Color signal demodulation circuit and method therefor

Details Color signal demodulation circuit and method therefor Color signal demodulation circuit and method therefor

1994-02-28

1995-08-08

Groody, James J.

Television

Image signal processing circuitry specific to television

Chrominance signal demodulator

348506, H04N 966

Patent

active

054403499

ABSTRACT:
A color signal demodulation circuit demodulates a color signal in correspondence with different chrominance subcarrier frequencies. The input color signal is delayed by .pi./2 using a so-called Hilbert transformer and the carrier signal for use in the demodulation is generated from a carrier generator. The input color signal and the carrier signal are selectively multiplied and added so as to demodulate a color difference signal of the desired baseband, to thereby correspond to the chrominance subcarriers having different frequencies while simplifying the hardware. A method for demodulating the chrominance signal, which method is particularly adapted to the demodulation circuit is also detailed.

REFERENCES:
patent: 4642675 (1987-02-01), Gassmann
patent: 4692889 (1987-09-01), McNeely
patent: 5093723 (1992-03-01), Yang

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