US PATENT SUBCLASS 327 / 41
.~.~.~ With synchronous 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}
40  DF  .~.~ Comparison between plural inputs {3}
41.~.~.~ With synchronous detection

DEFINITION

Classification: 327/41

With synchronous detection:

(under subclass 40) Subject matter wherein the output signal provides an indication of the maintenance of precise matching between two or more input signal frequencies.

SEE OR SEARCH THIS CLASS, SUBCLASS:

141+, for synchronizing control.

SEE OR SEARCH CLASS

331, Oscillators,

1+, for controlling frequency synchronization in oscillator circuits (e.g., phase lock loop circuits, etc.).

348, Television,

638+, and 726+ for television receivers that may include synchronous detectors.