CATV converter having phase locked loop for sound carrier wave f

Details CATV converter having phase locked loop for sound carrier wave f CATV converter having phase locked loop for sound carrier wave f

1986-04-04

1987-09-08

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358196, 358198, 358 86, H04N 506, H04N 706, H04N 716

Patent

active

046928030

ABSTRACT:
A CATV converter has a phase locked loop (PLL) circuit for controlling the sound carrier wave frequency of the audio signal component of the resulting TV signal. The PLL circuit receives as inputs a branched part of the video signal component and a part of the audio signal output of an audio modulator for providing an output control signal to the audio modulator representing a selected frequency difference to be maintained between the video carrier wave frequency of the video signal and the sound carrier wave frequency of the audio signal output of the audio modulator.

REFERENCES:
patent: 3686431 (1972-08-01), Kitoaka
patent: 3924059 (1975-12-01), Horowitz
patent: 4145717 (1979-03-01), Guif
patent: 4163252 (1979-07-01), Mistry
patent: 4571622 (1986-05-01), Davidov
patent: 4591915 (1986-05-01), Davidov

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