US PATENT SUBCLASS 329 / 323
.~ Input signal combined with local oscillator or carrier frequency signal

Current as of: June, 1999
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329 /   HD   DEMODULATORS

315  DF  FREQUENCY MODULATION DEMODULATOR {7}
323.~ Input signal combined with local oscillator or carrier frequency signal {2}
324  DF  .~.~> Input signal applied directly to local oscillator
325  DF  .~.~> Including phase or frequency locked loop {1}

DEFINITION

Classification: 329/323

Input signal combined with local oscillator or carrier frequency signal:

(under subclass 315) 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.

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.

346, for similar structure in a phase modulation demodulator.

358+, for similar structure in an amplitude modulation demodulator. SEE OR SEARCH CLASS

455, Telecommunications,

208+, for synchronized or controlled local oscillator in a FM receiver and subclasses 255+ for generic local oscillator frequency control in a receiver.