US PATENT SUBCLASS 375 / 242
PULSE CODE MODULATION


Current as of: June, 1999
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375 /   HD   PULSE OR DIGITAL COMMUNICATIONS

242PULSE CODE MODULATION {4}
243  DF  .~> Correcting or reducing quantizing errors
244  DF  .~> Differential {3}
253  DF  .~> Length coding
254  DF  .~> Noise or distortion reduction


DEFINITION

Classification: 375/242

PULSE CODE MODULATION:

(under the class definition) Subject matter in which a signal to be transmitted is sampled or compared and then converted into a digital pulse train which represents the amplitude of the sampled signal at the instant of sampling or comparison, and this digital pulse train is transmitted so it may be reconverted into a duplicate of the original signal at a receiver.

SEE OR SEARCH CLASS

332, Modulators,

106+, for a pulse modulator, per se.

341, Coded Data Generation or Conversion, for code converters to convert from analog or digital information appropriate subclasses to pulse code.

348, Television,

488+, for pulse code modulation television transmission.

370, Multiplex Communications, appropriate subclass for pulse code type modulation.