Method and apparatus for frequency modulating a phase locked loo

Details Method and apparatus for frequency modulating a phase locked loo Method and apparatus for frequency modulating a phase locked loo

1991-03-05

1993-04-20

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

3581951, 358188, H03L 700

Patent

active

052047466

ABSTRACT:
A new and improved method and apparatus, for use in video systems such as VCRs, for frequency modulating a phase locked loop with video information by modulating a video carrier signal with a video signal without alerting the frequency of the sync pulses is disclosed wherein the video modulated carrier signal is sampled during the occurrence of the sync pulses and any difference between the actual sync pulse frequency and a standard sync pulse frequency is used to adjust the frequency of the carrier frequency oscillator to bring the sync pulse frequency to the standard value.

REFERENCES:
patent: 4442413 (1984-04-01), Hayashida et al.
patent: 4689685 (1987-08-01), Testin et al.
patent: 4698601 (1987-10-01), Aizawa

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