Effects of noise and spectral resolution on vowel and consonant recognition: Acoustic and electric hearing
Effects of noise and spectral resolution on vowel and consonant recognition: Acoustic and electric hearing
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DOI：
10.1121/1.423941
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发表时间：
1998-12-01
影响因子：
2.4
通讯作者：
Wang, XS
中科院分区：
文献类型：
--
作者：
Fu, QJ;Shannon, RV;Wang, XS
当前的多通道耳蜗植入设备在安静的环境中提供高水平的语音性能。然而，随着背景噪声水平的增加，性能迅速恶化。本研究的目的是调查人工耳蜗植入者的噪声敏感性是否主要是由于精细频谱信息的丢失。识别元音和辅音的测量作为一个函数的信噪比在四个正常听力的听众在条件下模拟人工耳蜗植入CIS和SPEAK类策略。评估了六种条件：3、4、8和16波段处理器（CIS类）、6/20波段处理器（SPEAK类）和未处理语音。正如预期的那样，在所有条件下，随着S/N水平的恶化，元音和辅音的识别分数下降。音素识别阈值（PRT）被定义为语音识别分数下降到安静时水平的50%时的信噪比。未经处理的语音具有最好的PRT，随着频带数量的减少而恶化。在三名Nucleus-22人工耳蜗使用者中，使用他们的正常SPEAK语音处理器或一个语音处理器进一步测量元音和辅音的识别。采用四通道CIS策略的定制处理器。最好的人工耳蜗用户在安静和噪音中使用CIS策略时，在收听相应的频谱退化语音时表现出与正常听力听众相似的性能。这些研究结果表明，人工耳蜗植入用户的噪声敏感性至少部分是由于频谱分辨率的损失。努力提高频谱信息通道的有效数量，应提高植入物在噪声中的性能。(C)1998年美国声学学会。[S0001-4966（98）05612-4]。
Current multichannel cochlear implant devices provide high levels of speech performance in quiet. However, performance deteriorates rapidly with increasing levels of background noise. The goal of this study was to investigate whether the noise susceptibility of cochlear implant users is primarily due to the loss of fine spectral information. Recognition of vowels and consonants was measured as a function of signal-to-noise ratio in four normal-hearing listeners in conditions simulating cochlear implants with both CIS and SPEAK-like strategies. Six conditions were evaluated: 3-, 4-, 8-, and 16-band processors (CIS-Like), a 6/20 band processor (SPEAK-like), and unprocessed speech. Recognition scores for vowels and consonants decreased as the S/N level worsened in all conditions, as expected. Phoneme recognition threshold (PRT) was defined as the S/N at which the recognition score fell to 50% of its level in quiet. The unprocessed speech had the best PRT, which worsened as the number of bands decreased. Recognition of vowels and consonants was further measured in three Nucleus-22 cochlear implant users using either their normal SPEAK speech processor or a. custom processor with a four-channel CIS strategy. The best cochlear implant user showed similar performance with the CIS strategy in quiet and in noise to that of normal-hearing listeners when listening to correspondingly spectrally degraded speech. These findings suggest that the noise susceptibility of cochlear implant users is at least partly due to the loss of spectral resolution. Efforts to improve the effective number of spectral information channels should improve implant performance in noise. (C) 1998 Acoustical Society of America. [S0001-4966(98)05612-4].