Oscillator circuit for generating reference signals

Details Oscillator circuit for generating reference signals Oscillator circuit for generating reference signals

H - Electricity

04

N

331/32, 350/68

H04N 9/46 (1980.01)

Patent

CA 1040298

Abstract of the Disclosure An oscillator circuit is disclosed for generating reference signals having a frequency corrected in accordance with time base errors in video type signals. The oscillator has a control signal input for generating a reference signal train having a frequency dependent upon a control signal present at the control signal input. A sync generator is coupled to the oscillator for generating a sync reference signal. A first phase comparator has a first input coupled to the sync reference signal and a second input adapted to be coupled to the sync portions of the video type signals. The phase difference between the sync reference signal and successive ones of the sync portions of the video type signals is compared. The control signal is generated to have a magnitude dependent upon the phase difference, wherein the reference signal train frequency varies in accordance with the magnitude of the control signal to minimize the phase difference.

261713

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