Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1980-05-06
1982-01-26
Masinick, Michael A.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358148, 358153, H04N 506
Patent
active
043131379
ABSTRACT:
An integratable vertical sync separator is described for use in a television receiver. The preferred embodiment includes an integrated capacitor which is charged and alternately discharged by current sources in response to composite sync pulses such that the capacitor develops a relatively high level voltage when vertical sync pulses are received. The voltage developed by the capacitor is sensed by a peak detector for developing a vertical sync output pulse and for producing a feedback signal indicative of the amplitude of the relatively high level voltage on the capacitor. The feedback signal is applied to the current sources which are conditioned to vary the charge and discharge rates of the capacitor for improved performance in sub-standard signal conditions.
REFERENCES:
patent: 3527888 (1970-09-01), Clapp
patent: 4185299 (1980-01-01), Harford
patent: 4237487 (1980-12-01), Ikeda
patent: 4238769 (1980-12-01), Rzeszewski
Coult John H.
Masinick Michael A.
Moore John H.
Zenith Radio Corporation
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