Analysis of speech-based speech transmission index methods with implications for nonlinear operations
Analysis of speech-based speech transmission index methods with implications for nonlinear operations
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DOI：
10.1121/1.1804628
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发表时间：
2004-12-01
影响因子：
2.4
通讯作者：
Greenberg, JE
中科院分区：
文献类型：
--
作者：
Goldsworthy, RL;Greenberg, JE
语音传输指数（STI）是一种物理指标。与由于加性噪声和混响而降低的语音的可懂度良好相关的度量。传统的STI使用调制噪声作为探测信号，并且对于评估由对语音信号的线性操作导致的劣化是有效的。研究人员试图通过提出使用语音作为探测信号的变化来扩展STI以预测非线性处理的语音的可懂度。这项工作考虑了四个以前提出的基于语音的STI方法和四种新的方法，研究条件下的加性噪声，混响，和两个非线性操作（包络阈值和谱减法）。分析STI计算中的中间度量揭示了为什么某些方法在非线性操作中失败。结果表明，没有一个先前提出的方法是足够的所有考虑的条件下，而四个建议的方法产生定性合理的结果，值得进一步研究。讨论认为这项工作的相关性，以预测耳蜗植入处理语音的可懂度。(C)2004年，美国声学学会。
The Speech Transmission Index (STI) is a physical. metric that is well correlated with the intelligibility of speech degraded by additive noise and reverberation. The traditional STI uses modulated noise as a probe signal and is valid for assessing degradations that result from linear operations on the speech signal. Researchers have attempted to extend the STI to predict the intelligibility of nonlinearly processed speech by proposing variations that use speech as a probe signal. This work considers four previously proposed speech-based STI methods and four novel methods, studied under conditions of additive noise, reverberation, and two nonlinear operations (envelope thresholding and spectral subtraction). Analyzing intermediate metrics in the STI calculation reveals why some methods fail for nonlinear operations. Results indicate that none of the previously proposed methods is adequate for all of the conditions considered, while four proposed methods produce qualitatively reasonable results and warrant further study. The discussion considers the relevance of this work to predicting the intelligibility of cochlear-implant processed speech. (C) 2004 Acoustical Society of America.