Television – Image signal processing circuitry specific to television – Chrominance signal demodulator
Patent
1996-03-27
1997-08-05
Hsia, Sherrie
Television
Image signal processing circuitry specific to television
Chrominance signal demodulator
348638, H04N 966
Patent
active
056547684
ABSTRACT:
A PAL system demodulator capable of delivering high quality color signals even in the cases of poor vertical correlation comprising 1H delay line 1 delaying the chroma signal by one horizontal period, 1H delay-line 2 delaying a reference signal by one horizontal period wherein the output of the 1H delay line 1 is defined by reference signal, color demodulating circuit 3 canceling hue error by conducting an operation between the scanning lines covering from the input and the output of the 1H delay line 1, color-demodulating circuit 4 canceling the hue error by conducting an operation between the scanning lines covering from the input and the output of the 1H delay line 2, vertical correlation detecting circuit 5 detecting the vertical correlation between the chroma signal of the reference signal and the chroma signal of the adjoining line or the chroma signal of the adjoining line separated by one-line, and selector 6 selecting the output of the color demodulating circuit 3 or the output of color demodulating circuit 4.
REFERENCES:
patent: 4786963 (1988-11-01), McNeely et al.
patent: 5512960 (1996-04-01), Hatano
Hsia Sherrie
Matsushita Electric - Industrial Co., Ltd.
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