Differential contribution of envelope fluctuations across frequency to consonant identification in quiet
Differential contribution of envelope fluctuations across frequency to consonant identification in quiet
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DOI：
10.1121/1.2897916
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发表时间：
2008-05-01
影响因子：
2.4
通讯作者：
Bacon, Sid P.
中科院分区：
文献类型：
--
作者：
Apoux, Frederic;Bacon, Sid P.
两个实验研究了临界带宽和频率区域对语音使用时间包络线索的影响。在这两个实验中，频谱细节减少使用声码器处理。在实验1中，辅音识别分数测量的条件下，其中的包络提取器的截止频率的一半的临界带宽（HCB）的听觉滤波器集中在每个分析频带。结果表明，性能类似于在包络截止设置为160 Hz或以上的条件下获得的性能。实验2评估了将包络提取器的截止频率设置为4、8和16 Hz的值或八频带声码器的一个或两个相邻频带中的HCB的影响。对于所有其他频带，截止频率设置为16 Hz。总的来说，辅音识别不受影响，消除包络波动超过4赫兹的低，高频段。与此相反，语音清晰度下降的截止频率降低，在中频区域从16至4赫兹。行为的结果是相当一致的物理分析的刺激，这表明，明确可测量的包络波动不能衰减而不影响语音清晰度。(c)2008年，美国声学学会。
Two experiments investigated the effects of critical bandwidth and frequency region on the use of temporal envelope cues for speech. In both experiments, spectral details were reduced using vocoder processing. In experiment 1, consonant identification scores were measured in a condition for which the cutoff frequency of the envelope extractor was half the critical bandwidth (HCB) of the auditory filters centered on each analysis band. Results showed that performance is similar to those obtained in conditions for which the envelope cutoff was set to 160 Hz or above. Experiment 2 evaluated the impact of setting the cutoff frequency of the envelope extractor to values, of 4, 8, and 16 Hz or to HCB in one or two contiguous bands for an eight-band vocoder. The cutoff was set to 16 Hz for all the other bands. Overall, consonant identification was not affected by removing envelope fluctuations above 4 Hz in the low- and high-frequency bands. In contrast, speech intelligibility decreased as the cutoff frequency was decreased in the midfrequency region from 16 to 4 Hz. The behavioral results were fairly consistent with a physical analysis of the stimuli, suggesting that clearly measurable envelope fluctuations cannot be attenuated without affecting speech intelligibility. (c) 2008 Acoustical Society of America.