Chroma crawl elimination without any cumulative difference in fr

Details Chroma crawl elimination without any cumulative difference in fr Chroma crawl elimination without any cumulative difference in fr

1988-04-01

1989-05-23

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 16, H04N 944

Patent

active

048335231

ABSTRACT:
Chroma crawl, and a 15 Hz component introduced by the NTSC subcarrier pattern repeated every four fields, is obviated by adding to and substracting from the horizontal and vertical sync timing of alternate frames the period of one half cycle of the color subcarrier. Upon encoding television color signals with the color subcarrier for transmission in a compact video signal with the horizontal and vertical signals generated by this method, a chroma crawl free composite video signal results without producing any cumulative timing difference.

REFERENCES:
patent: 4660074 (1987-04-01), Schine
patent: 4661840 (1987-04-01), Phelps

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