Spatial unmasking of birdsong in human listeners: Energetic and informational factors
Spatial unmasking of birdsong in human listeners: Energetic and informational factors
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DOI：
10.1121/1.2130949
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发表时间：
2005-12-01
影响因子：
2.4
通讯作者：
Shinn-Cunningham, BG
中科院分区：
文献类型：
--
作者：
Best, V;Ozmeral, E;Shinn-Cunningham, BG
空间去掩蔽描述了通过在空间上将目标声音从同时掩蔽的声音中分离出来而对目标声音的检测或识别的改进。在存在干扰声音的情况下，这种效应已被广泛研究用于语音可理解性。在目前的研究中，听者识别了斑胸草雀的歌声，它与语音有许多相同的声学特性，但缺乏语义和语言内容。使用了三种长期频谱内容相同但短期统计数据不同的掩蔽器：(1)合唱（不熟悉的斑胸草雀歌曲的组合），(2)歌形噪声（合唱平均频谱的宽带噪声）和(3)合唱调制噪声（歌曲形噪声乘以合唱掩蔽器的宽带包络）。掩蔽和空间揭露的数量取决于掩蔽者，并且有证据表明从能量掩蔽和信息掩蔽中释放。在统计上相似的合唱面具中，空间揭露效果最好。对于两种噪声掩蔽器，空间暴露较少，并且完全由声学较好的耳朵的相对目标和掩蔽器水平所解释。该结果与使用语音目标的类似结果有许多相同的特征，表明空间分离有助于通过非特定于语音的机制分离复杂的自然声音。(c) 2005年美国声学学会。
Spatial unmasking describes the improvement in the detection or identification of a target sound afforded by separating it spatially from simultaneous masking sounds. This effect has been studied extensively for speech intelligibility in the presence of interfering sounds. In the current study, listeners identified zebra finch song, which shares many acoustic properties with speech but lacks semantic and linguistic content. Three maskers with the same long-term spectral content but different short-term statistics were used: (1) chorus (combinations of unfamiliar zebra finch songs), (2) song-shaped noise (broadband noise with the average spectrum of chorus), and (3) chorus-modulated noise (song-shaped noise multiplied by the broadband envelope from a chorus masker). The amount of masking and spatial unmasking depended on the masker and there was evidence of release from both energetic and informational masking. Spatial unmasking was greatest for the statistically similar chorus masker. For the two noise maskers, there was less spatial unmasking and it was wholly accounted for by the relative target and masker levels at the acoustically better ear. The results share many features with analogous results using speech targets, suggesting that spatial separation aids in the segregation of complex natural sounds through mechanisms that are not specific to speech. (c) 2005 Acoustical Society of America.