US PATENT SUBCLASS 327 / 21
.~.~ With variable frequency source

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}
18  DF  .~ By presence or absence pulse detection {3}
21.~.~ With variable frequency source

DEFINITION

Classification: 327/21

With variable frequency source:

(under subclass 18) Subject matter wherein the absent or present pulse is detected from a varying frequency input signal.