Understanding speech in modulated interference: Cochlear implant users and normal-hearing listeners
Understanding speech in modulated interference: Cochlear implant users and normal-hearing listeners
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DOI：
10.1121/1.1531983
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发表时间：
2003-02-01
影响因子：
2.4
通讯作者：
Nelson, DA
中科院分区：
文献类型：
--
作者：
Nelson, PB;Jin, SH;Nelson, DA
真实环境中的许多相互竞争的噪声都是调制的或在水平上波动的。听力正常的听众能够利用波动的掩蔽物中的时间间隔。有感音神经性听力损失的听者从调制掩蔽器中获益较少。由于有限的频谱分辨率以及对植入物处理器基于包络的信号处理策略的依赖，人工耳蜗使用者可能会受到调制掩蔽物的更不利影响。目前的研究评估了人工耳蜗者在存在调制语音形状噪声的情况下理解句子的能力。听力正常的听者作为对照组。听者在安静、稳定的噪音和调制的噪音掩蔽器中重复IEEE句子。在从1到32赫兹的6个调制速率下，以不同的信噪比(SNR)呈现掩模。结果表明，听力正常的听众从掩蔽中获得了显著的释放。来自调制掩码，特别是在8赫兹掩码调制下的频率。相比之下，人工耳蜗者从调制掩蔽器的掩蔽中体验到的释放很少。这些数据表明，事实上，它们可能在音节调制速率(2-4赫兹)下表现出调制掩蔽的负面影响。植入听者使用三种不同的设备，采用不同的语音处理器策略，得到了类似的结果模式。缺乏从掩蔽中释放的情况发生在植入听者中，与他们的设备特性无关，并且可能归因于植入处理策略的性质和/或在处理的刺激中缺乏光谱细节。(C)2003年美国声学学会。
Many competing noises in real environments are modulated or fluctuating in level. Listeners with normal hearing are able to take advantage of temporal gaps in fluctuating maskers. Listeners with sensorineural hearing loss show less benefit from modulated maskers. Cochlear implant users may be more adversely affected by modulated maskers because of their limited spectral resolution and by their reliance on envelope-based signal-processing strategies of implant processors. The current study evaluated cochlear implant users' ability to understand sentences in the presence of modulated speech-shaped noise.: Normal-hearing listeners served as a comparison group. Listeners repeated IEEE sentences in quiet, steady noise, and modulated noise maskers. Maskers were presented at varying signal-to-noise ratios (SNRs) at six modulation rates varying from 1 to 32 Hz. Results suggested that,normal-hearing listeners, obtain significant release from masking. from modulated maskers, especially at 8-Hz masker modulation, frequency. In contrast, cochlear implant users experience very little release from masking from modulated maskers. The data suggest, in fact, that they may show negative effects of modulated maskers at syllabic modulation rates (2-4 Hz). Similar patterns of results were obtained from implant listeners using three different devices with different speech-processor strategies. The lack of release from masking occurs in implant listeners independent of their device characteristics, and may be attributable to the nature of implant processing strategies and/or the lack of spectral detail in processed stimuli. (C) 2003 Acoustical Society of America.