Television horizontal oscillator frequency control arrangement f

Details Television horizontal oscillator frequency control arrangement f Television horizontal oscillator frequency control arrangement f

1977-12-19

1979-03-13

Murray, Richard

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

H04N 504

Patent

active

041445457

ABSTRACT:
A television horizontal oscillator for use with a video source having a step change in the phase of the horizontal synchronizing pulses occurring at the vertical rate uses a phase-lock loop including a low-pass filter having a controllable filter characteristic. The control input of the filter is coupled to a source of vertical deflection rate signals and the filter attenuation is varied at the vertical rate. A delay arrangement including a ramp generator and a comparator delays the variation of the filter characteristic relative to the vertical synchronizing signal.

REFERENCES:
patent: 3740489 (1973-06-01), Willis
patent: 3846584 (1974-11-01), Itoh et al.

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