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Forward Adaptation of Novel Semilogarithmic Quantizer and Lossless Coder for Speech Signals Compression
Volume 21, Issue 3 (2010), pp. 375–391
Zoran H. Peric   Milan S. Savic   Milan R. Dincic   Dragan B. Denic   Momir R. Prascevic  

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https://doi.org/10.15388/Informatica.2010.295
Pub. online: 1 January 2010      Type: Research Article     

Received
1 October 2009
Accepted
1 April 2010
Published
1 January 2010

Abstract

In this paper new semilogarithmic quantizer for Laplacian distribution is presented. It is simpler than classic A-law semilogarithmic quantizer since it has unit gain around zero. Also, it gives for 2.97 dB higher signal-to-quantization noise-ratio (SQNR) for referent variance in relation to A-law, and therefore it is more suitable for adaptation. Forward adaptation of this quantizer is done on frame-by-frame basis. In this way G.712 standard is satisfied with 7 bits/sample, which is not possible with classic A-law. Inside each frame subframes are formed and lossless encoder is applied on subframes. In that way, double adaptation is done: adaptation on variance within frames and adaptation on amplitude within subframes. Joined design of quantizer and lossless encoder is done, which gives better performances. As a result, standard G.712 is satisfied with only 6.43 bits/sample. Experimental results, obtained by applying this model on speech signal, are presented. It is shown that experimental and theoretical results are matched very well (difference is less than 1.5%). Models presented in this paper can be applied for speech signal and any other signal with Laplacian distribution.

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Keywords
semilogarithmic quantizer forward adaptive quantizer lossless coder

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INFORMATICA

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