US PATENT SUBCLASS 327 / 3
.~.~ Comparison between plural inputs (e.g., phase angle indication, lead-lag discriminator, etc.)

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}
2  DF  .~ By phase {1}
3.~.~ Comparison between plural inputs (e.g., phase angle indication, lead-lag discriminator, etc.) {5}
4  DF  .~.~.~> With transducer
5  DF  .~.~.~> With input derived from feedback
6  DF  .~.~.~> With electron space discharge
7  DF  .~.~.~> With reference signal {4}
12  DF  .~.~.~> With logic or bistable circuit

DEFINITION

Classification: 327/3

Comparison between plural inputs (e.g., phase angle indication, lead-lag discriminator, etc.):

(under subclass 2) Subject matter wherein the output signal is indicative of the phase positioning or phase differences among two or more input signals.

(1) Note. Detectors producing an output which is a result of demodulation of a carrier having previously been modulated by an intelligence waveform which varies arbitrarily will not be classified here. See SEARCH CLASS below.

SEE OR SEARCH THIS CLASS, SUBCLASS:

40+, for comparison between plural input frequencies.

SEE OR SEARCH CLASS

329, Demodulators,

345+, for circuits producing an output which is a result of demodulation of a carrier having previously been phase modulated by an intelligence waveform.

363, Electric Power Conversion Systems, appropriate subclasses for phase conversion circuits with phase angle sensing. 455, Telecommunications,

130+, for mixers or converters utilized in a superheterodyne receiver (commonly referred to as a first detector).