JPH0320169B2 - - Google Patents

Description

[Detailed Description of the Invention] This invention is used in a communal reception system for Tervi V.UHF signals in a building to enable reception of satellite broadcasts in the rooms of subscribers who also wish to receive satellite broadcasts. The present invention relates to subscriber equipment that can be used.

Conventionally, in order to jointly receive TV V.UHF signals in a reinforced concrete building,
As shown in FIG. 4, antennas 8 and 9 for receiving TV VHF signals and TV UHF signals are installed on the roof of the building 50, respectively, while antennas 8 and 9 for receiving TV VHF signals and TV UHF signals are installed in each subscriber's room. A television receiver 31' is provided for this purpose. And between them,
Piping 53 embedded in the ceiling 51 and wall 52 of the building 50
A coaxial cable is inserted through the antennas 8 and 9, and the TV V.UHF signals from the antennas 8 and 9 are distributed to the TV receivers 31' in each room through the coaxial cable.

Recently, however, some subscribers have expressed a desire to receive satellite broadcasting. In this case, for example, building 5
An antenna and BS converter for satellite broadcast reception will be installed on the roof of 0 and placed in the rooms of the subscribers who wish to receive the above.
Install a BS tuner. Since the signal output from the above BS converter is an intermediate frequency signal in the 1 GHz band, the connection between the above BS converter and BS tuner is made by laying a separate circuit from the coaxial cable for the above TV V.UHF signal. Do it in a separate circuit. However, in that case, since the building is made of concrete, it is extremely difficult to install the separate circuit, and moreover, it requires exposed wiring, which is extremely unsightly.

Therefore, the present invention is provided to solve the above problem, and as shown in FIG. 4, the TV V.UHF signal is transmitted to the TV V.
By interposing a mixer 14 in the coaxial cable for UHF signals and connecting the antenna 1 and first frequency converter 5 for receiving satellite broadcasts to the mixer 14, subscribers who wish to receive satellite broadcasts can By simply connecting the subscriber device C of the present invention in front of the AV television 31 in the room of the subscriber, there is no need to install a separate circuit as described above, and in addition, in the rooms of other subscribers, the subscriber device C of the present invention can be connected in front of the AV television 31. It is an object of the present invention to provide a subscriber device which allows only the desired persons to receive the above satellite broadcasting without any adverse effect on the reception of V.UHF signals.

That is, as shown in FIGS. 1 and 4, the present invention includes a VHF antenna 8, a UHF antenna 9, a parabolic antenna 1, and a mixer 14. An antenna 9 is connected to the converter 2 which outputs a first intermediate frequency signal in the parabolic antenna, and a first intermediate frequency signal which converts the output signal from the converter 2 into a second intermediate frequency signal having a lower frequency. In the community reception system connected via the frequency converter 5, the subscriber equipment used connected to the output side 17 of the mixer 14 has a signal input terminal 35 connected to the output terminal 17 of the mixer 14. ', a TV V.UHF signal output terminal 33' connected to the signal input terminal 35' via a branching filter 26, and a video signal output terminal for outputting the video signal of the satellite broadcast signal to the AV TV. 32a′ and
It has an audio signal output terminal 32b' for outputting the audio signal of the satellite broadcast signal to the AV television, and between the branching filter 26 and the video signal output terminal 32a' and the audio signal output terminal 32b'. , a BS tuner 28 having an input terminal 29 for receiving an intermediate frequency signal in the 1 GHz band which is the first intermediate frequency signal, a video output terminal 30a and an audio output terminal 30b;
A series circuit with a second frequency converter 27 connected to the input terminal 29 of the second frequency converter 27 for converting the second intermediate frequency signal into a 1 GHz band intermediate wave signal is connected to the input terminal 29 of the second frequency converter 27. 24 is connected to the output side of the duplexer 26, and the video output terminal 30a and the audio output terminal 30b of the BS tuner 28 are connected to the video signal output terminal 32a' and the audio signal output terminal 32b', respectively. There is.

For example, in the Nagoya area, the second intermediate frequency signal is transmitted on channels 25 (542 to 548 MHz) and channels 35 (602 to 548 MHz) in the TV UHF broadcasting band.
608MHz) is already used for UHF broadcasting, so other vacant channels such as
This is a satellite broadcasting signal that has been converted to a frequency of 665.5 to 769.22MHz. In the following description, this second intermediate frequency signal will also be referred to as a satellite broadcast intermediate frequency signal or simply as an intermediate frequency signal.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

Figure 1 shows the system diagram of the satellite broadcasting receiving system, and A shows the broadcasting satellite (Yuri-2A) stationary at a height of approximately 36,000 km above the equator at 110 degrees east longitude. As is well known from broadcasting satellite A, 11.90578
~12.00950GHz (referred to as 12GHz band in this specification)
is transmitting radio waves. B indicates a satellite broadcast mixing device, which is used to mix satellite broadcasts into a TV VHF and UHF joint reception system using existing or conventional band equipment. To explain the satellite broadcasting mixing device B in detail, 1 is a parabolic antenna (offset parabolic antenna) for receiving radio waves in the 12 GHz band sent from the broadcasting satellite A. 2 is a BS converter,
12GHz radio waves received by parabolic antenna 1
It is for converting into a signal of a first intermediate frequency of 1.22778 to 1.33150 GHz (referred to as 1 GHz band in this specification). This frequency is based on the one determined by the Radio Technology Association. 3
is the primary radiator on the input side of BS converter 2. 4 is the output terminal of BS converter 2,
It is a terminal that outputs the first intermediate frequency signal in the 1 GHz band and also inputs a DC power supply (+15V) for operating the BS converter 2. 5
is the first frequency converter, which converts the output signal (1.22778~1.33150GHz) of BS converter 2 into TV UHF.
Band assigned to broadcasting (470-770MHz)
An empty band in the middle, e.g. 665.5~769.22MHz
(herein referred to as a second intermediate frequency signal). 6 is the input terminal of the first frequency converter 5, which is the input terminal of the BS converter 2
In addition to inputting the output of BS converter 2
This is also the terminal that outputs the DC power supply (+15V) to operate the. Reference numeral 7 denotes an output terminal of the first frequency converter 5, which outputs the second intermediate frequency signal. The configuration of the first frequency converter 5 is shown in FIG. Components corresponding to those in FIG. 1 are designated with the same reference numerals. 37 is AC plug, power supply AC 100V
is added. 38 is a high pass filter that passes signals in the 1GHz band and blocks direct current. 39 is a low-pass filter that passes direct current and blocks signals in the 1GHz band. 40 is the power supply circuit, from AC 100V to DC 15V
Create. 41 is a power separation filter. 42 is a frequency conversion circuit. 43 is a power supply terminal. Next, 14 is a mixer, which mixes the output signal of the first frequency converter 5 and the output signal of an amplifier 10, which will be described later. Its circuit configuration includes, for example, a high-pass filter that passes a second intermediate frequency signal of 665.5 MHz or higher, and a television VHF and UHF signal (for example,
A combination with a low-pass filter that passes signals with frequencies below 638 MHz is used. Reference numeral 15 denotes a first input terminal of the mixer 14, which is a terminal into which the signal output from the first frequency converter 5 is input. Reference numeral 16 denotes a second input terminal of the mixer 14, which is a terminal into which the signal output from the amplifier 10 is input. Reference numeral 17 denotes an output terminal of the mixer 14, which outputs the mixed television VHF and UHF signals and the second intermediate frequency signal. 34 indicates a coaxial cable.

The above is the configuration of the satellite broadcast mixing device B.

Next, 8 is a VHF antenna, which is used to receive TV radio waves of 90 to 222MHz sent from VHF broadcasting stations. 9 is a UHF antenna, for example, 470-638MHz transmitted from a UHF broadcasting station.
This is for receiving TV radio waves. 10
is an amplifier that amplifies the signals received by the VHF antenna 8 and the UHF antenna 9. 11
is the VHF input terminal of the amplifier 10. 12 is a UHF input terminal of the amplifier 10. 13 is a terminal in the amplifier 10 that outputs a mixture of UHF and VHF. 36 is a distributor, TV VHF and UHF
It distributes band signals (90-770MHz). 35 is a splitter, also called a series unit, which handles television VHF and UHF band signals (90~
770MHz) and supplies it to subscribers. 34 indicates a coaxial cable that connects each device.

As the VHF antenna 8, UHF antenna 9, amplifier 10, distributor 36, and branch 35 described above, it is possible to use existing equipment for the television VHF and UHF joint reception system.

Next, C indicates a subscriber device connected to the output terminal of the branching device 35. To explain the subscriber equipment C in detail, 26 is a branching filter that connects the TV from the branching device 35.
VHF and UHF band signals (90-770MHz),
It separates and outputs television VHF and UHF signals (signals of 638 MHz or less in this example) and a second intermediate frequency signal of satellite broadcasting. The circuit configuration is the same as that of the mixer 14 with the input and output reversed. 21 is an input terminal of a duplexer 26, to which the TV VHF and UHF band signals are added. 2
2 is a first output terminal, from which the second intermediate frequency signal of the satellite broadcasting is output. 23 is a second output terminal, from which the aforementioned television VHF and UHF signals are output. 27 is the second frequency converter, TV UHF
The second intermediate frequency signal of satellite broadcasting within the band
This converts the signal into a first intermediate frequency signal in the 1 GHz band. 24 indicates an input terminal of the second frequency converter 27. 25 indicates an output terminal of the second frequency converter 27. A first intermediate frequency signal in the 1 GHz band is output from the output terminal 25, and a DC power supply (+15V) for operating the second frequency converter 27 is applied to the output terminal 25 from a BS tuner 28, which will be described later. . The configuration of the second frequency converter 27 is shown in FIG. Components corresponding to those in FIG. 1 are designated with the same reference numerals. 44 is a high pass filter that passes signals in the 1GHz band and blocks direct current. 45 is a low-pass filter that passes direct current and blocks signals in the 1GHz band. 46 is a power separation filter. 47 is a frequency conversion circuit. 48 indicates a power supply end. Next, 28 is a BS tuner that selects a desired satellite broadcast channel signal from among the 1 GHz band signals sent from the second frequency converter 27, demodulates the selected signal, and generates a video signal. Return to audio signal (baseband signal). The video signal and audio signal are sent to the subsequent stage from the output terminal. The power supply (+15V) for operating the equipment in the previous stage is also sent from the input terminal. 29 is the input terminal of the BS tuner 28,
30a is the video output terminal of the BS tuner 28, 3
0b each indicates an audio output terminal. 31 is AV
Showing TV. 32a represents a video input terminal of the AV television 31, and 32b represents an audio input terminal.
33 is a television signal input terminal of the AV television 31. Reference numeral 37 indicates an AC plug for receiving power supply voltage AC100V for operating each device.

Regarding the satellite broadcasting signal system with the above configuration,
Let's explain its operation. of the first frequency converter 2
AC 100V is applied to the AC plug 37, and the power supply circuit 40 is activated to operate the frequency conversion circuit 42, and an operating voltage is sent to the BS converter 2, so that the BS converter 2 also operates.
On the other hand, AC 100V is also applied to the AC plug 37 of the BS tuner 28, and while the BS tuner 28 itself operates, the operating voltage is sent to the second frequency converter 27, and passes through the low-pass filter 45 to the power supply terminal. 48, a frequency conversion circuit 47 also operates.

() Satellite broadcasting Radio waves of 11.90578~12.00950CHZ are being transmitted from broadcasting satellite A, received by parabolic antenna 1, and 1.22778~1.33150GHz by BS converter 2.
Convert to intermediate frequency for satellite broadcasting. Furthermore, the first frequency converter 5 converts the satellite broadcast intermediate frequency signal (1.22778 to 1.33150 GHz) into a general VHF signal.
(90 to 222 MHz) and UHF (470 to 770 MHz) into a second intermediate frequency signal (665.5 to 769.22 MHz) that can be transmitted in a common reception facility. Mixer 14
The signal is mixed with VHF and UHF signals and sent to the latter part of the joint reception system. The second intermediate frequency signal (665.5 to 769.22MHz), which is distributed by the divider 36 and branched by the divider 35, is sent to the television by the divider 26.
It is separated from the VHF and UHF signals, and converted into a signal of a 1 GHz band satellite broadcasting intermediate frequency (1.22778 to 1.33150 GHz) by a second frequency converter 27,
Enter BS tuner 28. BS tuner 28
The signal of one channel is selected from among the first intermediate frequency signals in the 1 GHz band of the intermediate frequency for satellite broadcasting, is converted into a video signal and an audio signal, and is input to the AV television 31 so that it can be received.

() VHF and UHF TV signals VHF TV broadcasts (90-222MHz) are VHF
It is received by antenna 8 and amplified by amplifier 10. UHF TV broadcast (e.g. 470-638MHz)
is received by a UHF antenna 9 and amplified by an amplifier 10 like VHF. The VHF and UHHF television signals amplified by the amplifier 10 are sent to the mixer 14.
second intermediate frequency signal (665.5~769.22MHz)
and mixed with the received signal and sent to the subsequent joint reception facility. Distributor 3
VHF distributed at 6 and branched at branch 35
The UHF and UHF signals are separated into a second intermediate frequency signal by the splitter 26, and input to the AV television 31, where it becomes possible to receive television VHF and UHF images.

In this way, in contrast to the conventional one, in the embodiment of the present invention, the first frequency converter 5 converts the first intermediate frequency signal of satellite broadcasting in the 1 GHz band to a lower frequency, which is not used for UHF television signals. tv set
It is converted into a signal with the frequency of an empty channel in the UHF band and sent to the subsequent stage, and then transmitted to the second stage at the subscriber's equipment.
Since the frequency converter 27 converts the signal back to an intermediate frequency signal in the 1 GHz band, it is economical because the existing television joint reception equipment for receiving VHF and UHF television signals can be used as is.

Moreover, compared to transmitting high frequencies (1 GHz band) directly into the system, there is less loss in the coaxial cable 34, and the transmission cable and connectors have the advantage of being inexpensive and with a narrow bandwidth.

Further, the first frequency converter 5 sends the power supply voltage from the input terminal 6, and the BS converter 2 can be operated with the power supply voltage.

Furthermore, the second frequency converter 27 can be operated using the power supply voltage that the BS tuner 28 originally sends from the input terminal 29 for operating the BS converter 2, which is economical.

As described above, in the present invention, a person who wishes to receive satellite broadcasting can connect the subscriber device C in front of the AV television 31 in his home, and can watch the television in another room.
It has the effect of making it possible to receive satellite broadcasting only in the room of the person who wishes to receive it, without any negative effect on the reception of V.UHF signals, and without the need for wiring that would harm the aesthetics of the building. .

Moreover, the subscriber device C includes a BS tuner 28 having an input terminal 29 for receiving a 1 GHz band intermediate frequency signal, which is a first intermediate frequency signal, a video output terminal 30a, and an audio output terminal 30b.
and a second intermediate frequency signal whose output terminal 25 is connected to the input terminal 29 of the BS tuner 28.
2nd for converting to intermediate frequency signal of 1GHz band
The conventional configuration includes a frequency converter 27 of
Just a second frequency converter compared to BS tuner 2
Even with an inexpensive configuration that only adds 7, it is effective in making it possible to receive satellite broadcasting under the above conditions.

As described above, the present invention provides a first intermediate frequency signal at the head end of an existing TV V.UHF signal joint reception system in a building.
The existing system is equipped with a first frequency converter 5 for converting an intermediate frequency signal in the 1 GHz band into a second intermediate frequency signal, which is a signal at a frequency of an empty channel in the TV UHF broadcasting allocated band. If the second intermediate frequency signal is sent out to the coaxial cable of This has the effect of making it possible to construct a system that allows those who wish to receive satellite broadcasting to freely receive satellite broadcasting without making any changes.

[Brief explanation of the drawing]

Figure 1 is a system diagram of a satellite broadcasting receiving system, Figure 2
The figure shows the block circuit diagram of the first frequency converter, the third
The figure shows the block circuit diagram of the second frequency converter.
The figure shows a system diagram of a building with a satellite broadcast reception system added to the conventional TV joint reception system. A...Broadcasting satellite, B...Satellite broadcasting mixer, C
...Subscriber equipment, 1...Parabola antenna, 2...
... BS converter, 5 ... First frequency converter, 14 ... Mixer, 8 ... VHF antenna, 9
...UHF antenna, 10...amplifier, 36...
Distributor, 35...brancher, 26...brancher, 27
...Second frequency converter, 28...BS tuner, 31...AV television.

Claims (1)

[Claims] 1 has a VHF antenna 8, a UHF antenna 9, a parabolic antenna 1, and a mixer 14, the VHF antenna 8 and the UHF antenna 9 are connected to the mixer 14, and the first In a community reception system, a converter 2 that outputs an intermediate frequency signal is connected via a first frequency converter 5 for converting the output signal from the converter 2 into a second intermediate frequency signal of a lower frequency. , the subscriber equipment used by being connected to the output side 17 of the mixer 14 has a signal input terminal 35' connected to the output terminal 17 of the mixer 14, and a branching filter 26 at the signal input terminal 35'. A TV V.UHF signal output terminal 33' connected through the TV, and a video signal output terminal 32a' for outputting the video signal of the satellite broadcast signal to the AV TV.
It has an audio signal output terminal 32b' for outputting the audio signal of the satellite broadcast signal to the AV television, and between the branching filter 26 and the video signal output terminal 32a' and the audio signal output terminal 32b'. , a BS tuner 28 having an input terminal 29 for receiving an intermediate frequency signal in the 1 GHz band which is the first intermediate frequency signal, a video output terminal 30a and an audio output terminal 30b;
A series circuit with a second frequency converter 27 connected to the input terminal 29 of the second frequency converter 27 for converting the second intermediate frequency signal into a 1 GHz band intermediate wave signal is connected to the input terminal 29 of the second frequency converter 27. 24 is connected to the output side of the duplexer 26, and the video output terminal 30a and the audio output terminal 30b of the BS tuner 28 are connected to the video signal output terminal 32a' and the audio signal output terminal 32b', respectively. A subscriber device in a community reception system, characterized in that: