Two-microphone spatial filtering provides speech reception benefits for cochlear implant users in difficult acoustic environments
Two-microphone spatial filtering provides speech reception benefits for cochlear implant users in difficult acoustic environments
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DOI：
10.1121/1.4887453
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发表时间：
2014-08-01
影响因子：
2.4
通讯作者：
Braida, Louis D.
中科院分区：
文献类型：
--
作者：
Goldsworthy, Raymond L.;Delhorne, Lorraine A.;Braida, Louis D.
本文介绍并提供了一种基于耳后壳中两个紧密间隔（类似于1厘米）麦克风的空间滤波算法的评估。评估后的空间滤波算法使用快速（类似于10毫秒）时间谱分析来确定传入声音的位置，并增强从听者正前方传来的声音。在全向响应、偶极子定向响应和空间滤波算法三种处理条件下，对8名人工耳蜗使用者的语音接收阈值（srt）进行了测量。背景噪声条件使用三个同时时间反转的语音信号作为位于90度，180度和270度的干扰。结果表明，与具有多个噪声源的混响室内的全向响应相比，该空间滤波算法可提供5.8 ~ 10.7 dB SRT的语音接收优势。考虑到观察到的SRT优势，再加上高效的设计，所提出的算法有望成为一种CI降噪解决方案。(C) 2014年美国声学学会。
This article introduces and provides an assessment of a spatial-filtering algorithm based on two closely-spaced (similar to 1 cm) microphones in a behind-the-ear shell. The evaluated spatial-filtering algorithm used fast (similar to 10 ms) temporal-spectral analysis to determine the location of incoming sounds and to enhance sounds arriving from straight ahead of the listener. Speech reception thresholds (SRTs) were measured for eight cochlear implant (CI) users using consonant and vowel materials under three processing conditions: An omni-directional response, a dipole-directional response, and the spatial-filtering algorithm. The background noise condition used three simultaneous time-reversed speech signals as interferers located at 90 degrees, 180 degrees, and 270 degrees. Results indicated that the spatial-filtering algorithm can provide speech reception benefits of 5.8 to 10.7 dB SRT compared to an omni-directional response in a reverberant room with multiple noise sources. Given the observed SRT benefits, coupled with an efficient design, the proposed algorithm is promising as a CI noise-reduction solution. (C) 2014 Acoustical Society of America.