Authors: Despotović, Vladimir
Perić, Zoran
Velimirović, Lazar 
Delić, Vlado
Title: DPCM with forward gain-adaptive quantizer and simple switched predictor for high quality speech signals
Journal: Advances in Electrical and Computer Engineering
Volume: 10
Issue: 4
First page: 95
Last page: 98
Issue Date: 1-Nov-2010
Rank: M23
ISSN: 1582-7445
DOI: 10.4316/aece.2010.04015
In this article DPCM (Differential Pulse Code Modulation) speech coding scheme with a simple switched first order predictor is presented. Adaptation of the quantizer to the signal variance is performed for each particular frame. Each frame is classified as high or low correlated, based on the value of the correlation coefficient, then the selection of the appropriate predictor coefficient and bitrate is performed. Low correlated frames are encoded with a higher bitrate, while high correlated frames are encoded with a lower bitrate without the objectionable loss in quality. Theoretical model and experimental results are provided for the proposed algorithm.
Keywords: Adaptive quantization | Companding | Correlation | Prediction | Speech processing
Publisher: University of Suceava
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 

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