The role of perceived spatial separation in the unmasking of speech
The role of perceived spatial separation in the unmasking of speech
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DOI：
10.1121/1.428211
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发表时间：
1999-12-01
影响因子：
2.4
通讯作者：
Clifton, RK
中科院分区：
文献类型：
--
作者：
Freyman, RL;Helfer, KS;Clifton, RK
在无回声空间中，语音和噪声的空间分离创造了一种从掩蔽中释放出来的方式，这通常会提高语音的可理解性。然而，在混响空间中，掩蔽释放严重减少。这项研究调查了语音和干扰的不同和分开的局部化是否提供了任何由于优先效应而不被反射削弱的知觉优势。听者对女性说话者所说的无意义句子的识别是在存在语音频谱噪音或第二个女性说话者所说的其他句子的情况下进行的。在单声源和超前效应(超前-滞后)条件下，目标和干扰刺激被呈现在消声室中，来自正前方和右60度的扬声器。对于语音频谱噪声，语音识别的空间分离优势(8分贝)可以通过基于窄带刺激的掩蔽释放的清晰度指数计算来预测。在超前-滞后条件下，空间分离优势仅为1分贝，尽管优先效应产生了较大的知觉分离。对于女性说话者干扰，出现了更大的优势，这显然是因为目标和干扰的感知位置的差异减少了信息掩蔽。(C)1999年美国声学学会。[S0001-4966(99)01412-5]。
Spatial separation of speech and noise in an anechoic space creates a release from masking that often improves speech intelligibility. However, the masking release is severely reduced in reverberant spaces. This study investigated whether the distinct and separate localization of speech and interference provides any perceptual advantage that, due to the precedence effect, is not degraded by reflections. Listeners' identification of nonsense sentences spoken by a female talker was measured in the presence of either speech-spectrum noise or other sentences spoken by a second female talker. Target and interference stimuli were presented in an anechoic chamber from loudspeakers directly in front and 60 degrees to the right in single-source and precedence-effect (lead-lag) conditions. For speech-spectrum noise, the spatial separation advantage for speech recognition (8 dB) was predictable from articulation index computations based on measured release from masking for narrow-band stimuli. The spatial separation advantage was only 1 dB in the lead-lag condition, despite the fact that a large perceptual separation was produced by the precedence effect. For the female talker interference, a much larger advantage occurred, apparently because informational masking was reduced by differences in perceived locations of target and interference. (C) 1999 Acoustical Society of America. [S0001-4966(99)01412-5].