US PATENT SUBCLASS 332 / 103
PHASE SHIFT KEYING MODULATOR OR QUADRATURE AMPLITUDE MODULATOR

Current as of: June, 1999
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332 /   HD   MODULATORS

103PHASE SHIFT KEYING MODULATOR OR QUADRATURE AMPLITUDE MODULATOR {2}
104  DF  .~> Including logic element (e.g., logic gate or flip-flop)
105  DF  .~> Including discrete semiconductor device

DEFINITION

Classification: 332/103

PHASE SHIFT KEYING MODULATOR OR QUADRATURE AMPLITUDE MODULATOR:

(under the class definition) Subject matter in which the phase of the carrier is shifted among a plurality of discrete angles in accordance with the modulating signal.

(1) Note. Also included here is the case where the phase and amplitude of the carrier are simultaneously shifted among a plurality of discrete angle/magnitude pairs (i.e., QAM).

(2) Note. This subclass includes phase shift keying modulators, or quadrature amplitude modulators, per se. See the SEARCH CLASS notes below for combinations with the subject matter of this subclass.

SEE OR SEARCH THIS CLASS, SUBCLASS:

100+, for a frequency shift keying modulator.

SEE OR SEARCH CLASS

375, Pulse or Digital Communications,

261, for a quadrature amplitude modulation system (i.e., transmitter and receiver), subclasses 279+ for a phase shift keying system, and subclass 308 for a phase shift keying modulator combined with transmitting structure.