Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1982-11-15
1985-05-28
Murray, Richard
Facsimile and static presentation processing
Facsimile
Recording apparatus
358320, H04N 944
Patent
active
045204020
ABSTRACT:
A video disc player includes a phase locked loop (PLL) heterodyne converter for providing frequency translation and time base correction of the chrominance component of a composite video signal recovered when a disc is played. Residual time base errors due to the finite loop gain of the PLL are minimized by means of a phase modulator controlled by the PLL error signal. In one illustrative embodiment, the phase modulator is coupled so as to vary the phase of the translated chrominance output signal. In another embodiment, it is coupled to vary the phase of a demodulation carrier wave supplied to a chroma demodulator whereby, in either case, chroma streaking effects due to finite gain limitations of the PLL are minimized with no increase in loop gain thereby avoiding potential loop instabilities.
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Coalter R. G.
Emanuel P. M.
Murray Richard
Rasmussen P. J.
RCA Corporation
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