Authors: Despotović, Vladimir
Perić, Zoran
Velimirović, Lazar 
Delić, Vlado
Title: Switched adaptive quantiser for speech compression based on optimal companding and correlation
Journal: IET Signal Processing
Volume: 5
Issue: 7
First page: 701
Last page: 707
Issue Date: 1-Oct-2011
Rank: M23
ISSN: 1751-9675
DOI: 10.1049/iet-spr.2010.0308
This study describes a novel adaptive quantiser based on the optimal companding technique. Adaptation is achieved by adjusting the input of the fixed or non-adaptive quantiser according to the estimated and quantised gain on each particular frame. In such a way better quantiser adaptation to the varying input statistics is provided. Selection of the appropriate bit rate is performed depending on the value of the correlation coefficient ρ on each frame. The decision thresholds for ρ are determined under the condition that the signal to quantisation noise ratio does not drop under 34.3 dB, satisfying the G.712 standard quality of speech, while decreasing the bit rate. The information about the gain and about the chosen bit rate is then transferred as a side information to a decoder. Although this slightly increases the side information, the overall savings in the bit rate have shown to be substantial. Theoretical and experimental results are provided, which point out the benefits that can be achieved using the proposed algorithm.
Keywords: Switched adaptive quantiser | Optimal companding | Uniform gain quantisation | Log-uniform gain quantisation
Publisher: IET
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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