US PATENT SUBCLASS 455 / 205
.~ Frequency or phase modulation

Current as of: June, 1999
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130  DF  RECEIVER OR ANALOG MODULATED SIGNAL FREQUENCY CONVERTER {24}
205.~ Frequency or phase modulation {7}
206  DF  .~.~> Responsive to one of overlapping signals
207  DF  .~.~> With plural conversion
208  DF  .~.~> With synchronized or controlled local oscillator {1}
210  DF  .~.~> With carrier amplitude modulation elimination (e.g., specified limiter) {1}
212  DF  .~.~> With squelch or other audio output silencing {1}
214  DF  .~.~> With particular discriminator or detector {1}
216  DF  .~.~> With particular frequency division or multiplication

DEFINITION

Classification: 455/205

Frequency or phase modulation:

(under subclass 130) Subject matter comprising a receiver system designed to convert a frequency-modulated or phase-modulated carrier wave input into perceptible output signals representative of the useful information contained in the modulation signal.

(1) Note. The basic elements of receivers included in this and the indented subclasses includes an input means (e.g., an antenna or converter means, intermediate frequency amplifier means, limiter means, frequency or phase discriminator and/or demodulator means, low (e.g., audio) frequency amplifier means and utilization means such as a loud speaker.

(2) Note. The subject matter found in this and the indented subclasses ordinarily will not include a frequency or phase modulation receiver by name only (i.e., recited as in a frequency modulation receiver, etc.) followed by specific details of an otherwise classifiable system which is not limited by its function to use in a frequency or phase modulation receiver. However, where the disclosure relates to such a frequency or phase modulation receiver and the receiver is included by name only followed by specifically claimed subject matter which is peculiar to such type a receiver, classification will be herein.

SEE OR SEARCH THIS CLASS, SUBCLASS:

23, for frequency modulation-type radio repeater systems.

42+, for spaced transmitter and receiver systems of the frequency or phase modulation type.

110+, for frequency or phase modulated transmitters, per se. SEE OR SEARCH CLASS

178, Telegraphy,

66.1+, for frequency shift telegraph receivers.

324, Electricity: Measuring and Testing,

76.39+, for frequency comparison or testing devices; and subclasses 76.77+ for phase comparison means.

329, Demodulators,

315+, for a frequency demodulator and subclasses 345+ for a phase demodulator.

332, Modulators,

117+, and 144+ for frequency or phase modulator, per se.

340, Communications: Electrical,

870.18+, for frequency or phase modulated telemetry systems; and subclasses 825.70 and 825.71+ for phase and frequency responsive selective systems. 343, Communications: Radio Wave Antennas,

17.5, for frequency or phase modulation radar systems; subclasses 100+ for directional receivers utilizing a frequency modulated input.

358, Facsimile,

400+, for facsimile systems which may utilize frequency modulation.

370, Multiplex Communications,

215, for multiplex phase modulation, and subclass 483 for multiplex frequency or angle modulation.

375, Pulse or Digital Communications,

271+, 302+, and 322+, for frequency or phase modulated carrier wave pulse or digital communications.