Patent ID: 6493040
Filing Date: 2002-12-10
Classification: H04N

Abstract:
A video display deflection apparatus, comprising:means for producing a deflection field that varies a position of an electron beam on a screen of a cathode ray tube to form horizontal lines of a raster; a source of a video signal for displaying picture information contained in said video signal in said horizontal lines, said video signal providing, selective, first type of visual content and a second type of visual content, such that, when each of said types of visual content is provided, horizontal scanning occurs at a first horizontal deflection frequency; a source of a first control signal having a first value, when said video signal provides said first type of visual content and a second value, when said video signal provides said second type of visual content; and a waveform generator responsive to said video signal for generating a correction signal coupled to said deflection field producing means for varying said deflection field in accordance with said video signal to produce scan velocity modulated deflection of said electron beam, said waveform generator including a switch responsive top said first control signal for selecting a first waveform of said correction signal, when said first control signal is at said first value and a different, second waveform, when said first control signal is at said second value.