US PATENT SUBCLASS 327 / 46
.~.~.~ Including plural frequency detection

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  DF  .~.~ With predetermined frequency selection {2}
46.~.~.~ Including plural frequency detection

DEFINITION

Classification: 327/46

Including plural frequency detection:

(under subclass 44) Subject matter wherein more than one signal frequency is detected by a single circuit or system.