JP2001186038A - Distribution mixer and satellite reception converter and satellite reception system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a satellite reception system where a receiving end can simultaneously receive both BS and CS signals in the case of receiving the BS and CS signals by one antenna. SOLUTION: A CS left-handed circularly polarized wave signal that is frequency-converted by a converter 3 is respectively given to a 1st input section 16a of a distribution mixer section 16 and a CS right-handed circularly polarized wave signal and a BS signal are respectively given to a 2nd input section 16b. A distributor 10 distributes the CS right-handed polarized wave signal and the BS signal given to the 2nd input section 16b, only the BS signal of the distributed signals passes through a low-pass filter 12 and is superimposed on the CS left-handed polarized wave. Then a 1st output section 16c outputs the CS left-handed polarized wave signal and the BS signal and a 2nd output section 16d outputs the CS right-handed polarized wave and the BS signal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a distribution mixer suitable for a satellite reception system that receives both a BS signal and a CS signal, and a satellite reception converter and a satellite reception system using the distribution mixer.

[0002]

2. Description of the Related Art As shown in FIG. 8, the form and frequency band of a BS signal and a CS signal transmitted from a satellite are a right-handed circularly polarized wave of 11.7 GHz to 12.2 GHz and a C signal.
The S signal has left-handed circularly polarized waves (hereinafter referred to as left-handed polarized waves) of 12.25 GHz to 12.73 GHz and 12.27 GHz to 1 GHz.
2.75 GHz right-handed circularly polarized wave (hereinafter referred to as right-handed polarized wave). Conventionally, a BS signal and a CS signal may be received separately by a BS antenna and a CS antenna since both satellites may be separated from each other, and transmitted independently to each home or the like serving as a receiving end using a plurality of cables. Alternatively, by mixing using a block converter, the signal is transmitted to the receiving end by one cable.

[0003]

However, the BS signal and C
Since the right-polarized signal of the S signal is a radio wave of the same form only with a different frequency, if the BS satellite and the CS satellite are located close to each other, or if they are the same satellite,
It is possible to receive with the same probe, ie with the same antenna, so that the number of antennas can be reduced. In addition, the next CS satellite will be the 11
Since launching at 0 ° is also planned, a converter that converts BS and CS to an intermediate frequency in the 1 GHz band (hereinafter referred to as “IF band”) when receiving BS and CS with one antenna,
Conventionally, it is possible to reduce the number of antennas required for both the BS antenna and the CS antenna to one, so that an inexpensive receiving system can be formed and the aesthetic appearance of the town is also favorable. However, in this case, of the two probes for receiving the CS left polarization and the CS right polarization, the BS signal is also received by the probe for receiving the CS right polarization, and the CS left polarization signal and the CS right polarization are received. And the BS signal are transmitted to the receiving end via a separate cable.

[0004] However, when the satellite signal thus received and transmitted is received at home, the tuner switches between CS left polarization and CS right polarization and receives the signal. If you want to receive both at the same time, C
When receiving S right polarization, BS can be received, but CS
When receiving left-polarized waves, a situation occurs in which BS cannot be received.

[0005] Therefore, the present invention provides a BS with one antenna.
It is an object of the present invention to provide a distribution mixer, a satellite reception converter, and a satellite reception system that can simultaneously receive both the BS and the CS at the receiving end when receiving the CS and the CS.

[0006]

To achieve the above object, according to the first aspect of the present invention, a first input section to which a CS left-handed circularly polarized signal is input, and a CS right-handed circularly polarized signal and a BS signal are provided. A second input unit for inputting, a distributor for distributing the CS right-handed circular polarization signal and the BS signal input to the second input unit, and the CS left-handed circular polarization input to the first input unit A mixing unit for superimposing only one of the BS signals distributed by the distribution unit on the wave signal; a first output unit for outputting the CS left-hand circularly polarized signal and the BS signal superimposed by the mixing unit; And a second output unit that outputs the CS right-handed circularly polarized signal and the BS signal distributed to the other unit. The invention according to claim 2 provides, in addition to the object of claim 1, a polarization signal input from the receiving end side so that a terminal device such as a CS tuner that outputs a polarization signal switching signal can be used as it is. According to the wave switching signal, the CS left-handed circularly polarized signal and the BS signal, and the CS right-handed circularly polarized signal and the BS
A polarization switching means capable of selecting and outputting either one of the signals is provided.

According to a third aspect of the present invention, a first input section to which a CS left-hand circularly polarized signal is inputted, and a CS right-handed polarized signal and a BS signal are inputted. A second input unit; a first distribution unit that distributes the CS left-handed circularly polarized signal input from the first input unit into a plurality;
The CS right-handed circularly polarized signal and BS input from the input unit
A second distributor for distributing the signal into a plurality of signals, and selecting one of the distribution terminal of the first distributor and the distribution terminal of the second distributor in accordance with a polarization switching signal input from a receiving end. A polarization switching unit capable of outputting the same, and a CS selected by the polarization switching unit.
A mixing unit that superimposes only a BS signal from a distribution end of the second distribution unit on the polarization signal, bypassing the polarization switching unit;
According to another aspect of the present invention, there is provided a distribution mixer including an output unit that outputs a CS polarization signal and a BS signal superimposed by the mixing unit.

In order to achieve the above object, a fourth aspect of the present invention includes the distribution mixer according to any one of the first to third aspects, and converts the CS left-hand circularly polarized signal after frequency conversion into the above-mentioned signal. This is a satellite reception converter in which a CS right-handed circularly polarized signal and a BS signal after frequency conversion are input to a second input unit of the distribution mixer, respectively, at a first input unit of the distribution mixer.
In order to achieve the above object, the invention described in claim 5 is:
Two signal transmission lines are formed between one antenna and a receiving end, and a CS left-handed circularly polarized signal is transmitted on one signal transmission line, and a CS right-handed circularly polarized signal and BS signal are transmitted on the other signal transmission line. A satellite receiving system for transmitting each signal, wherein the distribution mixer according to any one of claims 1 to 3 is provided in the middle of the signal transmission path, and the one signal transmission path is connected to a first input section of the distribution mixer. The other signal transmission line is connected to the second of the distribution mixers.
This is a satellite receiving system which is connected to the input unit.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a block diagram showing the configuration of an antenna and a receiving end, wherein 1 is a primary radiator of the antenna, 2 is a probe, 3 is a satellite receiving converter (hereinafter referred to as "converter"), and 4 is provided at the receiving end. A polarization switching device as polarization switching means. This converter 3 (converter 2 of a modification example described later)
2), and the polarization switch 4 is formed by, for example, aluminum die casting.

The probe 2 comprises a left-polarization receiving probe 2a and a right-polarization receiving probe 2b. The left-polarization receiving probe 2a receives a CS left-polarized signal, and the right-polarization receiving probe 2b. Receives the CS right-polarized signal and the BS signal. Then, the signals of both probes are input to the converter 3. Here, a phase difference plate 1a is interposed in the waveguide to convert a circularly polarized wave into a linearly polarized wave.
Is configured to receive. However, by inserting a circular polarization converter using a hybrid circuit (not shown) between the probe 2 and an amplifier 9 described later instead of the phase difference plate 1a, the orthogonal components of right and left-handed polarizations are synthesized. , And can also be demultiplexed. In this case, the circuit of the converter 3 and the hybrid circuit are formed on the same substrate.

The converter 3 has two input units, an input unit 5
a, 5b, and the signals from the two probes 2a, 2b are input respectively, and the frequency is converted to the IF band by the converter unit 7 having one local oscillator 6. The left-polarized signal, which is amplified by the amplifier 9 before and after the conversion, but is input from the input unit 5a and frequency-converted, is input to the first input unit 16a of the distribution mixer 16 as a distribution mixer,
The right-polarized signal and the BS signal input from the input unit 5b and frequency-converted are input to the second input unit 16b of the distribution / mixing unit 16. The right-polarized signal and the BS signal input from the second input unit 16b are split by the splitter 10, and one of the split signals is mixed with the left-polarized signal input from the first input unit 16a. Here, before the mixing, the low-pass filter 12 that cuts off the CS right-polarized wave and passes only the BS signal is provided. The output is output from the output unit 8a of the converter 3 via the first output unit 16c. The other CS right-polarized signal and the BS signal distributed by the distributor 10 are output from the output unit 8 b of the converter 3 via the second output unit 16 d of the distribution mixing unit 16. Reference numeral 11 denotes a high-pass filter for passing the CS left-polarized signal converted into the IF band and preventing the BS signal passed through the low-pass filter 12 from flowing to the amplifier 9.

The two output units 8 of the converter 3
a and 8b are connected to coaxial cables 13a and 13b,
It is pulled into the receiving end. At the receiving end, two 4-dividers 14
A polarization switching device 4 is provided which combines the reception signal with four households or four rooms, and two reception cables 1 at each reception end.
3a and 13b can be switched. Reference numeral 17 denotes a power supply unit of the converter 3 and the polarization switching unit 4. Reference numeral 18 denotes a switching unit provided with a voltage determination circuit, a relay coil, and the like. The switching signal supplied from the receiving end switches between DC 11V and DC 15V. Then, the switch 18 is switched between energization and non-energization of the relay coil, and the changeover switch 15 is selected. Here, CS right-polarized wave at DC 11V, CS at 15V DC
The left polarization is selected respectively. On the other hand, at each receiving end, a well-known BS / CS terminal device such as a television receiver 19, a BS receiving VTR 20, and a CS tuner 21 is provided (in FIG. 1, only one receiving end is shown and the other is omitted. ), C
The S tuner 21 outputs a voltage signal of DC 11 V or 15 V serving as a switching signal of power supply and left polarization or right polarization to the polarization switch 4 side.

As described above, according to the above-mentioned satellite receiving system, since the distribution / mixing unit 16 is built in the converter 3, the two output units 8a and 8b of the converter 3 both have the BS.
Since the signal is output, even if the receiving end switches to either CS left polarization or CS right polarization, the BS signal can be received in parallel, and the BS signal is cut off by switching. There is no. In particular, here, since the distribution mixer is built in the converter, the rational configuration can be easily applied to the existing satellite receiving system. Further, a power supply unit 17 and a switching unit 18 are provided in the polarization switching unit 4, and the switching switch 15 is used to switch a switching signal (DC 11V and 1
Since the switching is automatically performed according to the potential difference from 5 V), the polarization switching function of the conventional CS tuner 21 can be used without being changed.

In the above-described embodiment, the distribution / mixing unit 16 is incorporated in the converter 3. However, if the distribution / mixing unit 16 is in the middle of two signal transmission paths, as shown in FIG. It may be built-in, and the distribution mixing section and the polarization switching means may be integrated. In this case, as in the case of FIG.
Regardless of which of the left and right polarizations is selected, BS signals can be received in parallel, and can be easily applied to existing satellite reception systems.

FIG. 3 is a block diagram of an antenna according to another embodiment of the present invention. The converter 22 has two converters at positions corresponding to the two output sections 8a and 8b of the converter 3 in the above embodiment. The two distributors 23, 23, the two changeover switches 24, 24, the power supply unit 17, and the switch 1
And a polarization switching unit 25 comprising
And the CS left-polarized signal output from the first output unit 16c
The S signal is distributed by one of the two dividers 23, and the CS right polarization signal and the BS signal output from the second output unit 16d are respectively distributed by the other two divider 23. Note that the same reference numerals as those in FIG. 1 denote the same components, and a duplicate description will be omitted. Therefore, in this embodiment, the switch 18 operates the changeover switch 24 in response to the changeover signal from the CS tuner 21 so that the CS left polarization signal and the BS signal distributed by the two divider and the CS right polarization One of the signal and the BS signal can be selected and output from the output units 21a and 21b, respectively.

As described above, according to the embodiment shown in FIG. 3, since the polarization switch 25 is built in the converter 22,
BS, C in two households or two rooms with one antenna
An S signal can be transmitted, and each receiving end can receive a BS signal in parallel regardless of the selection of the CS reception wave. Of course, the effects of simple application to an existing satellite receiving system by incorporating the distributing / mixing unit 16 and securing the versatility of the conventional CS tuner 21 by employing the power supply unit 17 and the switching unit 18 are described in FIG. It can be expected as in the second embodiment.

In the embodiments shown in FIGS. 1 and 2, the number of polarization switches provided at the receiving end is divided into four. However, depending on the situation, the number may be smaller or more. Further, even in the embodiment shown in FIG. 3, the number of polarization switches provided in the converter may be further increased. Further, it is preferable that the distribution mixer is built in the converter or the polarization switching device as in each of the above embodiments, so that the configuration can be rationalized. However, the distribution mixer is formed independently, and this is used for signal transmission of the satellite reception system. It is possible to incorporate them in the middle of the road.

On the other hand, in the embodiments shown in FIGS. 2 and 3, the distribution mixer and the polarization switching means are formed functionally separately, but they can be integrated. FIG. 4 shows a modification thereof. In the distribution mixer 26 of the converter 22, first, like the polarization switch 25 described with reference to FIG. By 23
The CS left polarization signal input from the first input unit 26a, and the CS right polarization signal and BS input from the second input unit 26b
Signals, respectively, and also causes the switch 18 to select the changeover switch 24 in response to a changeover signal from the receiving end. However, in this case, since the BS signal cannot be received when the CS left polarized signal is selected, the high-pass filters 27 are respectively provided at the subsequent stage of the changeover switch 24, and the CS right polarized signal and the BS signal are distributed. The low-pass filter 2 is connected between the distribution end on the side of the second input section 26 b (before the changeover switch 24) and the subsequent stage of the high-pass filter 27.
8 are connected respectively. Other configurations are the same as those in FIG.

Therefore, according to the modification of FIG. 4, when the CS left polarization is selected, the C input from the first input unit 26a is input.
After being split into two, the S left polarized signal passes through the changeover switch 24 and the high-pass filter 27, while the second input unit 2
6b, the CS right-polarized signal and the BS signal are 2
After being distributed, only the BS signal passes through the low-pass filter 28. Therefore, the CS left polarization signal and the BS signal are output from the first output unit 26c and the output unit 21a. On the other hand, when the CS right polarization is selected, only the CS right polarization signal and the BS signal input from the second input unit 26b are split into two, and only the CS right polarization signal is Since only the BS signal passes through the band-pass filter 28, the CS right-polarized signal and the BS signal are output from the first output unit 26c and the output unit 21a. Therefore, also in this case, the BS signal can be received in parallel regardless of the switching of the CS polarization. In particular, in this modified example,
Since the BS signal can be continuously received without an instantaneous interruption due to the operation of the changeover switch 24 accompanying the switching of the CS polarization, a stable image can be obtained.

In the modification shown in FIG. 4, the CS polarization switching switch 18 and the changeover switch 24 are replaced by a switch shown in FIG.
As shown in (1), a hybrid switch 29 (for example, a DBS twin IF switch (μPG181GR) manufactured by NEC Corporation) that switches the output according to the switching of the control voltage from the voltage switching unit 30 can be used. That is, when the CS left polarization is selected, the first input unit 26
The CS left-polarized signal on the a-side and the CS right-polarized signal and the BS signal on the second input section 26b are used as they are in the hybrid switch 2.
Pass 9 Therefore, the BS signal extracted by the low-pass filter 28 is mixed with the CS left-polarized signal and output.
On the other hand, when the CS right polarization is selected, the hybrid switch 29 cuts the CS left polarization signal, splits the CS right polarization signal and the BS signal into two, and outputs each. Therefore, the CS right-polarized signal that has passed through the high-pass filter 27 and the BS signal that has passed through the low-pass filter 28 are mixed and output. As described above, even when the hybrid switch 29 is used, the same operation and effect as those in FIG. 4 can be obtained.

The distribution mixer integrated with the polarization switching means as shown in FIGS. 4 and 5 is not limited to the one provided in the converter, but a signal transmission line external to the converter as shown in FIG. May be provided. Further, in each of the above embodiments, the two output units of the distribution mixer are configured to always transmit the BS signal. However, if it is sufficient that only one of the BS units can receive the BS signal in parallel by the receiving end, FIG. In this way, the high-pass filter 27 and the low-pass filter 28 on the one side of the changeover switch 24 shown in FIG. 4 are eliminated, or the one hybrid switch 29 shown in FIG. In addition to the switch 24, design changes such as eliminating the high-pass filter 27 and the low-pass filter 28 on the changeover switch 24 side are possible. Note that the changeover switch 24 in FIG. 7 may be a hybrid switch 29.

[0022]

As described above in detail, according to the distribution mixer of the first aspect, since the first and second output units output the BS signal, the receiving end receives the CS left polarization or the CS signal.
Even if the signal is switched to any one of the right-polarized waves, the BS signal can be received in parallel, and the switching does not interrupt the BS signal. According to the distribution mixer of the second aspect, in addition to the effect of the first aspect, the CS left-hand circularly polarized signal and the BS signal, and the CS right-handed circular signal are used in accordance with the polarization switching signal input from the receiving end. By providing the polarization switching means capable of selecting and outputting either the polarization signal or the BS signal, a terminal device such as a CS tuner that outputs a polarization signal switching signal can be used as it is. According to the distribution mixer according to the third aspect, similarly to the second aspect, the selected CS polarization signal and the BS signal can be received.
Since the BS signal can be continuously received without interruption due to the operation of the polarization switching unit, a stable image can be obtained.

According to a fourth aspect of the present invention, there is provided a satellite reception converter including the distribution mixer according to any one of the first to third aspects, and transmitting the CS left-hand circularly polarized signal after frequency conversion to the distribution mixer. , The CS right-handed circularly-polarized signal and the BS signal after frequency conversion are input to the second input unit of the distribution mixer, respectively. Switching to any of the right-polarized waves and receiving
The BS signal can be received in parallel, and the switching does not interrupt the BS signal. In addition, a reasonable configuration can be easily applied to the existing satellite receiving system. According to the satellite receiving system of the fifth aspect, the distribution mixer according to any one of the first to third aspects is provided in the middle of the signal transmission path, and one of the signal transmission paths is connected to the first input section of the distribution mixer. To
By connecting the other signal transmission path to the second input section of the distribution mixer respectively, even if the receiving end switches to either CS left polarization or CS right polarization and receives, the BS signal is transmitted in parallel. The signal can be received, and the switching does not interrupt the BS signal.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a satellite reception system.

FIG. 2 is a block diagram showing another embodiment of the satellite receiving system.

FIG. 3 is a block diagram showing another embodiment of the satellite receiving system.

FIG. 4 is a block diagram showing another embodiment of the satellite receiving system.

FIG. 5 is a block diagram showing another embodiment of the satellite receiving system.

FIG. 6 is a block diagram showing another embodiment of the satellite receiving system.

FIG. 7 is a block diagram showing another embodiment of the satellite receiving system.

FIG. 8 is a frequency spectrum showing each radio wave form and frequency band of BS and CS.

[Explanation of symbols]

2, 2a, 2b reception probe, 3, 22 satellite reception converter, 4, 25 polarization switcher, 7 converter part, 10 distributor, 11, 27 high pass Filters, 12, 28 ... low-pass filters, 16, 26
..Distribution mixers, 16a, 26a.
b, 26b second input section, 16c, 26c first output section, 16d, 26d second output section, 17 power supply section 18, switcher, 15, 24 switch, 2
9. Hybrid switch.

Continued on the front page F term (reference) 5C025 AA10 AA22 DA04 5C064 DA02 DA07 DA08 5K062 AA00 AA09 AB11 AB13 AE01 AE03 AE04 AE05 BA00 BA02 BC02 BC04

Claims (5)

[Claims] 1. A first input for receiving a CS left-handed circularly polarized signal, a second input for receiving a CS right-handed circularly polarized signal and a BS signal, and a second input for receiving the CS left-handed circularly polarized signal and the BS signal. A distributor for distributing the CS right-handed circularly polarized signal and the BS signal, and superimposing only one of the BS signals distributed by the distributor on the CS left-handed circularly polarized signal input to the first input unit; A mixing unit, a first output unit that outputs the CS left-hand circularly polarized signal and the BS signal superimposed by the mixing unit, and the CS right-handed circularly polarized signal and the BS signal distributed to the other unit by the distribution unit And a second output unit for outputting a signal. 2. According to the polarization switching signal input from the receiving end, any one of a CS left-handed circularly polarized signal and a BS signal and a CS right-handed circularly polarized signal and a BS signal can be selected and output. 2. The distribution mixer according to claim 1, further comprising a polarization switching means. 3. A first input unit to which a CS left-handed circularly polarized signal is input, a second input unit to which a CS right-handed circularly polarized signal and a BS signal are inputted, and an input from the first input unit. The CS
A first distributor for distributing the left-handed circularly polarized signal into a plurality of signals, and the CS right-handed circularly polarized signal and B input from the second input unit.
A second distributing unit for distributing the S signal into a plurality of components, and selecting one of the distributing end of the first distributing unit and the distributing end of the second distributing unit according to a polarization switching signal input from a receiving end side And a polarization switching unit capable of outputting the C and the C selected by the polarization switching unit.
The second S-polarized signal is bypassed to the second
A distribution mixer comprising: a mixing unit that superimposes only the BS signal from the distribution end of the distribution unit; and an output unit that outputs the CS polarization signal and the BS signal superimposed by the mixing unit. 4. The frequency-converted CS left-handed circularly polarized signal, which incorporates the distribution mixer according to claim 1 and is supplied to a first input unit of the distribution mixer. A satellite receiving converter for inputting a right-handed circularly polarized signal and a BS signal to a second input of the distribution mixer. 5. Two signal transmission lines are formed between one antenna and a receiving end, and a CS left-handed circularly polarized signal is transmitted on one signal transmission line and a CS right-handed circularly polarized signal is transmitted on the other signal transmission line. A satellite receiving system for transmitting a signal and a BS signal, respectively, wherein the distribution mixer according to any one of claims 1 to 3 is provided in the middle of the signal transmission line, and the one signal transmission line is connected to the distribution mixer. A satellite receiving system, wherein the other signal transmission line is connected to a first input unit of the distribution mixer and to a second input unit of the distribution mixer.