Line synchronizing circuit for a picture display device

Details Line synchronizing circuit for a picture display device Line synchronizing circuit for a picture display device

H - Electricity

04

N

350/86

H04N 5/04 (2006.01) H04N 5/12 (2006.01)

Patent

CA 1194217

ABSTRACT: A line synchronizing circuit for a picture dis- play device comprising a voltage-controlled oscillator for generating a signal whose frequency is higher than the line frequency, a frequency dividing circuit for dividing the frequency of the oscillator signal and a phase comparision stage for generating a control voltage in dependence on the phase deviation between the signals applied thereto, more specifically a received line syn- chronizing signal and a locally generated reference sig- nal. The said elements of the line phase control loop, are part, at least partly, of an integrated circuit in the form of a frequency synthesizing circuit. The refer- ence-frequency dividing circuit incorporated in the inte- grated circuit is programmed to operate with a constant divisor.

408810

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