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Superposition of masking releases

机译：掩盖释放的叠加

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摘要

We are constantly exposed to a mixture of sounds of which only few are important to consider. In order to improve detectability and to segregate important sounds from less important sounds, the auditory system uses different aspects of natural sound sources. Among these are (a) its specific location and (b) synchronous envelope fluctuations in different frequency regions. Such a comodulation of different frequency bands facilitates the detection of tones in noise, a phenomenon known as comodulation masking release (CMR). Physiological as well as psychoacoustical studies usually investigate only one of these strategies to segregate sounds. Here we present psychoacoustical data on CMR for various virtual locations of the signal by varying its interaural phase difference (IPD). The results indicate that the masking release in conditions with binaural (interaural phase differences) and across-frequency (synchronous envelope fluctuations, i.e. comodulation) cues present is equal to the sum of the masking releases for each of the cues separately. Data and model predictions with a simplified model of the auditory system indicate an independent and serial processing of binaural cues and monaural across-frequency cues, maximizing the benefits from the envelope comparison across frequency and the comparison of fine structure across ears.
机译：我们经常接触到各种声音，其中只有少数几个重要的考虑因素。为了提高可检测性并将重要声音与次要声音分开，听觉系统使用自然声源的不同方面。其中（a）它的特定位置和（b）不同频率区域中的同步包络波动。不同频带的这种共调制有助于检测噪声中的音调，这种现象称为共调制掩蔽释放（CMR）。生理学和心理声学研究通常只研究其中一种分离声音的策略。在这里，我们通过改变其耳间相位差（IPD）来显示CMR上各种虚拟位置的心理声学数据。结果表明，在具有双耳（耳间相位差）和跨频（同步包络起伏，即共调制）提示的情况下，掩蔽释放等于每个提示各自的掩蔽释放总和。带有简化听觉系统模型的数据和模型预测表明，双耳线索和单耳跨频线索是独立和串行处理的，从而最大程度地受益于跨频包络比较和跨耳精细结构比较。

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