Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1985-02-11
1987-01-06
Masinick, Michael A.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358 19, H04N 713
Patent
active
046350977
ABSTRACT:
A method and system for converting an analog video input signal into a digital video signal corrects for jitter and other spurious input frequency errors without the need for a time base correction circuit. The phase of the video input signal relative to a reference pulse signal is measured at two points of time during video signal processing and the two measured phase values are compared to derive a phase error signal indicative of the spurious phase error for a corresponding horizontal scan line. The phase error signal is then used to adjust the phase of sampling clock pulses used to sample analog video input signal values of the corresponding scan line for conversion to digital values. Each clock pulse is phase-shifted only slightly, as the derived spurious phase error is distributed evenly among all of the clock pulses for the corresponding scan line. Preferably, the phase error is distributed linearly across the corresponding scan line and mirror-symmetrically about the center of the scan line.
REFERENCES:
patent: 4015288 (1977-03-01), Ebihara
patent: 4291332 (1981-09-01), Kato
patent: 4562456 (1985-12-01), Bolger
Eslinger Lewis H.
Masinick Michael A.
Sinderbrand Alvin
Sony Corporation
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