Digital phase error detector for locking to color subcarrier of

Details Digital phase error detector for locking to color subcarrier of Digital phase error detector for locking to color subcarrier of

1995-12-12

1997-12-30

Peng, John K.

Television

Synchronization

Automatic phase or frequency control

348536, 331 20, H04N 945

Patent

active

057036560

ABSTRACT:
A digital phase error detector for locking to a color subcarrier signal in an analog video signal. The digital phase error detector includes a digitizer responsive to a sample clock which generates a first digital data stream from the analog video signal. Filtering circuitry filters the first digital data stream to generate a second data stream by substantially eliminating DC offset of the color subcarrier signal digitized by the digitizer. A mixer mixes the second digital data stream to generate a third digital data stream representing sum and difference frequencies of a product of the color subcarrier signal and a reference clock. An accumulator accumulates this product which represents a phase error between the color subcarrier signal and the reference clock. A voltage controlled oscillator is responsive to this phase error for generating the sample clock.

REFERENCES:
patent: 3534169 (1970-10-01), Bockwoldt
patent: 4491862 (1985-01-01), Flamm
patent: 4679005 (1987-07-01), Tatami
patent: 4694326 (1987-09-01), Demmer
patent: 4713690 (1987-12-01), Watanabe et al.
patent: 4733197 (1988-03-01), Chow
patent: 4774577 (1988-09-01), Takimoto
patent: 4780759 (1988-10-01), Matsushima et al.
patent: 4884040 (1989-11-01), Fling
patent: 5153725 (1992-10-01), Masaike
patent: 5159292 (1992-10-01), Canfield et al.
patent: 5235422 (1993-08-01), Ido et al.
patent: 5355172 (1994-10-01), Adams et al.
patent: 5416527 (1995-05-01), Casey
patent: 5539357 (1996-07-01), Rumreich

Affiliated with

Also associated with

Rating

Digital phase error detector for locking to color subcarrier of does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Digital phase error detector for locking to color subcarrier of , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Digital phase error detector for locking to color subcarrier of will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-207446