US PATENT SUBCLASS 329 / 300
FREQUENCY SHIFT KEYING OR MINIMUM SHIFT KEYING DEMODULATOR

Current as of: June, 1999
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329 /   HD   DEMODULATORS

300FREQUENCY SHIFT KEYING OR MINIMUM SHIFT KEYING DEMODULATOR {3}
301  DF  .~> Including discrete semiconductor device
302  DF  .~> Input signal combined with local oscillator or carrier frequency signal
303  DF  .~> Including logic element (e.g., logic gate or flip-flop

DEFINITION

Classification: 329/300

FREQUENCY SHIFT KEYING OR MINIMUM SHIFT KEYING DEMODULATOR:

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

(1) Note. Frequency shift keying modulation occurs when the frequency of a carrier is shifted among a plurality of discrete values in accordance with the modulating signal.

(2) Note. Minimum shift keying modulation is a type of frequency shift keying modulation in which there is phase continuity at the frequency transition points.

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

SEE OR SEARCH THIS CLASS, SUBCLASS:

304+, for a phase shift keying demodulator.

SEE OR SEARCH CLASS

375, Pulse or Digital Communications, 272+, for a frequency shift keying system (i.e., transmitter and receiver) and subclasses 322+ for a frequency shift keying demodulator combined with receiving structure.