JPH06120852A - Satellite broadcast transmission/reception equipment - Google Patents

Abstract

PURPOSE:To receive various types of radio waves through the outdoor antennas and to use indoor these radio waves by transmitting the received signals to a transmission line through only the corresponding antenna corresponding to a relevant address among those antennas and applying the received signals to a a receiver. CONSTITUTION:The vertical polarized radio wave is received by a probe among radio waves incoming to a reception element 3 of an antenna 1a. Then the received signal is amplified by an amplifier circuit and converted into the 1st satellite intermediate frequency by a frequency conversion part. The signal undergone the conversion of frequency is outputted through an output terminal. Meanwhile the transmission of the received signals are stopped by a received signal transmission suppressing means for other antennas 1b and 4. A tuner 30 selects the signal of a desired channel out of those signals by the operation of a user. Then the selected signal is supplied to a TV receiver 31 together with the TV signals. When an address designation switch and a polarized wave designation switch are switched to another state respectively, the received signal is transmitted through the antenna of a designated address only.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention receives radio waves from a plurality of communication satellites (for example, communication satellites such as JCSAT and Super Bird or broadcasting satellites) by an antenna installed outdoors, and receives the received signals among the plurality of received signals. The present invention relates to a device for selecting only one from the above and pulling it into the room with one transmission line to receive it.

[0002]

2. Description of the Related Art There is a receiving facility in which radio waves from a plurality of communication satellites are received by respective antennas, and a large number of received signals obtained are mixed by a mixer and led into a room by one transmission line. In this case, if the frequency band (transmission frequency band) of the received signal from each antenna is in the 1.3 to 1.5 GHz band of the first satellite intermediate frequency that is normally used, interference will occur, so each converter in each antenna will The transmission frequency bands of output received signals are shifted from each other. For example, the frequency band of another received signal is shifted to the higher side with respect to one received signal. In such a facility, selection of reception of radio waves from a plurality of satellites can be performed indoors.

[0003]

However, when all the received signals whose frequency bands are shifted by one transmission line are led indoors, a signal over an extremely wide frequency band passes through the transmission line. Therefore, as a transmission line, an expensive transmission line for a wide band is required, and a received signal of a higher frequency is attenuated more due to the frequency characteristics of the transmission line and reaches the indoors. Problems such as the need for an equalizer to make the receiver input substantially uniform, and the need for expensive broadband components when installing other equipment such as an amplifier or mixer in the transmission line There was a problem.

The present invention has been made to solve the above-mentioned problems (technical problems) of the prior art, and it is possible to select the reception of radio waves from a plurality of satellites by indoor operation, and Even if it is something like this, we can provide satellite broadcasting reception facilities that can receive signals obtained by receiving radio waves through one transmission line in the same frequency band and can easily add antennas. The purpose is to do.

[0005]

In order to achieve the above object, a satellite broadcasting receiving facility according to the present invention receives radio waves from different communication satellites, and outputs a plurality of reception signals having mutually overlapping frequency bands. In a satellite broadcasting receiving facility provided with the above antenna and one transmission line for receiving the received signal from each antenna, an address signal given through the transmission line is set to each antenna. An address discriminating means for outputting a corresponding signal in the case of an address signal and a received signal output restraining means for canceling the restraint of the output of the received signal only when there is an output signal of the discriminating means are provided, while the anti-antenna in the transmission line is provided. A signal sending means for sending an address signal to the transmission line is connected to the end on the side.

[0006]

The radio waves from various communication satellites are received by individual antennas. The address signal is transmitted from the indoor address signal transmitting means to the transmission line. Only the antenna corresponding to the address among the antennas sends the received signal to the transmission line. The received signal is given to the receiver via the transmission line.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1 showing a satellite signal receiving facility, reference symbols 1a to
21 indicates a member installed outdoors, and 1a and 1b are CS
The antenna is composed of a reflecting mirror 2 and a receiving element 3 (for example, a primary radiator with a converter) that receives a radio wave reflected by the reflecting mirror 2 and outputs a received signal. The communication satellites include JCSAT and Super Bird. Each antenna
The received signal obtained from the receiving elements 3 of 1a and 1b is the satellite first intermediate frequency signal, and their frequency bands overlap (about 1300 MHz to 1550 MHz). 1c is a CS antenna to be added. Reference numeral 4 is a BS antenna, and a reflecting mirror 5 and a receiving element 6 (for example, a primary radiator with a converter)
Consists of. The frequency of the reception signal obtained from the reception element 6 is, for example, about 1030 MHz to 1330 MHz, and the frequency band of the reception signal from the reception element 3 partially overlaps. Reference numeral 9 indicates a VHF television antenna, and 10 indicates a UHF television antenna. Next, 11 is a mixer, 12a-12c
Is its input terminal, and 13 is its output terminal. Reference numeral 17 is a transmission line for pulling a received signal from the outdoors to the interior, and for example, a coaxial cable is used. Reference numeral 18 is a mixed amplifier provided on the transmission line 17, and transmission lines 20, 21 are provided at the input terminals for VHF and UHF.
The VHF and UHF antennas 9 and 10 are connected via the.

Next, reference numerals 25, 29 to 32 denote members installed indoors. 25 is a switching operator, 26 is an input terminal, 27 is an output terminal, and 28 is a power input terminal. Reference numeral 29 denotes a receiver, which is composed of, for example, a satellite tuner 30 and a television receiver 31 connected to it. 32 is a power supply device.

Next, FIG. 2A showing the receiving element 3 in detail will be described. Reference numeral 84 is a circular waveguide of a primary radiator, and 85 is an opening for receiving a radio wave. Reference numeral 86 is a vertically polarized wave receiving unit, 87 is a horizontally polarized wave receiving unit, and the probe 8 attached to the waveguide 84 respectively.
It is composed of 8, 90 and pre-stage amplifier circuits 89, 91 connected to each. 92 is a synthesizer. 93 is a well-known frequency conversion unit, which includes a high-frequency amplifier circuit 94, a mixer 95, a local oscillation circuit 96,
The intermediate frequency amplifier circuit 97 is used. Reference numeral 98 is a known power supply separation filter, and 99 is an output terminal. Next, 100 is a signal extraction unit for extracting an address signal and a polarization designation signal. Reference numeral 101 is an address discriminating means for discriminating whether or not the address signal is set to its own antenna, and is composed of a signal separation circuit 102 and an address setting switch 103. The signal separation circuit 102 has an output end according to various pulse trains (pulse train a to pulse train g output from an encoder described later) input to the input end 102a.
The decoders 102b to 102f are in the states shown in Table 1 below. As such a decoder, I
C For example, there is M50117XP manufactured by Mitsubishi Electric. Other equivalent products may be used. The setting switch 103 is connected to the output end 102b of the antenna 1a, the output end 102c of the antenna 1b, and the antenna 1c.
The output terminal 102d is switched to the output terminal 102d, and the antenna 4 is switched to the output terminal 102e in advance. Reference numeral 104 denotes a power switch exemplified as a reception signal transmission suppressing means, which turns on the power supplies of the receiving portions 86, 87 and the frequency converting portion 93 when the signal from the address discriminating means is at the H level, and turns off when the signal is at the L level. I am doing it. The means may be a switch provided between the frequency conversion unit 93 and the power supply separation filter 98. Reference numeral 105 denotes a polarized wave selecting unit, which is for operating the vertical polarized wave receiving unit 86 and the horizontal polarized wave receiving unit 87 interchangeably in response to the polarized wave designation signal, and is one of the signal separating circuits 102. And a switching circuit 106. In the switching circuit 106, the control end 106a of the separation circuit 102 is L.
The contact is switched to the 106V side when the level is set, and to the 106H side when the H level is set. Reference numeral 107 denotes a constant voltage power supply circuit for supplying electric power for operation to each of the above circuit elements.

[0010]

[Table 1]

Next, FIG. 2B showing an example of the circuit of the signal extracting section 100 will be described. 202 and 203 are diodes for interference prevention, 204 and 205 are smoothing capacitors, 206 and 206 ',
207 is a resistor and 208 is a comparator. The signal extraction unit 10
With such a circuit configuration, 0 extracts the address signal and the polarization designation signal that come into the input terminal 201 in a state of being superimposed on the operating power and outputs the extracted signal to the output terminal 209.

Next, FIG. 3 showing an example of the circuit of the mixer 11
(A) will be described. The mixer has a configuration in which a distribution circuit is reversely connected to the input and output, and is of a power supply current passing type. 211 to 213 are distribution transformers, 214 and 215 are matching transformers, 216 to 219 are power source separation filters, and 220 is a current passing circuit for passing a power source current, an address signal, and a polarization designation signal.

Next, FIG. 4 showing the switching operation device 25 and the power supply device 32 in detail will be described. First, the power supply device 32 has a well-known circuit configuration, 61 is a power plug, 62 is a transformer, and 63 is a rectifier circuit, for example, a bridge full-wave rectifier circuit is used. Reference numeral 64 is a smoothing capacitor.

Next, the switching operation device 25 will be described. Reference numeral 66 is a received signal transmission circuit that connects the input end 26 and the output end 27, and 67 is a known power supply separation filter. Next, reference numeral 70 denotes a signal transmitting means for transmitting the address signal and the polarization designation signal toward the input end 26. The signal generating section 71 and the superimposition for superimposing the signal generated thereby on the power for power supply. It is composed of a part 72. The signal generator 71 is a pulse train generation circuit.
73, an addressing switch 78 connected between its inputs 74a-74d and a voltage output 76, and a polarization specifying switch 79 connected between its inputs 75V, 75H and a voltage output 76. There is. As shown in Table 2 below, the pulse train generation circuit 73 is configured by using an encoder that outputs different pulse trains a to g from the output terminal 77 depending on the states of the switches 78 and 79. An example of such an encoder is a remote control IC such as M5 manufactured by Mitsubishi Electric.
There is 0115XP. Other equivalent products may be used.

[0015]

[Table 2]

The pulse trains a to g are repetitions of the six pulses shown in Table 3 below. The first to fourth are address signals, and the fifth and sixth are polarization designation signals.

[0017]

[Table 3]

Next, the superposing section 72 connects the transistors, resistors and the like indicated by the symbols as shown in the drawing to form a signal generating section.
The signals from the pulse train 71 (the pulse train a to the pulse train g) are superimposed on the power supply power sent from the power supply input end 28 to the input end 26 as shown in the figure. Among these, INV is a knot circuit, Q1 is a switching transistor, and Q2 is also a switching transistor.
VH is lower than the input voltage by 0.2 V, for example). R1 and R2 are resistors for voltage division, D1 and D2 are diodes for setting a low voltage value (VL is lower than the input voltage by about 1.5 V), and D3 is a lightning arrester. Reference numeral 80 is a constant voltage circuit that supplies operating power to the selection signal generator 71. Table 4 shows the relationship between the pulse given from the signal generating unit 71 to the superimposing unit 72 and the transistors and the diodes D1 and D2.

[0019]

[Table 4]

Next, in FIG. 5 showing the voltage waveform of the power for power supply on which the address and the polarization designation signal are superimposed, reference numeral 81 indicates a pulse indicating the start of data transmission, and reference numeral 82 indicates data, that is, one pulse train, respectively. The pulses and pulse trains are repeated one after another. The repetition frequency is, for example, 20 to 30 KHz.

Next, the operation of the receiving facility having the above configuration will be described. In FIG. 1, antennas 1a and 1b are transmitted from various communication satellites.
The radio waves arriving at the reflection element 2 are reflected by the reflecting mirror 2 and reach the receiving element 3. Radio waves coming from the broadcasting satellite toward the antenna 4 are reflected by the reflecting mirror 5 and reach the receiving element 6. or,
VHF or UHF TV radio waves are antennas 9 and 10, respectively.
Will be received at.

On the other hand, the electric power for power supply sent from the power supply device 32 reaches the switching operation device 25, and the superposition section 72 (FIG. 4).
(See (1)) to the transmission line 17, reaches the mixer 11 via the transmission line 17, and further reaches the receiving element of each antenna. On the way, the mixing amplifier 18 operates using a part of the electric power. In the receiving element of each antenna, the signal extraction unit 100, the signal separation circuit 102, and the like operate with the above power.

In the above state, when the address designating switch 78 and the polarization designating switch 79 in the switching operator 25 are in the state as shown in FIG. 4, the signal generator 71 outputs the pulse train a of Table 2 and It is sent to the transmission line 17 after being superimposed on the power for power supply through the superimposing unit 72. The pulse train a reaches each receiving element 3 via the transmission line 17. In each receiving element, the pulse train a is extracted by the signal extraction unit 100 and then separated by the signal separation circuit 102. Then, depending on the preset condition of the switch 103, the switch 104 is turned on only in the antenna 1a, and the switch 106 is connected to the terminal 106V.
To the side where the vertical polarization receiver operates. As a result, of the radio waves arriving at the receiving element 3, vertically polarized radio waves are received by the probe 88, and the received signal is an amplification circuit.
Amplified at 89. The signal is further frequency-converted by the frequency converter 93 into the satellite first intermediate frequency and output from the output terminal 99. In the other antennas 1b and 4, the reception signal transmission suppressing means suppresses the transmission of the reception signal. The above signal reaches the tuner 30 via the transmission line 17, the mixing amplifier 18, and the switching operator 25. In the tuner 30, a signal of a favorite channel is selected from the signals by the user's operation, and the signal reaches the television receiver 31. Also, each television signal received by the VHF antenna 9 or the UHF antenna 10 reaches the television receiver 31 via the transmission lines 20 and 21, the mixed amplifier 18, the transmission line 17, the switching operation device 25, and the tuner 30.

When the addressing switch 78 and the polarization specifying switch 79 are switched to other states, the pulse trains b to g in Table 2 are output according to the switching state by the operation equivalent to the above case. The reception signal is transmitted only to the antenna of the designated address.

Next, the case of adding the antenna 1c will be described. In this case, the 3-input mixer 11 is replaced with a 4-input mixer 11 '. Then, the antennas 1a to 1c, 4 and the transmission line 17 are connected. This completes the work. As the mixer 11 ', for example, the one shown in FIG. 3 (B) is used. Note that in FIG. 3B, FIG.
The parts which are considered to be functionally the same as or equivalent to those shown in FIG. 12d is an input terminal, and 218 'is a power supply separation filter.

Next, FIG. 6 shows a different embodiment of the present application, in which an external address discrimination device 301 is attached to the receiving element 3 of the type in which horizontal and vertical polarized waves are switched depending on the level of the power supply voltage in the antenna. By doing so, an example is shown in which the antenna can be switched by specifying the address as described above. In the figure, 302 is an input terminal, 303
Is an output terminal. The reception signal transmission inhibiting means 104 is composed of a switch circuit as shown. Switch circuit
104 is composed of a relay 37 and its drive circuit 38, and the drive circuit 38 is composed of a transistor 39 and a resistor 40. 41 is a diode. The polarization selection unit 105 includes a voltage value changing circuit 304
And a voltage discriminating unit 305 provided in the receiving element 3. The voltage value changing circuit 304 is configured by connecting electronic circuit elements indicated by symbols as shown in the drawing, and when the control input terminal 52 becomes L level, the voltage value of power for power supply is 18V.
When it goes to H level, it is set to 13V.
The voltage discriminating unit 305 includes a comparator 306 and a reference voltage circuit 307 that gives a reference voltage to the comparator 306. Comparator 3
The output of 06 becomes H or L depending on whether the voltage applied to the input terminal 306a is higher or lower than the reference voltage. The reference voltage is high or low of the power for the power source (18V and 13V)
It is set to the middle of the voltage value of. 308 is a smoothing circuit, 309
Is a power source separation filter, 54 is a capacitor that passes high frequency and blocks direct current, and 55 is a coil that passes direct current and blocks high frequency.

In the configuration described above, when the polarization designation signal is vertical (horizontal) polarization, the voltage sent to the receiving element 3 through the voltage changing circuit 304 is 18V (13V),
The switching circuit 106 switches to the terminal 106V (106H) side. In addition, the parts which are considered to have the same or equivalent configurations as those in the previous figure in terms of function are denoted by the same reference numerals as those in the previous figure, and redundant description is omitted.

[0028]

As described above, according to the present invention, there is an advantage that radio waves respectively coming from various communication satellites and the like can be received by an outdoor antenna and a desired one can be selected and used indoors.

Moreover, in the above case, since the received signal is transmitted only from the addressed antenna, there is a feature that only one received signal is drawn through the transmission line 17. This means that no matter which antenna is selected, the signals from those antennas can pass through the transmission line 17 in the same frequency band, and as a result, first, the transmission line 17 is compared. It is possible to use a relatively narrow frequency band, which is inexpensive and, secondly, the attenuation is the same when any signal passes through the transmission line 17, and therefore, an equalizer as in the prior art. Thirdly, when an amplifier or a mixer is provided in the middle of the transmission line 17, it is possible to use inexpensive equipment having a relatively narrow frequency bandwidth. There are numerous effects.

Further, in the present invention, it is determined by addressing whether or not each of the antennas has been selected. Therefore, when adding the antennas, it is easy to add the antennas only by connecting the antennas of the same type. There is an effect that can be.

[Brief description of drawings]

FIG. 1 is a circuit diagram of a satellite broadcast receiving facility.

2A is a circuit diagram of a receiving element, and FIG. 2B is a circuit diagram of a signal extraction unit.

3A is a circuit diagram of a 3-input mixer, and FIG. 3B is a circuit diagram of a 4-input mixer.

FIG. 4 is a circuit diagram of a switching operation device and a power supply device.

FIG. 5 is a voltage waveform diagram of power for power supply.

FIG. 6 is a circuit diagram showing a different embodiment.

[Explanation of symbols]

 1a, 1b, 1c Antenna 17 Transmission line 101 Address discrimination means

Claims (1)

[Claims] 1. A plurality of antennas that receive radio waves from different communication satellites and output reception signals whose frequency bands overlap with each other, and one transmission line for pulling in the reception signals from each antenna. In a satellite broadcasting receiving facility comprising: an address discriminating means for outputting a corresponding signal to each of the antennas when the address signal given through the transmission line is an address signal set therein, and an output signal of the discriminating means. If there is a reception signal output suppression means for releasing the suppression of the output of the reception signal only, the signal transmission means for transmitting the address signal to the transmission line is provided at the end of the transmission line on the side opposite to the antenna. Satellite reception facility characterized by connecting to.