Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1979-12-03
1981-04-21
Martin, John C.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
H04N 514
Patent
active
042636167
ABSTRACT:
A method and apparatus is disclosed for peaking the amplitude transitions of an information-bearing signal such as a video signal. From the video signal, a control signal and a peaking signal are developed, each having magnitude variations related to and occurring in time correlation with amplitude transitions in the video signal. The control signal is employed to modulate the peaking signal such that when transitions in the control signal exceed a threshold amplitude, the peaking signal is coupled to an output terminal at or above a given gain level, and when the transitions in the control signal are less than the threshold amplitude, the peaking signal is coupled to an output terminal at a reduced but non-zero gain level. The modulated peaking signal appearing at the output terminal is combined with the video signal to cause relatively high level video transitions to receive a high level of peaking and relatively lower level video transitions to receive lesser peaking.
REFERENCES:
patent: 4030121 (1977-06-01), Faroudja
patent: 4081836 (1978-03-01), Skinner
patent: 4164758 (1979-08-01), Kowal
Martin John C.
Zenith Radio Corporation
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