Reference : Dual-mode quasi-logarithmic quantizer with embedded G.711 codec
Scientific journals : Article
Engineering, computing & technology : Computer science
Dual-mode quasi-logarithmic quantizer with embedded G.711 codec
Denic, Bojan [University of Nis > Faculty of Electronic Engineering]
Peric, Zoran [University of Nis > Faculty of Electronic Engineering]
Despotovic, Vladimir mailto [University of Belgrade > Technical Faculty in Bor]
Vucic, Nikola [University of Nis > Faculty of Electronic Engineering]
Petrovic, Predrag [Institute IRITEL, Belgrade]
Journal of Electrical Engineering
Slovenska Technika Univerzita
Yes (verified by ORBilu)
[en] Scalar quantization ; G.711 standard ; Laplacian source ; Signal to noise ratio
[en] The G.711 codec has been accepted as a standard for high quality coding in many applications. A dual-mode quantizer, which combines the nonlinear logarithmic quantizer for restricted input signals and G.711 quantizer for unrestricted input signals is proposed in this paper. The parameters of the proposed quantizer are optimized, where the minimal distortion is used as the criterion. It is shown that the optimized version of the proposed quantizer provides 5.4 dB higher SQNR (Signal to Quantization Noise Ratio) compared to G.711 quantizer, or equivalently it performs savings in the bit rate of approximately 0.9 bit/sample for the same signal quality. Although the complexity is slightly increased, we believe that due to the superior performance it can be successfully implemented for high-quality quantization.
Ministry of Education and Science of the Republic of Serbia

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