Effects of differences in the pattern of amplitude envelopes across harmonics on auditory stream segregation
Effects of differences in the pattern of amplitude envelopes across harmonics on auditory stream segregation
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DOI：
10.1016/j.heares.2004.03.009
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发表时间：
2004-07-01
期刊：
影响因子：
2.8
通讯作者：
Roberts, B
中科院分区：
文献类型：
--
作者：
Cusack, R;Roberts, B
当来自许多来源的声音混合到达耳朵时，听觉系统试图将其分离成不同的感知流。对于声音序列，基本声学特性（例如，频率分离、速率）对流式传输的影响是很好理解的，但是对于更复杂的声学属性的影响知之甚少。众所周知，频谱的动态变化对声音的音色有重要影响。我们调查了动态变化是否也影响流分离。使用周期性音调，包括谐波1-6，并以长序列（ABA-ABA-.）呈现。音调A和B的基频总是不同的，这是一个已知的影响流的因素，并且具有相同或不同的频谱变化模式。总变化量（光谱通量）保持恒定。听众每时每刻都在判断这些序列的分组，所用的衡量标准是一个序列被听到的时间比例。我们发现，序列的复杂的音调与不同模式的频谱变化更容易分离时，这会导致不同的模式的变化，在频率中心随时间的推移（实验1和2），但不是当它不（实验3）。(C)2004年由Elsevier B. V.出版
When a mixture of sound from many sources arrives at the ear, the auditory system attempts to segregate it into different perceptual streams. For sequences of sounds, the effects of basic acoustic properties (e.g., frequency separation, rate) on streaming are well understood, but much less is known about the effects of more complex acoustic attributes. Dynamic variations in frequency spectrum are known to have an important effect on the timbre of sounds. We investigated whether dynamic variations also affect stream segregation. Periodic tones were used, comprising harmonics 1-6, and presented in long sequences (ABA-ABA-...). Tones A and B always differed in fundamental frequency, a factor known to influence streaming, and had either the same or different patterns of spectral variation. The total amount of variation (spectral flux) was held constant. Listeners judged moment-by-moment the grouping of these sequences, and the measure used was the proportion of time a sequence was heard as segregated. We found that sequences of complex tones with different patterns of spectral variation are more likely to segregate when this results in different patterns of change in the frequency centroid over time (Experiments 1 and 2), but not when it does not (Experiment 3). (C) 2004 Published by Elsevier B.V.