Patent ID: 6208093
Filing Date: 2001-03-27
Classification: H04N

Abstract:
A video display deflection apparatus operating at multi-scan horizontal frequencies, comprising:a source of an input signal at a frequency related to a selected horizontal deflection frequency;a first switch, responsive to said input signal and coupled to a horizontal deflection winding and to a retrace capacitance, for generating a horizontal deflection current in said horizontal deflection winding at the selected horizontal deflection frequency, said horizontal deflection winding being coupled to an S-shaping capacitance for generating an S-shaping voltage that provides horizontal linearity distortion correction;a first clamp circuit selectable in accordance with the selected horizontal deflection frequency for clamping said S-shaping voltage, during a portion of a horizontal period; anda second switch responsive to said input signal and coupled to said first clamp circuit for selecting said first clamp circuit, when the selected horizontal deflection frequency is within a first range, and for de-selecting said first clamp circuit, when the selected horizontal deflection frequency is within a second range.