Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1990-04-30
1993-12-21
Groody, James J.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358 34, H04N 972
Patent
active
052725227
ABSTRACT:
Video signal processing circuit including a source of composite luminance signals having image-representative components separated by regularly recurring synchronizing signal components; keyed clamp and signal clipping circuit coupled to the luminance signal source and responsive to back porch keying pulses for clamping a back porch interval of the composite luminance signal to a predetermined direct voltage level, the keyed clamp and signal clipping circuit further including a voltage sensitive signal clipping circuit responsive to the direct voltage level and to the clamped composite luminance signals for removing synchronizing signal components from the composite components; chrominance signal processing circuit for demodulating a color subcarrier signal to produce a plurality of color difference signals; a source of keying pulses recurring during the synchronizing signal interval; and a plurality of keyed clamp circuits each responsive to the synchronizing signal interval keying pulses and individually responsive separately to one of the demodulated color difference signals and the image-representative luminance signal for clamping each of the color difference and image-representative luminance signals to a common voltage reference level.
REFERENCES:
patent: 4183050 (1980-01-01), Tsuchiya et al.
patent: 4458263 (1984-07-01), Schutte
patent: 5010395 (1991-04-01), Tsuji et al.
Fernseh-Empfangstechnik. Peter Zastrow, copyright 1983 by Frankfurter Fachverlag Michael Kohl GmbH & Co. KG, Frankfurt am Main, Germany (translation).
Emanuel Peter M.
Groody James J.
Harvey David E.
Thomson Consumer Electronics Inc.
Tripoli Joseph S.
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