US PATENT SUBCLASS 455 / 208
.~.~ With synchronized or controlled local oscillator

Current as of: June, 1999
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455 /   HD   TELECOMMUNICATIONS

130  DF  RECEIVER OR ANALOG MODULATED SIGNAL FREQUENCY CONVERTER {24}
205  DF  .~ Frequency or phase modulation {7}
208.~.~ With synchronized or controlled local oscillator {1}
209  DF  .~.~.~> Plural local oscillators or mixers

DEFINITION

Classification: 455/208

With synchronized or controlled local oscillator:

(under subclass 205) Subject matter including means whereby the operating frequency of a local oscillator device is maintained in synchronism with a reference frequency, is maintained constant or is varied in accordance with a variation of the frequency of an input signal or means whereby some other operating condition of the local oscillator is controlled.

SEE OR SEARCH THIS CLASS, SUBCLASS:

196, for signal selection based on frequency (e.g., tuning) means combined with local oscillator tuning means.

255, for automatic frequency control or synchronization systems for receivers in general.

316, for frequency modifying or conversion means combined with plural local oscillator means and provided with frequency stabilization means for at least one local oscillator.

502+, for plural spaced transmitter and receiver systems with synchronization means.

SEE OR SEARCH CLASS

329, Demodulators, 323+, and 346 for combining locally generated oscillations with a frequency modulated or phase modulated signal respectively.

331, Oscillators,

1+, for automatic frequency stabilization of an oscillator or oscillators utilizing phase or frequency sensing means.