Circuit for producing a periodic sawtooth shaped signal

Details Circuit for producing a periodic sawtooth shaped signal Circuit for producing a periodic sawtooth shaped signal

1981-09-04

1984-07-24

Heyman, John S.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

328155, 358159, 375111, H03L 700, H03K 408, H04N 504

Patent

active

044619995

ABSTRACT:
A circuit for producing a periodic sawtooth signal comprising an oscillator which is directly synchronizable by synchronizing pulses and the natural frequency of which is approximately equal to the repetition frequency of the pulses in the synchronizing absence of synchronizing pulses. At a phase difference between the sawtooth signal and the synchronizing pulses which exceeds a predetermined value the supply of synchronizing pulses is inhibited and a frequency correction circuit is made operative, causing the natural frequency of the oscillator to change. When the said phase difference becomes smaller than the predetermined value the frequency correction is switched-off and the synchronizing pulses are applied to the circuit so that direct synchronization is effected.

REFERENCES:
patent: 3127570 (1964-03-01), Smeulers
patent: 3769602 (1973-10-01), Griswold
patent: 3778723 (1973-12-01), Schaefer
patent: 4215315 (1980-07-01), Lambert et al.

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