Telecommunications – Receiver or analog modulated signal frequency converter – Frequency modifying or conversion
Patent
1985-10-30
1988-01-05
Griffin, Robert L.
Telecommunications
Receiver or analog modulated signal frequency converter
Frequency modifying or conversion
455316, 455340, 455307, 455266, 333175, H04B 126
Patent
active
047181176
ABSTRACT:
A TVRO receiver for receiving frequency-modulated video signals, the receiver comprising a tuner including a superheterodyne circuit having a voltage-controlled oscillator (VCO), means for supplying a controlling input voltage to the VCO, and a mixer for combining incoming 1st IF signals with the output of the VCO to reduce the frequency of the 1st IF signals to a 2nd IF frequency which is sufficiently high to permit the output frequency of the VCO to be above the frequency range of the 1st IF signals, and a linear phase passband filter for passing a single video channel in the 2nd IF output from the mixer, the filter producing an output which is at least about 10 dB down from its peak at both +10 MHz and -10 MHz from the center of the passband of the filter.
REFERENCES:
patent: 3737801 (1973-06-01), Adams et al.
patent: 4153887 (1979-05-01), Poppa
patent: 4267605 (1981-05-01), Matsuzawa et al.
patent: 4322856 (1982-03-01), Ohta et al.
patent: 4512035 (1985-04-01), Victor et al.
patent: 4545072 (1985-10-01), Skutta et al.
Houston Albert C.
Ma John Y.
Capetronic (BSR) Ltd.
Griffin Robert L.
Rudisill Stephen G.
Seidenglanz Elissa
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