PAL alternate line color phase detector

Details PAL alternate line color phase detector PAL alternate line color phase detector

1976-03-29

1977-05-17

Richardson, Robert L.

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 947

Patent

active

040245721

ABSTRACT:
The line-by-line R-Y component phase is detected by digital means directly from the composite video source, for example, the recorded composite video signal reproduced from a video tape recorder, and a continuous signal waveform at a two-line period is produced which indicates the instantaneous polarity of the R-Y component of each line of a PAL format video signal. The invention further provides for a positive elimination of the effect of spurious signals, such as dropouts, as well as compensating for the frame rate offset of the subcarrier employed in certain signal formats, such as PAL-B.

REFERENCES:
patent: R28823 (1976-05-01), Coleman, Jr.

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