Digital chrominance signal demodulation apparatus

Details Digital chrominance signal demodulation apparatus Digital chrominance signal demodulation apparatus

1993-06-09

1995-03-07

Groody, James J.

Television

Synchronization

Phase locking regenerated subcarrier to color burst

348505, 348507, 348641, 348639, 358310, H04N 989, H04N 984, H04N 987, H04N 983

Patent

active

053962940

ABSTRACT:
Different from typical signal processing which employs a feedback control, by adopting a demodulating circuit employing AFC, which is not affected by a comb filter, the response characteristic against jitter is improved and a down converted chrominance signal can be demodulated with a good accuracy. Therefore, the noise rejection effect by a comb filter is improved, the detecting accuracy of the residual phase error is also improved, and the S/N ratio of the phase is improved by combining feedforward APC compensation with a velocity error, and this results in a much improved picture quality.

REFERENCES:
patent: 4686560 (1987-08-01), Balaban et al.
patent: 4689664 (1987-08-01), Moring et al.
patent: 4724476 (1988-02-01), Nakagawa et al.
patent: 4974082 (1990-11-01), Heitman
patent: 5062004 (1991-10-01), Winterer et al.
T. Matsumoto et al., "All Digital Video Signal Process System for S-VHS VCR", IEEE Transactions on Consumer Electronics, vol. 36, No. 3, pp. 560-566 (Aug. 1990).

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