JP2001177428A - Satellite reception system, and booster used by the system and power supply - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a satellite reception system that can select a polarized wave without being affected by characteristics of a transmission channel and a distributor or the like. SOLUTION: A 2nd signal converter 4a is built in a booster 4 interposed on the way of a cable used to transmit a signal received from a CS antenna 1 and a 1st signal converter 10a is incorporated in its power supply device 10 respectively. The 1st signal converter 10a provides an output of 15 V power toward the antenna side when receiving a 15 V signal in a 11/15 V polarized wave switching signal from a CS tuner 13 and provides an output of 15 V power on which a square wave is superimposed toward the antenna side when receiving a 11 V signal in the 11/15 V polarized wave switching signal. The 2nd signal converter 4a provides an output of 15 V power toward the antenna side when receiving a 15 V signal or a DC voltage of about 15 V and provides an output of 15 V power to the antenna side when receiving a signal on which a square wave is superimposed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to a satellite receiving system that receives various types of satellite signals and transmits either one of the signals to a receiving end through 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 of left-handed circularly polarized waves and right-handed circularly polarized waves, and a CS antenna that receives these radio waves can receive both types of radio waves. It has become. The two types of radio waves have a left-handed circular polarization of 12.25 GHz to 12.73 GHz and a right-handed circular polarization of 12.27 GHz to 12.75 GHz. Is transmitted to the receiving end, two types of received radio waves can be transmitted simultaneously by separately transmitting signals using two coaxial cables (hereinafter simply referred to as cables).
If the types of radio waves are mixed and transmitted by one cable, they cannot be separated at the receiving end and cannot be transmitted by one cable at the same time.

[0003] Therefore, in the case of transmission using a single 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 the former is expensive in system. The latter has been widely adopted. In this case, a polarization switching system in which a transmission signal from a CS antenna is switched by a switching signal from a receiving end and only one of the polarization signals is transmitted is widely adopted. This switching is normally performed by a CS tuner installed at the receiving end, and is performed by switching the operation of an IF conversion converter corresponding to each polarization provided in the CS antenna. The DC voltage supplied from the converter operating power supply unit built in the CS tuner is switched to, for example, 11 V / 15 V via a cable serving as a transmission path, and the switching is performed by the converter detecting the voltage difference and switching the operating converter. ,
One of the two types of received radio waves was IF-converted and output.

[0004] 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 signal increases, and the receiving end receives a large amount of attenuation. Since it is difficult to obtain good reception characteristics, a booster (amplifier) is usually provided in the middle of a transmission line. In such a configuration, the polarization switching type satellite receiving system is disclosed in
The technology disclosed in -257410 is known,
Both the booster and the power supply of the booster provided between the booster and the terminal device are provided with a through circuit for the converter operating voltage signal sent from the CS tuner, and the CS antenna is operated without changing the operating voltage signal from the CS tuner. Had been sent to the converter.

[0005]

However, since a distributor, a branching device, or the like used in such a receiving system must pass a voltage signal from a CS tuner, any distributor terminal or branching device is required. All terminal Dentsu type that can pass the operating voltage from the terminal is used,
In these devices, a diode element for preventing a backflow of current is provided at each branch or distribution terminal, which causes a voltage drop. Therefore, even if a booster is provided, if a multi-branch device or the like is provided on the transmission line between the booster and its power supply device, the voltage drop amount of the operating voltage signal due to the voltage drop of the diode or the conductor loss of the transmission line, etc. In some cases, the booster output became unstable and the converter malfunctioned.

SUMMARY OF THE INVENTION In view of the above problems, the present invention provides a satellite receiving system capable of reliably switching polarization without being affected by characteristics of a transmission line, a distributor, and the like, 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, a first aspect of the present invention is to receive two types of satellite signals having different polarization planes and to transmit a polarization switching signal from a terminal device provided at a receiving end. To operate the transmission signal from the antenna and
What is claimed is: 1. A satellite receiving system for transmitting any one of received radio waves by a coaxial cable, comprising a converter for switching between the two types of received radio waves by a polarization switching signal transmitted from a terminal device and outputting only one signal. A satellite receiving antenna, inserted in the middle of a transmission path, receives a polarization switching signal from a terminal device, selects a switching signal for selecting one of the two types of received radio waves into a DC voltage signal, and selects the other. A first signal converter for converting a switching signal to be converted into a pulsating voltage signal on which a voltage signal that periodically changes to a DC voltage is superimposed and transmitting the signal to a satellite receiving antenna, and a first signal converter between the first signal converter and the satellite receiving antenna. A second signal converter that is inserted into a transmission line, receives the DC or pulsating voltage signal, and reconverts the received signal into a polarization switching signal capable of performing a received radio wave switching operation of the converter. And butterflies.

According to a second aspect of the present invention, in the first aspect, the second signal converter is incorporated in a booster device for amplifying a transmission signal from a satellite receiving antenna, and the first signal converter is connected to the booster device and a terminal device. And is incorporated in a power supply device that is inserted into a transmission path between the power supply and the power supply to supply power to the booster.

According to a third aspect of the present invention, there is provided a power supply device for supplying power to 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. Upon receiving the polarization switching signal transmitted from the terminal device and inserted into the transmission path between the terminal device, the switching signal for selecting one of the two types of received signals is converted to a DC voltage signal, and the other is switched to the DC voltage signal. A switching signal to be selected is converted into a pulsating voltage signal in which a voltage signal that periodically changes to a DC voltage is superimposed and transmitted to the satellite receiving antenna side.
It is configured by incorporating a signal converter.

According to a fourth aspect of the present invention, there is provided 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. Upon receiving the pulsating voltage signal on which the periodically changing voltage signal is superimposed, the satellite receiving antenna
A second signal converter for converting a type of received radio wave into a polarization switching signal that can be transmitted and transmitting it to the satellite receiving antenna side is incorporated.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a block diagram showing an example of a satellite reception system according to the present invention, which shows a system in which a received satellite signal and a terrestrial broadcast signal are mixed and transmitted through one cable.

In the drawing, 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, and a function of converting a received radio wave into an IF signal and switching a transmission signal by an operation from a receiving end. , And one of the received signals is transmitted by one cable 3a. The cable 3a is connected to the booster device 4 on the way to amplify the signal. Ground waves received by the VHF antenna 5 and the UHF antenna 6 are mixed by the mixer 7 and transmitted by one cable 3b, and connected to the booster device 4 like a satellite signal to amplify the signal.

The booster device 4 amplifies and mixes the transmitted satellite signal and terrestrial signal, sends out the signal through one cable 3c, and is drawn into each room by the distributor 9, for example. The distributor 9 is of an all-terminals conduction 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 distribution outputs via cables. The received signal further passes through the distributor 11 via the power supply device 10,
The signal is sent to the CS tuner 13, the VTR 14, the television receiver 15, and the like connected to the distribution terminal.

The CS tuner 13 functions as a terminal device, and switches the polarization of the converter 2 provided on the CS antenna 1, that is, switches the output signal.
A converter power supply having a V switching function is built in, and a DC voltage of 11 V or 15 V is transmitted to a CS antenna via a cable according to a reception signal desired by a user. Note that 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 a signal transmission line
Numeral 0 supplies power to the booster device 4 and the converter 2 via a cable connected to a commercial power supply, and transmits a transmission signal from each antenna to the receiving end through.
As shown in the circuit block diagram of the power supply device in FIG. 3, the power supply device 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. are doing. This voltage signal outputs, for example, 15 V to the antenna side when approximately 15 V voltage comes in from the terminal side, and outputs a waveform in which a square wave is superimposed on 15 V when approximately 11 V voltage comes in. .

The booster device 4 is connected to the first signal converter 10 of the power supply device 10 as shown in the circuit block diagram of FIG.
a having a second signal converter 4a corresponding to
15V DC voltage or 15V
When a voltage signal without fluctuation of V comes 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 15 V or a signal in which a square wave is superimposed on a voltage close to 15 V comes in, 11 V is output to the CS antenna side.

As described above, the first signal converter is provided in the power supply device, and the second signal converter is provided in the booster device, and the converter polarization switching signal between the two is discriminated between DC and square waves. Even if the all-terminal conducting branch is interposed between the booster and the booster device, and the transmission path between the two is long, a large voltage drop occurs and a voltage that easily causes malfunction enters the booster device. CS in booster device
It is possible to reliably recognize whether the voltage signal transmitted from the tuner is an 11V signal or a 15V signal, and to transmit an 11 / 15V polarization switching voltage signal from a booster device to a CS antenna which is a satellite receiving antenna. Can be.
Therefore, the polarization of the converter can be reliably switched without being affected by the state or characteristics of the transmission path or the distributor. Further, by incorporating the first signal converter into the power supply device provided in the middle of the transmission line and the second signal converter into the booster device, the satellite receiving system of the present invention can be implemented without interposing a new device in the transmission line. Can be formed.

The square wave 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 only by providing a differentiating circuit, for example. The period is, for example, approximately 100
kHz. The power supply device may supply power to all devices provided on the transmission line, such as a block converter and a second booster device, in addition to the booster device and the converter.

[0019]

As described above in detail, according to the satellite receiving system of the first aspect, 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.

According to the second aspect of the present invention, the first signal converter is incorporated in the power supply device provided in the middle of the transmission line, and the second signal converter is incorporated in the booster device. The polarization switching of the satellite receiving antenna can be performed without providing a dedicated device on the transmission line and without being affected by the characteristics of the transmission line, the distributor, and the like.

According to the third and fourth aspects of the present invention, since the signal converters are respectively incorporated, the booster device and the power supply device are provided in the satellite signal transmission path, so that the satellite receiving system according to the first aspect is provided. , And the polarization of the satellite receiving antenna can be switched without being affected by the characteristics of the transmission path, the distributor, and the like.

[Brief description of the drawings]

FIG. 1 is a block diagram of a satellite receiving 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.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04N 5/63 H04N 5/63 Z 5K062 7/20 630 7/20 630 F term (Reference) 5C025 AA22 BA21 BA26 DA04 5C026 EA06 5C064 DA08 DA12 5J021 AA02 AA03 AA13 AB02 AB07 BA01 CA01 CA06 DB04 FA21 FA26 FA31 HA05 HA07 JA05 5K061 AA11 BB08 BB09 BB10 BB19 CC00 CC03 CC04 CC45 EE00 EE05 EF01 A03 AE03 A00 EA23 A00 AE01 BD01 BE00 BF04

Claims (4)

[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 antenna having a converter that switches between the two types of received radio waves by a polarization switching signal transmitted from a terminal device and outputs only one signal. Receiving a polarization switching signal from the terminal device and inserting a switching signal for selecting one of the two types of received radio waves into a DC voltage signal and a switching signal for selecting the other of the two types of received radio waves. A first signal converter for converting a voltage signal that periodically changes to a DC voltage into a pulsating voltage signal superimposed on the pulsating voltage signal and transmitting the voltage signal to the satellite receiving antenna side; and a transmission path between the first signal converter and the satellite receiving antenna. A second signal converter, which is inserted and receives the DC or pulsating voltage signal, and reconverts the received DC or pulsating voltage signal into a polarization switching signal capable of performing a received radio wave switching operation of the converter. 2. A second signal converter is incorporated in a booster device for amplifying a transmission signal from a satellite receiving antenna, and a first signal converter is inserted in a transmission path between the booster device and a terminal device. The satellite receiving system according to claim 1, wherein the satellite receiving system is incorporated in a power supply device that supplies power to the booster. 3. A power supply device for supplying power to 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, wherein a power supply between the booster device and a terminal device is provided. In response to the polarization switching signal transmitted from the terminal device, a switching signal for selecting one of the two types of reception signals is converted into a DC voltage signal, and a switching signal for selecting the other is received. A power supply device incorporating a first signal converter for converting a voltage signal that periodically changes to a DC voltage into a pulsating voltage signal superimposed thereon and sending the converted signal to a satellite receiving antenna. 4. 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, wherein the voltage signal periodically changes to DC or DC voltage sent from a terminal side. And a second signal converter that receives the pulsating voltage signal superimposed on the received signal, converts the two types of received radio waves into a polarization switchable signal that can be transmitted by the satellite receiving antenna, and sends the signal to the satellite receiving antenna. Booster device.