Authors: Perić, Zoran
Jocić, Aleksandar
Nikolić, Jelena
Velimirović, Lazar 
Denić, Dragan
Affiliations: Mathematical Institute of the Serbian Academy of Sciences and Arts 
Title: Analysis of differential pulse code modulation with forward adaptive lloyd-max's quantizer for low bit-rate speech coding
Journal: Revue Roumaine des Sciences Techniques Serie Electrotechnique et Energetique
Volume: 58
Issue: 4
First page: 424
Last page: 434
Issue Date: 1-Oct-2013
Rank: M23
ISSN: 0035-4066
In this paper, a DPCM (Differential Pulse Code Modulation) system with forward adaptive Lloyd-Max's quantizer is presented. This quantizer is designed for low bit rate, where the first and the second order linear predictors are used in the proposed DPCM system solution. It is shown how SQNR (Signal to Quantization Noise Ratio) and Gp (Prediction Gain) depend on the correlation coefficients of the predictor of the first and the second order. The obtained experimental values of parameters SQNR and Gp are presented and compared with the corresponding theoretical values for the given system. In this manner the selection of optimal DPCM system correlation coefficients values is performed and the possibilities of this DPCM system application in the speech coding are indicated.
Keywords: Coefficient | Correlation | Differential pulse code modulation (DPCM) | Forward adaptation | Lloyd-Max's quantizer | Prediction gain | Predictor | Signal to quantization noise ratio
Publisher: Editura Academiei Romane
Project: Development of new information and communication technologies, based on advanced mathematical methods, with applications in medicine, telecommunications, power systems, protection of national heritage and education 
Development and hardware implementation of new absolute encoder type for position and angular velocity measurement 

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