Oscillator for use with video signal time scaling apparatus

Details Oscillator for use with video signal time scaling apparatus Oscillator for use with video signal time scaling apparatus

1990-10-19

1991-07-30

Mis, David

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 18, 331 20, 358133, H03L 708, H03L 7083, H04N 712

Patent

active

050362933

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.

REFERENCES:
patent: 4376268 (1983-03-01), Moriya et al.
patent: 4518994 (1985-05-01), Schnitzler
patent: 4623922 (1986-11-01), Wischermann
patent: 4914507 (1990-04-01), Smith et al.

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