Analysis of Two-stage Quantizer with Embedded G. 711 Quantizer and Segmental Uniform Quantizer

Authors

  • Z. Perić University of Niš, Faculty of Electronic Engineering
  • J. Nikolić University of Niš, Faculty of Electronic Engineering
  • J. Lukić University of Niš, Faculty of Electronic Engineering
  • D. Denić University of Niš, Faculty of Electronic Engineering

DOI:

https://doi.org/10.5755/j01.eee.19.2.1107

Keywords:

G.711 quantizer, Speech signal quality improvement, Two-stage quantizer model

Abstract

In this paper a novel two-stage quantizer with the embedded G.711 quantizer is proposed for speech signal processing. The first processing stage, where the input signal is quantized with the G.711 quantizer, is followed by the second stage where the segmental uniform quantizer performs the reduction of the quantization error introduced in the first stage. In this way higher signal quality, measured by signal to quantization noise ratio, is achieved in comparison with the G.711 quantizer while no bit rate reduction is performed. Particularly, in the second stage two additional bits are introduced. Although the expected quality gain, as a result of increasing the overall bit rate for 2 bit/sample, is around 12 dB, the gain achieved with the proposed quantizer is 14 dB. This additional quality gain of 2 dB proves the advantage of the proposed two-stage quantizer.

DOI: http://dx.doi.org/10.5755/j01.eee.19.2.1107

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Published

2013-01-28

How to Cite

Perić, Z., Nikolić, J., Lukić, J., & Denić, D. (2013). Analysis of Two-stage Quantizer with Embedded G. 711 Quantizer and Segmental Uniform Quantizer. Elektronika Ir Elektrotechnika, 19(2), 88-91. https://doi.org/10.5755/j01.eee.19.2.1107

Issue

Vol. 19 No. 2 (2013)

Section

TELECOMMUNICATIONS ENGINEERING

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