Simulations of tonotopically mapped speech processors for cochlear implant electrodes varying in insertion depth
Simulations of tonotopically mapped speech processors for cochlear implant electrodes varying in insertion depth
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DOI：
10.1121/1.1536928
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发表时间：
2003-02-01
影响因子：
2.4
通讯作者：
Stanton, D
中科院分区：
文献类型：
--
作者：
Faulkner, A;Rosen, S;Stanton, D
已经声称，使用耳蜗植入物的语音识别取决于语音处理器中的分析频带与电极位置处的特征频率（CF）的频率对准。然而，最顶端的电极位置通常可以具有1 kHz或更高的CF。使用在频率上与相对基础的电极阵列对准的滤波器导致较低频率语音信息的丢失。本研究模拟了频率对齐的语音处理器和常见的阵列插入深度，以评估这种损失的意义。噪声激励声码器模拟处理器驱动八个电极2毫米。分析滤波器的中心频率始终与模拟刺激部位的CF匹配。最顶端电极的模拟插入深度为。在距耳蜗基底25 mm（CF 502 Hz）和17 mm（CF 1851 Hz）之间以2 mm步长变化。辅音，元音和句子中的单词的识别都显示出显着下降，在三个更基础的每个之间。模拟电极配置。因此，如果植入体处理器使用与电极CF频率对齐的分析滤波器，则最顶端电极距离耳蜗基底19 mm（CF 1.3 kHz）或更小的患者将遭受语音信息的显著损失。(C)2003年美国声学学会。
It has been claimed that speech recognition with a cochlear implant, is dependent on the frequency alignment of analysis bands in the speech processor with characteristic frequencies (CFs) at electrode locations. However, the most apical electrode location can often have a CF of 1 kHz or more. The use of filters aligned in frequency to relatively basal electrode arrays leads to the loss of lower frequency speech information. This study simulates a frequency-aligned speech processor and common array insertion depths to assess this significance of this loss. Noise-excited vocoders simulated processors driving eight electrodes 2 mm apart. Analysis filters always had center frequencies matching the CFs of the simulated stimulation sites. The simulated insertion depth of the most apical electrode was. varied in 2-mm steps between 25 mm (CF 502 Hz) and 17 mm (CF 1851 Hz) from, the cochlear base. Identification of consonants, vowels, and words in sentences all showed a significant decline, between each of the three more basal. simulated electrode configurations. Thus, if implant processors used analysis filters frequency-aligned to electrode CFs, patients whose most apical electrode is 19 mm (CF 1.3 kHz) or less from the cochlear:base would suffer a significant loss of speech information. (C) 2003 Acoustical Society of America.