Speech recognition in noise as a function of the number of spectral channels: Comparison of acoustic hearing and cochlear implants
Speech recognition in noise as a function of the number of spectral channels: Comparison of acoustic hearing and cochlear implants
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DOI：
10.1121/1.1381538
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发表时间：
2001-08-01
影响因子：
2.4
通讯作者：
Wang, X
中科院分区：
文献类型：
--
作者：
Friesen, LM;Shannon, RV;Wang, X
正常听力 (NH) 和人工耳蜗 (CI) 听者的语音识别能力是作为频谱分辨率（频谱通道数）和语音噪声比的函数来测量的。对 5 名正常听力听众、10 名佩戴 Nucleus-22 人工耳蜗的听众和 9 名佩戴 Advanced Bionics Clarion 人工耳蜗的听众测量了元音、辅音、单词和句子识别能力。识别率是在信噪比为 + 15、+ 10、+5、0 dB 和安静时测量的频谱通道（噪声带或电极）数量的函数。三种不同语音处理策略（SPEAK、CIS 和 SAS）的性能在所有条件下都相似，并且随着所有条件下电极数量的增加（最多七个或八个）而提高。对于所有噪声水平，SPEAK 语音处理器的元音和辅音识别在超过 7 个电极时都没有改善，而对于听力正常的听众来说，性能持续提高到至少 20 个通道。对较难的语音材料（单词和句子识别）的语音识别显示，Nucleus-22 听众从 7 个电极到 10 个电极略有增加。所有处理策略的平均植入分数低于具有类似处理的 NH 听众的分数。然而，最佳 CI 分数与该条件下的正常听力分数相似（最多七个通道）。当电极数量增加到七个时，具有最高性能水平的 CI 听众的性能有所提高，而当电极数量增加到四个以上时，语音识别水平较低的 CI 听众的性能没有提高。这些结果量化了频谱通道数量对噪声中语音识别的影响，并表明大多数 CI 受试者无法充分利用其植入物中使用的电极数量提供的频谱信息。 (C) 2001 年美国声学学会。
Speech recognition was measured as a function of spectral resolution (number of spectral channels) and speech-to-noise ratio in normal-hearing (NH) and cochlear-implant (CI) listeners. Vowel, consonant, word, and sentence recognition were measured in five normal -hearing listeners, ten listeners with the Nucleus-22 cochlear implant, and nine listeners with the Advanced Bionics Clarion cochlear implant. Recognition was measured as a function of the number of spectral channels (noise bands or electrodes) at signal-to-noise ratios of + 15, + 10, +5, 0 dB, and in quiet. Performance with three different speech processing strategies (SPEAK, CIS, and SAS) was similar across all conditions, and improved as the number of electrodes increased (up to seven or eight) for all conditions. For all noise levels, vowel and consonant recognition with the SPEAK speech processor did not improve with more than seven electrodes, while for normal-hearing listeners, performance continued to increase up to at least 20 channels. Speech recognition on more difficult speech materials (word and sentence recognition) showed a marginally significant increase in Nucleus-22 listeners from seven to ten electrodes. The average implant score on all processing strategies was poorer than scores of NH listeners with similar processing. However, the best Cl scores were similar to the normal-hearing scores for that condition (up to seven channels). CI listeners with the highest performance level increased in performance as the number of electrodes increased up to seven, while CI listeners with low levels of speech recognition did not increase in performance as the number of electrodes was increased beyond four. These results quantity the effect of number of spectral channels on speech recognition in noise and demonstrate that most Cl subjects are not able to fully utilize the spectral information provided by the number of electrodes used in their implant. (C) 2001 Acoustical Society, of America.