Clock signal generator providing non-symmetrical alternating pha

Details Clock signal generator providing non-symmetrical alternating pha Clock signal generator providing non-symmetrical alternating pha

1977-01-28

1978-10-24

Martin, John C.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 13, H04N 578, H04N 902

Patent

active

041224787

ABSTRACT:
Apparatus is disclosed for providing a square wave output signal for use in alternating the phase of a sampling clock signal on successive video lines of a video signal having a horizontal blanking interval at the beginning of each video line and a burst of cycles of chrominance subcarrier in each of said horizontal blanking intervals. The square wave output signal changes between first and second levels during alternate video lines, but the signal is always maintained at one of said levels during the occurrence of the bursts of cycles. The square wave signal controls the sampling clock signal generator so that the clock signal is of a first phase while the square wave signal is at the first level and of an opposite phase while the square wave signal is at the second level.

REFERENCES:
patent: 3946432 (1976-03-01), Goldberg et al.
patent: 4024572 (1977-05-01), Derenbecher
patent: 4065784 (1977-12-01), Rossi

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