Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1988-09-19
1989-08-22
Britton, Howard W.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358148, 358188, 375116, H04N 505
Patent
active
048600989
ABSTRACT:
A video discriminator for automatically providing a format select indicator generates from the number of vertical sync pulses in a vertical interval of an input video signal and from the current state of the format select indicator an error signal if the number of vertical sync pulses is incompatible with the format select indicator. The error signal and a vertical sync detect pulse together with a horizontal line count determine the format of the input video signal and cause the format select indicator to change to reflect the format of the input video signal.
REFERENCES:
patent: 4398220 (1983-08-01), Satoh
patent: 4489343 (1984-12-01), Hosoya
patent: 4763341 (1988-08-01), Murphy
patent: 4785350 (1988-11-01), Burdick
Britton Howard W.
Gray Francis I.
The Grass Valley Group Inc.
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