator 54
Oscillates at a frequency (fL3) of about 927 MHz and inputs the oscillation signal to the mixer 53.
The CS-IF2 signal in the frequency band (f4) of 950 MHz is converted into the frequency f3 of (f4 + fL3) and output.
The F-amplifier 55 amplifies and outputs it via the switch 52. Therefore, the original 1377 to 1877 MH is used.
CS / BS as a CS-IF signal in the frequency band up to z
It can be input to the tuner 16 and can receive a horizontally polarized channel. In addition, CS / BS tuner 1
Reference numeral 6 denotes the TV 1 by performing FM detection from the input BS-IF signal or CS-IF signal to demodulate a video signal and an audio signal.
7 is input so that BS or CS broadcasting can be received.

In the embodiment shown in FIG. 1, the CS down converter 7 may shift the vertically polarized signal of CS downward. In this case, the CS up converter 14 is used.
Then, the frequency signal of the vertically polarized channel signal may be frequency-converted to restore the original frequency. When a circularly polarized wave is used for CS, for example, the right circularly polarized wave of the circularly polarized wave is received by the CS receiving antenna 1 and converted into a 1 GHz band CS-IF1 signal, and the left circularly polarized wave is received by the CS. Received by antenna 2 and 1
It may be possible to convert the signal into a CS-IF signal in the GHz band and process the signal in the same manner as linearly polarized wave so that the signals can be jointly received.

In the above embodiment, the UHF channel signal is shifted to the lower frequency band 230-440 MHz,
One CS-IF2 of the linearly polarized signal from the CS antenna
The signal is transmitted in the 450 to 950 MHz band as it is as an FM signal, but the division of the frequency band is an example.
The transmission band of the HF channel signal is narrowed and shifted to the lower frequency band, and the shifted frequency band and BS-
If one of the linearly polarized CS-IF2 signals from the CS antenna can be transmitted as the FM signal during the IF signal band, the divided value of the frequency band may be changed and used. In addition, the oscillation frequency of the voltage controlled oscillator 22 is set to 2
The number of switching stages and the frequency are merely examples, and the number of switching stages may be increased or decreased or the value of the oscillation frequency may be changed.

[0035]

As described above, according to the present invention,
The transmission band of UHF television broadcasting is set to a narrow band capable of transmitting the required number of channels according to the region, shifted to the lower frequency, and the CS antenna is provided between the shifted vacant frequency band and the BS intermediate frequency signal band. One of the linearly polarized signals shifted to the lower frequency can be transmitted as an FM signal as it is. Therefore, a single intermediate cable is used for the CS intermediate frequency signal including the vertically polarized wave and the horizontally polarized wave. In addition, since the BS intermediate frequency signal can be transmitted as an FM modulated wave, it is possible to provide a joint reception facility capable of preventing deterioration in image quality and sound quality and reducing the number of construction steps.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a joint reception facility of the present invention.

FIG. 2 is a block diagram showing an embodiment of the UHF down converter of FIG.

3 is a block diagram showing an embodiment of the CS down converter of FIG. 1. FIG.

FIG. 4 is a block diagram showing an embodiment of the UHF up converter of FIG.

5 is a block diagram showing an embodiment of the CS up converter of FIG. 1. FIG.

FIG. 6 is an explanatory diagram showing an example of arrangement of transmission bands of respective signals according to the present invention.

[Explanation of symbols]

 1 CS receiving antenna 2 CS receiving antenna 3 BS receiving antenna 4 VHF antenna 5 UHF antenna 7 CS down converter 8 mixer 9 UHF down converter 10 coaxial cable 11 distributor 12 series unit 13 duplexer 14 CS up converter 15 UHF up converter 16 CS / BS tuner 17 TV 20 RF amplifier 21 Mixer 22 Voltage controlled oscillator 23 Variable voltage power supply device 24 IF amplifier 25 Voltage setting unit 30 RF amplifier 31 Mixer 32 Voltage controlled oscillator 33 IF amplifier 40 IF amplifier 41 Low pass filter 42 Bandpass Filter 43 Mixer 44 RF Amplifier 45 Voltage Controlled Oscillator 46 Variable Voltage Power Supply 47 Voltage Setting Section 50 RF Amplifier 51 Switcher 52 Switcher 53 Mixer 54 Voltage Controlled Oscillator 5 RF amplifier

Claims (6)

[Claims] 1. An antenna for receiving VHF and UHF at a transmitting side, a BS antenna for receiving BS (broadcast satellite) and converting it into a BS intermediate frequency signal, and a CS
A CS antenna that receives one of the polarized signals of (communication satellite) and converts it into a first CS intermediate frequency signal, and a second CS intermediate frequency signal that receives the other of the polarized signals of CS (communication satellite) A CS antenna that converts the signals to each other is provided, and the signals from each antenna are mixed and transmitted by one coaxial cable, and the signals transmitted at the receiving side are distributed so that they can be viewed on multiple TVs. U at the receiving facility
A UHF down converter that shifts the transmission band of the HF television signal to a lower frequency by setting a narrow bandwidth in which the required number of channels can be transmitted according to the region; And a CS down converter that outputs a third CS intermediate frequency signal shifted to the frequency of the above, and a signal from the UHF down converter and the CS down converter between the VHF channel transmission band and the BS intermediate frequency signal transmission band. Insert
A VHF channel transmission band for transmitting a normal VHF channel signal, a UHF channel transmission band for transmitting a signal from the UHF down converter arranged above the VHF channel transmission band, and this UH
The C arranged above the F channel transmission band
A third CS intermediate frequency signal transmission band having a predetermined width for transmitting a signal from the S down converter, and the BS intermediate frequency signal having a predetermined width arranged above the third CS intermediate frequency signal transmission band The transmission band and the second band of a predetermined width arranged above the BS intermediate frequency signal transmission band.
The common reception facility is characterized in that the CS intermediate frequency signal transmission band of the above is used, and the signals are transmitted as an arrangement with a space between each signal transmission band. 2. A mixer in which the UHF down converter mixes an input signal from a UHF antenna and an oscillation signal from a voltage controlled oscillator, a variable voltage power supply device capable of setting an output voltage according to a region, and The shared reception facility according to claim 1, further comprising: the voltage-controlled oscillator that generates a signal having a frequency according to an input voltage from the variable voltage power supply device. 3. The mixed signal of the VHF and UHF channels, the BS intermediate frequency signal, the second CS intermediate frequency signal, and the third CS intermediate frequency from the transmission signal taken out by the receiving side through the distributor and the splitter. A demultiplexer that separates and outputs a signal and a second CS intermediate frequency signal and a third CS intermediate frequency signal are input, and when the other of the polarization signals is selected by the polarization selection signal, The CS intermediate frequency signal of 2 is output as it is, and when one of the polarized signals is selected, the third CS intermediate frequency signal is frequency-converted to the original frequency and output, and the BS intermediate frequency signal V
2. A receiver for inputting a mixed signal of HF and UHF channels and a signal from the CS up-converter, selecting and receiving a desired receiving channel, and outputting the polarization selection signal. Joint reception facility. 4. The CS upconverter is a second CS.
2 by inputting the intermediate frequency signal and the third CS intermediate frequency signal
A first selector switch for switching and outputting in the direction, a second selector switch for switching and outputting a signal from the first selector switch and a signal from the mixer, and a signal from the first selector switch. And a voltage control oscillator for generating a signal of a predetermined frequency, and a mixer for mixing the oscillation signal from the voltage control oscillator and the voltage control oscillator for generating a signal of a predetermined frequency. When the other of the polarization signals is selected by inputting to the second changeover switch, a second CS intermediate frequency signal is output via the first changeover switch and the second changeover switch, When one of the wave signals is selected, the third CS intermediate frequency signal input via the first changeover switch is frequency-converted by the mixer and output via the second changeover switch. Common receiving facility according to claim 3, wherein symptoms. 5. The receiving side is provided with a UHF up-converter for separating the VHF channel signal and the UHF channel signal from the mixed signal of the VHF and UHF channels and for converting the frequency of the UHF channel signal into a frequency in the UHF band. 4. The joint reception facility according to claim 3, wherein the VHF channel signal and the UHF channel signal converted into a UHF band frequency are input to the receiving device via the UHF up converter. 6. A low-pass filter for extracting a VHF channel signal from a mixed signal of VHF and UHF channels, a band-pass filter for extracting a UHF channel signal, an input signal from the band-pass filter, and voltage control by the UHF up-converter. A mixer that mixes an oscillation signal from an oscillator, a variable voltage power supply device whose output voltage can be set according to the region, and the voltage that generates a signal having a frequency according to the input voltage from the variable voltage power supply device. And a UHF channel signal by switching the voltage setting of the variable voltage power supply device.
The shared reception facility according to claim 5, wherein the frequency is converted to a frequency in a band without F broadcasting.