Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1975-11-03
1977-01-25
Richardson, Robert L.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
325418, 325422, 325464, 334 15, H04B 116
Patent
active
040052567
ABSTRACT:
A signal combining circuit for combining a tuning bias voltage and an automatic frequency control error voltage for application to a voltage controlled radio frequency tuning means for a television receiver is shown. The voltage controlled radio frequency tuning means has a non-linear frequency versus voltage characteristic and the signal combining circuit includes a resistance means for coupling the error voltage to the tuning means input in a manner that compensates for the non-linearity of the frequency versus voltage characteristic of the tuning means to provide a substantially constant automatic frequency control pull-in range throughout the frequency range of interest.
REFERENCES:
patent: 3828257 (1974-08-01), Puskas
patent: 3914696 (1975-10-01), Evans
patent: 3947772 (1976-03-01), Sato
patent: 3952143 (1976-04-01), Siwko
GTE Sylvania Incorporated
O'Malley Norman J.
Orner Robert T.
Richardson Robert L.
Walrath Robert E.
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