JPH05136704A - Satellite broadcast receiving installation - Google Patents

Abstract

PURPOSE:To allow an indoor installation to receive a reception signal having the same frequency band through a transmission line by devising the installation such that an outdoor switching device is changed over corresponding to a reception element selection signal and a vertical or horizontal polarized wave reception section of a reception element is selected corresponding to the reception element selection signal. CONSTITUTION:Radio waves from various communication satellites or the like reach individual reception elements 3-5, 8. A reception element selection signal and a polarized wave selection signal are sent to a transmission line 17 from a select signal transmission means included in an indoor switching controller 25. A reception element switching control means included in a switching device 14 receives a reception element select signal from the transmission line 17 to select the switching device 14 accordingly. Furthermore, a vertical polarized wave reception section or a horizontal polarized wave reception section is selected by a polarized wave switching section corresponding to the polarized wave selection signal in the reception element selected by the changeover device 14. Thus, only the reception signal obtained from a radio wave received by the selected reception section in the reception element selected among the arrived radio waves from the various communication satellites or the like is sent to the transmission line 17.

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 obtains received signals respectively. The present invention relates to an apparatus for selecting only one of a plurality of received signals, pulling it into a room with a single transmission line, and receiving the signal.

[0002]

2. Description of the Related Art Radio waves from a plurality of communication satellites are received by one multi-beam antenna to obtain a plurality of reception signals, and other antennas receive radio waves from another communication satellite to obtain the reception signals. There is a receiving facility in which a large number of these received signals are mixed by a mixer and led into a room by one transmission line.

[0003]

[Problems to be Solved by the Invention] In such a facility, it is convenient to select a desired radio wave indoors. In this case, the frequency band (transmission frequency band) of the reception signal output from the reception element that receives the radio waves from each communication satellite is
Since the interference occurs in the 1.3 to 1.5 GHz band at the first intermediate frequency of the commonly used satellite, the converter of each receiving element shifts the transmission frequency band of the received signal output from each other. .. For example, the operation is performed to shift the frequency band of another received signal to the higher side with respect to one received signal. However, if all the received signals whose frequency bands are shifted by one transmission line are led indoors, a signal over an extremely wide frequency band will pass through the transmission line. Therefore, as a transmission line, an expensive transmission line for a wide band is required, and because the received signal of a higher frequency is greatly attenuated due to the frequency characteristics of the transmission line, it reaches the inside of the room.
For the problem that an equalizer is required to make the signal level of each received signal approximately uniform at the receiver input, and when other equipment such as an amplifier or mixer is installed in the transmission line There was a problem that expensive things were needed.

The present invention has been made to solve the above-mentioned problems (technical problems) of the prior art. It is a plurality of radio waves arriving from various communication satellites, etc. Of course, it is possible not only to receive the desired signal from a certain radio wave indoors through the transmission line by selecting it indoors, but even in such a case, the received signal of each radio wave is transmitted in the same frequency band. It is an object of the present invention to provide a satellite broadcasting receiving facility that can be passed through a line and has a narrow transmission bandwidth.

[0005]

In order to achieve the above object, the satellite broadcasting receiving facility according to the present invention receives a plurality of radio waves from different communication satellites and outputs reception signals whose frequency bands overlap with each other. In a satellite broadcasting receiving facility provided with the receiving element of 1 and a transmission line for pulling the plurality of received signals from the outdoors to the indoor, each of the receiving elements is
A vertically polarized wave receiving section and a horizontally polarized wave receiving section are respectively provided for receiving vertically polarized waves and horizontally polarized waves from the above-mentioned communication satellites, and they are exchanged. A polarization switching unit for operating is provided, and the reception signals from the plurality of receiving elements are selectively applied to the transmission line between the plurality of receiving elements and the outdoor end of the transmission line. While the receiving element switching means for transmitting the receiving element selection means for transmitting the receiving element selection signal and the polarization selection signal to the transmission line is connected to the indoor end of the transmission line. The receiving element switching means is connected to a receiving element switching control means for receiving the receiving element selection signal from the transmission line to switch the receiving element switching means, and further, the receiving element switching means or each of the receiving elements. The element receives the polarization selection signal from the above transmission line and A polarization switching unit is obtained by attaching a polarization switching control means for corresponding switching.

[0006]

The radio waves from various communication satellites reach the individual receiving elements. A reception element selection signal and a polarization selection signal are sent to the transmission line from the indoor selection signal sending means. The receiving element switching control means receives the receiving element selection signal from the transmission line, and switches the receiving element switching means correspondingly. Further, in the receiving element selected by the receiving element switching means, the vertical polarization receiving section or the horizontal polarization receiving section is selected by the polarization switching section in response to the polarization selection signal. As a result, among the incoming radio waves from the various communication satellites and the like, only the received signals obtained from the radio waves received by the selected receiving element and by the selected receiving unit are sent 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 numerals 1 to 1
Reference numeral 21 denotes a member to be installed outdoors. Reference numeral 1 denotes a satellite antenna, which is called, for example, a multi-beam antenna. One reflecting mirror 2 and a plurality of communication satellites reflected by the reflecting mirror 2. A reception element 3, 4, 5 (for example, a primary radiator with a converter) that individually receives each radio wave from the above and outputs a reception signal is used. Examples of the communication satellites include JCSAT and Super Bird, and the reception signals obtained by receiving the radio waves from the JCSAT and the Super Bird at each reception element, for example, the satellite first intermediate frequency is 130
At 0 MHz to 1550 MHz, the respective frequency bands completely overlap each other. 6 is another satellite antenna for receiving radio waves from broadcasting satellites,
It consists of a reflector 7 and a receiving element 8 (eg a primary radiator with a converter). The frequency of the received signal obtained from the receiving element 8 is, for example, about 1030 MHz to 1330 MHz,
The frequency bands of the reception signals from the reception elements 3, 4, and 5 partially overlap. 9 is a VHF TV antenna,
Reference numerals 10 indicate UHF television antennas, respectively. Next, a switch 14 has a plurality of input terminals 15a to 15d and an output terminal 16, and the above-mentioned receiving elements are connected to the respective input terminals.
17 is a transmission line for pulling the received signal from the outside to the inside,
For example, a coaxial cable is used, and its end on the outdoor side is connected to the output end 16. Reference numeral 18 denotes a mixed amplifier provided in the transmission line 17, which amplifies a reception signal sent through the transmission line 17 and additionally pulls in VHF and UHF television reception signals indoors by using the common transmission line 17. The VHF and UHF antennas 9 and 10 are connected to the input terminals for VHF and UHF via transmission lines 20 and 21, respectively.

Next, reference numerals 25, 29 to 32 denote members installed indoors. Reference numeral 25 denotes a switching operator, which is an input end 26 to which the indoor end of the transmission line 17 is connected, an output end 27, and a power input end.
28 and. 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. 2 showing the switch 14 in detail will be described. Reference numeral 35 is a receiving element switching means, and a plurality of switch circuits
It is composed of 36a to 36d. The switch circuit 36a is a relay
37 and its drive circuit 38. The drive circuit 38 is composed of a transistor 39 and a resistor 40. 41 is a diode. The other switch circuits 36b to 36d are the above switch circuits 35.
It has the same configuration as a. Reference numerals 34a to 34d denote control input terminals of each switch circuit.

Next, reference numeral 42 denotes a receiving element switching control means, which is composed of a selection signal extracting section 43 and a control section 44 for controlling the receiving element switching means 35 by the selection signal extracted thereby. The selection signal extraction unit 43 is configured by a pulse extraction circuit configured by connecting various electronic circuit elements indicated by symbols as shown in the drawing. In addition, Q4 is a transistor for pulse extraction, and Q5 and Q6 are transistors for phase inversion. The control unit 44 outputs the output ends 46a to 46d, 47 according to various pulse trains (pulse train a to pulse train g output from an encoder described later) input to the input end 45.
Is used by the decoder having the states shown in Table 1 below. As such a decoder, there is a remote control IC, for example, M50117XP manufactured by Mitsubishi Electric. Other equivalent products may be used.

[0011]

[Table 1]

Next, reference numeral 50 denotes a polarization switching control means, which utilizes the selection signal extraction section 43 and the control section 44, and controls the control section 44 between the reception element switching means 35 and the output terminal 16. It is configured by connecting an interposed polarization switching signal transmission circuit 51. The polarization switching signal sending circuit 51 is for sending the polarization switching signal corresponding to the polarization selection signal to the receiving element selected by the receiving element switching means 35, and in this example, as the polarization switching signal. , The voltage value of the power supply power sent to the receiving element is high or low, for example, the difference between 18V and 13V is used, and the polarization switching signal transmission circuit 51 changes the voltage value of the power supply power. Circuit is used. The circuit 51 is formed by connecting electronic circuit elements shown by symbols as shown in the drawing. 52 is a control input terminal of the circuit 51.

In the switching device 14, reference numeral 53 is a power source separation filter, 54 is a capacitor for passing high frequency and blocking direct current, and 55 is a coil for passing direct current and blocking high frequency. 56 is an extraction circuit 43, a control unit 44, a polarization switching signal transmission circuit
Reference numeral 51 shows a constant voltage power supply circuit for supplying electric power for operation.

Next, FIG. 3 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 reception signal transmission circuit, which connects the input end 26 and the output end 27, and a well-known power supply separation filter 67 is interposed in the middle.

Next, reference numeral 70 is a selection signal transmitting means for transmitting the reception element selection signal and the polarization selection signal to the input terminal 26, and the selection signal generator 71 and the selection signal generated thereby are supplied to the power source. It is composed of a superimposing section 72 for superimposing it on the power for use. The selection signal generation unit 71 includes a pulse train generation circuit 73,
It comprises a receiving element selection switch 78 connected between the input terminals 74a to 74d and the voltage output terminal 76, and a polarization selection switch 79 connected between the input terminals 75V, 75H and the voltage output terminal 76. .. As shown in Table 2 below, the pulse train generation circuit 73 is configured using an encoder in which different pulse trains a to g are output from the output terminal 77 depending on the states of the switches 78 and 79. As such an encoder, an IC for remote control, for example, M5011 manufactured by Mitsubishi Electric
There are 5 XP. Other equivalent products may be used.

[0017]

[Table 2]

Next, the superimposing section 72 connects the transistors, resistors and the like indicated by the symbols as shown in the drawing, and selects signals from the selection signal generating section 71 (the pulse train a to the pulse train g).
Is superimposed on the power for power supply sent from the power supply input end 28 to the input end 26 as shown in FIG. Of these, Q1,
Q2 is a transistor, ZD is a Zener diode, R3
Are resistors R4 and R5 for setting the voltage value (VH in FIG. 5) of the high voltage part in the power for power supply on which the selection signal is superimposed.
Is a resistor for setting the voltage value (VL in FIG. 5) of the low voltage part of the power, and VR1 is a variable resistor for setting the maximum value of the voltage of the power supply power to be output. Reference numeral 82 is a constant voltage circuit that supplies operating power to the selection signal generator 71.

In FIG. 5, reference numeral 81 is a pulse indicating the start of data (selection signal) transmission, and 82 is a pulse train of data, that is, a set of selection signals consisting of one reception element selection signal and one polarization selection signal. Are shown respectively. The repetition frequency is, for example, 20 to 30 KHz.

Reference will now be made to FIG. 4, which shows the receiving element 3 in detail. Reference numeral 84 is a circular waveguide of the primary radiator, and 85 is an opening for receiving a radio wave. Reference numeral 86 is a vertically polarized wave receiving unit, and 87 is a horizontally polarized wave receiving unit, which are configured by probes 88 and 90 attached to the waveguide 84 and pre-stage amplifier circuits 89 and 91 connected to them. 9
2 is a synthesizer. Reference numeral 93 is a well-known frequency conversion unit, which includes a high frequency amplifier circuit 94, a mixer 95, a local oscillation circuit 96, and an intermediate frequency amplifier circuit 97. Reference numeral 98 is a known power supply separation filter, and 99 is an output terminal. Next, 100 is a polarization switching unit for operating the vertical polarization receiving unit and the horizontal polarization receiving unit interchangeably, and a determination unit 101 for determining a polarization switching signal and a switching circuit 102 responsive to the output thereof. It consists of and. Discrimination unit 101
Is composed of a comparator 103 and a reference voltage circuit 104 which supplies a reference voltage thereto. The comparator 103 outputs or does not output depending on whether the voltage applied to the input terminal 103a is higher or lower than the reference voltage. The reference voltage is set to the middle of the high and low voltage values (18V and 13V) of the power for the power supply. The switching circuit 102 has a contact connected to the 102H side when the control terminal 102a receives a signal, and a contact connected to the 102V side otherwise. A relay is used as the switching circuit 102, for example. Reference numeral 105 is a smoothing circuit, and 106 is a constant voltage power supply circuit for supplying operating power to each of the above circuit elements.
The other receiving elements have the same configuration.

Next, the operation of the receiving facility having the above configuration will be described. In FIG. 1, radio waves coming from various communication satellites toward the antenna 1 are reflected by the reflecting mirror 2 and arrive at the receiving elements 3, 4, and 5. Radio waves coming from the broadcasting satellite toward the antenna 6 are reflected by the reflecting mirror 7 and arrive at the receiving element 8. Further, VHF or UHF television radio waves are received by the antennas 9 and 10, respectively.

On the other hand, the power for power supply sent from the power supply device 32 reaches the switching operation device 25, and the superposition section 72 (FIG. 3).
It is sent out to the transmission line 17 via the reference line) and reaches the mixing amplifier 18 via the transmission line 17. The mixed amplifier 18 operates using a part of the power. The electric power further reaches the switch 14 via the transmission line 17. In the switching device 14, the above electric power is shown in FIG.
The constant voltage power supply circuit 56 shown in FIG.

When the receiving element selection switch 78 and the polarization selection switch 79 in the switching operator 25 are in the states as shown in FIG.
Pulse train a of the above is output, and the pulse train a is superimposed on the power for power supply through the superimposing unit 72 and is transmitted to the transmission line 17. The pulse train a reaches the output end 16 of the switch 14 of FIG. 2 via the transmission line 17. In the switch 14, the selection signal extraction unit 43 extracts the pulse train and supplies it to the control unit 44.
Then, as is apparent from Table 1, in the control unit 44, the output end 46a becomes H as a function of the control unit 44 in the reception element switching control means 42, and the output end 47 becomes H as a function of the control unit in the polarization switching control means 50. Becomes The output of the output terminal 46a is given to the switch circuit 36a of the switching means 35, and the relay 37 becomes conductive. The output of the output terminal 47 is given to the polarization switching signal transmission circuit 51, and the voltage value reaching the switch circuits 36a to 36d via the circuit 51 becomes a low voltage (13V). As a result of the above, low-voltage power supply power is output only from the input end 15a.

The low-voltage power source power reaches the receiving element 3. Then, in the receiving element 3 (see FIG. 4), the power is applied to the frequency conversion unit 93 to operate. The polarization switching unit 100 operates the vertical polarization receiving unit 86 by the component of the polarization switching signal (having a low voltage of 13V) in the power. That is, the low voltage is discriminated by the comparator 103, the switching circuit 102 has a contact connected to the side of 102 V, and power is supplied to the amplifier circuit 89, which 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 amplified by the amplifier circuit 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. The signal reaches the input end 15a of the switch 14, passes through the switch circuit 36a and the power source separation filter 53, and reaches the output end 16. And transmission line 17,
The tuner 30 is reached via 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 a user's operation, and the signal reaches the television receiver 31. Also VHF antenna 9 and U
Each television signal received by the HF antenna 10 reaches the television receiver 31 via the transmission lines 20 and 21, the mixed amplifier 18, the transmission line 17, the switching operator 25, and the tuner 30.

When the receiving element selection switch 78 and the polarization selection 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 other receiving elements 4, 5 and 8 are selected in the switch 14, and the horizontal polarization or the vertical polarization is selected in the receiving elements 4 and 5.

Next, FIGS. 6 and 7 showing another embodiment of the present application will be described. In this example, for the reception element selection signal and the polarization selection signal sent from the switching operator, the switching element 14e selects the reception element using only the reception element selection signal, and the polarization selection signal is the reception element. In the example shown in FIG.
In the figure, 50e is a polarization switching control means provided in each receiving element, and is similar to the selection signal extracting section 43e and the control section 44e in the receiving element switching control means 42e.
It is composed of 110 and a control unit 111. The control unit 111 has the relationship between the pulse train entering the input terminal 111a and the output of the output terminal 111b as shown in Table 3 below.

[0027]

[Table 3]

In the configuration described above, when the pulse train including the polarization selection signal arrives at the receiving element, the output terminal 111b of the control unit 111 correspondingly changes to the state as shown in Table 3 and the switching circuit 102e switches. .. In addition, parts that are considered to be the same or equivalent in configuration to those in the previous figure in terms of function are denoted by the same reference numerals as those in the previous figure with the letter e added to omit redundant description.

[0029]

As described above, according to the present invention, when the radio waves coming from various communication satellites and the like are received and it is desired to use the radio waves indoors, the reception element selection signal is sent from the indoor selection signal transmitting means 70. And by sending a polarization selection signal to the transmission line 17, one of the plurality of receiving elements is selected in the receiving element switching means 35, and the vertical polarization or horizontal polarization in the selected receiving element. One of the receiving units 86, 87
Is selected, only the reception signal obtained from the radio wave received by the receiving section is sent to the transmission line 17 for signal introduction, and the radio wave of the desired polarization from the desired communication satellite can be selectively received indoors. There are advantages.

Moreover, even if a desired one of a plurality of radio waves can be selectively received indoors as described above, when the radio waves are received, the selection is made as described above. There is a feature that only one reception signal is drawn through the transmission line 17 for signal introduction. This means that no matter which satellite receives radio waves, those received signals can be passed through the transmission line 17 in the same frequency band. As a result, firstly, the transmission line 17 is It is possible to use a relatively narrow frequency band and an inexpensive one. Secondly, no matter which radio wave is selected, the attenuation when the received signal passes through the transmission line 17 is the same. Therefore, there is no need for an equalizer as in the prior art, and thirdly, when an amplifier, a mixer, or the like is provided in the middle of the transmission line 17, those devices have a relatively narrow frequency bandwidth. There are various effects such as the availability of inexpensive ones.

[Brief description of drawings]

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

FIG. 2 is a circuit diagram of a switching device.

FIG. 3 is a circuit diagram of a switching operation device.

FIG. 4 is a circuit diagram of a receiving element.

FIG. 5 is a voltage waveform diagram of power for power supply on which a selection signal is superimposed.

FIG. 6 is a circuit diagram showing another embodiment of the switch.

FIG. 7 is a circuit diagram showing another embodiment of the receiving element.

[Explanation of symbols]

 3 receiving element 14 switching device 17 transmission line 25 switching operator 35 receiving element switching means 42 receiving element switching control means 50 polarization switching control means 70 selection signal sending means 86 vertical polarization receiving section. 87 Horizontal polarization receiver. 100 polarization switching section.

Claims (1)

[Claims] 1. A plurality of receiving elements for receiving radio waves from different communication satellites and outputting received signals whose frequency bands overlap with each other, and one receiving element for pulling the plurality of received signals indoors from outdoors. In a satellite broadcasting receiving facility provided with a transmission line, each of the receiving elements is provided with a vertically polarized wave receiving unit for receiving vertically polarized waves and horizontally polarized waves of radio waves from the communication satellite or the like. In addition to having a horizontal polarization receiver, it is provided with a polarization switching unit for operating them interchangeably, and between the plurality of receiving elements and the outdoor end of the transmission line. While the receiving element switching means for selectively applying the receiving signals from the plurality of receiving elements to the transmission line is provided, the indoor side end of the transmission line is provided with the receiving element selection signal on the transmission line. A selection signal transmission means for transmitting the polarization selection signal The reception element switching means is connected to the reception element switching control means for receiving the reception element selection signal from the transmission line and switching the reception element switching means. A satellite broadcast receiving facility, wherein each receiving element is provided with a polarization switching control means for receiving a polarization selection signal from the transmission line and correspondingly switching the polarization switching unit.