Combined phase shift filter network in a color video signal proc

Details Combined phase shift filter network in a color video signal proc Combined phase shift filter network in a color video signal proc

1979-03-14

1980-06-10

Murray, Richard

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 9535

Patent

active

042075904

ABSTRACT:
A combined phase shift and bandpass filter circuit in a color television receiver including color signal demodulators, and an automatic flesh tone correction network which provides a reference signal for the color demodulators, is disclosed. The circuit comprises an integral bandpass filter and phase shift network coupled between the output of the flesh tone correction network and the reference signal inputs of the demodulators. The circuit filters unwanted frequency components of the reference signal from the flesh correction network, and provides phase shifting of the reference signal as appropriate for proper operation of the demodulators. The circuit exhibits good phase stability, does not require alignment from receiver to receiver, and requires a minimum of connecting terminals to the flesh correction network and color demodulators.

REFERENCES:
patent: 3749825 (1973-07-01), Moore
patent: 4048652 (1977-09-01), Rzeszewski

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