Speech recognition with the advanced combination encoder and transient emphasis spectral maxima strategies in nucleus 24 recipients
Speech recognition with the advanced combination encoder and transient emphasis spectral maxima strategies in nucleus 24 recipients
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DOI：
10.1044/1092-4388(2005/047
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发表时间：
2005-06-01
影响因子：
2.6
通讯作者：
Holden, TA
中科院分区：
文献类型：
--
作者：
Holden, LK;Vandali, AE;Holden, TA
人工耳蜗（CI）受者面临的困难之一是对低强度语音线索的感知。A. E. Vandali（2001）开发了瞬态重音谱最大值（TESM）策略来放大短持续时间、低水平的声音。本研究的目的是确定TESM的语音得分是否会明显高于使用优化软语和其他声音感知的高级组合编码器（ACE）策略。8名核24 Cl系统的成年受者参与了这项研究。在55和65 dB声压下的辅音-元音核辅音（CNC）单词、在2种不同信噪比下的65 dB声压下的噪声句子，以及在60 dB声压下的闭合元音和辅音句子，ACE和TESM的得分均无显著差异。然而，在较低水平（55 dB SPL）下，TESM对CNC单词中停止辅音的感知显著高于ACE。此外，在55db声压下，使用TESM的单词在方式和辅音位置上的信息传输百分比显著高于ACE。对60 dB声压下的闭集辅音的分析显示，TESM组的方式信息传递率明显高于ACE组。与Vandali对Nucleus 22cl系统接受者的报告相比，TESM的这些改善很小。看来，用于编程语音处理器的映射技术和Nucleus 24系统的改进处理能力，使得ACE和TESM几乎同样能理解柔和的声音。然而，一半的参与者在日常生活中更喜欢使用TESM而不是ACE，除了我之外，所有人都在特定的听力情境中使用TESM。在临床上，TESM可能有助于确保低强度、短时间的声音线索的可听性，这对理解语音很重要，对于难以定位的接受者，或者如果时间不足，无法使用定位技术来增加软音的可听性。
One of the difficulties faced by cochlear implant (CI) recipients is perception of low-intensity speech cues. A. E. Vandali (2001) has developed the transient emphasis spectral maxima (TESM) strategy to amplify short-duration, low-level sounds. The aim of the present study was to determine whether speech scores would be significantly higher with TESM than with the advanced combination encoder (ACE) strategy fitted using procedures that optimize perception of soft speech and other sounds. Eight adult recipients of the Nucleus 24 Cl system participated in this study. No significant differences in scores were seen between ACE and TESM for consonant-vowel nucleus-consonant (CNC) words presented at 55 and 65 dB SPL, for sentences in noise presented at 65 dB SPL at 2 different signal-to-noise ratios, or for closed-set vowels and consonants presented at 60 dB SPL. However, perception of stop consonants within CNC words presented at the lower level (55 dB SPL) was significantly higher with TESM than ACE. In addition, percentage of information transmitted for words at 55 dB SPL was significantly higher with TESM than with ACE for manner and voicing features for consonants in the initial word position. Analysis of closed-set consonants presented at 60 dB SPL revealed percentage of information transmitted for manner was significantly higher with TESM than with ACE. These improvements with TESM were small compared with those reported by Vandali for recipients of the Nucleus 22 Cl system. It appears that mapping techniques used to program speech processors and improved processing capabilities of the Nucleus 24 system contributed to soft sounds being understood almost as well with ACE as with TESM. However, half of the participants preferred TESM to ACE for use in everyday life, and all but 1 used TESM in specific listening situations. Clinically, TESM may be useful to ensure the audibility of low-intensity, short-duration acoustic cues that are important for understanding speech, for recipients who are difficult to map, or if insufficient time precludes the use of mapping techniques to increase audibility of soft sound.