Circuitry for comb filtering PAL and NTSC video signals

Details Circuitry for comb filtering PAL and NTSC video signals Circuitry for comb filtering PAL and NTSC video signals

1988-10-24

1990-10-02

Chin, Tommy P.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 40, 358329, H04N 978

Patent

active

049611089

ABSTRACT:
Comb filter apparatus for comb filtering NTSC or PAL video signals includes sampling circuitry to sample the video signal at 45 degrees relative to the I,Q or U,V axes. The sampled signal is coupled to delay circuitry arranged to concurrently provide video samples from three successive horizontal lines, designated top, middle and bottom. The video samples from the middle line are combined with samples alternately selected from the top and bottom lines to provide a comb filtered signal.

REFERENCES:
patent: 4480265 (1984-10-01), Spiero
patent: 4506286 (1985-03-01), Kashigi
patent: 4688080 (1987-08-01), Wagner
patent: 4706113 (1987-11-01), Ito et al.
patent: 4727415 (1988-02-01), Nakagawa et al.
patent: 4786963 (1988-11-01), McNeely
patent: 4803547 (1989-02-01), Stratton
Y. Nakajima et al., "Improvement of Picture Quality for NTSC and PAL Systems by Digital Signal Processing", IEEE Trans. Consumer Electronics, vol. CE-31, No. 4, Nov. 1988, pp. 642-654.

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