US PATENT SUBCLASS 327 / 2
.~ By phase

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.~ By phase {1}
3  DF  .~.~> Comparison between plural inputs (e.g., phase angle indication, lead-lag discriminator, etc.) {5}

DEFINITION

Classification: 327/2

By phase:

(under subclass 1) Subject matter wherein the discriminated input signal parameter is that fractional part of a periodic waveform which has elapsed relative to a fixed origin.

(1) Note. If the time for one signal period is represented as 360 degrees along a time axis, the phase position is called the phase angle.

SEE OR SEARCH THIS CLASS, SUBCLASS:

39+, for frequency comparison circuits.

231+, for phase correction or control.

261+, for output waveform production delay.

SEE OR SEARCH CLASS

303, Fluid-Pressure and Analogous Brake System, 91+, for speed-controlled vehicle systems.

329, Demodulators,

345+, for phase angle demodulation in which a intelligence signal is extracted.

331, Oscillators,

1+, for systems for stabilizing the frequency of an oscillator utilizing phase or frequency comparison devices, and subclasses 37+ for systems wherein two or more frequencies are combined to produce a beat frequency.

332, Modulators,

144+, for systems wherein the phase of a carrier wave is modulated by an arbitrarily varying quantity.

455, Telecommunications,

214+, for frequency or phase modulation with particular discrimination or detection.