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首页> 美国卫生研究院文献>Trends in Hearing >Searching for the Sound of a Cochlear Implant: Evaluation ofDifferent Vocoder Parameters by Cochlear Implant Users With Single-SidedDeafness
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Searching for the Sound of a Cochlear Implant: Evaluation ofDifferent Vocoder Parameters by Cochlear Implant Users With Single-SidedDeafness

机译：寻找人工耳蜗的声音：评估单侧人工耳蜗用户的不同声码器参数耳聋

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摘要

Cochlear implantation in subjects with single-sided deafness (SSD) offers a unique opportunity to directly compare the percepts evoked by a cochlear implant (CI) with those evoked acoustically. Here, nine SSD-CI users performed a forced-choice task evaluating the similarity of speech processed by their CI with speech processed by several vocoders presented to their healthy ear. In each trial, subjects heard two intervals: their CI followed by a certain vocoder in Interval 1 and their CI followed by a different vocoder in Interval 2. The vocoders differed either (i) in carrier type—(sinusoidal [SINE], bandfiltered noise [NOISE], and pulse-spreading harmonic complex) or (ii) in frequency mismatch between the analysis and synthesis frequency ranges—(no mismatch, and two frequency-mismatched conditions of 2 and 4 equivalent rectangular bandwidths [ERBs]). Subjects had to state in which of the two intervals the CI and vocoder sounds were more similar. Despite a large intersubject variability, the PSHC vocoder was judged significantly more similar to the CI than SINE or NOISE vocoders. Furthermore, the No-mismatch and 2-ERB mismatch vocoders were judged significantly more similar to the CI than the 4-ERB mismatch vocoder. The mismatch data were also interpreted by comparing spiral ganglion characteristicfrequencies with electrode contact positions determined from postoperativecomputed tomography scans. Only one subject demonstrated a pattern of preferenceconsistent with adaptation to the CI sound processor frequency-to-electrodeallocation table and two subjects showed possible partial adaptation. Thosesubjects with adaptation patterns presented overall small and consistentfrequency mismatches across their electrode arrays.
机译：单侧耳聋（SSD）受试者的人工耳蜗植入提供了独特的机会，可以直接将人工耳蜗（CI）诱发的感觉与听觉诱发的感觉进行比较。在这里，九个SSD-CI用户执行了一项强制选择任务，评估了其CI处理的语音与呈现给其健康耳朵的几个声码器处理的语音的相似性。在每个试验中，受试者都听到两个间隔：间隔1中的CI，然后是某个声码器；间隔2中，CI，之后是不同的声码器。声码器在（i）载波类型方面有所不同-（正弦[SINE]，带滤噪声[噪声]和脉冲扩展谐波复数）或（ii）分析和合成频率范围之间的频率不匹配-（没有不匹配，以及两个频率不匹配的条件，即2个和4个等效矩形带宽[ERB]）。受试者必须声明CI和声码器声音在两个间隔中的哪个更相似。尽管受试者之间存在很大的差异，但PSHC声码器被认为与CI相比比SINE或NOISE声码器更加相似。此外，与4-ERB失配声码器相比，No不匹配和2-ERB失配声码器被认为与CI更加相似。还通过比较螺旋神经节特征来解释失配数据电极接触位置的频率由术后确定计算机断层扫描。只有一个对象表现出偏好模式符合CI声音处理器的电极频率分配表和两个受试者显示出可能的部分适应。那些具有适应模式的科目总体上较小且一致电极阵列上的频率不匹配。

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