Line synchronizing circuit for a picture display devices and pic

Details Line synchronizing circuit for a picture display devices and pic Line synchronizing circuit for a picture display devices and pic

1983-04-07

1985-08-13

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358148, 331 1R, 331 11, H03L 700, H04N 504

Patent

active

045353581

ABSTRACT:
A line synchronizing circuit for a picture display device comprising a phase control loop for controlling a line oscillator. The circuit comprises a coincidence detector for establishing that a phase difference between the incoming line synchronizing signal and the oscillator signal is less than a predetermined value. When the output signal of the coincidence detector reaches a reference value indicating the presence of an incoming signal, the loop gain and the pull in rate, respectively, of the control loop are switched to a higher value than prior thereto. In addition, the circuit comprises a signal prolonging element which subsequently maintains the control loop in this state during a predetermined period of time. Thanks to this measure the oscillator can be pulled-in with absolute certainty.

REFERENCES:
patent: 3952261 (1976-04-01), Hara et al.
patent: 4214260 (1980-07-01), van Straaten

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