Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1985-10-30
1988-08-02
Ng, Jin F.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
455209, 455260, 455316, 455186, H04B 126
Patent
active
047618256
ABSTRACT:
A method of reducing terrestrial interference is provided for a TVRO earth station receiver comprising a super-heterodyne circuit including a voltage-controlled oscillator (VCO), a mixer for combining incoming first IF signals with the output of the VCO to reduce the frequency of the first IF signals to a second IF range having a predetermined nominal center frequency, a pass band filter for filtering the second IF signals and having a pass band centered on the nominal second IF center frequency, and a microprocessor for controlling the input voltage to the VCO and for automatically setting the controlling input voltage at prescribed levels in response to a "channel select" command signal, so that the VCO produces an output frequency which centers the received signal for a selected channel on the nominal second IF center frequency. The method includes offsetting the controlling input voltage from the prescribed level for a selected channel to offset the actual second IF center frequency relative to the center of the pass band of the filter, in a direction that removes at least a portion of the terrestrial interference from the pass band.
REFERENCES:
patent: 3639840 (1972-02-01), Shekel et al.
patent: 4198604 (1980-04-01), Holdaway
patent: 4267605 (1981-05-01), Matsuzawa et al.
patent: 4479257 (1984-10-01), Akiyama
patent: 4512035 (1985-04-01), Victor et al.
patent: 4545072 (1985-10-01), Skutta et al.
patent: 4551856 (1985-11-01), Victor et al.
patent: 4661995 (1987-04-01), Kashiwagi
Capetronic (BSR) Ltd.
Ng Jin F.
Rudisill Stephen G.
Seidenglane Elissa
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