US PATENT SUBCLASS 332 / 149
AMPLITUDE MODULATOR

Current as of: June, 1999
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332 /   HD   MODULATORS

149AMPLITUDE MODULATOR {14}
150  DF  .~> Including measuring or indicating
151  DF  .~> Plural modulation {2}
155  DF  .~> Percent modulation control or automatic amplitude control of carrier or modulating signal {3}
159  DF  .~> Including stabilization or alternatively distortion, noise or other interference prevention, reduction or compensation {3}
163  DF  .~> Including microwave or distributed parameter structure {2}
167  DF  .~> Suppressed carrier double sideband type {2}
170  DF  .~> Single or vestigial sideband type {1}
172  DF  .~> Modulating signal applied to a bridge circuit
173  DF  .~> Magnetic field varied by modulating signal
174  DF  .~> Resistive or dissipative device controlled by modulating signal (e.g., loss modulator)
175  DF  .~> Variable reactance controlled by modulating signal
176  DF  .~> Nonlinear device controlled by modulating signal {1}
178  DF  .~> Including discrete semiconductor device
179  DF  .~> Including electron discharge device {3}

DEFINITION

Classification: 332/149

AMPLITUDE MODULATOR:

(under the class definition) Subject matter in which the amplitude of the carrier is varied over a continuum of values in accordance with the modulating signal.

(1) Note. If a system includes an amplitude modulator, but the final output signal is a pulse modulated, frequency modulated or phase modulated wave, the modulator is classified in subclasses 106+, 117+ or 144+, respectively.

(2) Note. This subclass includes 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:

106+, for a pulse modulator.

117+, for a frequency modulator.

144+, for a phase modulator.

SEE OR SEARCH CLASS 455, Telecommunications,

108+, for amplitude modulation in a telecommunications transmitter.