US PATENT SUBCLASS 327 / 44
.~.~ With predetermined frequency selection

Current as of: June, 1999
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327 /   HD   MISCELLANEOUS ACTIVE ELECTRICAL NONLINEAR DEVICES, CIRCUITS, AND SYSTEMS

1  DF  SPECIFIC SIGNAL DISCRIMINATING (E.G., COMPARING, SELECTING, ETC.) WITHOUT SUBSEQUENT CONTROL {11}
39  DF  .~ By frequency {3}
44.~.~ With predetermined frequency selection {2}
45  DF  .~.~.~> Including sampling or reference frequency
46  DF  .~.~.~> Including plural frequency detection

DEFINITION

Classification: 327/44

With predetermined frequency selection:

(under subclass 39) Subject matter wherein the output signal consists of a chosen input signal having a specific frequency characteristic.

SEE OR SEARCH THIS CLASS, SUBCLASS:

552+, for unwanted signal suppression by an active filter.

SEE OR SEARCH CLASS

329, Demodulators, appropriate subclasses for circuits which select signals from modulated wave signals.