US PATENT SUBCLASS 331 / 23
.~.~ Sensing modulation (e.g., frequency modulation controlled oscillator

Current as of: June, 1999
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331 /   HD   OSCILLATORS

1 R  DF  AUTOMATIC FREQUENCY STABILIZATION USING A PHASE OR FREQUENCY SENSING MEANS {16}
18  DF  .~ With reference oscillator or source {5}
23.~.~ Sensing modulation (e.g., frequency modulation controlled oscillator {1}
24  DF  .~.~.~> With motor comparator

DEFINITION

Classification: 331/23

(under subclass 18) Subject matter wherein means are provided to frequency modulate the generated oscillations of the controlled oscillator by a low frequency reference source, signals representative of the modulated signal being compared with signals from the low frequency reference source in a signal comparator, the error signal from the output of the comparator being utilized to restore the generated frequency of the oscillator to the desired relationship with the reference frequency.

SEE OR SEARCH THIS CLASS, SUBCLASS:

4, for A.F.S. oscillators wherein the frequency of the oscillator is swept over a range of frequencies so as to bring the generated frequency within the "capture" range of the discriminator.