US PATENT SUBCLASS 375 / 265
.~.~.~ Trellis encoder or Trellis decoder

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

259  DF  SYSTEMS USING ALTERNATING OR PULSATING CURRENT {4}
260  DF  .~ Plural channels for transmission of a single pulse train {2}
261  DF  .~.~ Quadrature amplitude modulation {4}
265.~.~.~ Trellis encoder or Trellis decoder

DEFINITION

Classification: 375/265

Trellis encoder or Trellis decoder:

(under subclass 261) Subject matter for improving the noise immunity of digital transmission system without bandwidth expansion or reduction of data rate.

(1) Note. The encoder employs redundant nonbinary modulation in combination with a finite-state encoder which governs the selection of modulation signals to generate the coded signal sequence.