US PATENT SUBCLASS 327 / 113
.~ Frequency or repetition rate conversion or control

Current as of: June, 1999
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327 /   HD   MISCELLANEOUS ACTIVE ELECTRICAL NONLINEAR DEVICES, CIRCUITS, AND SYSTEMS

100  DF  SIGNAL CONVERTING, SHAPING, OR GENERATING {29}
113.~ Frequency or repetition rate conversion or control {3}
114  DF  .~.~> Of output rectangular waveform {2}
117  DF  .~.~> Frequency division {1}
119  DF  .~.~> Frequency multiplication (e.g., harmonic generation, etc.) {3}

DEFINITION

Classification: 327/113

Frequency or repetition rate conversion or control:

(under subclass 100) Subject matter wherein a frequency characteristic of an input signal is modified to produce an output wave of different frequency characteristic which has a definite relationship to that of the input wave or where a frequency characteristic is held essentially constant.

SEE OR SEARCH THIS CLASS, SUBCLASS:

39+, for frequency discrimination without subsequent control.

141+, for miscellaneous synchronization circuits.

231+, for circuits providing a phase shift less than the period of an input signal.

SEE OR SEARCH CLASS

84, Music,

600+, for apparatus for generating or modifying electric currents or potentials to produce varying electric currents or potentials in combination with or intended for use with structure for converting the varying electric currents or potentials into musical tones.

250, Radiant Energy,

250, for wave meters which may employ frequency changing.

307, Electrical Transmission or Interconnection Systems,

424+, for parametric amplifier frequency converters, per se.

324, Electricity: Measuring and Testing,

79+, for electric wave frequency measuring systems of the heterodyne type.

329, Demodulators,

323+, or 346 for frequency or phase demodulators with oscillators.

331, Oscillators,

37+, for beat frequency oscillator systems and subclass 76 for systems including an oscillator combined with a harmonic producing or selecting network in the output. To be classified in Class 331 the oscillator must be the signal source and must be capable of self sustained oscillation.

332, Modulators, 117+, or 144+ for systems wherein a first source is modified in frequency or phase by mixing with an arbitrarily varying control source.

340, Communications: Electrical, particularly

870.01+, for telemetering systems and especially subclasses 870.18+ providing for frequency or phase modulation systems.

343, Communications: Radio Wave Antennas, appropriate subclasses for systems involving object detection by reflected pulses which may utilize phase or frequency modulation.

363, Electric Power Conversion Systems,

157+, for frequency conversion systems wherein a single electrical source is coupled to a single electrical load in a power conversion system.

375, Pulse or Digital Communications, appropriate subclasses for pulse communication systems which utilize phase or frequency modulation.

377, Electrical Pulse Counters, Pulse Dividers, or Shift Registers: Circuits and Systems, for pulse counters or counting systems.

455, Telecommunications,

313+, for radio receivers including frequency changing means.