Patent ID: 6307334
Filing Date: 2001-10-23
Classification: G09G,H04N

Abstract:
Device for a television receiver comprising a horizontal deflection circuit associated with a flyback transformer, said horizontal deflection circuit being controlled by a deflection control circuit and comprising a switch, the deflection control circuit comprising:means for generating a phase difference signal which is a function of the phase difference of horizontal synchronization pulses and flyback pulses;means for generating a control signal of the switch as a continuous function of the phase difference of said phase difference signal,said means for generating a control signal comprising a sawtooth signal generator and a comparator between a sawtooth signal generated by said sawtooth signal generator and the phase difference signal, the sawteeth of said sawtooth signal being triggered at given time intervals after the horizontal synchronization pulses, said control signal having a jitter amplitude;wherein said control circuit further comprisesmeans for generating at least one discrete phase jump of said control signal when said phase difference signal lies outside of a range of preset values;and means for generating a triggering signal comprising pulses giving triggering times of the sawtooth signal, said means for generating a triggering signal comprising a pixel counter reset by the horizontal synchronization pulses, an up/down counter incremented or decremented of a given value corresponding to the discrete phase jump when the phase difference signal lies outside of the range of preset values, ane means for combining the outputs of the pixel counter and of the up/down counter into the triggering signal.