US PATENT SUBCLASS 348 / 410
.~.~.~ Involving both PCM and DPCM encoding

Current as of: June, 1999
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384  DF  BANDWIDTH REDUCTION SYSTEM {7}
390  DF  .~ Bit-rate reduction {11}
409  DF  .~.~ Involving difference transmission (e.g., predictive) {5}
410.~.~.~ Involving both PCM and DPCM encoding

DEFINITION

Classification: 348/410

Involving both PCM and DPCM encoding:

(under subclass 409) Subject matter wherein the signal is sampled periodically and each sample is quantized and transmitted as a digital binary code with additional difference information transmitted as a digital binary code.