Playback color processing circuit

Details Playback color processing circuit Playback color processing circuit

1989-07-05

1991-07-16

Britton, Howard W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 40, 358 21R, 358167, 358329, H04N 964, H04N 5213

Patent

active

050329022

ABSTRACT:
A playback color processing circuit for a video tape recorder includes an automatic phase control loop and has two comb filters. A first comb filter. A contains a single 1H delay line for canceling adjacent-track crosstalk in the automatic phase control loop. Further, a second comb filter contains two 1H delay lines for canceling adjacent-track crosstalk in the chrominance output signal. Due to the short H/2 group delay time of the first comb filter, the chrominance output of this circuit possesses excellent phase stability and is free of hue irregularities. Due to the superior spurious output characteristics of the second comb filter, the chrominance output has good vertical resolution and can create a color picture free of vertical color smear.

REFERENCES:
patent: Re31326 (1983-07-01), Amery et al.
patent: 4754340 (1988-06-01), Nakagawa et al.
patent: 4849808 (1989-07-01), Rossi
patent: 4930005 (1990-05-01), Yamada et al.
"Technik der magnetischen Videosignalaufzeichnung" to Von Prof. Dr.-Ing. B. Morgenstern, Universitat der Bundeswehr Hamburg, B. G. Teubner Stuttgart 1985.
Japanese patent application Kokai Publication No. 56-9073 to Hirota, 1981.
Japanese patent application Kokai Publication 60-51390 to Matsuo et al., 1985.

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