Effects of Masker Envelope Fluctuations on the Temporal Effect.

Effects of Masker Envelope Fluctuations on the Temporal Effect.
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掩蔽包络波动对时间效应的影响。

DOI:
10.1007/s10162-018-00688-x
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发表时间:
2018
期刊:
Journal of the Association for Research in Otolaryngology : JARO
影响因子:
--
通讯作者:
Stone,Caitlin
Stone,Caitlin
中科院分区:
--
文献类型:
--
作者:
Jennings,SkylerG;Sivas,Kayla;Stone,Caitlin

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在一定条件下,当短正弦探头的起始时间比长正弦探头的起始时间延迟时,同时屏蔽的检测阈值得到提高。这种改进被称为时间效应,在宽带掩模中效果最大,而在以探测频率为中心的窄带掩模中效果较小或不存在。本研究验证了窄带掩模时间效应小或不存在的假设是由于高斯噪声固有的时间包络波动。窄带噪声掩蔽器具有波动(“波动掩蔽器”)和平坦(“平坦掩蔽器”)的时间包络,作为掩蔽器水平(Exp. I)和存在波动和平坦前体(Exp. II)的函数,测量了其时间效应。波动型窄带掩模的时间效应不存在,扁平型窄带掩模的时间效应可达~ 7 dB。前驱体和掩蔽物的时间包络的交流耦合功率占波动和扁平前驱体和掩蔽物测量的探针检测阈值方差的94%。这些结果表明,掩蔽时间包络波动有助于时间效应,应在未来的建模工作中加以考虑。
Under certain conditions, detection thresholds in simultaneous masking improve when the onset of a short sinusoidal probe is delayed from the onset of a long masker. This improvement, known as the temporal effect, is largest for broadband maskers and is smaller or absent for narrowband maskers centered on the probe frequency. This study tests the hypothesis that small or absent temporal effects for narrowband maskers are due to the inherent temporal envelope fluctuations of Gaussian noise. Temporal effects were measured for narrowband noise maskers with fluctuating (“fluctuating maskers”) and flattened (“flattened maskers”) temporal envelopes as a function of masker level (Exp. I) and in the presence of fluctuating and flattened precursors (Exp. II). The temporal effect was absent for fluctuating narrowband maskers and as large as ~ 7 dB for flattened narrowband maskers. The AC-coupled power of the temporal envelopes of precursors and maskers accounted for 94 % of the variance in probe detection thresholds measured with fluctuating and flattened precursors and maskers. These results suggest that masker temporal envelope fluctuations contribute to the temporal effect and should be considered in future modeling efforts.
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