THRESHOLDS FOR HEARING MISTUNED PARTIALS AS SEPARATE TONES IN HARMONIC COMPLEXES
THRESHOLDS FOR HEARING MISTUNED PARTIALS AS SEPARATE TONES IN HARMONIC COMPLEXES
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DOI：
10.1121/1.394043
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发表时间：
1986-08-01
影响因子：
2.4
通讯作者：
PETERS, RW
中科院分区：
文献类型：
--
作者：
MOORE, BCJ;GLASBERG, BR;PETERS, RW
当谐波复音中的低谐波与它的谐波值失谐到足够的程度时，它就会被当作一个单独的音调来听，从整个复音中脱颖而出。该实验估计了这种现象发生所需的失谐程度，对于具有10或12个等振幅分量（每个分量60 dB SPL）的复杂音调。在每次试验中，受试者都要面对一个复杂的音调，这个音调要么所有的偏音都在谐波频率上，要么有一个偏音偏离了谐波频率。受试者必须指出，他听到的是一个单一音调的复音，还是一个复音加上一个不“属于”复音的纯音。采用自适应程序跟踪实现d”值为1所需的失谐程度。对每个复音的前六个谐波分别确定阈值。在一组条件下，刺激持续时间为410 ms，基频为100、200或400 Hz。在大多数情况下，阈值在谐波频率的1%到3%之间，这取决于主题。然而，100赫兹基本频率的前两个谐波的阈值往往更大，对一些受试者来说，第五和第六次谐波的阈值更高。在第二组条件下，基频保持在200hz不变，持续时间为50、110、410或1610毫秒。当持续时间从1610 ms减少到50 ms时，阈值增加了3-5倍。结果讨论了一个假设的谐波筛子和机制的感性流的形成。
When a low harmonic in a harmonic complex tone is mistuned from its harmonic value by a sufficient amount it is heard as a separate tone, standing out from the complex as a whole. This experiment estimated the degree of mistuning required for this phenomenon to occur, for complex tones with 10 or 12 equal-amplitude components (60 dB SPL per component). On each trial the subject was presented with a complex tone which either had all its partials at harmonic frequencies or had one partial mistuned from its harmonic frequency. The subject had to indicate whether he heard a single complex tone with one pitch or a complex tone plus a pure tone which did not "belong" to the complex. An adaptive procedure was used to track the degree of mistuning required to achieve a d'' value of 1. Threshold was determined for each of the first six harmonics of each complex tone. In one set of conditions stimulus duration was held constant 410 ms, and the fundamental frequency was either 100, 200, or 400 Hz. For most conditions the thresholds fell between 1% and 3% of the harmonic frequency, depending on the subject. however, thresholds tended to be greater for the first two harmonics of the 100-Hz fundamental and, for some subjects, thresholds increased for the fifth and sixth harmonics. In a second set of conditions fundamental frequency was held constant at 200 Hz, and the duration was either 50, 110, 410, or 1610 ms. Thresholds increased by a factor of 3-5 as duration was decreased from 1610 ms to 50 ms. The results are discussed in terms of a hypothetical harmonic sieve and mechanisms for the formation of perceptual streams.