Television subcarrier phase correction for color field sequencin

Details Television subcarrier phase correction for color field sequencin Television subcarrier phase correction for color field sequencin

1977-01-28

1979-03-20

Martin, John C.

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 579, H04N 902

Patent

active

041457048

ABSTRACT:
Apparatus is disclosed for producing a full four field NTSC color code sequence of color video information in a manner whereby a continuous nonjittering color video image can be displayed by repeatedly reproducing a recorded two field sequence of color video information. The apparatus is useful in a recording machine which samples the information signal at an odd multiple of the subcarrier frequency and converts the samples to a number of digital data streams and also removes and reinserts horizontal synchronization digital words in the digital component data streams, wherein the horizontal synchronization words are synchronized with the subcarrier. A phase continuous clock signal is used to time the processing of the repetitively reproduced two field sequence of video information. Since the phase of the subcarrier alternates on the second reproducing of a two field sequence, for example, the synchronization word would be misplaced on the second reproduction and would cause a jittering of the video display in the absence of the apparatus of the present invention.

REFERENCES:
patent: 3564123 (1971-02-01), Pezirtzoglov
patent: 3921209 (1975-11-01), Yoshino et al.
patent: 3946432 (1976-03-01), Goldberg
Stratton, "Reviewing Slow-Motion Disc Principles, Broadcast Engineering," Feb. 1969, pp. 14-18.
Davidoff, "Digital Viedeo Recording for Television Broadcasting," Journal of SMPTE, vol. 84, July 1975, pp. 552-555.

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