Clear speech perception in acoustic and electric hearing
Clear speech perception in acoustic and electric hearing
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DOI：
10.1121/1.1787528
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发表时间：
2004-10-01
影响因子：
2.4
通讯作者：
Zeng, FG
中科院分区：
文献类型：
--
作者：
Liu, S;Del Rio, E;Zeng, FG
当被指示为听力损失者清晰说话时，说话者可以通过发出“清晰”的语音来有效地提高其语音的清晰度。我们分析了两名说话者的清晰对话语音的整体声学特性，并在声学和电学听力的各种信噪比下测量了他们的语音清晰度。与之前的研究一致，我们发现清晰语音的总体速率较慢，时间幅度调制较高，并且比会话语音产生更高的清晰度。为了描述时间幅度调制在清晰语音中的作用，我们从多个频带中提取时间包络，并用噪声精细结构代替语音精细结构来模拟人工耳蜗。尽管模拟和实际的人工耳蜗聆听者都需要更高的信噪比才能实现正常性能，但在所有实验条件下，清晰语音和对话语音之间的语音接收阈值仍保留 3-4 dB 的差异。这些结果表明，虽然时间精细结构对于一般噪声中的语音识别很重要，但时间包络携带的声学线索有助于清晰的语音清晰度优势。 (C) 2004 年美国声学学会。
When instructed to speak clearly for people with hearing loss, a talker can effectively enhance the intelligibility of his/her speech by producing "clear" speech. We analyzed global acoustic properties of clear and conversational speech from two talkers and measured their speech intelligibility over a wide range of signal-to-noise ratios in acoustic and electric hearing. Consistent with previous studies, we, found that clear speech had a slower overall rate, higher temporal amplitude modulations, and also produced higher intelligibility than conversational speech. To delineate the role of temporal amplitude modulations in clear speech, we extracted the temporal envelope from a number of frequency bands and replaced speech fine-structure with noise fine-structure to simulate cochlear implants. Although both simulated and actual cochlear-implant listeners required higher signal-to-noise ratios to achieve normal performance, a 3-4 dB difference in speech reception threshold was preserved between clear and conversational speech for all experimental conditions. These results suggest that while temporal fine structure is important for speech recognition in noise in general, the temporal envelope carries acoustic cues that contribute to the clear speech intelligibility advantage. (C) 2004 Acoustical Society of America.