Spatial release from energetic and informational masking in a divided speech identification task
Spatial release from energetic and informational masking in a divided speech identification task
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DOI：
10.1121/1.2904825
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发表时间：
2008-06-01
影响因子：
2.4
通讯作者：
Shinn-Cunningham, Barbara
中科院分区：
文献类型：
--
作者：
Ihlefeld, Antje;Shinn-Cunningham, Barbara
当在两个说话者的环境中有选择地听一个说话者时，性能通常会随着源的空间分离而提高。目前的研究探讨了空间分离在分裂聆听中的作用，当听众报告两个同时处理的信息几乎没有频谱重叠（限制了信息之间的“能量掩蔽”）。一条消息以固定级别呈现，而另一条消息的级别从等于到比固定级别消息小40 dB不等。结果表明，竞争信息的空间分离提高了分听性能。大多数错误的发生是因为听者没有报告不那么紧张的谈话者的内容。此外，随着变电平对讲机与固定电平对讲机的宽带能量比的增加，性能普遍提高。错误模式表明，空间分离通过提高以下能力来提高低强度说话者的可理解性：(1)听到本来会被掩盖的部分信号；(2)将两个说话者适当地分离成单独的感知流；(3)选择性地将注意力集中在低强度说话者身上。空间布局并没有显著影响报告更激烈的谈话者的能力，这表明它的处理方式与积极参与的不那么激烈的谈话者不同。(C) 2008美国声学学会。
When listening selectively to one talker in a two-talker environment, performance generally improves with spatial separation of the sources. The current study explores the role of spatial separation in divided listening, when listeners reported both of two simultaneous messages processed to have little spectral overlap (limiting "energetic masking" between the messages). One message was presented at a fixed level, while the other message level varied from equal to 40 dB less than that of the fixed-level message. Results demonstrate that spatial separation of the competing messages improved divided-listening performance. Most errors occurred because listeners failed to report the content of the less-intense talker. Moreover, performance generally improved as the broadband energy ratio of the variable-level to the fixed-level talker increased. The error patterns suggest that spatial separation improves the intelligibility of the less-intense talker by improving the ability to (1) hear portions of the signal that would otherwise be masked, (2) segregate the two talkers properly into separate perceptual streams, and (3) selectively focus attention on the less-intense talker. Spatial configuration did not noticeably affect the ability to report the more-intense talker, suggesting that it was processed differently than the less-intense talker, which was actively attended. (C) 2008 Acoustical Society of America.