JPH02114787A - Satellite broadcast receiver - Google Patents

Abstract

PURPOSE:To eliminate need for an angle setting jig such as a DC voltmeter and a cable by outputting an adjustment signal being an output signal of an adjustment signal generating circuit at BS antenna adjustment while it is replaced into a voice output signal of at least one channel in a voice signal processing circuit. CONSTITUTION:An adjustment signal generating circuit 17 consists of a voltage controlled oscillator VCO or the like and generates an adjustment signal with a frequency corresponding to (or proportional to) a DC AGC voltage. Switches 18, 19 are operated interlockingly, 2 channel of voice output signals from a voice signal processing circuit 11 are fed to voice signal output terminals 12, 13 at normal operation and an adjustment signal being an output signal of the adjustment signal generating circuit 17 is fed to the voice signal output terminal 12, 13 at the setting adjustment of the BS antenna. The BS antenna is adjusted by an azimuth angle and an elevation angle of the BS antenna 1 so that the frequency of the sound from a speaker is a maximum frequency.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a satellite broadcasting receiver, and particularly to a satellite broadcasting receiver that allows easy setting of the azimuth angle, elevation angle, etc. of a BS antenna, and does not require an angle setting jig. It concerns the receiver.

(Prior Art) FIG. 5 is a block diagram showing a conventional satellite broadcasting receiver.

Satellite broadcasting is 33 (Broadcasting 5at
Also known as ``elite'' broadcasting, it refers to broadcasting carried out from a broadcasting satellite (space station) launched above the equator.

Approximately 38. TV radio waves from a broadcasting satellite OOOkm away are weak and have a high frequency of 5HF (12GH, band), so the receiving antenna used in each home is the parabolic-shaped BS antenna 1 shown in Figure 5, which has a large gain. Use.

The 12GH2 band signal received by BS antenna 1 is B
The S converter 2 converts the frequency into the IGH band BS-IF signal, and the coaxial cable 3 converts the frequency to the BS-IF signal of the BS tuner 4.
It is supplied to the S-IF signal input terminal 5.

The BSIF signal supplied to the BS-IF signal input terminal 5 is supplied to the frequency conversion circuit 6 via the capacitor C without passing the high frequency component, and is converted into a signal in an intermediate frequency band.

The output signal of the frequency conversion circuit 6 is supplied to an AGC circuit 7.

The AGC circuit 7 operates to detect the amplitude of an input signal, generate a DC AGC voltage corresponding to the amplitude, and control the gain using the DC AGC voltage so that the amplitude of the output signal is constant.

Therefore, it can be seen that the DC AGC voltage of the AGC circuit 7 is proportional to (or corresponds to) the signal level (field strength) of the input signal received by the BS antenna 1.

The output signal of the AGC circuit 7 is supplied to an FM demodulation circuit 8, where it is FM demodulated to obtain a video signal to which an energy spread signal is added and an audio subcarrier subjected to 4-phase DPSK.

The FM demodulated video signal from the FM demodulation circuit 8 is supplied to a video signal processing circuit 9, which passes through a de-emphasis circuit that returns the pre-emphasized video signal to its original waveform, an energy diffusion signal removal circuit, and a video amplification circuit. The video output signal is taken out and supplied to the video signal output terminal 10.

Further, the audio subcarrier subjected to four-phase DPSK, which is the output of the FM demodulation circuit 8, is supplied to the audio signal processing circuit 11,
a 4-phase DPSK demodulation circuit that demodulates and obtains a PCM signal;
A PCM demodulation circuit that demodulates the PCM signal and extracts an audio signal from the digital signal extracts two channels of audio output signals and supplies them to audio signal output terminals 12 and 13.

Therefore, the output signals of the video signal output terminal 10 and the audio signal output terminals 12 and 13 are respectively supplied to a television receiver, a video tape recorder, a stereo amplifier, etc., and are utilized.

Note that since the BS converter 2 handles weak signals, the influence of hum modulation is minimized, and the housing is made smaller and smaller.
In order to reduce the weight, operating power is supplied from the BS tuner 4.

The DC power supply voltage (for example, 15V) generated by the BS converter power supply circuit 14 is superimposed on the BS-r F signal input terminal 5 via an inductance L that blocks high frequency components, and is superimposed on the BS-r F signal input terminal 5 via the coaxial cable 3. It is sent to BS converter 2.

Further, the DC AGC voltage is taken out from the AGC circuit 7 and supplied to the level check terminal 15 for use in direction adjustment when installing the antenna.

(Problem to be Solved by the Invention) As mentioned above, the distance from Japan to the broadcasting satellite is approximately 38.
There is also OOOkm, and by the time the radio waves reach the ground, the signal is very weak. In addition, the BS antenna has sharp directivity, and directional deviations have a noticeable effect on video and audio. Therefore, for long-term stable reception, it is important to adjust the direction when installing the antenna.

Generally, the BS antenna is adjusted by guiding the DC AGC voltage from the level check terminal 15 of the BS tuner 4 to the vicinity of the BS antenna using a cable, and connecting the DC voltmeter 16 as shown in FIG.

That is, as mentioned above, the DC AGC voltage of the AGC circuit 7 is B
It is proportional to (or corresponds to) the signal level (field strength) of the input signal received by the S antenna 1.

Generally, when the DC AGC voltage is at its maximum (or minimum), the signal level is at its maximum.

Therefore, the adjustment method is to adjust and set the azimuth angle, elevation angle, etc. of the BS antenna 1 so that the DC voltage at the DC voltmeter 16 becomes maximum (or minimum).

However, as mentioned above, this adjustment method requires BS antenna angle setting jigs such as a DC voltmeter and cables, which are items that ordinary households do not normally own, and are not available at installation adjustment companies (home electronics stores, etc.). ), there was a problem in that it was necessary to request adjustments each time.

In addition, when making adjustments, it is necessary to carry a DC voltmeter, cables, etc. to the vicinity of the BS antenna located at a high place outdoors such as on the roof, which increases the risk of falling as the amount of luggage increases.
Another problem was that it took a lot of time to adjust the installation.

The present invention has been made with attention to the above points, and an object of the present invention is to provide a satellite broadcasting receiver in which the azimuth angle, elevation angle, etc. of a BS antenna can be easily set, and an angle setting jig is not required. It is something.

(Means for solving the problem) In order to achieve the above objectives, (1) a BS for inputting a BS-IF signal received by a BS antenna, frequency-converted by a BS converter, and transmitted; - detecting the amplitude of the output signal of the IF signal input terminal, a frequency conversion circuit that converts the BS-IF signal to an intermediate frequency band, and the previous two frequency conversion circuits, and generating a DC AGC voltage corresponding to the amplitude; an AGC circuit that controls the gain using the DC AGC voltage so that the amplitude of the output signal is constant; and an FM demodulation circuit that performs FM demodulation of the output signal of the AGC circuit to separate and output a video signal and an audio signal. and de-emphasis the video signal which is the output signal of the FM demodulation circuit.
A video signal processing circuit that performs processing such as removal of an energy diffusion signal to obtain a video output signal; and a video signal processing circuit that performs processing such as removal of an energy diffusion signal to obtain a video output signal; and a video signal processing circuit that performs processing such as 4-phase DPSK demodulation and PCM demodulation on the audio signal that is the output signal of the FM demodulation circuit to obtain an audio output signal. an audio signal processing circuit that generates an adjustment signal with a frequency corresponding to the DC AGCI pressure, and an adjustment signal generation circuit that generates an adjustment signal with a frequency corresponding to the DC AGCI pressure; Provided is a satellite broadcasting receiver characterized in that it is configured with an adjustment switching circuit that switches and outputs the audio output signal of at least one channel of an audio signal processing circuit, C2) the satellite broadcasting receiver is received by a BS antenna, a BS-IF signal input terminal for inputting a BS-IF multiplied signal frequency-converted and transmitted by a BS converter; a frequency conversion circuit for converting the BS-IF signal to an intermediate frequency band; an AGC circuit that detects the amplitude of an output signal, generates a DC AGC voltage corresponding to the amplitude, and controls a gain using the DC AGC voltage so that the amplitude of the output signal is constant; and an output of the AGC circuit. An FM demodulation circuit that FM demodulates the signal and separates and outputs a video signal and an audio signal; and the video signal that is the output signal of the FM demodulation circuit is subjected to processing such as de-emphasis and removal of energy diffusion signals to produce a video output signal. a video signal processing circuit that obtains the FM
an audio signal processing circuit that obtains an audio output signal by performing processing such as 4-phase DPSK demodulation or PCM demodulation on the audio signal that is the output signal of the demodulation circuit; a frequency adjustment signal corresponding to the DC AGC voltage; and the DC an adjustment signal generation circuit that holds a DC AGC voltage when the signal level of the input signal received by the BS antenna is maximum among the AGC voltages and generates a reference signal of a frequency corresponding to the DC AGC voltage; B
and an adjustment switching circuit that switches and outputs the adjustment signal and reference signal, which are the output signals of the adjustment signal generation circuit, with the two-channel audio signal of the audio signal processing circuit when adjusting the S antenna. (3) a BS-IF for inputting a BS-IF signal received by a BS antenna, frequency-converted by a BS converter, and transmitted; a signal input terminal, a frequency conversion circuit that converts the BS-IF signal to an intermediate frequency band, detects the amplitude of the output signal of the frequency conversion circuit, generates a DC AGC voltage corresponding to this, and converts the DC AGC voltage. an AGC circuit that controls the gain so that the amplitude of the output signal is constant, and an FM
An FM demodulation circuit that demodulates and separates and outputs a video signal and an audio signal, and a video signal that processes the video signal that is the output signal of the FM demodulation circuit, such as de-emphasis and removal of energy diffusion signals, to obtain a video output signal. a signal processing circuit;
An audio signal processing circuit obtains an audio output signal by performing processing such as 4-phase DPSK demodulation or PCM demodulation on the audio signal that is the output signal of the M demodulation circuit; an adjustment signal generation circuit that generates an adjustment signal intermittently, and when adjusting the BS antenna, switches the adjustment signal that is the output signal of the adjustment signal generation circuit to the audio output signal of at least one channel of the audio signal processing circuit. The present invention provides a satellite broadcasting receiver characterized in that it is configured to include an adjustment switching circuit that outputs a signal.

(Embodiment) FIG. 1 is a block diagram showing a first embodiment of a satellite broadcasting receiver of the present invention. The same parts as in FIG. 5 are indicated by the same reference numerals.

The difference from the conventional satellite broadcasting receiver shown in FIG. 5 is that an adjustment switching circuit is provided, which is composed of an adjustment signal generation circuit 17 and switches 18 and 19, and a description of the same parts will be omitted below. The operations of the different parts will be explained below.

In FIG. 1, the AGC circuit 7 detects the amplitude of the supplied input signal, generates a DC AGC voltage corresponding to the amplitude, and controls the gain using the DC AGC voltage so that the amplitude of the output signal is constant. It is working as expected.

Therefore, it can be seen that the DC ΔGC voltage of the AGC circuit 7 is proportional to (or corresponds to) the signal level (field strength) of the input signal received by the BS antenna 1.

The direct current ΔGC power H- is taken out from the AGC circuit 7 and supplied to the adjustment signal generation circuit 17.

The adjustment signal generation circuit 17 is a voltage controlled oscillator (VCO)
etc., and generates a frequency adjustment signal corresponding to (or proportional to) the DC ΔGG voltage.

For example, when the DC AGC voltage is 1.5V, the signal level (field strength) of the input signal received by the BS antenna 1
If the voltage changes up to 5V at its maximum, then from 1kHz to 1
It generates a sinusoidal AC signal that varies up to 0kHz.

The adjustment signal, which is the output signal of the adjustment signal generation circuit 17, is supplied to the terminal 18b of the switch 18.19.

19b.

On the other hand, the audio output signals of the 2nd and 17th channels of the audio signal processing circuit 11 are sent to the terminals 18 of the switches 18 and 19, respectively.
a, 19a.

The switches 18 and 19 constitute an adjustment switching circuit and operate in conjunction with each other, and during normal operation, supply the two-channel audio output signal of the audio signal processing circuit 11 to the audio signal output terminal 12.13. When adjusting the installation of the BS antenna, the adjustment signal, which is the output signal of the adjustment signal generation circuit 17, is supplied to the audio signal output terminals 12 and 13.

The audio output signal from the audio signal output terminals 12 and 13 is connected to an external amplifier, speaker, etc., and the audio is reproduced.

Therefore, the adjustment method is to first switch the switches 18 and 19 to the adjustment side, that is, to the terminals 18b and 19b side, and make the sound from the speaker a little louder so that it can be heard even close to the BS amplifier buoy.

Next, the azimuth angle, elevation angle, etc. of the BS antenna 1 may be adjusted and set so that the frequency of the sound from the speaker becomes the highest frequency (for example, 10 kHz).

According to this adjustment method, adjustments can be made by listening to the sound obtained from the audio output signal of the BS tune, so there is no need for angle setting jigs such as DC voltmeters and cables, and anyone can do it without having to ask an installation adjustment company. A DC voltmeter that is adjustable, low cost, and can be used in high places.

Since there is no need to carry or connect cables, there is little danger, and the azimuth angle, elevation angle, etc. of the BS antenna can be easily set in a short time.

In this embodiment, it has been explained that the AGC circuit 7 has a maximum DC AGCm pressure when the input signal is maximum, but depending on the type of AGC circuit, the DC AGCm pressure may be the minimum, and the invention is not limited to this. isn't it.

Furthermore, although it has been explained that the frequency of the output signal of the adjustment signal generating circuit 17 increases when the input DC voltage is high, it goes without saying that the reverse may be true.

FIG. 2 is a block diagram showing a second embodiment of the satellite broadcasting receiver of the present invention. The same parts as in FIG. 1 are designated by the same reference numerals.

The difference from the satellite broadcasting receiver of FIG. 1 is that only one switch 18 is used instead of the two switches 18 and 19 in FIG. 1, and its operation will be explained below.

The adjustment method is to first switch the switch 18 to the adjustment side, that is, to the terminal 18b side, and make the sound from the speaker a little louder so that it can be heard even close to the BS antenna (=j).

Next, the azimuth angle, elevation angle, etc. of the BS antenna 1 may be adjusted and set so that the frequency of the sound from the speaker becomes the highest frequency (for example, 10 kHz).

At this time, the audio output signal of the other channel of the audio signal processing circuit 11 is constantly supplied to the audio output terminal 13, so that the audio signal of the broadcast received by the BS antenna can be heard at the same time. It is convenient to check the adjustment status.

Note that other operations and effects are completely the same as those of the first embodiment of the present invention shown in FIG. 1, so they will be omitted here.

FIG. 3 is a block diagram showing a third embodiment of the satellite broadcasting receiver of the present invention. The same parts as in FIG. 1 are designated by the same reference numerals.

The difference from the satellite broadcasting receiver in FIG. 1 is that an adjustment signal generation circuit 20 is used instead of the adjustment signal generation circuit 17 in FIG.
The operation is explained below.

The adjustment signal generation circuit 20 includes voltage controlled oscillators 21 and 23.
and a maximum voltage holding circuit 22.

The DC AGC voltage is taken out from the AGC circuit 7 and supplied to the voltage controlled oscillator 21 and maximum voltage holding circuit 22 of the adjustment signal generating circuit 20.

The voltage controlled oscillator 21 generates a frequency adjustment signal corresponding to (or proportional to) the DC AGC voltage.

For example, if the DC AGCm pressure changes from 1.5 to 5 V at the maximum signal level (field strength) of the input signal received by the BS antenna 1, then from 1 kHz to 10
It generates a sinusoidal AC signal that varies up to kHz.

The adjustment signal, which is the output signal of the voltage controlled oscillator 21, is supplied to the terminal 18b of the switch 18.

The maximum voltage holding circuit 22 is a circuit that holds the maximum voltage of the DC AGC voltage when the angle of the BS antenna is changed around. For example, in the above example, 5■ will be retained.

The holding voltage of the maximum voltage holding circuit 22 is supplied to a voltage controlled oscillator 23.

The voltage controlled oscillator 23 has the same configuration as the voltage controlled oscillator 21, and as described above, generates a 10 kHz sine wave AC signal for a voltage of 5 V, for example, and this signal is used as a reference signal during adjustment. used.

The output signal of the voltage controlled oscillator 23, for example 10kHz
The reference signal No. 2 is supplied to the terminal 19b of the switch 19.

On the other hand, the audio output signals of the two channels of the audio signal processing circuit 11 are transmitted to the terminals 18a of the switches 18 and 19, respectively.
, 19a.

Therefore, the adjustment method is to first switch the switches 18 and 19 to the adjustment side, that is, to the terminals 18b and 19b side, to make the sound from the speaker a little louder so that it can be heard even near the BS antenna.

Next, the azimuth angle, elevation angle, etc. of the BS antenna 1 are adjusted and set so that the frequency of the sound of one channel from the speaker is the same as the frequency of the sound of the other channel (for example, 10kHz) that can be heard at the same time. It will be a good thing if you do.

According to this adjustment method, the reference signals to be adjusted can be heard at the same time, making adjustment very easy.

In this embodiment, since the AGC circuit 7 has the maximum input signal, the maximum DC AGC voltage is maintained by the maximum voltage holding circuit 22. However, the present invention is not limited to this. Of course, it is sufficient to maintain the DC AGC voltage when the signal level of the input signal received by the BS antenna is at its maximum.

Further, other operations and effects are completely the same as those of the first embodiment of the present invention shown in FIG. 1, and therefore will not be described here.

FIG. 4 is a block diagram showing a fourth embodiment of the satellite broadcasting receiver of the present invention. The same parts as in FIG. 1 are designated by the same reference numerals.

The difference from the satellite broadcasting receiver in FIG. 1 is that an adjustment signal generation circuit 24 is used instead of the adjustment signal generation circuit 17 in FIG.
The operation is explained below.

The adjustment signal generation circuit 24 includes a voltage controlled oscillator 25, an oscillator 27, and a switch 26.

The DC AGC voltage is taken out from the AGC circuit 7 and supplied to the voltage controlled oscillator 25 of the adjustment signal generation circuit 24.

The voltage controlled oscillator 25 generates a frequency adjustment signal corresponding to (or proportional to) the DC AGC voltage.

For example, when the DC AGC voltage is 1.5V, the signal level (field strength) of the input signal received by the BS antenna 1
If it changes to the maximum of 5V, then from 20H to 2
A pulse signal that changes up to 00 H2 is generated.

The output signal of the voltage controlled oscillator 25 is supplied to the switch 26, and the switch is turned on and off at a cycle from 20H2 to 200H.

That is, when the signal level (field strength) of the input signal received by the BS antenna 1 is at its maximum, the cycle is at its minimum because it is intermittent at 200 H2, for example.

On the other hand, the oscillator 27 oscillates at a predetermined frequency, for example 1 kHz, and its output signal is sent via the switch 16 to the terminals 18b of the switches 18 and 19.

19b.

The switch 26 is turned on and off by the output signal of the voltage controlled oscillator 25.

On the other hand, the audio horn signals of the two channels of the audio signal processing circuit 11 are sent to the terminals 18 of the switches 18 and 19, respectively.
a, 19a.

Therefore, the adjustment method is to first switch the switches 18 and 19 to the adjustment side, that is, to the terminals 18b and 19b side, to make the sound from the speaker a little louder so that it can be heard even near the BS antenna.

Next, the azimuth angle, elevation angle, etc. of the BS antenna 1 may be adjusted and set so that the period of intermittent sound of 1 kHz from the speaker is minimized.

Although it has been explained that the frequency of the output signal of the voltage controlled oscillator 25 becomes high when the input DC voltage is high, it goes without saying that the reverse may also be true.

Further, in the fourth embodiment of the present invention shown in FIG. 4, both the output signals of the two channels of the audio signal processing circuit 11 are switched to the adjustment signal which is the output signal of the adjustment signal generation circuit 24 when adjusting the BS antenna. However, as in the embodiment shown in FIG. 2, it is of course possible to switch only one channel.

In this case, since the audio output signal of the other channel of the audio signal processing circuit 11 is always supplied to the 2/'l audio output terminal, the audio signal of the broadcast received by the BS antenna can be simultaneously received. can hear,
It is convenient to be able to check the adjustment status by TM.

Further, other operations and effects are completely the same as those of the first embodiment of the present invention shown in FIG. 1, and therefore will not be described here.

. (Effects of the Invention) The satellite broadcasting receiver of the present invention is configured as described above,
Adjustments can be made by listening to the sound obtained from the audio output signal of BS Tuner, so there is no need for DC voltage resistance, cables, or other angle setting jigs, and anyone can make adjustments without having to ask an installation adjustment contractor, and the cost is low. Moreover, there is no need to carry or connect DC voltmeters, cables, etc. to high places, so the danger of working at high places is reduced, and the azimuth angle, elevation angle, etc. of the BS antenna can be easily set in a short time. It has excellent practical effects.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a first embodiment of the satellite broadcasting receiver of the present invention, FIG. 2 is a block diagram showing a second embodiment of the satellite broadcasting receiver of the present invention, and FIG. 3 is a block diagram showing a second embodiment of the satellite broadcasting receiver of the present invention. FIG. 4 is a block diagram showing a third embodiment of the satellite broadcasting receiver of the present invention; FIG. 4 is a block diagram showing a fourth embodiment of the WJ star broadcasting receiver of the present invention;
FIG. 5 is a block diagram showing a conventional satellite broadcast receiver. 1... BS antenna, 2... BS converter, 3...
...Coaxial cable, 4...BS tuner, 5...B
S-IF signal input terminal, 6... frequency conversion circuit, 7.
..AGC circuit, 8.. FM demodulation circuit, 9.. video signal processing circuit, 10.. video signal output terminal, 11..
- Audio signal processing circuit, 12. 13... Audio signal output terminal, 14... BS converter power supply circuit, 15...
Level shifter terminal, 16...DC voltmeter, 17,2
0.24...Adjustment signal generation circuit, 18.19...
Switch (adjustment switching circuit), 21.23.25.
...Voltage controlled oscillator, 22... Maximum voltage holding circuit, 2
6... Switch, 27... Oscillator, C... Capacitor, L... Inductance. Patent applicant Kunio Kakiki, Representative of Victor Japan Co., Ltd.

Claims (3)

[Claims] (1) A BS-IF signal input terminal for inputting a BS-IF signal received by a BS antenna, frequency-converted and transmitted by a BS converter, and a frequency converter for converting the BS-IF signal to an intermediate frequency band. an AGC circuit that detects the amplitude of the output signal of the frequency conversion circuit, generates a DC AGC voltage corresponding to the amplitude, and controls the gain by the DC AGC voltage so that the amplitude of the output signal is constant. circuit, and an FM demodulator for FM demodulating the output signal of the AGC circuit to separate and output a video signal and an audio signal.
a demodulation circuit; a video signal processing circuit that performs processing such as de-emphasis and removal of energy diffusion signals on a video signal that is an output signal of the FM demodulation circuit to obtain a video output signal; and an output signal of the FM demodulation circuit. 4-phase DP audio signal
an audio signal processing circuit that performs processing such as SK demodulation and PCM demodulation to obtain an audio output signal; an adjustment signal generation circuit that generates an adjustment signal of a frequency corresponding to the DC AGC voltage; and an adjustment signal generation circuit that generates an adjustment signal of a frequency corresponding to the DC AGC voltage; A satellite broadcast receiver comprising: an adjustment switching circuit that switches and outputs an adjustment signal, which is an output signal of the signal generation circuit, with an audio output signal of at least one channel of the audio signal processing circuit. Machine. (2) A BS-IF signal input terminal for inputting a BS-IF signal received by a BS antenna, frequency-converted and transmitted by a BS converter, and a frequency converter for converting the BS-IF signal to an intermediate frequency band. an AGC circuit that detects the amplitude of the output signal of the frequency conversion circuit, generates a DC AGC voltage corresponding to the amplitude, and controls the gain by the DC AGC voltage so that the amplitude of the output signal is constant. circuit, and an FM demodulator for FM demodulating the output signal of the AGC circuit to separate and output a video signal and an audio signal.
a demodulation circuit; a video signal processing circuit that performs processing such as de-emphasis and removal of energy diffusion signals on a video signal that is an output signal of the FM demodulation circuit to obtain a video output signal; and an output signal of the FM demodulation circuit. 4-phase DP audio signal
an audio signal processing circuit that performs processing such as SK demodulation and PCM demodulation to obtain an audio output signal; and a frequency adjustment signal corresponding to the DC AGC voltage;
An adjustment signal generation circuit that holds the DC AGC voltage when the signal level of the input signal received by the BS antenna is maximum among the DC AGC voltages, and generates a reference signal of a frequency corresponding to the DC AGC voltage. and an adjustment switching circuit that switches and outputs the adjustment signal and reference signal, which are the output signals of the adjustment signal generation circuit, with the two-channel audio output signal of the audio signal processing circuit when adjusting the BS antenna. A satellite broadcasting receiver characterized in that it is configured as follows. (3) A BS-IF signal input terminal for inputting a BS-IF signal received by the BS antenna, frequency-converted and transmitted by the BS converter, and a frequency converter for converting the BS-IF signal to an intermediate frequency band. an AGC circuit that detects the amplitude of the output signal of the frequency conversion circuit, generates a DC AGC voltage corresponding to the amplitude, and controls the gain by the DC AGC voltage so that the amplitude of the output signal is constant. circuit, and an FM demodulator for FM demodulating the output signal of the AGC circuit to separate and output a video signal and an audio signal.
a demodulation circuit; a video signal processing circuit that performs processing such as de-emphasis and removal of energy diffusion signals on a video signal that is an output signal of the FM demodulation circuit to obtain a video output signal; and an output signal of the FM demodulation circuit. 4-phase DP audio signal
an audio signal processing circuit that performs processing such as SK demodulation and PCM demodulation to obtain an audio output signal; and an adjustment signal generation circuit that generates an adjustment signal in which a signal of a predetermined frequency is intermittent at a period corresponding to the DC AGC voltage. and an adjustment switching circuit that switches and outputs the adjustment signal that is the output signal of the adjustment signal generation circuit with the audio output signal of at least one channel of the audio signal processing circuit when adjusting the BS antenna. A satellite broadcast receiver featuring: