Quality ratings for frequency-shaped peak-clipped speech: results for listeners with hearing loss.
Quality ratings for frequency-shaped peak-clipped speech: results for listeners with hearing loss.
复制标题
频率整形削峰语音的质量评级：听力损失听众的结果。
DOI：
10.1044/jshr.3906.1115
复制
发表时间：
1996
期刊：
影响因子：
--
通讯作者：
Revoile,SG
中科院分区：
文献类型：
--
作者：
Kozma-Spytek,L;Kates,JM;Revoile,SG
削峰是助听器中常见的失真形式，会降低放大后的语音的主观质量。在先前一项涉及听力正常的听者的研究中(Kates&Kozma-Spytek，1994)，使用使用三种不同频率响应等值线过滤然后以四种不同的限幅水平进行限幅的句子测试材料来研究峰值限幅对语音质量评级的影响。本研究将质量评级扩展到包括一组有中度到重度听力障碍的听众。实验结果表明，限幅水平以及频率响应整形和限幅水平的交互作用对语音质量有显著影响。研究还表明，对于听力受损的听者来说，失真对语音质量的影响可以由语音处理系统对整形噪声输入信号的幅度平方相干性计算得到的失真指数来模拟。然而，为听力受损的听众组得出的失真指数权重与为听力正常的听众得出的失真指数权重有很大的不同，并且也观察到听众之间的显著差异。
Peak clipping is a common form of distortion in hearing aids and can reduce the subjective quality of the amplified speech. In a previous study involving listeners with normal hearing Kates & Kozma-Spytek, 1994), the effect of peak clipping on speech quality ratings was studied using sentence test materials that were filtered using three different frequency response contours and then clipped at four different clipping levels. The present study extends the quality ratings to include those from a group of listeners having moderate to profound hearing impairments. The experimental results indicate that the clipping level, and the interaction of the frequency-response shaping with the clipping level, significantly affects speech quality. It is also shown that the distortion effects on speech quality for the listeners with impaired hearing can be modeled by a distortion index computed from the magnitude-squared coherence of the speech-processing system in response to a shaped-noise input signal. The distortion-index weights derived for the group of listeners with impaired hearing, however, differ substantially from those derived for listeners with normal hearing, and substantial inter-listener variation was also observed.