Intraframe quantization of speech line spectrum pairs for code‐excited linear prediction based coders in packet networks
Fatiha Merazka · Transactions on Emerging Telecommunications Technologies · 2012
ABSTRACT This paper proposes intraframe quantization schemes of line spectrum pair parameters to improve frame erasures for the ITU‐T G.723.1 coder. The standard ITU‐T G.723.1 coder uses an interframe quantization of the line spectrum pair parameters, which causes error propagation to the next frames. Simulation results show that our intraframe quantization schemes coding is much more robust to frame erasures than the embedded method in ITU‐T G.723.1, and a typical improvement of 0.4 dB on average spectral distortion can be obtained with 40% packet loss. Enhanced modified bark spectral distortion tests, under various packet loss conditions, confirm that our proposed method is superior to the interframe algorithm embedded in the ITU‐T G.723.1 coder of over 1.6. Copyright © 2012 John Wiley & Sons, Ltd.