Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1980-03-31
1981-11-03
Murray, Richard
Facsimile and static presentation processing
Static presentation processing
Attribute control
H04N 949
Patent
active
042988845
ABSTRACT:
A chroma amplifier and color killer are described for use in a color television receiver. In a preferred embodiment, the chroma amplifier comprises a first pair of emitter-coupled transistors receiving a current source which has a D.C. operating component and an A.C. chroma signal component. A second pair of emitter-coupled transistors receives another current source which has only a D.C. operating component substantially equal to that received by the first pair of transistors. A variable ACC voltage and a substantially fixed bias voltage are applied to selected base terminals of the transistors such that one of the first pairs of transistors develops a gain controlled A.C. chroma signal output and one of the second pair of transistors develops an ACC-varied D.C. output signal free of chroma component. The latter signal drives a low power color killer for quenching color reproduction when the color component of the broadcast signal is missing or is of very low amplitude.
REFERENCES:
patent: 3730978 (1973-05-01), Wakai et al.
patent: 3772463 (1973-11-01), Wakai et al.
Coult John H.
Murray Richard
Zenith Radio Corporation
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