JP2000151447A - Satellite signal changeover device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To supply a sufficient operating current even to a booster so that an output level of the booster or the like reaches a desired level. SOLUTION: Input terminals 22, 24 receive a satellite signal with plural frequencies at least partly in duplicate that is outputted from a converter 6 ancillary to a reception antenna 4 receiving a satellite radio wave from a stationary satellite, Output terminals 8, 10, 12, 14 receive a superimposing signal resulting from superimposing a control signal being a non-DC signal that results from converting a DC voltage from a receiver 112 for a satellite signal on a DC voltage from an external power supply 110. A changeover switch 46 (48, 50, 53) is placed between input terminals 22, 24 and the output terminal 8 (10,12,14) respectively, selects one of the satellite signals in response to the control signal and gives the selected signal to the output terminal. DC voltage paths 80, 82 are formed between the input terminals 22, 24 and the output terminals 8, 10, 12, 14 and a DC voltage is fed to a selected terminal in the input terminals 22, 24 in response to the control signal and fed to the converter 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a satellite signal switching device which receives a radio wave transmitted from a communication satellite by a satellite communication receiving antenna, and switches and outputs a plurality of satellite signals frequency-converted by a converter of the antenna. .

[0002]

2. Description of the Related Art Conventionally, as a satellite signal switching device as described above, there is a device disclosed in, for example, Japanese Patent Application Laid-Open No. 10-185858. This device is connected to a satellite receiving antenna provided with a converter that receives signals of vertical polarization and horizontal polarization transmitted from a communication satellite, converts the frequency of each polarization signal, and outputs the converted signal. A vertical polarization signal and a horizontal polarization signal from the converter are supplied to a pair of input terminals, and distribution means for distributing the vertical polarization signal and the horizontal polarization signal to a plurality is provided. Is provided. The switching means selects and outputs one of the input horizontal polarization signal and vertical polarization signal. An output terminal is provided corresponding to each of the switching means, and an output signal of the corresponding switching means is supplied to the output terminal. A polarization switching signal is supplied to these output terminals, and the switching means selects a horizontally polarized signal or a vertically polarized signal in accordance with the polarization switching signal. Also,
This polarization switching signal is supplied from the input terminal to the converter as a power supply signal for the converter.

[0003]

However, in such a satellite signal switching apparatus, in order to compensate the signal levels of the horizontal polarization signal and the vertical polarization signal supplied to each input terminal,
A booster may be arranged between each input terminal and the converter. In this case, the power supply signal of each booster also
It is desirable to use the polarization switching signal because there is no need to provide a power supply dedicated to the converter. Incidentally, the polarization switching signal is often supplied from a tuner for satellite communication reception connected to the output terminal. However, the capacity of the power supply unit that generates the polarization switching signal of this tuner is only enough to operate the converter. There was a problem that it could not be operated to obtain a level output.

It is an object of the present invention to provide a satellite signal switching device capable of supplying a sufficient operating current to a booster so that the output level of the booster or the like becomes a desired level.

[0005]

SUMMARY OF THE INVENTION The present invention for solving the above-mentioned problems has a plurality of frequencies output from a converter attached to a satellite receiving antenna for receiving satellite radio waves from a geostationary satellite at least partially. A plurality of input terminals to which overlapping satellite signals are respectively supplied, a non-DC control signal obtained by converting a DC voltage from the satellite signal receiver, and a DC voltage from an external power supply device are superimposed. An output terminal to which a superimposed signal is supplied, and between the input terminal and the output terminal, one of the satellite signals is selected in response to the control signal and supplied to the output terminal. Selection means, and the DC voltage is provided between the input terminal and the output terminal, and supplies the DC voltage to a selected one of the input terminals in response to the control signal, and supplies the DC voltage to the converter. Just And the route has. As the satellite signal, it is also possible to use horizontal and vertical polarization intermediate frequency signals from a converter attached to a satellite communication receiving antenna that receives radio waves transmitted from a communication satellite,
Such a signal and a satellite broadcast intermediate frequency signal from a converter attached to a satellite broadcast receiving antenna for receiving a radio wave transmitted from a broadcast satellite can also be used. As the non-DC control signal, a rectangular pulse signal or a sine wave signal can be used. One or more output terminals can be provided. Amplifying means may be provided between the input terminal and the converter.

According to the satellite signal switching device, of the satellite signals supplied to the plurality of input terminals, the one selected by the selection means in response to the non-DC control signal is supplied to the output terminal. Further, a DC voltage is supplied to an input terminal for supplying a satellite signal supplied to the output terminal via a DC voltage path controlled in response to a non-DC control signal, and the converter operates. In this satellite signal switching device, a DC voltage is supplied from an external power supply to an output terminal, and this is supplied to a DC voltage path,
Since the power is supplied to the converter via the input terminal, even if an amplifier is provided between the input terminal and the converter, the amplifier can be operated in a normal state. As a control signal of the selection means, a DC voltage may be used. However, it is impossible to superimpose a DC voltage as a control signal and a DC voltage for operating the converter and supply the superposed DC voltage to an output terminal. is there. Therefore, the satellite signal switching device of the present invention converts a DC voltage as a control signal into a non-DC voltage,
It is superimposed on the DC voltage for operation and supplied to the output terminal.

A plurality of the output terminals can be provided. A selection means is provided between each output terminal and each input terminal corresponding to each output terminal, and each output terminal is connected to each of the input terminals via a common DC path. The selection means is controlled by the control means for the selection means provided for each of them, and the common DC path is controlled by one control means provided for the control means.

In this case, only one common DC path is provided, even though a plurality of output terminals are provided, and only one control means is provided.

[0009] A non-overlapping signal input terminal to which a non-overlapping signal whose frequency band does not overlap with each of the satellite signals may be provided. A non-overlap signal from the non-overlap signal input terminal is supplied to each output terminal. A DC path is separately formed from each output terminal to a non-overlapping signal input terminal. When the satellite signal is a vertically and horizontally polarized satellite communication signal, a satellite broadcast intermediate frequency signal, a terrestrial broadcast signal, or a CATV signal can be used as the non-overlapping signal. The non-overlap signal can be mixed with the satellite signal and supplied to the selection means, or can be mixed with one satellite signal output from the selection means and supplied to each output terminal.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A signal switching device 2 according to an embodiment of the present invention attaches vertically polarized and horizontally polarized radio waves from a communication satellite received by a communication satellite receiving antenna 4 to the antenna 4. Selected from among the vertically and horizontally polarized first intermediate frequency signals V and H (hereinafter abbreviated as a vertically polarized satellite communication signal and a horizontally polarized satellite communication signal) whose frequency has been converted by the converter 6. To a plurality, for example, 4
To the two output terminals 8, 10, 12 and 14. The vertical polarization satellite communication signal and the horizontal polarization satellite communication signal have overlapping frequency bands.

In addition to this, terrestrial broadcasting, for example, UHF
And UH received by the VHF receiving antenna 16
F and VHF television broadcast signals are output to terminals 8 and 1
0, 12, and 14. Further, a satellite broadcast first intermediate frequency signal (hereinafter abbreviated as a satellite broadcast signal) obtained by frequency-converting a radio wave from a broadcast satellite received by the satellite broadcast receiving antenna 18 by a converter 20 attached to the antenna 18 is also provided. , 8, 10, 12, and 14. UHF and VHF television broadcast signals,
The satellite broadcast signals have mutually non-overlapping frequency bands, and both the vertically polarized satellite communication signal and the horizontally polarized satellite communication signal have non-overlapping frequency bands. UHF and VH
The F television broadcast signal and the satellite broadcast signal are non-overlapping signals. The non-overlap signal also includes a CATV signal.

A converter 6 for receiving satellite communication supplies a horizontally polarized satellite communication signal to a satellite communication signal input terminal 22 of the satellite signal switching device 2 and a vertically polarized satellite communication signal to a satellite communication signal input terminal 24. Provides communication signals. The converter 6 operates to output a horizontally polarized satellite communication signal when a DC voltage of, for example, +11 V is supplied to an output terminal of the horizontally polarized satellite communication signal provided therein, and converts the vertically polarized satellite communication signal. When an output signal of, for example, +15 V is supplied to the output terminal, it operates to output a vertically polarized satellite communication signal. When no voltage is supplied to any of the output terminals, this converter 6 does not operate.

A horizontally polarized satellite communication signal supplied to an input terminal 22 is supplied to a mixer 28 via a DC blocking capacitor 26.
The vertical polarization satellite communication signal supplied to the input terminal 24 is supplied to the mixer 32 via the DC blocking capacitor 30.
Is supplied to

The mixers 28 and 32 are supplied with a mixed signal MIX from a non-overlapping signal input terminal, for example, a mixed signal input terminal 34 and DC blocking capacitors 35 and 37. The mixed signal MIX is supplied from the mixer 40.

The mixer 40 has a VH signal received by the UHF and VHF television broadcast receiving antenna 16.
F and UHF television broadcast signals are supplied.
Further, the converter 20 of the satellite broadcast receiving antenna 18
Supplies satellite broadcast signals. Therefore, the mixed signal MIX is a mixture of the satellite broadcast signal and the VHF and UHF television broadcast signals.

The mixed signal is supplied to the mixers 28 and 32 via the input terminal 34 and the DC blocking capacitors 35 and 37. Therefore, the mixed signal MIXH of the mixer 28 is
It is a mixture of a satellite broadcast signal, a VHF and UHF television broadcast signal, and a horizontally polarized satellite communication signal. Similarly, the mixed signal MIXV of the mixer 32 is a signal obtained by mixing a satellite broadcast signal, a VHF and UHF television broadcast signal, and a vertically polarized satellite communication signal.

The mixed signals MIXH and M of the mixers 28 and 32
The IXV is supplied to two quadrants 42 and 44 corresponding to the horizontal polarization satellite communication signal and the vertical satellite communication polarization signal, respectively. The distribution output MIXHD of the four distributor 42 is
Four selection means, for example, changeover switches 46, 48, 5
0 and 52 are supplied to input terminals b. Similarly, the split output MIXVD of the four splitter 44 is set to
48, 50, and 52 are supplied to input terminals a.

These changeover switches 46, 48, 50, 5
2 selects one of the distribution outputs MIXV or MIXH supplied to the input terminals a and b in response to control signals from control means attached to them, for example, determination circuits 46c, 48c, 50c, and 52c. And output.
The outputs of these changeover switches 46, 48, 50, 52 are
It is supplied to output terminals 8, 10, 12, 14 via DC blocking capacitors 54, 56, 58, 60.

Determination circuits 46c, 48c, 50c, 52c
Are connected to corresponding output terminals 8, 10, 12, and 14 via high-frequency blocking coils 70, 72, 74, and 76, respectively.

Each of the determination circuits 46c, 48c, 50c, 52
c determines whether a tone signal described later is supplied from the corresponding output terminal. Judgment circuits 46c, 48
When it is determined that the tone signal is being supplied, c, 50c, and 52c are the corresponding changeover switches 46, 48, 5,
MIXHD including the horizontally polarized satellite communication signal is output from 0 and 52. Similarly, the determination circuits 46c, 48c, 50c,
52c outputs the mixed signal MIXVD including the vertically polarized satellite communication signal from the corresponding changeover switches 46, 48, 50, 52 when it is determined that the tone signal is supplied.

As described above, a vertically or horizontally polarized satellite communication signal can be supplied to a satellite communication receiving tuner according to the presence or absence of a tone signal. Since the satellite broadcast signal and the UHF and VHF television broadcast signals are included in both the distribution outputs MIXVD and MIXHD,
Reception is possible regardless of which distribution output is selected.

The changeover switches 46, 48, 50, 5
As 2, a semiconductor switching element using a PIN diode or the like can be used in addition to one having a mechanical contact.

The operating voltages to the converters 6 and 20 are supplied from respective output terminals 8, 10, 12 and 14. this is,
For example, it is a DC voltage of + 15V. Each output terminal 8, 1
0, 12, and 14 are high frequency blocking coils 70, 72, 7
4, 76, unidirectional elements such as diodes 84, 8
6, 88, 90 are connected to one end of a DC path, for example, DC voltage paths 80, 82. DC voltage path 80
Is connected to the input terminal 22, and the other end of the DC voltage path 82 is connected to the input terminal 24.

The DC voltage path 80 includes a series circuit of a relay contact 92 and a high frequency blocking coil 94. The DC voltage path 82 includes a voltage conversion circuit 96 for converting a voltage of +15 V to a voltage of +11 V, high-frequency blocking coils 98 and 100,
102, a series circuit of relay contacts 104 is included. Another DC voltage path 108 including a high-frequency blocking coil 106 is formed between one end of each of the DC voltage paths 80 and 82 and the input terminal 34. This DC voltage path 108
The input terminal 34 is supplied with a DC voltage of +15 V via the mixer 40 and supplied to the converter 20 via the mixer 40. Therefore, each output terminal 8, 10, 12, 1
4 as long as a voltage of +15 V is supplied to any of
Converter 20 is operating.

The relay contacts 92 and 104 are of the normally open type. The DC voltage path 80 is energized when the relay contact 92 is closed, and supplies the DC voltage of +15 V supplied from any of the output terminals to the converter 6 via the input terminal 22 so that the converter 6 is turned on. Outputs polarized satellite communication signals. The DC voltage path 82 is connected to the relay contact 104
Is closed, the DC voltage of +11 V obtained by converting the DC voltage of +15 V supplied from any of the output terminals by the voltage conversion circuit 96 is supplied to the converter 6 via the input terminal 24, and the converter 6 Outputs a vertically polarized satellite communication signal.

Control of the relay contacts 92 and 104 is performed by switching control means, for example, a tone detection circuit 106. The tone detection circuit 107 is provided with a high frequency blocking coil 1
00, it is determined whether a tone signal is being supplied from any of the output terminals 8, 10, 12, and 14. When it is determined that the tone signal is being supplied, the relay contact 92 is closed and the relay contact 104 And when it is determined that the tone signal is not supplied, the relay contact 92 is opened,
And the relay contact 104 is closed.

As described above, the switching of the relay contacts 92 and 104 and the switching of the changeover switches 46, 48, 50 and 52 are performed based on the presence or absence of a tone signal. This tone signal is supplied to each of the output terminals 8, 10,.
Supplied from 12 and 14. Although FIG. 2 shows a circuit for supplying a superimposed signal of the tone signal and the DC voltage only to the output terminal 14, the same circuit is used for supplying the signal to other output terminals.

This circuit includes an external power supply 110 for generating a DC voltage of + 15V. Further, a CS tuner 112 for receiving vertically and horizontally polarized satellite communication signals.
Is provided, for example, when receiving a horizontally polarized satellite communication signal, the +15 V DC voltage generated at the input terminal of the tuner 112 is supplied to the voltage / tone converter 1.
14 and is superimposed on a +15 V DC voltage from the external power supply 110, and is turned on and off.
It is supplied to an output terminal 116 via a distributor 116. The horizontal and vertical polarization satellite communication signals supplied to the output terminal 14 are supplied to the CS tuner 112 via the two dividers 116 and the voltage / tone converter 114. Similarly, the satellite broadcast intermediate frequency signal supplied to the output terminal 14 is supplied to the BS tuner 118 via the two divider 116.

According to this satellite signal switching device, the DC voltage for operating the converters 6 and 20 is not supplied from the CS tuner 112 or the BS tuner 118 but is supplied from the external power supply 110. Therefore, as shown by the dotted line, between the output side of the mixer 40 and the input terminal 34, between the converter 6 and the input terminal 24, between the converter 6 and the input terminal 22.
Even if a booster is provided between the output terminal 14 and the two-way divider 116, if the capacity of the external power supply 110 is appropriately selected, the booster can be normally operated, and each output The output levels of the terminals 8, 10, 12, and 14 can be set to appropriate levels.

The CS tuner 112 generates a DC voltage of +15 V or +11 V as a switching signal for vertically and horizontally polarized satellite communication signals.
When superimposed on the DC voltage from 10 and supplied to the output terminal, switching between vertically polarized and horizontally polarized satellite communication signals becomes impossible. To avoid this, + 15V or +1
A transmission path for the 1V switching signal must be separately formed. Therefore, this satellite signal switching device solves this problem by converting the +15 V DC voltage from the CS tuner 112 into a tone signal and superimposing it on the +15 V voltage from the external power supply 110 and supplying it to the output terminal. ing.

In this satellite signal switching device, each output terminal 8, 10, 12, 14 is connected to a high-frequency blocking coil 70, 7
2, 74, 76 and diodes 84, 86, 88, 90 connected to the ends of the DC voltage paths 80, 82 via a series circuit.
Is used, it is not necessary to individually form a DC voltage path from each output terminal to each input terminal, and the circuit configuration is simplified.

In the above-described satellite signal switching device 2, the satellite broadcast signal and the UHF and VHF television broadcast signals are mixed with the satellite communication signal.
One or both of the HF television broadcast signals may be removed. Alternatively, a CATV signal can be used instead. Further, in the above satellite signal switching device 2,
The mixed signal MIX from the input terminal 34 is
Mixed with horizontally and vertically polarized satellite communication signals,
The mixed signals MIXH and MIXV are switched by the changeover switch 46,
It was switched at 48, 50 and 52 and supplied to each output terminal.
After selecting one of the horizontally-polarized and vertically-polarized satellite communication signals by the changeover switches 46, 48, 50, and 52, the selected signal and the mixed signal MIX are mixed by a mixer and supplied to each output terminal. You may do so.

[0033]

As described above, according to the present invention, since the DC operating voltage is supplied from a dedicated external power source, for example, a booster for level compensation is provided between the satellite signal input terminal and the converter. Even when the output level of each output terminal is set to an appropriate level, the booster can be operated in a normal state in which a desired level can be obtained. Also, since the DC voltage used for switching the satellite signal is converted to a non-DC signal and supplied to the output terminal, there is no need to separately provide a transmission path for the satellite signal switching signal, and the circuit configuration is reduced. It can be simplified. Also, signals other than satellite signals can be supplied to the output terminal.

[Brief description of the drawings]

FIG. 1 is a block diagram of a signal switching device according to an embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 2 signal switching device 4 satellite communication receiving antenna 6 converter 8 10 12 14 output terminal 22 24 satellite communication signal input terminal 46 48 50 52 changeover switch (selection means) 80 82 DC path

Claims (3)

[Claims] 1. A plurality of input terminals to which a satellite signal at least partially overlapping a plurality of frequencies output from a converter attached to a satellite receiving antenna for receiving satellite radio waves from a geostationary satellite is supplied. An output terminal to which a non-DC control signal obtained by converting a DC voltage from the satellite signal receiver and a superimposed signal obtained by superimposing a DC voltage from an external power supply are supplied; and each of the input terminals; Selecting means formed between the input terminal and the output terminal, for selecting one of the satellite signals in response to the control signal and supplying the selected signal to the output terminal; And a DC path for supplying the DC voltage to a selected one of the input terminals in response to the control signal and supplying the DC voltage to the converter. 2. The satellite signal switching device according to claim 1, wherein a plurality of said output terminals are provided, said selection means is provided between each of said output terminals and each of said input terminals, and each of said output terminals is provided. Are connected to the respective input terminals via a common DC path, and the selection means is controlled by selection means control means provided for each of the selection means, and the common DC path is 1 provided
Satellite signal switching device controlled by two control means. 3. The satellite signal switching device according to claim 1, further comprising a non-overlapping signal input terminal for receiving a non-overlapping signal having a frequency band non-overlapping with the satellite signal. A satellite signal switching device, wherein the non-overlap signal from a terminal is supplied to each of the output terminals, and a DC path is separately formed from each of the output terminals to the non-overlap signal input terminal.