Receiver for satellite broadcasting service

Details Receiver for satellite broadcasting service Receiver for satellite broadcasting service

1985-09-13

1987-04-14

Ng, Jin F.

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

455192, 455208, 455265, 358188, H04B 116

Patent

active

046584382

ABSTRACT:
In a receiver for satellite broadcasting service, a selected audio subcarrier is converted into an IF signal demodulated into a demodulated signal which is applied to a feedback voltage generating means which converts the applied signal into a feedback voltage at a voltage ratio corresponding to the maximum frequency deviation of the selected audio subcarrier. The feedback voltage is applied by an operational amplifier to a varactor diode in a voltage-controlled oscillator. The oscillation frequency of the voltage-controlled oscillator is therefore varied dependent on the frequency deviation of the selected audio subcarrier to cause the maximum frequency deviation of the IF signal from a frequency mixer to match the bandwidth of a bandpass filter.

REFERENCES:
patent: 3421090 (1969-01-01), Fitch et al.
patent: 3991371 (1976-11-01), Shelby
patent: 4293818 (1981-10-01), Jarger
patent: 4601061 (1986-07-01), Carney et al.
"A 12-GHz Low Cost Earth Terminal for Direct TV Reception from Broadcast Satellites" by Douville 12/77.

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