Oscillator for use with video signal time scaling apparatus
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United States of America Patent
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Jul 30, 1991
Grant Date -
N/A
app pub date -
Oct 19, 1990
filing date -
Oct 19, 1990
priority date (Note) -
Expired
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Abstract
Video signal time scaling apparatus includes a gated oscillator enabled and disabled in synchronism with a line scanning rate and capable of generating an oscillatory signal which is other than a multiple of a line scanning rate. The phase of an oscillator output signal is compared to the phase of a reference signal a predetermined time after the oscillator is enabled. Phase coincidence indicates a correct oscillation frequency. Otherwise, the oscillator frequency is incremented or decremented until phase coincidence is achieved. The oscillator signal acts a READ clock for permitting a video signal to be read out of a line memory at a rate different than that at which the video signal was written into memory, thereby producing a time scaled output video signal.
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