US PATENT SUBCLASS 327 / 42
.~.~.~ Fixed frequency reference signal

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}
40  DF  .~.~ Comparison between plural inputs {3}
42.~.~.~ Fixed frequency reference signal

DEFINITION

Classification: 327/42

Fixed frequency reference signal:

(under subclass 40) Subject matter wherein a signal of constant frequency acts as a standard for comparison to a variable input signal.

SEE OR SEARCH THIS CLASS, SUBCLASS:

7+, for a fixed phase signal compared to a variable input.