JP3182792B2 - Polarization switching signal converter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polarization switching signal converter which is compatible with a satellite broadcast converter and a receiver in a different system.

[0002]

2. Description of the Related Art In the near future, satellite broadcasting will include CS broadcasting using a communication satellite in addition to the current BS broadcasting. This C
The radio wave of the S broadcast is a linearly polarized wave, and two broadcasts are transmitted simultaneously by a vertically polarized wave and a horizontally polarized wave. There are three types of satellite broadcast receiving systems shown in FIGS.

In the receiving system shown in FIG. 4, a converter C ₁ and a receiver T ₁ are connected by only one signal cable 1. Converter C ₁ simultaneously respectively captures horizontal polarization and vertical polarization, which is focused by the CS antenna A, converts respectively the signals that this takes on a predetermined frequency. Then, the horizontal polarization signal and the vertical polarization signal are selectively output according to the voltage level of the converter power supply. The receiver T ₁ supplies converter power to the converter C ₁ via the signal cable 1. When the horizontally polarized broadcast is selected, the voltage level of the converter power supply is set to 15 V, and when the vertically polarized broadcast is selected, the converter power supply voltage level is set to 11 V.

According to this system, only one signal cable 1 is required because the converter power supply itself supplied by the signal cable 1 for broadcast signals is used as the polarization switching signal.

[0005] The receiving system of FIG. 5 are connected by the converter C ₂ and the receiver T ₂ is three signal cables 2 for one addition to the control signal of the signal cable 1 for broadcasting signals. The converter C ₂ is Porarota scheme, converts the rotational position of the probe a probe to take the power to rotate the motor. The conversion of the rotational position selectively captures the horizontal polarization and the vertical polarization. The receiver T ₂ supplies converter power to the converter C ₂ via a signal cable 1 for broadcast signals and outputs a polarization switching signal via a signal cable 2 for control signals. The polarization switching signal is composed of +5 V and a ground signal for driving the motor and a pulse signal for controlling the rotational position, and the rotational position is controlled by the pulse width of the pulse signal.

According to this system, a plurality of signal cables 1 and 2 are required.

In the receiving system shown in FIG. 6, a converter C ₃ and a receiver T ₃ are connected by two signal cables 2 for control signals in addition to one signal cable 1 for broadcast signals. The converter C ₃ is a magnetic polar rotor system, converts the radio wave capturing radio waves input to the primary horn is rotated by an electromagnetic field. Horizontally polarized waves and vertically polarized waves are selectively captured depending on whether or not an electromagnetic field is generated. Receiver T
₃ outputs a converter power and polarization wave switching signal similar to that of FIG. 5 to the converter C _3. The polarization switching signal is a current for generating an electromagnetic field, and selects a polarization signal to be taken in depending on whether or not current is supplied.

This system also requires a plurality of signal cables 1 and 2 as in FIG.

[0009]

In the system of the above three types [0005] The configuration of the converter C ₁ -C ₃ and the receiver T ₁ through T ₃ per system has a drawback that incompatible because different .

Accordingly, an object of the present invention is to provide a polarization switching signal converter capable of receiving satellite broadcasts even with converters and receivers of different systems.

[0011]

According to the present invention, there is provided a polarization switching signal converter comprising a vertically polarized wave and a horizontally polarized wave.
When switching polarization, there are several different switching methods.
In a polarization switching signal converter for converting to a quasi switching method,
Control signals from several different switching receivers
Based on the polarization switching signal transmitted via the
For converter control signals compatible with the standard switching method
Polarization conversion means for converting, and a reference by the polarization conversion means.
The converter controller converted in accordance with the switching method
A roll signal is transmitted from the receiver to a signal cable for a broadcast signal.
Superimposed on the converter power transmitted through the
And a signal line for the broadcast signal.
The converter which is transmitted by being superimposed on the converter power supply
Select multiple broadcast signals based on remote control signals
A converter for outputting and a signal cable for the broadcast signal
The power of the converter is supplied through the
The polarization switching signal via a signal cable for a troll signal.
Characterized in that it is interposed between the receiver and the receiver that supplies the signal.
are doing.

[0012]

When a control signal is output from a receiver via a signal cable for a control signal, the control signal is converted into a control signal for a converter, and the converted control signal is superimposed on a converter power supply and broadcast. The signal is sent to a converter via a signal cable for the broadcast, and the converter selects and outputs a broadcast signal based on the control signal.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a first embodiment of the present invention.

FIG. 2 is a block diagram of a satellite broadcast receiving system using the polarization switching signal converter 3 according to the present invention. In FIG. 2, the converter C ₁ uses the system shown in FIG. 4, and the receiver T ₂ (or T ₃ ) uses the system shown in FIG. 5 or FIG. A polarization switching signal converter 3 is interposed between the converter C ₁ and the receiver T ₂ (or T ₃ ), and a signal for a broadcast signal is transmitted between the converter C ₁ and the converter C _1. It is connected by a cable 1 and connected to a receiver T ₂ (or T ₃ ) by signal cables 1 and 2 for a broadcast signal and a control signal.

FIG. 1 is a circuit block diagram of the polarization switching signal converter 3. As shown in FIG. In FIG. 1, a signal input terminal t
₁ signal cable 1 for broadcasting signals of the converter C ₁ is connected to, the signal output terminal t ₂ signal cable 1 for broadcast signal receiver T ₂ (or T ₃₎ is connected.

A signal cable 2 for a control signal is connected to one of the control signal terminals t _{3 to} t ₅ when the receiver T ₂ is of the polar rotor type, and the other control signal terminals t ₆ and t ₇ are connected to the control signal terminals t ₃ and t _7. machine T ₃ the signal cable 2 for the control signal is connected to the case of the magnetic polar rotor system.

The signal input terminal t ₁ and the signal output terminal t ₂ are connected via a capacitor 4 so that only a broadcast signal is transmitted through this line.

The change-over switch SW has common terminals t ₈ , H and L
It has two selection terminals t _9, t _10, the common terminal t ₈ is connected to the signal input terminal t _1. The H selection terminal t ₉ is connected to the signal output terminal t ₂ , and the L selection terminal t ₁₀ is connected to the three-terminal regulator 10 . 3 terminal regulator 10
Is connected to the signal output terminal t ₂ and the three-terminal regulator 1
0 converts the voltage level of the converter power supply to +11 V and outputs it. Therefore, converter power supply + 15V to the H selection terminal t ₉ is the L selection terminal t ₁₀ is supplied with the converter power + 11V. The switching of the changeover switch SW is controlled by a switch control signal from the polar rotor polarization detection circuit 11 or the magnetic polar rotor polarization detection circuit 12.

The polar rotor polarization detection circuit 11 receives a polar rotor control signal from one of the control signal terminals t _{3 to} t ₅ and detects the type of the selected broadcast from the pulse width of the inputted polar rotor control signal.
A switch control signal is output to the changeover switch SW so as to select the H selection terminal t ₉ when the selected broadcast is a horizontally polarized broadcast and to select the L select terminal t ₁₀ when the selected broadcast is a vertically polarized broadcast.

A magnetic polar rotor control signal is input to the magnetic polar rotor polarization detection circuit 12 from the other control signal terminals t ₆ and t ₇ .
The type of the selected broadcast is detected from the current value or voltage value of the input magnetic polar rotor control signal.
A switch control signal is output to the changeover switch SW so as to select the H selection terminal t ₉ when the selected broadcast is a horizontally polarized broadcast and to select the L select terminal t ₁₀ when the selected broadcast is a vertically polarized broadcast.

The operation of the above configuration will be described below.
When the power of the receiver T ₂ (or T ₃ ) is turned on and one of the horizontal polarization broadcast and the vertical polarization broadcast is selected, the receiver T 2
₂ (or T ₃ ), a converter power of +15 V is supplied via a broadcast signal signal cable 1 and a polar rotor (or magnetic polar rotor) control signal is output via a control signal signal cable 2.

The polar rotor polarization detection circuit 11 (or magnetic polar rotor polarization detection circuit 12) of the polarization switching signal converter 3 detects the type of the selected broadcast from the control signal and performs switch control according to the type of the selected broadcast. Output a signal. The changeover switch SW is selected broadcast is connected to the H selection terminal t ₉ if horizontally polarized broadcast, + 15V
Converter power is supplied to the converter C ₁ via the signal cable 1. If the selected broadcast is a vertically polarized broadcast, the selected broadcast is connected to the L select terminal, and +11 V converter power is supplied to the converter C ₁ via the signal cable 1.

The converter C ₁ is driven by the converter power supply and detects the voltage level. If the voltage level is +15 V, the converter C ₁ outputs a horizontally polarized signal and the voltage level is +15 V.
If the voltage is 11 V, a vertically polarized signal is output. This output signal is sent to the receiver T ₂ (or T ₃ ) via the broadcast signal cable 1, the polarization switching signal converter 3, and the broadcast signal cable 1.

FIG. 3 is a circuit block diagram of a polarization switching signal converter 3 according to a second embodiment. In the second embodiment, a case will be described in which a converter that selects an output signal based on a pulse signal superimposed on a converter power supply is used. In FIG. 3, the signal input terminal t ₁
And the signal output terminal t ₂ are connected via a trap circuit 13, which passes only high-frequency broadcast signals,
This is to prevent the following pulse signal from being supplied to the receiver.

The polar rotor polarization detection circuit 11 and the magnetic polar rotor polarization detection circuit 12 detect the type of the selected broadcast from the pulse signal and output it to the encoder 14. The encoder 14 outputs a pulse signal corresponding to the type of the selected broadcast.
Through the output to the signal input terminal t _1.

According to the second embodiment, as in the first embodiment, the converter power is sent from the receiver to the polarization switching signal converter 3 via the broadcast signal cable 1 and the control signal is transmitted. A control signal is transmitted via the signal cable 2, and a converter power supply and a pulse signal superimposed on the converter power are transmitted from the polarization switching signal converter 3 to the converter C ₁ via the broadcast signal signal cable 1. Then, converter C ₁ selects the output broadcast by detecting the pulse signal.

In the first and second embodiments, as shown in FIG. 2, the polarization switching signal converter 3 is installed indoors and the receiver T ₂
(Or T ₃ ), the converter C ₁ and the receiver T ₂ (or T ₃ ) need only be connected by almost one signal cable 1.

In the first embodiment, the case where the polarization switching signal is shared with the converter power supply is shown. In the second embodiment, the case where the polarization switching signal is a pulse signal superimposed on the converter power supply is shown. Other signals may be used as long as they can be superimposed on the power supply and do not adversely affect the transmission of the broadcast signal.

[0029]

As described above, according to the present invention, the vertical
When switching between polarization and horizontal polarization, several different
Polarization switching signal converter that converts the conversion method to the reference switching method
Control from multiple receivers with different switching systems.
Polarization cutoff transmitted via signal cable for roll signal
Converter control corresponding to the switching method of the reference signal
Polarization conversion means for converting the signal into a polarization signal, and the polarization conversion means
The converter is converted according to the reference switching method by the
Data control signal from the receiver for a broadcast signal.
Superimposed on converter power transmitted via signal cable
And a signal cable for the broadcast signal.
Before being superimposed on the converter power supply via the
Multiple broadcast signals based on the converter control signal
And a converter for selectively outputting the broadcast signal.
When the converter power is supplied via the
Through a signal cable for the control signal
An intervening device is provided between the receiver for supplying the polarization switching signal.
With such a configuration, there is an effect that a satellite broadcast receiving system can be configured using converters and receivers of different systems.

[Brief description of the drawings]

FIG. 1 is a circuit block diagram of a polarization switching signal converter (first embodiment).

FIG. 2 is a configuration diagram of a satellite broadcast receiving system (first embodiment).

FIG. 3 is a circuit block diagram of a polarization switching signal converter (second embodiment).

FIG. 4 is a configuration diagram of a satellite broadcast receiving system (conventional example).

FIG. 5 is a configuration diagram of a satellite broadcast receiving system (conventional example).

FIG. 6 is a configuration diagram of a satellite broadcast receiving system (conventional example).

[Explanation of symbols]

C ₁ , C ₂ , C ₃ ... converter, T ₁ , T ₂ , T ₃ ... receiver,
1. Signal cable for broadcast signal, 2. Signal cable for control signal, 3. Polarization switching signal converter.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01Q 3/00-3/46 H01Q 21/00-21/30 H01Q 23/00 H01Q 25/00-25 / 04 H01P 1/00

Claims (1)

(57) [Claims] 1. When switching between vertical polarization and horizontal polarization
First, convert a plurality of different switching modes to a reference switching mode.
That the polarized-wave switching signal converter, the control signals from a plurality of different switching system receiver
Based on the polarization switching signal transmitted via the
For converter control signals compatible with the standard switching method
Polarization conversion means for converting, and conversion by the polarization conversion means in accordance with a reference switching method.
The converter control signal to be transmitted to the receiver
From a computer via a signal cable for broadcast signals.
Superimposing means for superimposing on the power supply to the converter, wherein the converter is connected via a signal cable for the broadcast signal.
The converter control transmitted by being superimposed on the power supply
A converter that selectively outputs multiple broadcast signals based on signals
And a signal cable for the broadcast signal.
Supply inverter power and for the control signal
Before supplying the polarization switching signal via the signal cable of
A polarization switching signal converter interposed between the receiver and the receiver .