Television – Image signal processing circuitry specific to television – Color killer
Patent
1995-06-07
1997-08-05
Peng, John K.
Television
Image signal processing circuitry specific to television
Color killer
348643, H04N 970
Patent
active
056547692
ABSTRACT:
An automatic color control and chroma killer circuit 3 and video processing system is provided that is capable of controlling an amplitude of a color signal and of performing a killer function with a simple construction without using a divider and/or vertical filter. The ACC/ACK device includes ACC and ACK circuitry which may be selectively enabled with operating signals to a selector 27. When the selector 27 enables amplitude detector 25, the amplitude detector 25 detects amplitude of the input color signal and a coefficient controller 26 compares it with a killer level. If the input color signal fails to meet the killer level then the coefficient controller 26 controls a coefficient generated by the coefficient generator 22 to perform a killer operation. The ACC operation and circuitry is thereby ACK controlled until an input color signal meets or exceeds the killer level. When the selector 27 enables the multiplier circuit 11 according to an operating signal input, the input color signal is ACC controlled by the multiplier circuit 11, and amplitude detector 21, a coefficient generator 22, a coefficient memory 23 and a delay circuit 24.
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"EDTV With Scan-Line Video Processor", Masafumi Yugami et al., IEEE, vol. 38, No. 3, Aug 1992.
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"Y/C Separation System by General Purpose Video Processor," Yugami et al.
Ohara Kazuhiro
Yugami Masafumi
Donaldson Richard L.
Laws Gerald E.
McClure C. Alan
Miller John W.
Peng John K.
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