JPS60165832A - Satellite broadcast reception system - Google Patents

Abstract

PURPOSE:To use a common receiver as it is even for common reception by providing a BS converter, the 1st frequency converter and a mixer to a satellite broadcast mixer and providing a branching filter, the 2nd frequency converter and a BS tuner to a subscriber's equipment to utilize effectively the offered satellite broadcast transceiver. CONSTITUTION:A signal from a broadcast satellite A is converted into an intermediate frequency for satellite broadcast of 1GHz by a BS converter 2 in case of satellite broadcast reception, a frequency converter 5 converts it into an intermediate frequency signal (655.5-769.22MHz) possible for transmission by a conventional VHF/UHF common reception installation and mixed with a VHF and UHF signal of antennas 8, 9 at the mixer 14. Then the signal distributed by the distributor 36 and branched by the branching device 35 is branched into the VHF and UHF signal by the branching filter 26, converted into the signal of satellite broadcast intermediate signal of 1GHz band by a frequency converter 27 and enters the BS tuner 28. In the VHF and UHF TV signal, the VHF and UHF signal branched by the branching filter 35 as above is branched into the intermediate frequency signal by the branching filter 26 and enters an AV television set 31. Thus, the existing television common receiver for the VHF and UHF television signal reception is used as it is.

Description

[Detailed description of the invention] The present invention relates to a satellite broadcast receiving system.

Performance standards for equipment for satellite broadcast reception systems have been proposed by the Satellite Broadcast Reception Technology Study Group of the Radio Technology Association. The basics of the satellite broadcasting receiving system proposed by the above-mentioned reception technology research committee is as shown in FIG.
1 to B5-15 (11.71398 in frequency)
~1200950 GHz) broadcast waves and BS
The converter 102 converts the signal to 1.03598
Convert to intermediate frequency signal of ~1.33150GHz,
BS by transmitting coaxial cable 104 from output terminal 103
In addition to the input terminal 106 of the tuner 105, the BS tuner 105 selects only the intermediate frequency signal of the desired satellite broadcast channel, demodulates the selected signal and returns it to a video signal and an audio signal, and outputs the signal to the video signal output terminal 107a. and output from the audio signal output terminal 107b respectively to the AV television 10.
The purpose of this system is to receive the desired satellite broadcast using a display device such as No. 8. The power supply for operating the BS converter 102 is determined to be sent from the input terminal 106 of the BS tuner to the output terminal 103 of the BS converter 102 at a low voltage (DC +15 V). The AC plug 109 is for receiving power for operating the BS Qi-Qi 105 and the power for operating the BS converter 102.

The object of the present invention is to provide a system in which the above-mentioned satellite broadcasting receiving equipment can be used effectively, and in which the usage band of the equipment does not have to be extended to a frequency as high as 1.33150 GHz even in the case of joint reception. Traditional VHF
It is an object of the present invention to provide a satellite broadcasting receiving system that can be used as is and with Ul-IF television joint receiving equipment.

In addition, the broadcasting satellites that will be operated for the time being will be the satellite broadcasting channels mentioned above, from Bs-1i to B5-15 (frequency 11.90578 to 12.00950GHz) L
It is a well-known fact that broadcasts are not broadcast at all times, and the present invention has been made based on this fact.

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

Figure 1 shows a system diagram of a satellite broadcasting receiving system.
A shows the broadcasting satellite Kuyuri-2, which is stationary at a height of about 36,000 meters above the equator at 110 degrees east longitude. As is well known, from broadcasting satellite A, 11.90578-12.0
0950GHz (herein referred to as 12 GHz band)
is transmitting radio waves.

B indicates a satellite broadcast mixing device, which is used to mix satellite broadcasts into a television 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 (off-cent parabolic antenna), which is connected to the broadcasting satellite A.
This is for receiving radio waves in the 12 GHz band sent from

2 is a BS converter that converts the 12GHz band radio waves received by parabolic antenna 1 to 1°22778 to 1°3315.
This is for converting into an intermediate frequency signal of 0 GHz (referred to as I GHz band in this specification).

This frequency is based on the one determined by the Radio Technology Association. 3 is a primary radiator on the input side of the BS converter 2. 4 (,: is an output terminal of the fBS converter 2, which outputs the intermediate frequency signal in the I GHz band, and is also a terminal to which a DC power supply (+15 V) for operating the BS converter 2 is input. 5 is the first With the frequency converter, BS converter 2
Output signal (1°22778~1.33150GHz)
The band assigned to television UHF broadcasting (470
~770MHz), e.g. 665
5 to 769, 22 MHz (herein referred to as an intermediate frequency signal). 6 is the first
This is the input terminal of the frequency converter 5, which inputs the output of the BS converter 2, and is also a terminal which outputs the DC power (+15V) for operating the BS converter 2. 7 is an output terminal of the first frequency converter 5, which outputs an intermediate frequency signal. The configuration of the first frequency converter 5 is shown in FIG.

Components corresponding to those in FIG. 1 are designated by the same reference numerals. 37 is an AC plug to which 100V AC power is applied. 38 is a bypass filter that passes I GHz band signals and blocks direct current. A low-pass filter 040 that passes DC and blocks signals in the I GHz band is a power supply circuit that generates 15V DC from 100V AC. 41 is a power supply separation filter 042 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 6655ME (pass filter that passes intermediate frequency signals below z), and a TV VHF and UHF signal (for example, a 638ME (
A combination of a low-pass filter and a low-pass filter that passes signals with frequencies below z is used. 15 is mixer 14
It is a terminal into which the signal output from the first frequency converter 5 is input. 16 is the second input terminal of the mixer 14, which is a terminal into which the signal output from the amplifier 10 is input. 34 indicates a coaxial cable, and 0 or more indicate the configuration of the satellite broadcast mixing device B.

Next, 8 is a VHF antenna, which is used to receive television waves of 90 to 222 MHz sent from VHF broadcasting stations. 9 is a UHF antenna, for example, UHF
It is used to receive television waves of 470 to 638 MHz sent by broadcasting stations. 10 is an amplifier,
It amplifies the signals received by the VHF antenna 8 and the UHF antenna 9. 11 is a VHF input terminal of the amplifier 10. 12 is a UHF input terminal of the amplifier 10.

Reference numeral 13 denotes a terminal for mixed output of UHF and VHF in the amplifier 10. 36 is a distributor, TV VHF and U
It distributes HF band signals (90 to 770 MH2). 35 is a splitter, also called a series unit, which handles TV VHF and UHF band signals (90 to 770
1V [Hz] is branched and supplied to subscribers. 34 indicates a coaxial cable that connects each device.

Above VHF antenna 8, UHF antenna 9, amplifier 1
0, the distributor 36, and the splitter 35 can use existing equipment for television VHF and UHF joint reception systems.

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 receives TV VHF and UHF band signals (90 to 770 Ml(z)) from the splitter 35, and receives TV VHF and UHF signals (in this example, 638 Ml(z)). (the following signals) and an intermediate frequency signal for satellite broadcasting.

The circuit configuration is the same as that of the mixer 14 with the input and output reversed. 21 is the input terminal of the duplexer 26;
The aforementioned television VHF and UHF band signals are added.

22 is a first output terminal, from which the 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.

A second frequency converter 27 converts an intermediate frequency signal of satellite broadcasting within the television UHF band to an intermediate frequency signal of the I GHz band. 24 indicates an input terminal of the second frequency converter 27. 25 is the second frequency converter 2
7 output terminals are shown. An intermediate frequency signal in the I GHz band is output from the output terminal 25, and a DC power supply (+15V) for operating the second frequency converter 27 is provided.
is applied to the output terminal 25 from the BS tuner 28, which will be described later. The configuration of the second frequency converter 27 is shown in FIG. 1st
Components corresponding to those in the figures are indicated with the same reference numerals.

44 is a bypass filter that passes I GHz band signals and blocks direct current. 45 is a low-pass filter that passes DC and blocks I GHz band signals; 046 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 I GHz band signals sent from the second frequency converter 27, demodulates the selected signal, and converts it into a video signal. , and return it to an audio signal (baseband signal). The video signal and audio signal are sent to the subsequent stage from the output terminal. Also, the power supply (+15V) for operating the equipment in the previous stage is sent out from the input terminal. 29 is the input terminal of the BS tuner 28, 3oa is the video output terminal of the BS tuner 28, 3
0b indicates an audio output terminal, and 031 indicates an AV television. 32a is a video input terminal of the AV television 31;
b indicates an audio input terminal, respectively. 33 is AV TV 3
This is the 1st TV signal input terminal. Reference numeral 37 indicates an AC plug for receiving power source voltage AC100V for operating each device.

The operation of the satellite broadcast receiving system having the above configuration will be explained. AC 100V is applied to the ACC grab 3 of the first frequency converter 2, and the power supply circuit 40 is activated to operate the frequency conversion circuit 42. At the same time, an operating voltage is sent to the BS converter 2, and the BS Converter 2 also operates.

On the other hand, AC 1 is also connected to the AC plug 37 of the BS tuner 28.
oov is applied, the BS tuner 28 itself operates, and an operating voltage is sent to the second frequency converter 27, which is applied to the power supply terminal 48 via the low-pass filter 45, and the frequency conversion circuit 47 also operates. .

(1) Satellite broadcasting From satellite A to 11.90578-12.00950G
Transmitting Hz radio waves, received by parabolic antenna 1, and received by BS converter 2 from 1.22778 to 1.331
Convert to 50 GHz intermediate frequency for satellite broadcasting. Furthermore, the first frequency converter 5 converts the satellite broadcasting intermediate frequency signal (1,22778 to 1.33150 GHz) into general VHF (9i) to 222 MHz) and 769,2
2 MHz). VHF and U in mixer 14
After the HF signal is mixed with the joint reception system 26, it is separated from the television VHF and UHF signals, and the second frequency converter 27 converts it into a satellite broadcasting intermediate frequency (1, 2) in the I GHz band.
2778 to 1.33150 GHz) and enters the BS tuner 28. The BS tuner 28 selects one channel signal from among the I GHz band signals of the intermediate frequency for satellite broadcasting, converts it into a video signal and an audio signal, and allows the AV television 31 to receive the signal.

(IF) VHF and UHF (7) Television Signal A vHF television broadcast (90 to 222 MHz) is received by a VHF antenna 8 and amplified by an amplifier 10 . UHF television broadcasts (for example, 470 to 638 t) are received by a UHF antenna 9 and amplified by an amplifier 10 like VHF. The VHF and UHF television signals amplified by the amplifier 10 are converted into intermediate frequency signals (665,5 to 769.
22MHz) and sent to the subsequent joint reception facility. The VHF and UHF signals distributed by the splitter 36 and branched by the splitter 35 are separated into intermediate frequency signals by the splitter 26, and then enter the AV television 31, where it becomes possible to receive television VHF and UHF signals.

As described above, in contrast to the one shown in FIG. 4, in the embodiment of the present invention,
The first frequency converter 5 converts the intermediate frequency signal of satellite broadcasting in the I GHz band into a signal of an even lower frequency, moreover, a signal of the frequency of an empty channel in the television UHF band that is not used for UHF television signals, and sends it to the subsequent stage. However, at the subscriber's device, the second frequency converter 27 converts the signal back to an intermediate frequency signal in the I GHz band.
It is economical because the existing TV joint reception equipment for receiving TV signals can be used as is.

Moreover, compared to passing high frequencies (I GHz band) directly into the system, there is less loss in the coaxial cable 34, and the transmission cables and connectors also have the advantage of being inexpensive and narrow in the band used. .

Further, the first frequency converter 5 sends a power supply voltage from the input terminal 6, and the BS converter 2 can be operated using 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 satellite broadcasting receiving system of the present application,
In addition to the VHF and UHF television broadcasts broadcast in the area, it is also possible to enjoy satellite broadcasts.

Moreover, even with such a system, VHF and UH
The equipment for the F-TV joint reception system can be used as is for receiving satellite broadcasts, and a large number of joint reception subscribers can enjoy satellite broadcasts in addition to television broadcasts.

Furthermore, the BS converter and BS tuner are economical because they can effectively use the standards proposed by the Radio Technology Association for power transmission/reception methods and frequency bands.

[Brief explanation of the drawing]

Figure 1 is a system diagram of the satellite broadcasting receiving system, and Figure 2 is the system diagram of the satellite broadcasting receiving system.
FIG. 3 is a block circuit diagram of a second frequency converter, and FIG. 4 is a system diagram of a conventional satellite broadcast receiving system. A...Broadcasting satellite, B...Satellite broadcasting mixer, C...
・Subscriber equipment, 1...parabolic antenna, 2...B
S 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---BSf, -ner, 31...
AV TV 0 Patent applicant Maspro Electric Works Co., Ltd. Representative Takashi Hatayama Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] A satellite broadcast reception/system comprising a satellite broadcast mixing device, a VHF and UHF television joint reception device, a subscriber device, and a television connected to the subscriber device, the satellite broadcast mixing device comprising a parabolic antenna and a parabolic antenna. The subscriber equipment is composed of a BS converter, a first frequency converter, and a mixer, and the subscriber equipment is composed of a branching filter, a second frequency converter, and a BSS tuner, and the above-mentioned B in the satellite broadcasting mixer is
The S converter is configured to receive power for operation from the first frequency converter, and the second frequency converter of the subscriber equipment is configured to receive power for operation from the BS tuner. A satellite broadcast receiving system characterized by: