Convergence control system for multiple vertical formats

Details Convergence control system for multiple vertical formats Convergence control system for multiple vertical formats

1991-12-13

1992-11-03

Peng, John K.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 11, 358 12, 358141, 31536811, H04N 701, H04N 704, H04N 1120, H04N 1106

Patent

active

051610027

ABSTRACT:
Convergence correction waveforms are generated for multiple vertical formats. One of a number of vertical formats is selected for displaying a video signal. The vertical formats differ by respective vertical scanning rates, respective vertical scanning heights, or both. A set of convergence correction values corresponding to a plurality of raster locations is stored for each of the different vertical scanning heights. An interpolation control value is stored for each of the vertical scanning frequencies. An interpolator is responsive to different ones of the control values for generating a different set of intermediate convergence correction values for each of the vertical scanning frequencies, from each of the sets of stored convergence correction values. The interpolator generates the intermediate convergence correction values between horizontally and vertically spaced ones of the raster locations.

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