Department für Medizinische Physik und Akustik, Universität Oldenburg, 26111 Oldenburg, Germany.
J Acoust Soc Am. 2022 Jun;151(6):3927. doi: 10.1121/10.0011673.
Differences in interaural phase configuration between a target and a masker can lead to substantial binaural unmasking. This effect is decreased for masking noises with an interaural time difference (ITD). Adding a second noise with an opposing ITD in most cases further reduces binaural unmasking. Thus far, modeling of these detection thresholds required both a mechanism for internal ITD compensation and an increased filter bandwidth. An alternative explanation for the reduction is that unmasking is impaired by the lower interaural coherence in off-frequency regions caused by the second masker [Marquardt and McAlpine (2009). J. Acoust. Soc. Am. 126(6), EL177-EL182]. Based on this hypothesis, the current work proposes a quantitative multi-channel model using monaurally derived peripheral filter bandwidths and an across-channel incoherence interference mechanism. This mechanism differs from wider filters since it has no effect when the masker coherence is constant across frequency bands. Combined with a monaural energy discrimination pathway, the model predicts the differences between a single delayed noise and two opposingly delayed noises as well as four other data sets. It helps resolve the inconsistency that simulating some data requires wide filters while others require narrow filters.
目标和掩蔽声之间的耳间相位配置差异会导致显著的双耳掩蔽。对于具有耳间时间差 (ITD) 的掩蔽噪声，这种效果会降低。在大多数情况下，添加具有相反 ITD 的第二个噪声会进一步降低双耳掩蔽。到目前为止，这些检测阈值的建模既需要内部 ITD 补偿机制，又需要增加滤波器带宽。另一种解释是，由于第二个掩蔽器在离频区域中较低的耳间相干性，掩蔽受到损害 [Marquardt 和 McAlpine (2009)。J. Acoust. Soc. Am. 126(6)，EL177-EL182]。基于这一假设，当前的工作提出了一种使用单耳推导的外围滤波器带宽和跨通道不连贯性干扰机制的定量多通道模型。该机制与较宽的滤波器不同，因为当掩蔽相干性在频带之间保持恒定时，它没有影响。与单耳能量判别途径相结合，该模型预测了单个延迟噪声与两个相反延迟噪声以及其他四个数据集之间的差异。它有助于解决模拟某些数据需要宽滤波器而其他数据需要窄滤波器的不一致性。
