Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1980-10-06
1982-04-06
Murray, Richard
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
H04N 544
Patent
active
043239242
ABSTRACT:
A phasing circuit is described for automatically controlling the phase of an oscillator input to a synchronous detector which demodulates a video signal in a television receiver. A conventional phase locked loop develops an oscillator signal whose phase tracks with variations in the phase of a video intermediate frequency (I.F.) signal applied to the loop. The automatic phasing circuit includes a phase adjustment network for coupling the video I.F. signal to the phase locked loop and for varying the phase of the latter signal input to the loop in response to a phase correction signal. The phase correction signal is preferably developed by a multiplier which senses the video I.F. signal and the input to the phase locked loop and controls the phase adjustment network such that the latter network varies the phase of the video I.F. input to the phase locked loop until the phase of the oscillator signal has a selected phase relationship to the video I.F. signal input to the synchronous detector.
REFERENCES:
patent: 3057954 (1962-10-01), Harling et al.
patent: 3626090 (1971-12-01), Akiyama et al.
patent: 3750029 (1973-07-01), Baars
patent: 4157569 (1979-06-01), Apeldoorn et al.
Murray Richard
Zenith Radio Corporation
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