50 Hz parabolic signal filter
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United States of America Patent
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May 2, 1995
Grant Date -
N/A
app pub date -
Mar 8, 1994
filing date -
Mar 8, 1994
priority date (Note) -
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Abstract
A scanning waveform generator for operation at a first or a second scanning frequency comprises a source of a parabolic shaped signal having a frequency selectable between the first or second scanning frequency. A means for generating a switching signal indicative of a video signal operating at one of a first or a second scanning frequency. A means for generating a sawtooth shaped waveform is coupled to the switching signal for switching between the first or the second scanning frequency. A means for generating an S correction signal is coupled to the source and to the sawtooth generating means. A means for filtering the parabolic signal is controllably coupled to the switching signal generator, and is also coupled to the S correction signal generating means. The filtered parabolic signal has an substantially the same shape during the first or second scanning frequency.
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