NDLI: Improving G.728's hybrid window and excitation gain

Content Provider	IEEE Xplore Digital Library
Author	Gang Zhang Keming Xie Xueying Zhang Liying Huangfu
Copyright Year	2004
Description	Author affiliation: Taiyuan Univ. of Technol., China (Gang Zhang; Keming Xie; Xueying Zhang; Liying Huangfu)
Abstract	The offset of gain filter is dealt unsuitably with a constant 32dB in G.728 standard. That is, the short-term stationary speech signal during the duration 20/spl sim/30ms is unsuitably supposed as stationary at whole time axis. It is necessary to design optimizing hybrid window for improving gain filter. In this work, the exact expression of excitation gain is conducted and an estimation method of SNR/sub av/, used to optimize the parameters of hybrid window is presented. On the basis of above, this paper combines the Jayant adaptive quantization and G.728's gain prediction to propose a scheme fit for designing gain codebook of LD-CELP, in which the exact gain value was adaptively predicted and quantized. In this method, for adaptive quantization gain of 3 bits and 4 bits, the SNR have been increased by 0.5 and 6 dB separately than that of G.728. If adopting 4 bits adaptive quantization and the shape codebook of 64 codevectors, the G.728' complexity could be reduced by 20% while SNR had 1 dB improvement.
Starting Page	185
Ending Page	188
File Size	238593
Page Count	4
File Format	PDF
ISBN	0780386604
DOI	10.1109/APCCAS.2004.1412723
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-12-06
Publisher Place	Taiwan
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Quantization Speech Adaptive filters Design optimization Optimization methods Shape Random processes Random sequences Nonlinear filters Adaptive algorithm
Content Type	Text
Resource Type	Article

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