US PATENT SUBCLASS 359 / 184
.~.~.~ Pulse modulation

Current as of: June, 1999
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359 /   HD   OPTICS: SYSTEMS (INCLUDING COMMUNICATION) AND ELEMENTS

109  DF  OPTICAL COMMUNICATION {13}
180  DF  .~ Transmitter {3}
181  DF  .~.~ With particular modulation {3}
184.~.~.~ Pulse modulation {2}
185  DF  .~.~.~.~> Pulse-code
186  DF  .~.~.~.~> Pulse time

DEFINITION

Classification: 359/184

Pulse modulation:

(under subclass 181) Subject matter wherein the carrier signal is transmitted in a series of pulses, having a normally constant value with a variation of a rise and a decay approaching infinitesimal duration, to convey the information contained in the modulating signal.

(1) Note. This subclass includes pulse amplitude, delta, and pulse frequency modulation.

(2) Note. Pulse amplitude modulation uses the amplitude of the transmitted carrier signal to convey the information contained in the modulating signal.

(3) Note. A delta pulse code modulation converts audio signals into corresponding trains of digital pulses to provide greater freedom from interference during transmission.

(4) Note. Pulse frequency modulation varies the transmitted pulse repetition rate as a function of the instantaneous value of the information signal (i.e., modulating signal).

SEE OR SEARCH THIS CLASS, SUBCLASS:

186, for pulse time modulation.

SEE OR SEARCH CLASS 327, Miscellaneous Active Electrical Nonlinear Devices, Circuits, and Systems,

100+, for miscellaneous pulse parameter (e.g., amplitude) control.

329, Demodulators,

311+, for electrical pulse demodulators.

332, Modulators,

106+, for electrical pulse modulators.

370, Multiplex Communications,

533, for multiplexers/distributors using pulse amplitude modulation.

375, Pulse or Digital Communications,

353, for electrical pulse amplitude modulation. Subclasses 259+, 301+, and 321+ for pulse or digital communications via modulated carrier waves.