Frequency discrimination of complex tones; assessing the role of component resolvability and temporal fine structure
Frequency discrimination of complex tones; assessing the role of component resolvability and temporal fine structure
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DOI：
10.1121/1.2139070
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发表时间：
2006-01-01
影响因子：
2.4
通讯作者：
Flanagan, HJ
中科院分区：
文献类型：
--
作者：
Moore, BCJ;Glasberg, BR;Flanagan, HJ
反对歧视。当存在低谐波时，复音调的基频（170）F0 DL小，但当最低谐波的数目N大于8时，基频增加。为了评估范围8-10中的N的相对小的FODL是基于（部分地）分辨的谐波还是基于时间精细结构信息，针对具有以余弦或交替相位添加的三个连续谐波的音调，测量FODL作为N的函数。中心频率为2000 Hz，通过改变平均F0来改变N。背景噪声被用来掩盖组合音。F0值在试验间进行了比较，以迫使受试者进行试验内比较。对于每一个刺激，N都以+/-1来表示，以防止受试者使用兴奋模式线索。当N=6或7时，F0 DLs不受分量相位的影响，但当N超过7时，余弦相位的F0 DLs比交替相位的F0 DLs小，这表明时间精细结构在此范围内起作用。当中心频率增加到5000 Hz时，对于低N，性能差得多，这表明锁相对于获得具有分辨谐波的低F0 DL是重要的。(c)2006年，美国声学学会。
Thresholds for discriminating. the fundamental frequency (170) of a complex tone, F0DLs, are small when low harmonics are present, but increase when the number of the lowest harmonic, N, is above eight. To assess whether the relatively small F0DLs for N in the range 8-10 are based on (partly) resolved harmonics or on temporal fine structure information, F0DLs were measured as a function of N for tones with three successive harmonics which were added either in cosine or alternating phase. The center frequency was 2000 Hz, and N was varied by changing the mean F0. A background noise was used to mask combination tones. The value of F0 was roved across trials to force subjects to make within-trial comparisons. N was roved by +/- 1 for every stimulus, to prevent subjects from using excitation pattern cues. F0DLs were not influenced by component phase for N=6 or 7, but were smaller for cosine than for alternating phase once N exceeded 7, suggesting that temporal fine structure plays a role in this range. When the center frequency was increased to 5000 Hz, performance was much worse for low N, suggesting that phase locking is important for obtaining low F0DLs with resolved harmonics. (c) 2006 Acoustical Society of America.