JPH0555942A - Satellite broadcasting receiving system - Google Patents

Abstract

PURPOSE:To easily obtain an optimum adjustment point of a BS antenna without use of a level checker or the like by generating a visible or audible signal at the BS converter side with a control voltage in response to an antenna input signal level. CONSTITUTION:An output signal of an intermediate frequency amplifier circuit 6 is detected and amplified by an automatic gain adjustment amplifier circuit 12 and the result is led out as a gain adjustment control voltage for the intermediate frequency amplifier circuit 6. Since the control voltage is proportional to a signal level inputted to a BS tuner 15, the control voltage is fed to a BS converter use power supply circuit, the power supply voltage of which is changed corresponding to a signal level inputted to the BS tuner 15 within a prescribed range. The BS converter 2 detects a power supply voltage from the BS tuner 15 and generates a visible or audible signal changed in response to the voltage level. Thus, the user adjusts the installation angle of the antenna at the outdoor BS converter 2 so as to maximize the reception signal from the antenna while confirming the visible/audible signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a satellite broadcast receiving system, and more particularly to a satellite broadcast receiving system that facilitates adjustment of an antenna angle when installing and adjusting an outdoor unit.

[0002]

2. Description of the Related Art In recent years, satellite broadcasting receiving systems have become widespread with the start of full-scale satellite broadcasting services. Since the satellite broadcasting receiving system efficiently receives weak radio waves from broadcasting satellites in the geostationary orbit on the equator, the installation angle of the parabolic antenna must be adjusted accurately when installing the outdoor unit consisting of the parabolic antenna and BS converter. Must be done.

FIG. 4 is a block diagram of a conventional example. In FIG. 4, a parabolic antenna 1 and a BS converter 2 that form an outdoor unit transmit from a broadcasting satellite 1
The 2 GHz signal is received and supplied to the BS tuner 15 installed indoors via the coaxial cable 3.

In the BS tuner 15, after being amplified by the high frequency amplifying circuit 4, it is mixed with the signal from the local oscillating circuit 10 by the mixing circuit 5 so as to be converted into a low frequency of a desired channel, and then, through the intermediate frequency amplifying circuit 6, FM The video signal is demodulated by the demodulation circuit 7, the video processing circuit 13 processes various video signals to derive a video output, and the audio signal is derived via the audio signal processing circuit 14 as an audio output.

On the other hand, the output of the intermediate frequency amplifying circuit 6 is returned to the intermediate frequency amplifying circuit 6 through the automatic gain adjusting and amplifying circuit 12 and is guided to the antenna level check terminal T. 11 is a power supply for the BS converter,
The power supply voltage from the converter power supply 11 is supplied to the BS converter 2 via the diode 9 and the low-pass filter 8 and further via the coaxial cable 3 described above.
Will be the power source.

In the conventional satellite broadcasting receiving system, the installation angle of the parabolic antenna 1 is adjusted by outputting the control voltage of the automatic gain adjustment amplifier circuit 12 provided in the BS tuner 15 of the indoor unit from the antenna level check terminal T. The method is performed by detecting the level of the received signal sent from the outdoor unit, or the method is performed directly on the outdoor unit side by using a dedicated antenna level measuring instrument.

[0007]

In the case where the reception level of the antenna is detected on the BS tuner side of the indoor unit as in the above-mentioned conventional case, the BS tuner installation location and B
Since the installation location of the S antenna is located far away, there is a problem that the reception level of the antenna cannot be confirmed at the installation location of the antenna and a large number of people are required to install the antenna. There is a problem that a dedicated antenna level measuring device is required for the one directly measuring on the side.

As for these, satellite broadcasting receiving systems have spread,
Due to the miniaturization of BS antennas, the number of cases where a user installs an antenna is increasing, but this is an obstacle.

[0009]

In order to solve the above problems, the present invention provides an outdoor unit including a receiving antenna and a BS converter, supplies power to the outdoor unit, and outputs an image or a high-frequency signal from the outdoor unit. In a satellite broadcasting receiving system including a BS tuner for obtaining an audio baseband signal, a control voltage generating unit for generating a control voltage according to a signal level input to the BS tuner, and a control voltage from the control voltage generating unit are used. Accordingly B
BS converter power supply means for changing the power supply voltage supplied to the S converter, voltage detection means provided on the BS converter side for detecting the power supply voltage sent from the BS converter power supply means to the BS converter, and the voltage detection means And a signal generating means provided on the BS converter side for generating a visible or audible signal corresponding to the voltage level detected by.

[0010]

According to the above construction, when the received signal from the antenna is input to the BS tuner installed indoors, a control signal corresponding to the signal level of the received signal is generated as a control voltage from the automatic gain adjustment amplifier, and the control is performed. By changing the power supply voltage of the BS converter power supply means within a predetermined range by the signal,
Supply to S converter.

The BS converter detects the power supply voltage from the BS tuner and generates a visible or audible signal that changes according to the detected voltage level. Therefore, the user adjusts the installation angle of the antenna so as to maximize the level of the received signal from the antenna while confirming the visible or audible signal on the outdoor BS converter side.

[0012]

1 and 2 are block diagrams of an embodiment of the present invention. FIG. 1 shows the overall configuration of the present invention. In FIG. 1, 12 GHz transmitted from the broadcasting satellite
The radio wave transmitted in the band is received by the parabolic antenna 1 and collected by the BS converter 2. 12 GHz for BS converter 2
Converts z-band right-handed circularly polarized wave to linearly polarized wave and further amplifies 1
The frequency is converted to GHz and the signal is sent to the BS tuner 15 via the coaxial cable 3.

The signal input to the BS tuner 15 is amplified by the high frequency amplifier circuit 4, and the local oscillating circuit 10 and the mixing circuit 5 select the signal of the desired channel and frequency-convert it. Next, the frequency-selected and frequency-converted signal is amplified by the intermediate frequency amplification circuit 6 and sent to the FM demodulation circuit 7. FM
The video signal demodulated by the demodulation circuit 7 is the video signal processing circuit 1
A video signal output is obtained via 3.

On the other hand, for the voice signal, the voice carrier is picked up from the output of the FM demodulation circuit 7 and the voice signal processing circuit 14 is operated.
Then, the audio processing circuit 14 performs processing such as DPSK demodulation, PCM demodulation, D / A conversion, etc. to obtain an audio output.

The output signal of the intermediate frequency amplification circuit 6 is detected and amplified by the automatic gain adjustment amplification circuit 12 and derived as a control voltage for gain adjustment of the intermediate frequency amplification circuit 6. Since this control voltage is proportional to the signal level input to the BS tuner 15, this control voltage is applied to the BS converter power supply circuit 11 so that the power supply voltage corresponds to the signal level input to the BS tuner 15 within a predetermined range. Let it change. Reference numeral 16 denotes a switch for switching between the antenna level adjustment mode and the normal reception mode, which is normally kept in the reception mode. B
The power supply voltage derived from the S converter power supply circuit 11 is sent to the BS converter 2 through the backflow prevention diode 9 and the low pass filter 8 and the coaxial cable 3.

FIG. 2 shows an embodiment of the BS converter according to the present invention. In FIG. 2, the signal converted to the 12 GHz band linearly polarized wave is amplified by the high frequency amplifier circuit 17, frequency-converted to the 1 GHz band by the local oscillation circuit 20 and the mixing circuit 18, and then amplified by the intermediate frequency amplifier circuit 19 to be amplified by the BS tuner 1.
5 is sent.

On the other hand, the power source transmitted from the BS tuner 15 is added to the stabilized power source circuit 21 via a low pass filter (LPF) 22. The signal is also supplied to the V / F converter 24 and converted into a signal having a frequency according to the level of the power supply voltage supplied from the BS tuner 15. Therefore, the LED 25 connected to the V / F converter 24 is B
Since it blinks at a frequency corresponding to the level of the reception signal received by the S tuner 15, the level of the reception signal, that is, the installation angle of the antenna can be adjusted by checking the blinking speed of the LED 25.

The above adjustment can be performed when the switch 16 provided in the BS tuner 15 is switched to the antenna level adjustment mode, and after the installation of the antenna is completed, the switch 16 is set to the normal reception mode. DC 12V is supplied to the BS converter 2 in the normal reception mode. In the antenna level adjustment mode, the power supply voltage is controlled within a predetermined range according to the signal level of the reception signal on the BS tuner side.

When the input signal level is high, the power supply voltage is raised to raise the output frequency of the V / F converter 24 and the LED 25 blinks faster. When the input signal level is low, the power supply voltage is lowered to reduce the V / F converter 2
The output frequency of 4 is lowered and the blinking of the LED 25 is delayed.

FIG. 3 illustrates the level of the power supply voltage for the BS converter. In FIG. 3, (a) is BS
The power supply voltage supplied from the tuner 15, (b) is a stabilized power supply output voltage (DC15 in the BS converter 2).
V). Utilizing the above ranges (a) and (b), the BS converter 2 supplies a power supply voltage proportional to the antenna reception level.
, The frequency is converted by the V / F converter 24 to change the blinking speed of the LED 25, and the proper angle adjustment of the antenna can be easily performed by checking this speed.

In the above embodiment, on the BS converter side, the power supply voltage proportional to the antenna reception level supplied from the BS tuner side is frequency-converted by the V / F converter 24 to check the blinking speed of the LED 25. However, instead of displaying with an LED, it is possible to confirm with an audible signal such as sound intensity, high or low.

[0022]

Since the present invention has the above-mentioned configuration,
When installing and adjusting the S antenna, the maximum point of the input signal level from the antenna can be confirmed at the antenna installation location without using a dedicated antenna input level checker, etc., and the optimum adjustment point for the BS antenna can be easily set. Can be found in.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

FIG. 2 is a block diagram of a BS converter used in the present invention.

FIG. 3 is an operation explanatory diagram of the BS converter used in the present invention.

FIG. 4 is a block diagram of a conventional example.

[Explanation of symbols]

 1 Parabolic Antenna 2 BS Converter 11 Power Supply for BS Converter 12 Automatic Gain Adjustment Amplifier Circuit 15 BS Tuner 24 V / F Converter 25 LED

Claims (1)

[Claims] 1. A satellite broadcast receiving system comprising an outdoor unit comprising a receiving antenna and a BS converter, and a BS tuner for supplying power to the outdoor unit and for obtaining a video or audio baseband signal from a high frequency signal of the outdoor unit. , A control voltage generating means for generating a control voltage according to a signal level input to the BS tuner, and a BS according to the control voltage from the control voltage generating means.
BS converter power supply means for changing the power supply voltage supplied to the converter, and B from the BS converter power supply means
Voltage detection means provided on the BS converter side for detecting the power supply voltage sent to the S converter, and signal generation provided on the BS converter side for generating a visible or audible signal according to the voltage level detected by the voltage detection means A satellite broadcasting receiving system, characterized in that it is provided with means.