JP2573987B2 - Receiver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a satellite broadcast radio wave output in an FM modulation format, and a VHF and UHF band television broadcast output in an AM modulation format. Radio wave or CATV (cable, antenna,
(Television) signal and an easy-to-use receiving apparatus capable of receiving the same.

[Prior Art] Satellite broadcast signal transmitted by cable after down-converting FM-modulated SHF band satellite broadcast signal (12GHz band) to UHF band or 1GHz band intermediate frequency signal When receiving an AM-modulated VHF / UHF band TV broadcast (including CATV signals) with a general receiving system, each broadcast signal has a different frequency band, so different receiving circuits are required. Becomes very complicated, and the operation becomes complicated.

As a receiving apparatus for receiving satellite broadcasting and TV broadcasting with a single system of receiving system, as described in JP-A-57-39628, it converts a satellite broadcasting signal into a UHF or VHF band empty channel frequency. There is known an apparatus which receives a broadcast signal together with a TV broadcast signal.

Japanese Patent Application Laid-Open No. 62-128690 discloses that a single frequency converter outputs a TV-IF signal when a TV broadcast signal is input, and outputs a satellite broadcast signal when a satellite broadcast signal (downconverted to 1 GHz) is input. A TV tuner that outputs a 400 MHz band satellite broadcast IF signal is known.

[Problems to be solved by the invention]

In the above conventional devices, when receiving satellite broadcasting and TV broadcasting, it is difficult to switch the variable filter to the wideband characteristics with UHF and VHF band TV broadcasting receivers at the time of receiving satellite broadcasting, and it is also possible to use a cable transmission system in apartment buildings etc. When distributed transmission
Satellite broadcast signal band (for example, if the satellite broadcast signal is a signal downconverted to the UHF band, the UHF band)
When the satellite broadcasting signal is down-converted to the 1 GHz band, the satellite broadcasting signal is converted to the 1 GHz band. There is also a problem that reception is not possible.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and to provide a receiving apparatus which can receive broadcasts in common with a simple configuration, has a good band characteristic, and has little disturbance due to an oscillation signal or the like.

[Means for solving the problem]

The above purpose is to use a double superheterodyne tuner as a receiving circuit, and when receiving broadcast waves in the VHF and UHF bands, perform frequency conversion by double
A 1IF signal (first intermediate frequency signal) is obtained, and when receiving a down-converted satellite broadcast signal, a frequency band different from the first IF frequency when receiving a VHF or UHF band broadcast wave of a double superheterodyne tuner. This is achieved by using the first local oscillator and the first frequency converter for both purposes.

[Action]

VH using a double superheterodyne tuner
F and UHF band broadcast signals are up-converted to the first intermediate frequency, and at the time of satellite broadcast signal reception, the frequency is converted to a different intermediate frequency band, the first local oscillation frequency is set higher than the transmission band, and the input terminal of the oscillation signal is leaked. In addition to eliminating interference with other receiving systems, a fixed BPF (band filter) is used to obtain a stable IF-converted signal with a wideband characteristic and to obtain a good signal.
By using a part of the reception system and the channel selection system of the F and VHF receivers for receiving the satellite broadcast signal, a receiver having a simple configuration can be obtained.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing a receiving apparatus as a first embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a satellite broadcast signal (a signal obtained by down-converting a signal of a 12 GHz band from a satellite to, for example, a 1 GHz band by a converter not shown), 2 denotes an input terminal of a VHF, UHF, or CATV broadcast signal; 3 is an input bandpass filter (BPF), 4 is a high frequency amplifier, 5 is a first frequency converter, 6 is a first local oscillator, 7 is a duplexer,
8 is a first IF / BPF, 9 is a first IF amplifier, 10 is a second frequency converter, 11 is a second local oscillator, 12 is a second IF amplifier, and 13 is a second IF amplifier.
IF / BPF, 14 is IF signal output terminal for VHF, UHF, CATV signal, 1
5 is a 3rd IF preamplifier, 16 is a 3rd IF / BPF SAW (surface acoustic wave filter), 17 is a 3rd IF postamplifier, 18 is a satellite broadcast signal IF output terminal, 19 is a tuning control unit, and 20 is a reference. An oscillator, 21 is a tuning voltage control circuit, and 22 is a tuning signal input terminal.

The VHF, UHF, and CATV broadcast signals from the terminal 2 are signals output from the tuning control unit 19 in accordance with tuning data (instruction of which of VHF, UHF and CATV to receive) from the tuning signal input terminal 22. The desired band (VHF or UHF or CATV band) by switching the band filter characteristics with input BPF3
Only the band is selected and reaches the high-frequency amplifier 4. Then, after being band-selectively amplified there, it is up-converted by being mixed by the first frequency converter 5 with the oscillation signal of the first local oscillator 6 that performs voltage-controlled variable oscillation, and is split by the splitter 7 as the first IF frequency component. The band is selected as a signal for one channel of TV broadcasting by the first IF / BPF 8, amplified by the first IF amplifier 9, and then mixed with the oscillation signal of the second local oscillator 11 by the second frequency converter 10. As a result, the signal is down-converted, and then output as an IF signal from the terminal 14 via the second IF amplifier 12 and the second IF / BPF 13.

When a satellite broadcast signal is received, a signal is input from the terminal 1 and channel selection data to that effect is input from the terminal 22. , And only the satellite broadcast signal reaches the high-frequency amplifier 4. Then, after band selective amplification there, it is down-converted by the first frequency converter 5 and extracted as the third IF frequency by the splitter 7,
The signal is output as an IF signal from an output terminal 18 through a third preamplifier 15, a third IF / BPF 16, and a third postamplifier 17.

In the above reception operation, the frequency of the oscillation signal from the first local oscillator No. 6 is determined based on the oscillation signal of the reference oscillator 20.
It is a matter of course that the tuning frequency is controlled by the tuning voltage control circuit 21 and set to a frequency corresponding to the tuning reception channel by the function of the tuning control unit 19 which receives the tuning data from the terminal 22.

In the embodiment of FIG. 1, signals in the VHF, UHF, and CATV broadcast frequency bands are about 91.25 to 765.25 MHz, and satellite broadcast signals are 1 GHz.
Since the signal downconverted to the band is assumed, it is about 1.03 to 1.32 GHz. Demultiplexer 7 to 1st IF / BPF8
The first IF frequency (f _IF1 ) going to 1710 MHz, the second IF frequency (f _IF2 ) going from the second frequency converter 10 to the second IF amplifier 12
Oscillates in a band of 58.75 MHz, the third IF frequency (f _IF3 ) from the duplexer 7 to the third IF preamplifier 15 is 402.78 MHz, and the oscillation frequency (f _0SC1 ) of the first local oscillator 6 is 1.43 to 2.475 GHz. In addition, the oscillation frequency (f _0SC2 ) of the second local oscillator 11 is 1
The fixed oscillation frequency is 651.25 MHz.

For example, when one domestic channel of a 91.25 MHz TV is received, the reception frequency (f _RE ) = 91.25 MHz and f _0SC1 = 181
At 0.25MHz, the first and up-converted to f _IF1 = 1710MHz 2
Down-convert to f _IF2 = 58.75 MHz at the local oscillation signal frequency.

On the other hand, the satellite (BS-1) channel (f _RE
≒ 1049.48MHz) when receiving the set to f _0SC1 = 1452.48MHz, obtain f _IF3 = 402.78MHz as down-conversion.

As described above, in this embodiment, the tuning control unit 19, the first local oscillator 6, the first frequency converter (mixer) 5, the RF amplifier 4
Is used for both satellite broadcast reception and TV broadcast reception, has a simple circuit configuration, and has a transmission frequency of VHF, UHF,
It does not overlap when receiving any signal in the satellite broadcasting signal frequency band, does not interfere with other receivers, and is stable because it uses a dedicated fixed filter 16 (SAW / BPF) for satellite broadcasting This has the advantage that a simple reception can be performed.

In the first embodiment, the frequency of the satellite broadcast signal is set to 1.05 to 1.38.
I assumed that it was down-converted to GHz,
When receiving a satellite broadcast signal by a method of down-converting and transmitting the satellite broadcast signal to the 765 MHz UHF band,
One _IF frequency f _IF1 is set to 955 MHz. The third IF frequency f _IF3 is 402.
The oscillation frequency f _0SC1 of the first local oscillator 6 _{remains unchanged at 78 MHz.}
Oscillates in the f _0SC1 = 893 to ₁₇₂₁ MHz band.

As in the case of the above-described reception operation, when a domestic one-channel TV broadcast signal is received, f _0SC1 = 1046.25 MHz and signal processing is performed as an up-conversion after the first IF / BPF.
When receiving (BS-1) channel (f _RE = 483.5 MHz), f
_0SC1 = 893.5MHz signal and 3rd IF as down conversion
The band processing is performed in the amplifier 15 and thereafter.

FIG. 2 is a block diagram showing a receiving apparatus according to a second embodiment of the present invention. In the figure, 31 is a fourth IF amplifier, 32 is a third frequency converter, 34 is a high frequency switch, the first intermediate frequency f _IF1 = 1710 MHz, the second local oscillator 11
Oscillation frequency f _0SC2 = 1651.25 MHz, second intermediate frequency f _IF2
= 58.75 MHz and the third intermediate frequency _fIF3 = 402.78 MHz.

VHF, UHF, when receiving a CATV signal, performs the same receiving operation in the embodiment shown in FIG. 1 has selected the fourth intermediate frequency f _IF4 = 2,054.03MHz when receiving satellite signals Even when receiving a signal obtained by converting a satellite broadcast into a UHF band or receiving a signal obtained by converting a signal into a 1 GHz band, it is configured to be receivable by switching with the changeover switch 34.

For example, when receiving a signal of the (BS-1) channel in the UHF band, the reception frequency f _RF = 480 MHz, the oscillation frequency f _0SC1 of the first local oscillator 6 = 2534.03 MHz, and the fourth intermediate frequency f _IF4 = 2
Up-converted to 054.03 MHz, down-converted by the third frequency converter 32 at the oscillation frequency f _0SC2 = 1,651.25 MHz of the second local oscillator 11 to obtain a third IF frequency of 410 MHz,
After the IF amplifier 15, signal amplification and band selection are performed and a signal is output. At this time, the frequency change range of the first local oscillator 6 is about 2.54 to 2.81 GHz.

In the case where the satellite broadcast signal converted to the 1 GHz band is received and transmitted, the high-frequency switch 34 is switched to the broken line side and the third IF frequency (410 MHz) is directly input to the third preamplifier 15 from the duplexer 7. Thus, an IF signal at the time of receiving satellite broadcasting is obtained. At this time, the oscillator frequency of the first local oscillator 6 is 1.
It is 41 to 1.73 GHz, and the oscillation frequency changes about 1.41 to 2.81 GHz when VHF and UHF broadcast reception is considered.

According to the present embodiment, not only VHF and UHF broadcast signals, but also when receiving a satellite broadcast signal in the UHF band or a frequency converted to a 1 GHz band, either signal can be easily received by the changeover switch. Has advantages.

FIG. 3 is a block diagram showing a receiving apparatus according to a third embodiment of the present invention. In the figure, reference numeral 40 denotes an RF signal switching circuit, and reference numeral 45 denotes a fourth frequency conversion circuit. In this embodiment, in the embodiment shown in FIG. 1, in the embodiment shown in FIG. The circuit 45) is characterized by the fact that the frequency conversion operation as a satellite broadcast signal frequency band can be optimized, the conversion efficiency and the noise figure can be improved, and the S / N of the receiving system can be improved. Has advantages.

FIG. 4 is a block diagram showing a receiving apparatus as a fourth embodiment of the present invention, and shows a circuit configuration including a demodulation unit of a satellite broadcast signal. In FIG. 4, reference numeral 50 denotes an FM modulation signal demodulation unit, which includes a voltage control oscillator 51, a phase comparator 52, a loop filter 53, a second station oscillation frequency control circuit 54, and a frequency control switch 55. Circuit, 56 is an AGC detection circuit, 57 is an AGC amplification circuit, 58 is an oscillation signal amplification and multiplication circuit, 60 is a demodulation circuit for VHF and UHF TV broadcast signal AM modulation signal, 61 is an AGC detection and amplification circuit for AM demodulation signal, 70 is An RF / AGC switching circuit, 80 is a demodulation output terminal of a satellite broadcast signal, and 81 is a demodulation output terminal of an AM modulation signal of UHF and VHFTV broadcasting.

As a frequency of the embodiment shown in FIG. 4, as a satellite broadcast signal, 1.03 to 1.32 GHz, a first intermediate frequency f _IF1 = 1.71 Hz,
The second local oscillation frequency f _0SC2 = 1651.25 MHz, the second intermediate frequency f _IF2 = 58.75 MHz, and the third intermediate frequency f _IF3 = 402.78 MHz.

The FM modulation signal demodulation unit 50 performs FM demodulation in a PLL circuit configuration, and the output of the loop filter 53 is a demodulated output. At this time, the frequency control switching circuit 55 switches so that the output of the loop filter 53 is connected to the voltage controlled oscillator 51. Also
AGC detection circuit 56 detects and integrates the demodulated signal with the detected signal and AGC
After amplification by the amplifier circuit 57, the third IF post-amplifier 17 and the RF amplifier 4
The gain is controlled. At this time, the oscillation frequency of the voltage-controlled oscillator 51 shifts its frequency around about 402.78 MHz according to the FM modulation signal.

For receiving VHF and UHF broadcast signals, FM modulation signal demodulation unit 50
Is switched to the second local oscillation frequency control circuit 54 side, and the second local oscillation frequency control circuit 54 changes the oscillation frequency of the voltage control oscillator 51 based on the reference oscillator 20.
Fixed to 412.825MHz.

1651.25MHz by multiplying by 4 by the oscillation signal amplification and multiplication circuit 58
The second local oscillation signal is obtained and the second IF
A signal having a frequency of 1710 MHz is down-converted to obtain a signal having a second IF frequency of 58.75 MHz, demodulated by an AM signal demodulation circuit 60, and a demodulated signal is output from a terminal 81. AGC detection and amplification circuit 61
Is applied to the RF amplifier 4 via the AGC switching circuit 70 to control the gain.

In the present embodiment, the second local oscillator of the double super tuner is also used as the voltage controlled oscillator 51 of the PLLFM demodulation circuit, and the second local oscillation frequency is stabilized, so that a simpler circuit configuration can be obtained. .

In the embodiment of the present invention shown in FIG. 4, when the first IF frequency f _IF1 and the third IF frequency f _IF3 are both set to 950 MHz and a signal obtained by down-converting the satellite broadcast signal to the UHF band is received, the signal is _divided in FIG. The oscillator 7 can be a high-frequency switching circuit, and the oscillation signal amplifying / multiplying circuit 58 can be configured to directly apply the original oscillation signal of 950 MHz to the second frequency converter 10 without multiplying the same, thereby achieving reception with less spurious response. It becomes possible.

Further, in the present embodiment, the oscillation frequency of the voltage controlled oscillator 51 set to the center frequency of the PLL demodulation circuit is multiplied and used. Conversely, the oscillation which is close to the second local oscillation frequency is performed and the phase of the divided signal is compared. The same demodulation operation can be performed even when the output of the loop filter is applied to the control terminal of this voltage controlled oscillator to the amplifier 52, and when receiving UHF and VHF signals, there is an advantage that reception and demodulation with less spurious can be performed. .

FIG. 5 is a block diagram showing a receiving apparatus according to a fifth embodiment of the present invention. The basic operation of this embodiment is the same as that of the embodiment shown in FIG. In FIG. 5, reference numeral 90 denotes a first local oscillator, which is a voltage-controlled oscillator whose oscillation frequency band can be switched.

Although the receiving apparatus of FIG. 1 can receive only when the down-converted frequency band of the satellite broadcast signal is either the UHF band or the 1 GHz band, in the present embodiment shown in FIG. Reception is possible in any case by switching the oscillation frequency band by the switching signal. 1st IF frequency f _IF1 171
When 0 MHz and the third IF frequency f _IF3 are 402.78 MHz, VHF and U
When receiving an HF signal, the first local oscillation frequency 90 is about 1.8
When receiving a satellite broadcast signal down-converted to a band of up to 2.47 GHz and 1 GHz, the first local oscillation frequency f _0SC1 is approximately
The oscillation at 1.43 GHz to 1.73 GHz and the oscillation at 1.43 GHz to 2.47 GHz are performed continuously.

When receiving a satellite broadcast signal converted to the UHF band, switch the oscillation frequency band and set the oscillation frequency f _0SC to about 0.89 to 1.17GH.
The oscillation frequency is set to z. As a result, both the UHF band and the satellite broadcast signal converted into the 1 GHz band can be received by the receiver having a simple circuit configuration.

Although the circuit configuration is increased in the embodiment of FIG. 5, the same effect can be obtained by switching the first local oscillation circuit 90 between two voltage-controlled oscillators that oscillate at different frequencies.

In the embodiment described above, the operation has been described by limiting the first IF frequency to the fourth IF frequency. However, it goes without saying that the same effect can be obtained at other frequencies without being limited to these frequencies.

Also, the case where the satellite broadcast signal is transmitted after being converted to the 1 GHz band or the UHF broadcast band is shown. However, when the satellite broadcast signal is down-converted to the VHF hyper band and transmitted, only the oscillation frequency band of the first local oscillation frequency is changed. Receivable.

〔The invention's effect〕

As described above, according to the present invention, using a double superheterodyne tuner, VHF and UHF band broadcast signals are up-converted to the first intermediate frequency, and when receiving a satellite broadcast signal, converted to a different frequency band and fixed by a fixed filter. By performing band selection and signal processing, the oscillation signal can be set higher than the reception frequency band,
Interference to other receivers is small, and an IF signal having a stable band characteristic at the time of receiving a satellite broadcast signal can be obtained. In addition, the first local oscillator, the RF amplifier, the first frequency converter, and the tuning circuit are also used. By using this, a receiving device having a simple configuration can be obtained.

[Brief description of the drawings]

1 to 5 are block diagrams each showing an embodiment of the present invention. Description of reference numerals 1,2 ... input terminal, 3 ... input bandpass filter, 4
…… High-frequency amplifier, 5 …… First frequency converter, 6,90 ……
1st local oscillator, 7 ... demultiplexer, 8 ... 1st IF / BPF, 10
... Second frequency converter, 11 second local oscillator, 16
Third IF / BPF, 19: Tuning control unit, 32: Third frequency converter, 50: FM modulation signal demodulation unit, 51: Voltage controlled oscillator,
52 ... Phase comparator, 53 ... Loop filter, 58 ... Oscillation amplification multiplier circuit.

Claims (3)

(57) [Claims] A first terminal (1) for receiving a satellite broadcast signal whose reception frequency band has been converted to a UHF broadcast wave band or a 1 GHz band, a VHF band, a UHF band television broadcast signal or
A second terminal (2) to which a CATV signal (hereinafter, these television signals are collectively referred to simply as a television signal) is input, and a satellite broadcast signal from the first terminal (1).
A television signal is input from the second terminal (2), and an input band-pass filter (3) for outputting one of the television signals, a first local oscillator (6), and the input filter (3). And a first frequency conversion circuit (5) which receives the output signal of the first local oscillator (6) and the oscillation signal from the first local oscillator (6), and converts the frequency by mixing the two to output the first frequency conversion circuit (5). ) Is the first intermediate frequency signal (an intermediate frequency signal generated by mixing the television signal and the oscillation signal from the first local oscillator (6)), but the third intermediate frequency signal (An intermediate frequency signal generated by mixing the satellite broadcast signal converted into the UHF broadcast wave band and the oscillation signal from the first local oscillator (6)) or a fourth intermediate frequency signal (1 GHz band). Converted to the above A demultiplexing circuit (7) that outputs the signal according to whether the signal is an intermediate frequency signal generated by mixing a satellite broadcast signal and an oscillation signal from the first local oscillator (6), and a second local oscillator (11 ), And a first intermediate frequency signal from the demultiplexing circuit (7) and an oscillation signal from the second local oscillator (11) are input and mixed by mixing the two to produce a second intermediate frequency signal. An output second frequency conversion circuit (10), a fourth intermediate frequency signal from the demultiplexing circuit (7), and an oscillation signal from the second local oscillator (11) are input and mixed to obtain a frequency. A third frequency conversion circuit (32) for converting and outputting as a third intermediate frequency signal, a third intermediate frequency signal directly output from the demultiplexing circuit (7), and an output from the third frequency conversion circuit (32) What is the third intermediate frequency signal Or a switch circuit for selecting and outputting (34), UH and a fixed filter which is input the output of the switch circuit (34) (16), or to receive the television signal, the reception frequency band
An instruction to receive a satellite broadcast signal converted to the F broadcast wave band or to receive a satellite broadcast signal converted to the 1 GHz band is given, and the frequency of the input band-pass filter (3) is accordingly adjusted. Switching the characteristics and controlling the oscillation frequency of the first local oscillator (6) when receiving the television signal, the first frequency conversion circuit (5) converts the input television signal to the first local oscillator (5). (1) the first local oscillator (6) for up-converting to an intermediate frequency for output and receiving a satellite broadcast signal whose reception frequency band has been converted to a UHF broadcast wave band;
The first frequency conversion circuit (5) controls the input satellite broadcast signal to the fourth frequency conversion circuit (5).
The frequency is converted to an intermediate frequency and output. The signal is further input to the third frequency conversion circuit (32) via the duplexer (7), and the signal converted into the third intermediate frequency signal is converted therefrom. When the switch circuit (34) is switched to one side and output to the fixed filter (16) and a satellite broadcast signal whose reception frequency band is converted to a 1 GHz band is received, the first local oscillator (6 ), The input satellite broadcast signal is frequency-converted into a third intermediate frequency in the first frequency conversion circuit (5) to be output. ) Is output through the switch circuit (34).
And a tuning control unit (19) for switching the signal to the other side and outputting the signal to the fixed filter (16). 2. The receiving device according to claim 1, wherein a voltage controlled oscillator (51) is provided as a demodulation circuit for demodulating a third intermediate frequency signal output from the fixed filter (16).
A phase comparator (52) to which a third intermediate frequency signal output from the fixed filter (16) and an output of the voltage controlled oscillator (51) are input, and a phase difference output from the phase comparator (52) And a loop filter (53) for sending a control output to the voltage controlled oscillator (51) so that the phase difference becomes zero.
And when a television signal is received without receiving a satellite broadcast signal, the voltage-controlled oscillator (51) is switched to serve also as the second local oscillator (11). A receiving device comprising a circuit (55). 3. A first receiving means for receiving a satellite broadcast signal having a received frequency band down-converted and converted into an intermediate frequency signal.
And a second terminal (2) to which a television broadcast signal or a CATV signal of the VHF band or the UHF band (hereinafter, these television signals are collectively referred to simply as a television signal) are inputted. An input bandpass filter (3) for receiving a satellite broadcast signal from a first terminal (1) and a television signal from the second terminal (2) and outputting either one of them; a first local unit; An oscillator (6), a first frequency conversion circuit for inputting an output signal from the input filter (3) and an oscillation signal from the first local oscillator (6), mixing the two, and converting and outputting the frequency; And (5) an output signal from the first frequency conversion circuit (5) is generated by mixing a first intermediate frequency signal (the television signal and an oscillation signal from a first local oscillator (6)). Intermediate frequency signal Signal) or a third intermediate frequency signal (an intermediate frequency signal generated by mixing the satellite broadcast signal and the oscillation signal from the first local oscillator (6)).
, A second local oscillator (11), and a first splitter from the splitter (7).
A second frequency conversion circuit (10) that receives an intermediate frequency signal and an oscillation signal from the second local oscillator (11), converts the frequency by mixing the two, and outputs the resultant as a second intermediate frequency signal; A filtering filter (16) to which a third intermediate frequency signal from the wave circuit (7) is input; and an instruction to receive the television or the satellite broadcast signal. By switching the frequency characteristic of the pass filter (3) and controlling the oscillation frequency of the first local oscillator (6) when receiving a television signal,
The frequency conversion circuit (5) up-converts the input television signal to a first intermediate frequency and outputs the converted signal, and when receiving a satellite broadcast signal, controls the oscillation frequency of the first local oscillator (6). In this case, the first frequency conversion circuit (5) includes a channel selection control unit (19) for converting the frequency of the input satellite broadcast signal into a third intermediate frequency and outputting the converted signal. In the receiving device, the tuning control unit (19) further includes a satellite broadcast signal in which a reception frequency band is converted to a UHF broadcast wave band or a 1 GHz band. It is informed whether it is a satellite broadcast signal, and accordingly, UHF broadcast wave band or 1GHz
The oscillating frequency of the first local oscillator (6) is controlled so that, regardless of which of the satellite broadcast signals converted into the band is received and input, the signal is converted to the third intermediate frequency. A receiving device, characterized in that: