Binaural notched-noise masking and auditory-filter shape.

Binaural notched-noise masking and auditory-filter shape.
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双耳陷波噪声掩蔽和听觉滤波器形状。

DOI:
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发表时间:
2013
影响因子:
2.4
通讯作者:
J. Verhey
J. Verhey
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
M. Nitschmann;J. Verhey

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在双耳陷波噪声掩蔽器(N0)存在的情况下,测量了作为陷波宽度的函数的耳间同相(S0)和反相(Sπ)的正弦信号的持续时间。信号频率为250、500、1000或2000 Hz。对于所有信号频率,随着陷波宽度的增加,N0S 0和N0Sπ阈值之间的差(双耳掩蔽水平差,BMLD)不断减小。模型模拟表明,这一结果不能占一个模型,只处理的听觉滤波器的输出集中在信号频率,即使考虑滤波器形状的单耳频率选择性或耳间差异的非线性行为。如果包括有害的跨通道过程,则通过将相邻滤波器的输出的部分添加到频率上滤波器的输出,或者通过双耳阶段中的耳间相位中的陷波宽度相关的不利移位,数据被很好地预测。这种有害的跨信道过程的强度往往随着信号频率的增加而减小。
Thresholds for sinusoids interaurally in phase (S0) and antiphase (Sπ) were measured in the presence of a diotic notched-noise masker (N0) as a function of notch width. The signal frequency was 250, 500, 1000, or 2000 Hz. For all signal frequencies, the difference between N0S0 and N0Sπ thresholds (binaural masking-level difference, BMLD) decreased continuously as the notch width increased. Model simulations showed that this result cannot be accounted for by a model that only processes the output of the auditory filter centered at the signal frequency, even if the nonlinear behavior of the monaural frequency selectivity or interaural differences in the filter shape are considered. The data were predicted well if a detrimental across-channel process was included, either by an addition of portions of the output of adjacent filters to the output of the on-frequency filter or by a notch-width dependent adverse shift in interaural phase in the binaural stage. The strength of this detrimental across-channel process tends to decrease with increasing signal frequencies.
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