US PATENT SUBCLASS 329 / 315
FREQUENCY MODULATION DEMODULATOR

Current as of: June, 1999
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329 /   HD   DEMODULATORS

315FREQUENCY MODULATION DEMODULATOR {7}
316  DF  .~> Plural demodulation {1}
318  DF  .~> Having specific distortion, noise or other interference prevention, reduction or compensation {3}
322  DF  .~> Including microwave or distributed parameter structure
323  DF  .~> Input signal combined with local oscillator or carrier frequency signal {2}
327  DF  .~> Input signal split into plural signals {5}
341  DF  .~> Input signal converted to and processed in pulse form (e.g., pulse counter or digital type demodulator) {2}
344  DF  .~> Including signal passed through single demodulating path including resonant circuit

DEFINITION

Classification: 329/315

FREQUENCY MODULATION DEMODULATOR:

(under the class definition) Subject matter where the demodulator extracts the modulating signal from a modulated signal which has undergone frequency modulation.

(1) Note. Frequency modulation occurs when the frequency of a carrier is varied over a continuum of values in accordance with the modulating signal.

(2) Note. This subclass includes frequency modulation demodulators, per se. See the SEARCH CLASS notes below for combinations with subject matter of this subclass.

SEE OR SEARCH THIS CLASS, SUBCLASS:

300+, for a frequency shift keying or minimum shift keying demodulator.

311+, for a pulse modulation demodulator.

345+, for a phase modulation demodulator.

347+, for an amplitude modulation demodulator. SEE OR SEARCH CLASS

455, Telecommunications,

42+, for frequency demodulation in a system with separated transmitter and receiver, and subclasses 205+ for a

combination of frequency demodulator with receiving structure.