US PATENT SUBCLASS 327 / 45
.~.~.~ Including sampling or reference frequency


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}
45.~.~.~ Including sampling or reference frequency


DEFINITION

Classification: 327/45

Including sampling or reference frequency:

(under subclass 44) Subject matter wherein (a) the predetermined signal frequency selected is derived by representation of another known signal frequency at intermittent time intervals or (b) wherein a signal of fixed frequency is utilized in the frequency selection.

SEE OR SEARCH THIS CLASS, SUBCLASS:

7+, for phase angle sensing circuits using a reference

signal.

42, for a fixed frequency reference signal used in plural signal frequency comparison.