Circuit for providing accurately spaced video and sound carriers
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United States of America Patent
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-
Oct 8, 1985
Grant Date -
N/A
app pub date -
Nov 4, 1982
filing date -
Nov 4, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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