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

041445449

ABSTRACT:
A television receiver used in conjunction with a video tape recorder having a step change in phase of the horizontal synchronizing pulse occurring prior to the vertical blanking signal produces a distorted video display. The video distortion results from too slow slewing of the horizontal oscillator phase-locked loop to the new phase. In order to reduce the video distortion, the phase-locked loop filter is switched to a high gain condition at a time before the end of the vertical scanning interval.

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

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