Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1981-04-20
1982-09-21
Richardson, Robert L.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
H04N 514
Patent
active
043510035
ABSTRACT:
A circuit for automatically controlling the high frequency peaking content of an image representative video signal processed in the luminance signal path of a television receiver is disclosed. The luminance path also includes a linear phase network for generating a peaking signal which is added to the video signal for accentuating high frequency video signal components. The control circuit forms a closed feedback loop with the peaking network. The control circuit develops a control voltage in response to the high frequency content of the video signal, including peaking components already present in the video signal and as imparted from the peaking network. The control voltage controls the level of the locally generated peaking component to maintain the overall peaking content of the video signal within desired limits. A viewer adjustable peaking preference control is included in the feedback loop to tailor the response of the automatic peaking control network with respect to a desired level of signal peaking in accordance with the setting of the preference control.
REFERENCES:
patent: 3800077 (1974-03-01), Smith
patent: 3919714 (1975-11-01), Bingham
patent: 3984631 (1976-10-01), Avicola
patent: 4075661 (1978-02-01), Heffron
patent: 4080627 (1978-03-01), Wheeler
patent: 4081836 (1978-03-01), Skinner
Kurdyla Ronald H.
Meagher William H.
RCA Corporation
Richardson Robert L.
Whitacre Eugene M.
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