Circuit for providing accurately spaced video and sound carriers

Details Circuit for providing accurately spaced video and sound carriers Circuit for providing accurately spaced video and sound carriers

1982-11-04

1985-10-08

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358143, 358197, H04N 706

Patent

active

045463875

ABSTRACT:
A circuit for producing two carrier frequencies (e.g. video and audio) spaced by an accurately controlled, predetermined frequency includes a common reference oscillator connected in two phase-locked loops. Each of the phase-locked loops includes a voltage-controlled oscillator adapted to produce an output signal at one of the carrier frequencies, and a phase detector for comparing a different predetermined fraction of the outputs of the voltage-controlled oscillators in each of the loops with a predetermined fraction of the output frequency of the reference oscillator.

REFERENCES:
patent: 2858369 (1958-10-01), Kahn
patent: 4354200 (1982-10-01), Haenen

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