Masking produced by broadband noise presented in virtual auditory space
Masking produced by broadband noise presented in virtual auditory space
复制标题
DOI：
10.1121/1.417236
复制
发表时间：
1996-12-01
影响因子：
2.4
通讯作者：
Wardman, D
中科院分区：
文献类型：
--
作者：
Carlile, S;Wardman, D
已经尝试将在二分听条件下研究的掩蔽效应与在自由场中看到的掩蔽联系起来。使用了虚拟听觉空间(VAS)中呈现的宽带掩蔽器，而不是使用结合单耳和双耳收听条件的自由场掩蔽范例。测试了两个虚拟位置：一个是右耳间轴线(距前中线+90度)，另一个是前中线右40度。通过对测试频率进行带通滤波，VAS掩模还得到了窄带(临界带宽)二分掩模和双折射掩模。这一过程保留了临界频带内关于测试频率的耳间差异，但删除了临界频带之外的信息。使用以0.6 kHz为中心的窄带掩蔽器，使用0.6 khz的双耳目标音，与单只耳朵相比，在两耳分离条件下的信号检测增加。此外，当使用宽带VAS掩蔽器时，在该目标频率下的信号检测没有进一步的优势。这表明，对于低频目标，在目标频率的临界频带内的双耳差异足以有效地揭开掩蔽。相反，对于4 khz的目标频率，二分窄带掩蔽器导致的检测结果比任何一只耳朵的都要少。然而，当使用宽带VAS掩蔽器时，检测能力提高到可归因于远耳的水平。这表明，临界频段以外的信息参与了高频目标的揭开。(C)1996年美国声学学会。
An attempt has been made to relate the masking effects studied under dichotic listening conditions to masking seen in the free field. Rather than use a free-field masking paradigm combined with monaural and binaural listening conditions, broadband maskers presented in virtual auditory space (VAS) have been used. Two virtual locations were tested: One was the right interaural axis (+90 degrees from the anterior midline) and the other was 40 degrees right of the anterior midline. Narrow-band (critical bandwidth) dichotic and diotic maskers were also derived from the VAS masker by bandpass filtering around the test frequency. This procedure preserved the interaural differences within the critical band about the test frequency but removed information outside the critical band. Using a diotic target tone of 0.6 kHz with a narrow-band masker centered on 0.6 kHz there was an increase in signal detection in the dichotic conditions when compared to that attributable to either ear alone. Furthermore, there was no further advantage in signal detection at this target frequency when a broadband VAS masker was used. This suggests that for low-frequency targets, the binaural differences within the critical band about the target frequency are sufficient for effective unmasking. In contrast, for a target frequency of 4 kHz, a dichotic narrow-band masker resulted in a reduction in detection compared to that attributable to either ear. However, detection improved to the level attributable to the far ear when a broadband VAS masker was used. This suggests that information outside the critical band is involved in the unmasking of high-frequency targets. (C) 1996 Acoustical Society of America.