US PATENT SUBCLASS 327 / 39
.~ By 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.~ By frequency {3}
40  DF  .~.~> Comparison between plural inputs {3}
44  DF  .~.~> With predetermined frequency selection {2}
47  DF  .~.~> Frequency detection {2}

DEFINITION

Classification: 327/39

By frequency:

(under subclass 1) Subject matter wherein the discriminated signal parameter relates to the number of times a signal repeats its basic waveform within a unit of time.

SEE OR SEARCH THIS CLASS, SUBCLASS:

2+, for discriminating by phase.

47+, for circuits where the output is present only at a predetermined frequency of the input.

113+, for miscellaneous frequency or repetition rate control.

114+, for pulse generating which includes frequency or repetition rate control.

231+, for phase correction or control.

261+, for output waveform production delay. 552+, for unwanted signal suppression by an active filter.

SEE OR SEARCH CLASS

303, Fluid-Pressure and Analogous Brake System,

91+, for speed-controlled fluid-pressure brake systems.

324, Electricity: Measuring and Testing,

76.19+, for a frequency spectrum analyzer and subclasses 76.39+ for measuring and testing of the frequency of cyclic current or voltage.

329, Demodulators,

315+, for frequency demodulation in which an 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, 117+, for systems wherein the frequency of a carrier wave is modulated by an arbitrarily varying quantity.

455, Telecommunications,

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

702, Data Processing: Measuring, Calibrating, or Testing,

75+, for frequency measurement system.