JP3947031B2 - Satellite signal reception transmission system and switching distributor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a satellite signal receiving transmission system that receives satellite signals of both BS and CS with the same antenna and transmits them indoors with a single signal cable, and a switching distributor suitable for the system.
[0002]
[Prior art]
When both BS and CS satellites are arranged close to each other, or when transmitting by the same satellite, both radio waves can be received by one antenna. In this case, when both received signals are transmitted indoors from the antenna with one signal cable, the BS signal and CS signal transmitted from the satellite are as shown in the frequency spectrum of FIG. The frequency arrangement, that is, the BS signal is a right polarization signal of 11.7 GHz to 12.2 GHz, the CS signal is a left polarization signal of 12.25 to 12.75 GHz, and a right polarization signal of 12.27 to 12.75 GHz. In the CS signal, the right polarization and the left polarization overlap on the frequency axis, so that the right polarization signal and the left polarization signal of the CS signal are separated on the frequency axis and do not overlap the BS signal. It must be transmitted on the frequency axis.
[0003]
As a satellite signal receiving and transmitting system that receives such satellite signals of both BS and CS with one antenna and transmits them to the receiving end with one cable, the present inventors have described in Japanese Patent Laid-Open No. 2001-186037. We proposed a configuration to do this. This is configured, for example, as shown in the block diagram of FIG. In FIG. 7, 31 is a satellite signal receiving antenna, 32a and 32b are converter units, 33 is a VHF antenna, 34 is a UHF antenna, 35 is a down converter, and the satellite signal receiving antenna 31 is received by two converter units 32a and 32b. The satellite signal is IF-converted for each left and right polarization, so that the CS left and right polarization signal and the BS signal can be transmitted with one cable so as not to overlap on the frequency axis.
[0004]
The UHF and VHF terrestrial waves were further mixed, and all received signals were arranged as shown in the frequency spectrum of FIG. 6 and drawn indoors with a single cable.
The indoor receiving end is provided with a down converter 35 that down-converts the CS left polarization signal so that all CS signals can be received by a commercially available CS tuner 36. All signals can be received. Reference numeral 36 denotes a CS tuner, and 37 denotes a television receiver.
[0005]
[Problems to be solved by the invention]
However, although the conventional satellite signal receiving and transmitting system described above can draw all received radio waves indoors with a single cable, it uses a conventional CS tuner 36 that is commercially available in each room serving as a receiving end. In order to receive all CS signals, a down converter 35 is required for each CS tuner 36, and the CS tuner receiving equipment is expensive, and the wiring at the receiving end becomes complicated, which is a troublesome work. It was.
[0006]
Therefore, in view of the above problems, the present invention provides a satellite signal receiving transmission system capable of receiving CS signals in addition to terrestrial waves and BSs with simple wiring without providing a down converter at the receiving end, and a switching distributor suitable for the system. The purpose is to provide.
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, a switching distributor according to the invention of claim 1 includes a single input terminal for inputting a BS signal and a CS signal separated by increasing the transmission frequency of the CS signal from the BS signal, and the input terminal. A first distributor that distributes the BS and CS signals input from the first distributor, a second distributor that distributes at least two satellite signals distributed by the first distributor, and the first distributor. A down-converter for down-converting one CS polarized wave arranged in a higher frequency band of the left and right polarized waves of the CS signal among the other distributed satellite signals so as to substantially match the frequency band of the other CS polarized wave; A pair of a third distributor that distributes the output of the down-converter unit in the same number as the second distributor, and an output of the third distributor and an output of the second distributor. Output off to select only one of the signals And a plurality of output terminals for outputting a signal selected by the output switching means. When the output switching means operates with a voltage input from the output terminal and the voltage is 0V The switching operation is performed so as to select the second distributor output, and the third distributor output is selected at a voltage of approximately 11 V, and the second distributor output is selected at a voltage of approximately 15 V. It is characterized by that.
[0008]
The invention of claim 2 is characterized in that, in the invention of claim 1, the down-converter section has a bypass circuit for always outputting the inputted BS signal.
[0010]
A satellite signal reception and transmission system according to a third aspect of the invention receives a BS signal, a CS left polarization signal, and a CS right polarization signal by a common receiving unit, and separates the BS and CS left and right polarization signals on the frequency axis. a satellite signal receiving antenna for and outputting retraction indoors by transmitting a signal output from the satellite signal receiving antenna in one signal cable, to claim 1 or 2 distributes the satellite signal transmitted by the signal cable And a television terminal installed in each room and connected to an output terminal of the switching distributor via a signal cable.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, embodiments of the invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing an example of a switching distributor and a satellite signal reception transmission system according to the present invention, and shows a case of a joint reception facility such as an apartment house. 1 is a satellite signal receiving antenna that receives both BS and CS satellite signals, 2 is a VHF antenna, 3 is a UHF antenna, 4 is a switching distributor, and 8 is a CS tuner connected to a television terminal 11 that is a receiving end. , 9 indicates a television receiver.
[0012]
The satellite signal receiving antenna 1 has two reception probes, a probe for receiving left polarization and a probe for receiving right polarization, and the received BS and CS signals are converted into a left polarization signal by two converter units 1a and 1b. And the right polarization signal are independently IF-converted, and the received frequencies of BS and CS shown in FIG. 5A are IF-converted into the frequency spectrum of FIG. 5B by the converter units 1a and 1b.
The IF-converted received signal is mixed by the mixer 5 and transmitted by the signal cable 7a which is a single coaxial cable.
The BS and CS satellite reception signals mixed by the mixer 5 are further mixed and amplified by a booster 6 having a mixing function together with terrestrial signals of both VHF and UHF, and are amplified by one signal cable 7b. It is transmitted indoors with the frequency arrangement shown in the frequency spectrum.
[0013]
The signal cable 7b drawn indoors is branched by the branching devices 10, 10,... According to the number of houses, and transmitted to each dwelling unit using one signal cable. A switching distributor 4 is provided in the drawing-in portion of each dwelling unit, and the transmitted signal is distributed by the switching distributor 4 according to the number of rooms or the number of TV terminals, for example, four, and the distribution output is Each TV terminal 11 is connected with one signal cable.
[0014]
The switching distributor 4 has one input terminal 19 and four output terminals 20, 20..., The two distributors 12 as the first distributor, the downconverter unit 13, and the second distributor as 4 distributors 14, 4 distributors 15 as third distributors, and four output switching means 16 provided at each output terminal, and one of the input signals distributed by the 2 distributors 12 is divided into 4 parts. The output switching unit 16 is connected to the first output port P1, the other divided into two is connected to the downconverter unit 13, the output is divided into four and connected to the second output port P2 of the output switching unit 16.
[0015]
The output switching means 16 is configured as shown in the block diagram of FIG. 2A, where 16a is a changeover switch, 16b is a power supply separation filter, and 16c is a control unit. Each control unit 16c performs a switching operation shown in the table of FIG. 2B by a DC or low-frequency voltage signal sent via a cable from the CS tuner 8 connected to the TV terminal 11 which is a receiving end. . That is, if the voltage signal from the CS tuner 8 is 9V or less or 13.5V or more, the first output port P1 is selected, and the signal of the first output port P1 is output from the output terminal 20. If it exceeds 9V and less than 13.5V, the second output port P2 is selected, and the signal of the second output port P2 is output from the output terminal 20.
[0016]
Further, the down converter unit 13 is configured as shown in FIG. 3, and includes one low-pass filter 18a, first and second two high-pass filters 18b and 18c, and a down converter circuit 13a. The low-pass filter 18a is provided between the input and output of the down-converter unit 13, has a characteristic indicated by F1 in FIG. 5B, and forms a bypass circuit 21 that cuts and outputs the CS signal.
The first high-pass filter 18b has a characteristic indicated by F2 in FIG. 5B, and the down-converter circuit 13 down-converts the CS left polarization signal into a substantially CS right polarization frequency band, and FIG. ), Only the CS left-polarized wave that has been down-converted through the second high-pass filter 18c having the characteristic indicated by F3 is output.
In this way, the down-converter unit 13 outputs the CS left polarization signal and BS signal shown in the frequency spectrum of FIG. 5D, and further a terrestrial signal (not shown).
[0017]
By configuring the switching distributor 4 in this manner, the input signal is output without being processed from the first output port P1, and the CS that is down-converted so as to be received by the CS tuner from the second output port P2. A left polarization signal and a BS signal are output.
Therefore, if the CS tuner is connected to the TV terminal which is the receiving end, the CS right polarization signal can be received if the output switching means selects the first output port P1, and the second output port P2 is selected. Then, the CS left polarization signal can be received. This switching can be performed by changing the voltage applied to the television terminal by the switching means provided in the CS tuner. Further, the BS signal or the terrestrial signal can always be received regardless of which output port the output switching means selects.
[0018]
Therefore, as shown in FIG. 1, if a conventional CS tuner is connected to the TV terminal of each household by simply installing a switching distributor at the cable inlet of each household, the CS right polarization and CS will be provided without providing a down converter. A left polarization signal can be received, and a BS signal and a terrestrial signal can be received at the same time, and the receiving end equipment can be configured at low cost. In addition, connection of devices at the receiving end does not become complicated.
Furthermore, even if the voltage input from the output terminal is 0V, the output switching means will not be in an open state, so even if the CS tuner or the like that switches the output switching means is powered off, it receives terrestrial and BS signals. can do.
[0019]
FIG. 4 shows another example of the satellite signal reception and transmission system according to the present invention, in which the satellite reception signals of BS and CS are mixed with the cable television signal and pulled in with one signal cable. In FIG. 4, 22 is a cable television network, 23 is a protector, 24 is a bidirectional booster, and the same components as those in FIG.
In this way, even if it is connected to a CATV network having the same signal frequency band as that of the terrestrial wave, mixed and drawn in with one signal cable, a switching distributor is provided near the inlet as in FIG. If a CS tuner is connected to the TV terminal of each room, the CS left polarization can be received together with the CS right polarization.
[0020]
In any of the above embodiments, the distribution number of the switching distributor is four, but the distribution number is determined according to the number of connected television terminals. However, since the amount of signal attenuation increases as the number of distributions increases, about 4 distributions are preferable. Moreover, although the switching distributor is provided with respect to each dwelling unit, you may provide one switching distributor with respect to several dwelling units, and when there are many distributions, a plurality of switching dividers are installed in a dwelling unit. May be installed.
In addition, the CS left polarization is IF converted to the highest frequency. However, this is not limited to this frequency arrangement, and the CS right polarization is IF converted to the highest frequency and indoors using a single signal cable. In this case, the down converter unit down-converts the CS right polarization signal.
[0021]
【The invention's effect】
As described above in detail, according to the switching distributor according to the first aspect of the present invention, even when the BS signal and the CS signal are transmitted through one signal cable, the output switching means is switched to perform the conventional operation. The CS tuner can receive both CS right polarization and CS left polarization.
Further, even when the voltage is 0 V, the output switching means is not opened, so that the ground or BS signal can be received even if the CS tuner for switching the output switching means is not powered off or connected.
[0022]
According to the invention of claim 2, in addition to the effect of claim 1, the BS signal can be always received regardless of the operation of the output switching means.
[0023]
According to the satellite signal receiving and transmitting system of the third aspect of the invention, the CS signal drawn in with one cable together with the BS signal is distributed to the television terminals of the individual rooms via the switching distributor provided with the downverter. Therefore, it is possible to receive the CS left polarization signal together with the CS right polarization signal only by using a commercially available CS tuner without providing a down converter at each TV terminal, and the receiving end equipment can be configured at low cost. In addition, connection of devices at the receiving end does not become complicated.
[Brief description of the drawings]
FIG. 1 is a block diagram of a satellite signal receiving and transmitting system showing an example of an embodiment of the present invention.
2A and 2B are explanatory diagrams of an output switching unit of the switching distributor of FIG. 1, in which FIG. 2A is a block diagram, and FIG. 2B shows a relationship between an input voltage and a switching operation of the output switching unit.
FIG. 3 is a block diagram showing a configuration of a down converter unit in the switching distributor of FIG. 1;
FIG. 4 is a block diagram showing another example of the satellite signal receiving and transmitting system of the present invention.
5A and 5B show changes in the frequency of a received satellite signal, where FIG. 5A shows a frequency spectrum received by the antenna, FIG. 5B shows a frequency spectrum transmitted from the antenna to the indoors, and FIG. 5C passes a down converter in the distributor. The frequency spectrum of the signal, (d) is the output signal spectrum including the BS signal.
FIG. 6 is a reception frequency spectrum transmitted by a cable drawn indoors.
FIG. 7 is a block diagram of a conventional satellite signal receiving and transmitting system.
[Explanation of symbols]
1 ··· Satellite signal receiving antenna, 4 ··· Switching distributor, 7a, 7b · · Signal cable, 8 · · CS tuner, 11 · · TV terminal, 12 · · 2 distributors as the first distributor, 13 .. Down converter section, 13a .. Down converter circuit, 14 .. 4 distributor as second distributor, 15 .. 4 distributor as third distributor, 16 .. Output switching means, 19.・ Input terminal, 20 ・ ・ Output terminal, 21 ・ ・ Bypass circuit.

Claims (3)

One input terminal for inputting a BS signal and a CS signal separated by increasing the transmission frequency of the CS signal from the BS signal, a first distributor for distributing the BS and CS signals input from the input terminal into two, A second distributor that distributes at least two satellite signals distributed by the first distributor, and a higher frequency of left and right polarizations of the CS signal among the other satellite signals distributed by the first distributor A down-converter unit that down-converts one CS polarized wave arranged in the band so as to substantially match the frequency band of the other CS polarized wave, and a second converter that distributes the output of the down-converter unit in the same number as the second distributor. And an output switching means for selecting only one of the signals by forming a pair with the output of the third distributor and the outputs of the third distributor and the outputs of the second distributor; Multiple outputs to output selected signals Has a child, the,
The output switching means operates with a voltage input from the output terminal. When the voltage is 0V, the output switching means performs a switching operation so as to select the second distributor output, and the third distribution with a voltage of approximately 11V. The switching distributor performs switching operation so as to select each of the second distributor outputs with a voltage of approximately 15V .   The switching distributor according to claim 1, wherein the down-converter unit includes a bypass circuit that constantly outputs the input BS signal. A satellite signal receiving antenna that receives a BS signal, a CS left polarization signal, and a CS right polarization signal at a common receiving unit, and separates and outputs the BS and CS left and right polarization signals on the frequency axis, and the satellite signal reception 3. A switching distributor according to claim 1 or 2 , wherein a signal output from an antenna is transmitted through a single signal cable, is drawn indoors, and a satellite signal transmitted through the signal cable is distributed. A satellite signal reception and transmission system comprising: a television terminal connected to an output terminal of the switching distributor via a signal cable.

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