Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1974-03-19
1976-06-29
Griffin, Robert L.
Facsimile and static presentation processing
Static presentation processing
Attribute control
H04N 9535
Patent
active
039673138
ABSTRACT:
A chrominance signal gain control circuit comprising a band pass amplifier of a gain control type for amplifying a signal including a burst signal and a chrominance signal while the gain thereof is controllable as a function of a control voltage input, a burst amplifier responsive to the output from the band pass amplifier and a burst extracting pulse, such as a flyback pulse, for extracting and amplifying the burst signal, and an automatic color control detecting circuit responsive to the output from the burst amplifier for providing a peak detected output of the burst signal to the band pass amplifier as a control voltage input, whereby an automatic chrominance signal control is achieved, said circuit further comprising means for providing to the band pass amplifier as another control voltage input a pulse signal having a pulse width and a phase time covering the burst signal, the magnitude of which pulse signal is controllable manually or automatically. Manual adjustment of the magnitude of the pulse signal enables a color saturation control, while automatic adjustment thereof as a function of a color killer voltage enables a color killer operation and automatic adjustment thereof as a function of a peak detected output of the chrominance signal from the band pass amplifier enables a peak color control.
REFERENCES:
patent: 2921122 (1960-01-01), Macovski
patent: 3604844 (1971-09-01), Ross
patent: 3708613 (1973-01-01), Nakabe et al.
patent: 3717728 (1973-02-01), Smeulers
patent: 3764734 (1973-10-01), Srivastava et al.
Godfrey R. John
Griffin Robert L.
Sanyo Electric Co,. Ltd.
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