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

1983-09-07

1986-03-04

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358148, 358159, 358 17, 331 18, 331 20, 328133, H03L 700, H04N 504

Patent

active

045743070

ABSTRACT:
A line synchronizing circuit for a picture display device comprising a control loop for controlling a line oscillator. An incoming line synchronizing signal and also a reference signal generated by the oscillator are applied to a phase discriminator circuit. The output signal of the phase discriminator circuit is smoothed to obtain the control voltage for the oscillator. Pull-in of the control loop is established by means of a coincidence detector. Prior to that, an edge of the reference signal is compared with the center instant of a line synchronizing pulse. When the control loop is in the pulled-in state, it is changed by the coincidence detector to compare the leading edge of a line synchronizing pulse to the center instant between the said edge of the reference signal and its first preceding edge.

REFERENCES:
patent: 4214260 (1980-07-01), van Straaten

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