Methods and devices for stabilizing the rest frequency of freque

Details Methods and devices for stabilizing the rest frequency of freque Methods and devices for stabilizing the rest frequency of freque

1975-01-17

1976-10-05

Martin, John C.

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 940

Patent

active

039848639

ABSTRACT:
The rest frequency of an oscillator supplying a sub-carrier modulated in frequency by the chrominance signal from a SECAM television transmitter, is servocoupled to a reference frequency during the frame return periods and a phase shift of the oscillator is effected during the line return periods, shorter than the frame return periods. The servocoupling device comprises a reference frequency generator, and a servocoupling loop comprising a switch member and storage means for storing a parameter which controls the rest frequency of the ocillator, and control means for actuating the switch into closed condition, so closing the loop during the frame sweep return periods. The oscillator comprises means for phase setting during line return periods, shorter than the frame return periods.

REFERENCES:
patent: 2296919 (1942-09-01), Goldstine
patent: 2501368 (1950-03-01), White
patent: 2559719 (1951-07-01), Hershberger
patent: 2968769 (1961-01-01), Johnson et al.

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