DPCM


Also found in: Dictionary, Thesaurus, Medical, Financial, Acronyms, Wikipedia.

DPCM

McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

DPCM

(Differential PCM) A PCM technique that codes the difference between sample points to compress the digital data. Because audio waves propagate in predictable patterns, DPCM predicts the next sample and codes the difference between the prediction and the actual point. The differences are smaller numbers than the numerical value of each sample on the full scale and thereby reduce the resulting bitstream. See PCM, ADPCM and sampling.
Copyright © 1981-2019 by The Computer Language Company Inc. All Rights reserved. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction is strictly prohibited without permission from the publisher.
References in periodicals archive ?
During the interframe coding mode, the DPCM is in operation.
Linear prediction [8], [9], where the prediction of the current sample is calculated as the linear combination of the previous samples, is the basis of a DPCM system.
The reason for using the DPCM structure is that for most sources of practical interest, the variance of the prediction error is substantially smaller than that of the source.
After zigzag scanning the coefficients in each block, the quantized DC coefficients are encoded by differential pulse code modulation (DPCM), and the quantized AC coefficients are encoded by run length coding (RLC).
One of the common preprocessors to entropy coding is differential pulse code modulation (DPCM) [4].
As for coefficient matrix of every sub-image, DC coefficient is coded by differential pulse code modulation (DPCM), and AC coefficients are put in a one-dimensional array with Zig-zag ordering.
DPCM technique is based on the linear prediction, where the prediction of the current sample is calculated as the linear combination of previous samples [1]-[4].
After quantization, the DC coefficient of each block is coded in a differential pulse code modulation (DPCM).
[17] proposed a framework of quantization via simple uniform SQ coupled with Differential Pulse Code Modulation (DPCM) of the CS measurements, and its surprisingly competitive rate-distortion performance breaks a new path for quantizing CS measurements of image.