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Entropy-Coded Adaptive Differential Pulse-Code Modulation (DPCM) for Speech

open access: closedIEEE Transactions on Communications, 1974
A study of combining two ways of reducing the redundancy in the digital representation of speech signals is presented. Differential pulse-code modulation (DPCM) encodes the signal into digital form and reduces the redundancy due to correlation in adjacent sample values of the signal.
K. Virupaksha, J. O'Neal
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A Unified Representation of Differential Pulse-Code Modulation (DPCM) and Transform Coding Systems

open access: closedIEEE Transactions on Communications, 1974
We consider a transform coding system that uses a lower-triangular transformation to uncorrelate the data. Based on this transformation we propose a generalized differential pulse code modulation (DPCM) system and show that at high bit rates it performs almost as well as coding by the method of principal components (Karhunen-Loeve transformation). This
A. Habibi, R. Hershel
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