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 1104709

Abstract of the Disclosure 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. -1-

317436

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