JP3415526B2 - Satellite receiving system and booster device and power supply device used in the system - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to two different polarization planes.
The present invention relates to a satellite receiving system that receives a satellite signal of a type and transmits either one of the signals to a receiving end with a single coaxial cable, and more particularly, to a switching system that reliably switches the transmission signal.

[0002]

2. Description of the Related Art Radio waves transmitted from a communication satellite (hereinafter referred to as CS) consist of two types, left-hand circular polarization and right-hand circular polarization, and a CS antenna that receives this radio wave can receive both radio waves. Has become. These two types of radio waves have a left-handed circularly polarized wave of 12.25 GHz to 12.73 GHz and a right-handed circularly polarized wave of 12.27 GHz to 12.75 GHz, and the signals received by the CS antenna because the frequency bands overlap. When transmitting a signal to the receiving end, two types of received radio waves can be transmitted at the same time by transmitting signals individually using two coaxial cables (hereinafter simply referred to as cables).
When mixed types of radio waves are transmitted by one cable, they cannot be separated at the receiving end and cannot be transmitted by one cable at the same time.

Therefore, when transmitting with one cable, there is a method of converting the frequency of one radio wave so that it does not overlap with the other, or transmitting only one of the signals, but in the former, the system is expensive. Therefore, the latter is widely adopted. In this case, a polarization switching system in which a transmission signal from the CS antenna is switched by a switching signal from the receiving end and only one of the polarization signals is transmitted is widely adopted. Then, this switching is usually performed by a CS tuner installed at the receiving end, and is performed by switching the operation of the IF conversion converter corresponding to each polarization provided in the CS antenna, and the switching operation is a signal. Switching is performed by switching the DC voltage supplied from the converter operating power supply unit built into the CS tuner via the cable that is the transmission path to, for example, 11V / 15V, and the converter detects the voltage difference and switches the operating converter. ,
Either one of the two types of received radio waves was IF converted and output.

By the way, when the transmission path from the CS antenna to the receiving end is long, or when a distributor or the like is used to distribute a large number of received signals, the amount of attenuation of the transmitted signals becomes large and the receiving end has a large amount of attenuation. Since it is difficult to obtain good reception characteristics, it is common to interpose a booster (amplifier) in the middle of the transmission path. When configured in this way, a polarization switching type satellite receiving system is disclosed in Japanese Patent Laid-Open No.
The technology disclosed in Japanese Patent Publication No. 257410 is known,
Both the booster and the power supply device of the booster provided between the booster and the terminal device are provided with through circuits for the converter operating voltage signal sent from the CS tuner, so that the operating voltage signal from the CS tuner is not changed. I was sending it to the converter.

[0005]

However, since a distributor, a branching device, and the like used in such a receiving system must pass the voltage signal from the CS tuner, any distributor terminal or a branching device may be used. All terminals that allow the operating voltage to pass through even from terminals are used.
In each of these, a diode element for preventing current backflow is provided at each branch or distribution terminal, which causes a voltage drop. Therefore, even if a booster is provided, if a multi-branchor or the like is provided in the transmission line between the booster and its power supply device, the voltage drop amount of the operating voltage signal may be reduced due to the voltage drop of the diode or the like and the conductor loss of the transmission line. There was a case where it became large and the booster output became unstable and the converter malfunctioned.

In view of the above problems, the present invention is directed to a satellite receiving system capable of reliable polarization switching without being affected by the characteristics of a transmission line, a distributor, etc., and a booster device and a power supply device used in the system. The task is to provide.

[0007]

In order to solve the above-mentioned problems, the invention of claim 1 receives two kinds of satellite signals having different polarization planes and polarizes them from a terminal device provided at the receiving end. Operate the transmission signal from the antenna by transmitting the switching signal,
A satellite receiving system for transmitting one of the received radio waves by one coaxial cable, wherein a converter for switching between the two types of received radio waves by a polarization switching signal sent from a terminal device and outputting only one of the signals is provided. A satellite receiving antenna having, and a booster device that is inserted in the middle of the transmission path and amplifies the transmission signal from the satellite receiving antenna, and is inserted in the transmission path between the booster device and the terminal device,
A power supply device for supplying electric power to the booster device, wherein the power supply device receives a polarization switching signal from the terminal device and selects a switching signal for selecting one of the two types of received radio waves as a DC voltage signal. , A first signal converter for converting a switching signal for selecting the other into a pulsating current voltage signal in which a voltage signal that cyclically changes to a DC voltage is superimposed and sending it to the satellite receiving antenna side is incorporated, and the booster device is provided with the DC signal. Alternatively, a second signal converter for receiving a pulsating voltage signal and reconverting it into a polarization switching signal capable of switching the reception radio wave of the converter is incorporated.

[0008]

According to a second aspect of the present invention, a power supply device for supplying power to a booster device for amplifying a transmission signal sent from a satellite receiving antenna capable of receiving two kinds of satellite signals having different polarization planes to a terminal device provided at a receiving end. And receiving a polarization switching signal composed of different DC voltage signals transmitted from the terminal device, which is inserted into a transmission path between the booster device and the terminal device, and one of two types of reception signals is received. A first signal conversion in which a switching signal for selecting one is converted into a DC voltage signal, and a switching signal for selecting the other is converted into a pulsating current voltage signal in which a voltage signal that cyclically changes to a DC voltage is superimposed and sent to the satellite receiving antenna side. It is characterized by incorporating a container.

A third aspect of the present invention is a booster device for amplifying a transmission signal from a satellite receiving antenna capable of receiving two types of satellite signals having different planes of polarization. The satellite receiving antenna receives the pulsating current voltage signal superimposed with the periodically changing voltage signal, and
It is characterized in that it incorporates a second signal converter that converts received radio waves of different types into polarization switching signals composed of different DC voltage signals that can be transmitted and sends them to the satellite receiving antenna side.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a block diagram showing an example of a satellite receiving system according to the present invention, showing a system in which a received satellite signal and a terrestrial broadcast signal are mixed and transmitted by a single cable.

In the figure, reference numeral 1 denotes a CS antenna for receiving a left-handed circularly polarized signal and a right-handed circularly polarized signal from a CS satellite, which functions to convert a received radio wave into an IF signal and to switch a transmission signal by an operation from a receiving end. The converter 2 is provided with one cable 3a to send out one of the received signals. The cable 3a is connected to the booster device 4 on the way to amplify the signal. The ground waves received by the VHF antenna 5 and the UHF antenna 6 are mixed by the mixer 7 and transmitted by the single cable 3b, and are connected to the booster device 4 to amplify the signals in the same manner as satellite signals.

The booster device 4 amplifies and mixes the transmitted satellite signals and terrestrial signals, sends them out by one cable 3c, and is drawn into each room by the distributor 9, for example. The distributor 9 is an all-terminal conductive type capable of transmitting a DC voltage signal from any distribution output.
A power supply device 10 for supplying electric power to the booster device 4 is connected to the individual distribution outputs via a cable. Then, the received signal further passes through the distributor 11 via the power supply device 10,
It is sent to the CS tuner 13, the VTR 14 and the television receiver 15 connected to the distribution terminal.

The CS tuner 13 functions as a terminal device, and switches the polarization of the converter 2 provided in the CS antenna 1, that is, switches the output signal, which is well-known 11/15.
A converter power supply having a V switching function is built-in, and a DC voltage of 11V or 15V is sent to a CS antenna via a cable according to a received signal desired by a user. The CS tuner 13 may be a BS / CS tuner capable of receiving satellite broadcasting, and a digital tuner is usually used.

Power supply device 1 provided in the middle of the signal transmission path
0 is connected to a commercial power source and supplies electric power to the booster device 4 and the converter 2 via a cable, and at the same time, transmits a transmission signal from each antenna to the receiving end side through.
Then, as shown in the circuit block diagram of the power supply device of FIG. 3, it has a first signal converter 10a, receives a polarization switching signal from the CS tuner 13, and outputs a voltage signal corresponding to the signal to the antenna side. is doing. This voltage signal outputs 15 V to the antenna side when a voltage of approximately 15 V is input from the terminal side, and outputs a waveform in which a square wave is superimposed on 15 V when a voltage of approximately 11 V is input. .

As shown in the circuit block diagram of FIG. 2, the booster device 4 includes the first signal converter 10 of the power supply device 10.
a having a second signal converter 4a corresponding to
15V DC voltage or 15V
If a voltage signal without fluctuation of V comes in from the terminal side, 15
A DC voltage of V is output to the CS antenna side, and when a voltage signal in which a square wave is superimposed on 15V or a signal in which a square wave is superimposed on a voltage close to 15V is input, 11V is output to the CS antenna side.

As described above, since the power supply device is provided with the first signal converter and the booster device is provided with the second signal converter, the converter polarization switching signal between the two is discriminated between DC and square wave. An all-terminal conductive type branch device is interposed between the booster device and the booster device, and due to the long transmission path between the two, even if a voltage that easily causes malfunction due to a large voltage drop enters the booster device, CS in booster device
It is possible to reliably recognize whether the voltage signal sent from the tuner is an 11V signal or a 15V signal, and send the polarization switching voltage signal of 11 / 15V from the booster device to the CS antenna which is a satellite receiving antenna. You can
Therefore, the polarization switching of the converter can be reliably performed without being affected by the state or characteristics of the transmission line or the distributor. Further, by incorporating the first signal converter in the power supply device provided in the middle of the transmission line and the second signal converter in the booster device, the satellite receiving system of the present invention can be realized without interposing a new device in the transmission line. Can be formed.

The square wave to be superimposed on the operating voltage may be a pulse-like waveform having a narrow time width, a pulsating wave such as a sine wave, or a voltage signal that changes periodically. For example, the difference between the two signals can be detected simply by providing a differentiating circuit. The cycle is, for example, about 100.
It is good to set it to kHz. In addition to the booster device and the converter, the power supply device may supply power to all the devices provided on the transmission line, such as the block converter and the second booster device.

[0019]

As described in detail above, according to the first aspect of the invention, the polarization of the satellite receiving antenna can be switched without being affected by the characteristics of the transmission line, the distributor and the like. Since the first signal converter is incorporated in the power supply device provided in the middle of the transmission path and the second signal converter is incorporated in the booster device, only the booster device and its power supply device are provided to transmit the dedicated device. It is possible to switch the polarization of the satellite receiving antenna without intervening in the path and without being affected by the characteristics of the transmission path and the distributor.

[0020]

According to the inventions of claims 2 and 3, since the signal converters are incorporated respectively, the satellite receiving system according to claim 1 is provided by providing the booster device and the power supply device in the satellite signal transmission path. It can be formed, and the polarization of the satellite receiving antenna can be switched without being affected by the transmission line and the distributor.

[Brief description of drawings]

FIG. 1 is a block diagram of a satellite reception system showing an example of an embodiment of the present invention.

FIG. 2 is a circuit block diagram of a booster device showing an example of an embodiment of the present invention.

FIG. 3 is a circuit block diagram of a power supply device showing an example of an embodiment of the present invention.

[Explanation of symbols]

1 ... CS antenna, 2 ... Converter, 3a, 3b,
3c ... Cable (coaxial cable), 4 ... Booster device, 4a ... Second signal converter, 5 ... VHF antenna,
6 ... UHF antenna, 7 ... mixer, 9 ... distributor,
10 ... Power supply device, 10a ... First signal converter, 11 ...
・ Distributor, 13 ・ ・ CS tuner, 14 ・ ・ VTR, 1
5. TV receiver.

Continuation of front page (51) Int.Cl. ⁷ identification code FI H04N 7/20 630 H04N 7/20 630 (58) Fields investigated (Int.Cl. ⁷ , DB name) H04B 1/18 H01Q 21/28 H04N 5/44 H04N 5/63 H04N 7/20 630

Claims (3)

(57) [Claims] 1. A coaxial cable for receiving two types of satellite signals having different polarization planes, transmitting a polarization switching signal from a terminal device provided at a receiving end, and operating a transmission signal from an antenna. And a satellite receiving system having a converter for switching between the two types of received radio waves by a polarization switching signal sent from a terminal device and outputting only one of the signals. It is inserted in the middle of the transmission path and amplifies the transmission signal from the satellite receiving antenna.
Between the booster device and the terminal device
It is inserted into the transmission path and supplies power to the booster device.
And a source device, the power supply apparatus, among the two types of received radio wave receiving polarized wave switching signal from the terminal device, the switching signal for selecting either the DC voltage signal, switching to select the other A first signal converter that converts a signal into a pulsating current voltage signal in which a voltage signal that cyclically changes to a direct current voltage is superimposed and sends it to the satellite receiving antenna side is incorporated, and the booster device receives the direct current or pulsating current voltage signal. Te, satellite receiver system characterized by incorporating a second signal converter receiving electric wave switching operation of the converter is re-converted into polarized wave switching signal possible. 2. From a satellite receiving antenna capable of receiving two types of satellite signals having different polarization planes to a terminal device provided at a receiving end.
The power supply device for supplying power to the booster device to amplify a transmission signal to send, is inserted in the transmission path between the booster device and the terminal device, or different DC voltage signal is sent from the terminal device
Receiving polarization wave switching signal that al made, two types of switching signal for selecting one of the received signal into a DC voltage signal, and superimposes a voltage signal that periodically varies in DC voltage switching signal for selecting the other A power supply device incorporating a first signal converter for converting into a pulsating voltage signal and sending it to the satellite receiving antenna side. 3. A booster device for amplifying a transmission signal from a satellite receiving antenna capable of receiving two types of satellite signals having different polarization planes, which is a voltage signal sent from a terminal and periodically changing to a direct current or a direct current voltage. Receiving a pulsating current voltage signal on which is superimposed, the satellite receiving antenna converts the two types of received radio waves into a polarization switching signal composed of different DC voltage signals that can be transmitted, and sends out to the satellite receiving antenna side. Booster device with built-in signal converter.