A new approach to comparing binaural masking level differences at low and high frequencies
A new approach to comparing binaural masking level differences at low and high frequencies
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DOI：
10.1121/1.418151
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发表时间：
1997-03-01
影响因子：
2.4
通讯作者：
Kohlrausch, A
中科院分区：
文献类型：
--
作者：
vandePar, S;Kohlrausch, A
介绍了一种研究高频下双耳处理的新实验技术。在125、250和4000赫兹的窄带噪声中，测量了条件N0Spi和NpiS0的双耳掩蔽电平差(BMLD)。此外，还产生了以4000赫兹为中心的“转置”刺激，但被设计成在包络内保留在两个较低频率可用的时间“精细结构”信息。用125赫兹转置刺激测量的BMLD与常规125赫兹条件下的BMLD基本相同。转置的250赫兹刺激产生的BMLD通常比中心250赫兹的刺激产生的BMLD更小，但作为掩蔽器带宽函数的结果模式是相同的。转置刺激的结果模式不同于4000赫兹条件下的结果，并且与低频掩蔽数据一致，通常显示出更高的BMLD。结果表明，低频和高频下双耳加工的机制是相似的，BMLD的频率相关差异可能反映了听觉系统无法编码高频刺激的时间精细结构。(C)1997年美国声学学会。
A new experimental technique for studying binaural processing at high frequencies is introduced. Binaural masking level differences (BMLDs) for the conditions N0Spi and NpiS0 were measured for a tonal signal in narrow-band noise at 125, 250, and 4000 Hz. In addition, ''transposed'' stimuli were generated, which were centered at 4000 Hz, but were designed to preserve within the envelope the temporal ''fine-structure'' information available at the two lower frequencies. The BMLDs measured with the 125-Hz transposed stimuli were essentially the same as BMLDs from the regular 125-Hz condition. The transposed 250-Hz stimuli generally produced smaller BMLDs than the stimuli centered at 250 Hz, but the pattern of results as a function of masker bandwidth was the same. The patterns of results from the transposed stimuli are different from those of the 4000-Hz condition and, consistent with the low-frequency masker data, generally show higher BMLDs. The results indicate that the mechanisms underlying binaural processing at low and high frequencies are similar, and that frequency-dependent differences in BMLDs probably reflect the inability of the auditory system to encode the temporal fine structure of high-frequency stimuli. (C) 1997 Acoustical Society of America.