Apparatus and method for tracking the subcarrier to horizontal s

Details Apparatus and method for tracking the subcarrier to horizontal s Apparatus and method for tracking the subcarrier to horizontal s

1987-04-10

1989-08-22

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 19, 358325, 358326, H04N 1702, H04N 945

Patent

active

048600890

ABSTRACT:
Tracking of a standard or non-standard input video signal, such as a NTSC or PAL composite video signal, is provided by supplying the phase difference between a horizontally-related subcarrier signal, and a variable horizontal sync signal, which is indicative of the SCH phase shift in the input video signal. The phase difference is used to generate a corresponding servo voltage, which then is used to steer the bias of a monostable and thus vary accordingly the trailing edge of a pulse generated thereby, to remove the phase difference. Thus the variable horizontal sync signal is made to coincide with the subcarrier signal, which forces the system to track the subcarrier-to-horizontal sync phase of the input video signal.

REFERENCES:
patent: 4052733 (1977-10-01), Derenbecher, Jr.
patent: 4313129 (1982-01-01), Fukui
patent: 4468709 (1984-08-01), Kenjyo
patent: 4562457 (1985-12-01), Salvia
patent: 4647984 (1987-03-01), Suzuki et al.
patent: 4675724 (1987-06-01), Wagner

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