Television horizontal oscillator frequency control...

Details Television horizontal oscillator frequency control... Television horizontal oscillator frequency control...

H - Electricity

04

N

350/88, 352/18.3

H04N 5/04 (2006.01) H04N 5/05 (2006.01)

Patent

CA 1104710

Abstract of the Disclosure 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. -1-

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