Temporal properties in clear speech perception.
Temporal properties in clear speech perception.
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DOI：
10.1121/1.2208427
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发表时间：
2006-06
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影响因子：
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通讯作者：
Sheng Liu;F. Zeng
中科院分区：
文献类型：
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作者：
Sheng Liu;F. Zeng
进行了三个实验来研究语速、时间包络和时间精细结构对清晰语音感知的相对贡献。实验我使用统一的时间缩放来匹配清晰语音和会话语音之间的语速。实验二通过增加语音片段之间的无声间隙，在不处理伪影的情况下降低了会话语音的语速。实验三通过将清晰语音的时间包络与会话语音的精细结构混合起来创造了“听觉嵌合体”，反之亦然。在广泛的信噪比范围内测量正常听力听众的语音清晰度，以得出语音接收阈值 (SRT)。结果表明，统一时间缩放中的处理伪影（尤其是时间压缩）会降低语音清晰度。在会话语音中插入间隙可将 SRT 提高 1.3 dB，但这种改进可能是电平归一化过程中短期信噪比增加的结果。来自听觉嵌合体的数据表明，在高信噪比下，时间包络线索对清晰语音优势的贡献更大，而时间精细结构线索在低信噪比下的贡献更大。总而言之，这些结果表明，清晰语音优势的声学线索是多重且分布的。
Three experiments were conducted to study relative contributions of speaking rate, temporal envelope, and temporal fine structure to clear speech perception. Experiment I used uniform time scaling to match the speaking rate between clear and conversational speech. Experiment II decreased the speaking rate in conversational speech without processing artifacts by increasing silent gaps between phonetic segments. Experiment III created "auditory chimeras" by mixing the temporal envelope of clear speech with the fine structure of conversational speech, and vice versa. Speech intelligibility in normal-hearing listeners was measured over a wide range of signal-to-noise ratios to derive speech reception thresholds (SRT). The results showed that processing artifacts in uniform time scaling, particularly time compression, reduced speech intelligibility. Inserting gaps in conversational speech improved the SRT by 1.3 dB, but this improvement might be a result of increased short-term signal-to-noise ratios during level normalization. Data from auditory chimeras indicated that the temporal envelope cue contributed more to the clear speech advantage at high signal-to-noise ratios, whereas the temporal fine structure cue contributed more at low signal-to-noise ratios. Taken together, these results suggest that acoustic cues for the clear speech advantage are multiple and distributed.