Vertical deflection waveform generating apparatus
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorYasuo Murakami
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Abstract
A vertical deflection waveform generating apparatus is provided to have a memory in which a function of a vertical deflection waveform is previously stored. The function is a function with an order of horizontal scanning lines in which linearity of a raster is corrected as a parameter. The vertical deflection waveform generating apparatus generates a vertical deflection waveform by a digital signal processing circuit substituting a scanning order of the next scanning line in the parameter of the function, and sequentially outputting vertical deflection voltage at each time of detection of a horizontal synchronizing signal. Further, in order to reduce raster moire, timing for generating the vertical deflection waveform is offset for each frame.
Claims13
A vertical deflection waveform generating apparatus which generates a vertical deflection waveform for performing a raster scan of a cathode-ray tube, said vertical deflection waveform generating apparatus comprising:
- storing means in which waveform information of said vertical deflection waveform is represented and stored as a function having a parameter representing a scanning order of each respective horizontal scanning line in said raster scan, said function being a function in which vertical linearity of said raster scan is corrected;
- and
- vertical deflection waveform generating means for generating said vertical deflection waveform by substituting each respective scanning order of respective horizontal scanning lines in said parameter of said function, and for calculating vertical deflection waveform voltage, for each horizontal scanning line.
A vertical deflection waveform generating apparatus which generates a vertical deflection waveform raster performing a raster scan of a cathode-ray tube, said vertical deflection waveform generating apparatus comprising:
- first storing means in which vertical deflection voltage values corresponding to a subset of scanning lines of a plurality of horizontal scanning lines of said raster scan are stored;
- second storing means in which waveform information of a vertical deflection waveform corresponding to scanning lines interposed between said subset of scanning lines is represented and stored as functions having a parameter representing a scanning order of each respective one said plurality of horizontal scanning lines in said raster scan, said functions being functions in which vertical linearity of said raster scan are corrected;
- and
- vertical deflection waveform generating means for generating said vertical deflection waveform by substituting each respective scanning order of respective horizontal scanning lines in said parameter, and calculating vertical deflection waveform voltage, for each horizontal scanning line.
Dependencies are inferred from the claim text.