Effects of electrode separation between speech and noise signals on consonant identification in cochlear implants.
Effects of electrode separation between speech and noise signals on consonant identification in cochlear implants.
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DOI：
10.1121/1.3257200
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发表时间：
2009-12
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影响因子：
--
通讯作者：
B. Kwon
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文献类型：
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作者：
B. Kwon
本研究的目的是考察人工耳蜗术使用者在不同语音和噪声电极分离程度下对语音和背景噪声的感知分离。使用一种名为“多数据流处理”的实验性处理方案，对11名使用Nucus CI系统的用户进行辅音识别测试，在该方案中，语音和噪声刺激被分开处理并交织。语音被呈现给十个电极(每隔一个电极)或六个电极(每四个电极)。噪声被引导到相同的电极(“重叠”条件)或不同的一组电极(“隔行扫描”条件)，在10个和6个电极的呈现中，语音和噪声电极分别由一个和两个电极间距隔开。结果表明，在两个受试者中，在两个电极间隔(约1.1 mm)的交错条件下，辅音识别有轻微但显著的改善(5%-10%)。结果似乎受到外周通道相互作用的影响，部分原因是个体的可变性。虽然总体效果很小，并且从少数受试者身上观察到，但本研究表明，如果在呈现这些声音时有足够的外围分离，则CI用户将目标与背景分离的表现可能会得到改善。
The aim of the present study was to examine cochlear implant (CI) users' perceptual segregation of speech from background noise with differing degrees of electrode separation between speech and noise. Eleven users of the nucleus CI system were tested on consonant identification using an experimental processing scheme called "multi-stream processing" in which speech and noise stimuli were processed separately and interleaved. Speech was presented to either ten (every other electrode) or six electrodes (every fourth electrode). Noise was routed to either the same (the "overlapped" condition) or a different set of electrodes (the "interlaced" condition), where speech and noise electrodes were separated by one- and two-electrode spacings for ten- and six-electrode presentations, respectively. Results indicated a small but significant improvement in consonant recognition (5%-10%) in the interlaced condition with a two-electrode spacing (approximately 1.1 mm) in two subjects. It appears that the results were influenced by peripheral channel interactions, partially accounting for individual variability. Although the overall effect was small and observed from a small number of subjects, the present study demonstrated that CI users' performance on segregating the target from the background might be improved if these sounds were presented with sufficient peripheral separation.