Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1978-12-11
1980-12-16
Bookbinder, Marc E.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
331 36C, 3581951, 455164, 455169, 455182, 455192, 455262, H03J 726, H04B 126
Patent
active
042401151
ABSTRACT:
A channel selection voltage generator comprises a tuning voltage generator circuit having a capacitor for supplying a tuning voltage to an electronic tuner, a first constant current source for constantly discharging the capacitor at a first constant current and a second constant current source adapted to be rendered selectively in an operative state and in an inoperative state for selectively charging the capacitor at a second constant current which is higher than the first constant current, a frequency discrimination circuit for producing a discrimination signal representative of the amount of frequency deviation when a tuning voltage deviates from a receiving frequency, a buffer circuit for producing a binary "1" level signal when the discrimination signal is higher than a predetermined value and producing a binary "0" level signal when the discrimination signal is lower than the predetermined value, and a control circuit for causing the second constant current source to assume the inoperative state when the binary signal is at "0" level and causing the second constant current source to assume the operative state when the binary signal is at "0" level, the control circuit serving to maintain the second constant current source in the operative state or the inoperative state irrespective of the level of the binary signal during the frequency sweep.
REFERENCES:
patent: 3943449 (1976-03-01), Hendrickson et al.
patent: 3968441 (1976-07-01), Garskamp
patent: 3980968 (1976-09-01), Ma
patent: 4009442 (1977-02-01), von Bromssen
Bookbinder Marc E.
Hitachi , Ltd.
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