US PATENT SUBCLASS 329 / 358
.~ Input signal combined with local oscillator or carrier frequency signal (e.g., synchronous demodulator)

Current as of: June, 1999
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329 /   HD   DEMODULATORS

347  DF  AMPLITUDE MODULATION DEMODULATOR {12}
358.~ Input signal combined with local oscillator or carrier frequency signal (e.g., synchronous demodulator) {3}
359  DF  .~.~> Input signal applied directly to local oscillator
360  DF  .~.~> Including phase or frequency locked loop
361  DF  .~.~> Including sampling, gating, or switching {1}

DEFINITION

Classification: 329/358

Input signal combined with local oscillator or carrier frequency signal (e.g., synchronous demodulator):

(under subclass 347) Subject matter where the modulated signal input to the demodulator interacts therein with oscillations from a secondary source.

(1) Note. The secondary oscillations may be internally generated or externally supplied and may be at a frequency other than that of the modulated input signal's carrier.

(2) Note. A synchronous demodulator uses a local carrier frequency signal synchronized with the carrier of the modulated input signal to cancel out the modulated input signal's carrier.

SEE OR SEARCH THIS CLASS, SUBCLASS:

302, for similar structure in a frequency shift keying or minimum shift keying demodulator.

306+, for similar structure in a phase shift keying or quadrature amplitude demodulator.

323+, for similar structure in a frequency modulation demodulator. 346, for similar structure in a phase modulation demodulator.

SEE OR SEARCH CLASS

455, Telecommunications,

255+, for generic local oscillator frequency control in a receiver.