Method and apparatus for noise reduction of cyclic signal by sel

Details Method and apparatus for noise reduction of cyclic signal by sel Method and apparatus for noise reduction of cyclic signal by sel

1995-06-07

1997-02-11

Teska, Kevin J.

Excavating

371 691, 386 34, 386 44, G06F 9455, H04N 5217

Patent

active

056030134

ABSTRACT:
An EDTV application utilizing a Synchronous Vector Processor (SVP) includes the operation whereby noise is reduced in the operation to demodulate the chroma signal. Initially, the NTSC composite video is separated into the luminance (Y) and the chroma (C) signals by a Y/C separator algorithm (272). The chroma signal is then processed through a colorburst calculation algorithm (290). During the colorburst calculation, the phase of the colorburst signal is determined by processing the chroma signal through a phase detector (416) to provide the phase components S.sub.i and M.sub.i. Both signals are cyclic signals and are processed in accordance with a majority noise reduction algorithm. The majority noise reduction algorithm is operable to sample a given portion of one of the cycles in the cyclic signal and also sample corresponding portions in adjacent cycles both prior to the present portion and preceding the present portion. A decision as to a logic state of the present portion is made by comparing all of the logic states of the sampled portions and forcing a select portion to the logic state of the majority of the sampled portions. This is then input to a phase shift circuit (414) and then to a demodulator (412) to adjust the phase thereof and output demodulated chroma.

REFERENCES:
patent: 3622765 (1969-06-01), Anderson
patent: 4107736 (1978-08-01), Lowry et al.
patent: 4227175 (1980-10-01), Newman
patent: 4375101 (1983-02-01), Cerracchio
patent: 4388729 (1983-06-01), Spencer et al.
patent: 4464674 (1984-08-01), Schulz et al.
patent: 4670880 (1987-06-01), Jitsukawa et al.
patent: 5091938 (1992-02-01), Thompson et al.
patent: 5119197 (1992-06-01), Kuroda
patent: 5166976 (1992-11-01), Thompson et al.
patent: 5185794 (1993-02-01), Thompson et al.
patent: 5225907 (1993-07-01), Casavant et al.
patent: 5235417 (1993-08-01), Casavant et al.
patent: 5241548 (1993-08-01), Dillon et al.
patent: 5267312 (1993-11-01), Thompson et al.
patent: 5384599 (1995-01-01), Casavant et al.
patent: 5406627 (1995-04-01), Thompson et al.

Affiliated with

Also associated with

Rating

Method and apparatus for noise reduction of cyclic signal by sel does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and apparatus for noise reduction of cyclic signal by sel, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for noise reduction of cyclic signal by sel will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-350290