A detailed study on the effects of noise on speech intelligibility
A detailed study on the effects of noise on speech intelligibility
复制标题
DOI：
10.1121/1.2783131
复制
发表时间：
2007-11-01
影响因子：
2.4
通讯作者：
Houtgast, Tarnmo
中科院分区：
文献类型：
--
作者：
Dubbelboer, Finn;Houtgast, Tarnmo
语音的小波表示用于显示1/4倍频带内的瞬时幅值和相位，表示每个频带内的包络和载波。添加平稳噪声会改变小波模式，这可以理解为三个同时发生的影响的组合：两个影响小波水平（一个是系统的，一个是随机的），一个影响小波相位。特定类型的信号处理应用于语音，这允许每个影响包括或排除。每种效应（以及组合效应）对语音可理解性的影响用CVC测量。系统水平效应（即每个语音小波强度随平均噪声强度的增加）对语音可理解度的影响最大，这与调制传递函数和语音传输指数等指标一致。然而，随机电平波动和载波相位干扰的引入也严重降低了噪声下的可理解性。有人认为，这些随机效应是频谱减法作为提高语音可理解性的手段取得有限成功的原因。结果可为有效抑制语音可理解性提供线索。(c) 2007年美国声学学会。
A wavelet representation of speech was used to display the instantaneous amplitude and phase within 1/4 octave frequency bands, representing the envelope and the carrier within each band. Adding stationary noise alters the wavelet pattern, which can be understood as a combination of three simultaneously occurring subeffects: two effects on the wavelet levels (one systematic and one stochastic) and one effect on the wavelet phases. Specific types of signal processing were applied to speech, which allowed each effect to be either included or excluded. The impact of each effect (and of combinations) on speech intelligibility was measured with CVC's. It appeared that the systematic level effect (i.e., the increase of each speech wavelet intensity with the mean noise intensity) has the most degrading effect on speech intelligibility, which is in accordance with measures such as the modulation transfer function and the speech transmission index. However, also the introduction of stochastic level fluctuations and disturbance of the carrier phase seriously contribute to reduced intelligibility in noise. It is argued that these stochastic effects are responsible for the limited success of spectral subtraction as a means to improve speech intelligibility. Results can provide clues for effective noise suppression with respect to intelligibility. (c) 2007 Acoustical Society of America.