Dual-mode quasi-logarithmic quantizer with embedded G.711 codec

Bojan Denić, Zoran Perić, Vladimir Despotović, Nikola Vučić, Predrag Petrović

Research output: Contribution to journalArticleResearchpeer-review

1 Citation (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)46-51
Number of pages6
JournalJournal of Electrical Engineering
Volume69
Issue number1
DOIs
Publication statusPublished - 1 Jan 2018
Externally publishedYes

Keywords

  • G.711 standard
  • Laplacian source
  • scalar quantization
  • signal to noise ratio

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