On a low bit rate speech coder using multi-level amplitude algebraic method

Chan-Joong Jung, Young-Ho Park, M. Bae
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Abstract

This paper analyzes the dynamic sparse algebraic codebook used to model a residual signal for ACELP. It proposes an improved algebraic codebook structure with a new searching process. The proposed algorithm improves the disadvantage of an algebraic codebook without computation increment. First, this paper makes it possible to select various pulse amplitudes differently from the conventional method which looks up the sign bit simply. In addition, two pulses are selected on the same track and the delay of the LP is minimized at the transient period when the LSF interpolation is performed using a transient detector from unvoiced to voiced speech without additional computation. For telephone line speech quality, a 5.6 kbps speech coder using the proposed algorithm was equivalent to the 6.3 kbps MP-MLQ from the viewpoint of subjective speech quality. For objective quality, however, the degradation was MNRU Q=15 dB compared to MP-MLQ where MNRU Q=15 dB.
基于多级幅度代数方法的低比特率语音编码器
本文分析了用于ACELP残差信号建模的动态稀疏代数码本。提出了一种改进的代数码本结构和一种新的搜索过程。该算法改善了代数码本无计算增量的缺点。首先,与传统的查找符号位的方法不同,该方法可以选择不同的脉冲幅度。此外,在同一轨道上选择两个脉冲,使用瞬态检测器从静音语音到浊音语音进行LSF插值时,在不需要额外计算的情况下,最小化了LP在瞬态期间的延迟。对于电话线语音质量,从主观语音质量的角度来看,使用该算法的5.6 kbps语音编码器相当于6.3 kbps的MP-MLQ。然而,对于客观质量,与MNRU Q=15 dB的MP-MLQ相比,MNRU Q=15 dB的退化是MNRU Q=15 dB。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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