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Signal processing of acoustic signals in the time domain with an active nonlinear nonlocal cochlear model

机译：有源非线性非局部耳蜗模型在时域中对声信号的信号处理

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摘要

A two-space dimensional active nonlinear nonlocal cochlear model is formulated in the time domain to capture nonlinear hearing effects such as compression, multi-tone suppression and difference tones. The micromechanics of the basilar membrane (BM) are incorporated to model active cochlear properties. An active gain parameter is constructed in the form of a nonlinear nonlocal functional of BM displacement. The model is discretized with a boundary integral method and numerically solved using an iterative second-order accurate finite difference scheme. A block matrix structure of the discrete system is exploited to simplify the numerics with no loss of accuracy. Model responses to multiple frequency stimuli are shown in agreement with hearing experiments. A nonlinear spectrum is computed from the model, and compared with FFT spectrum for noisy tonal inputs. The discretized model is efficient and accurate, and can serve as a useful auditory signal processing tool. (C) 2005 Elsevier B.V. All rights reserved.
机译：在时域中建立了二维主动非线性非本地人工耳蜗模型，以捕获非线性听力效应，例如压缩，多音抑制和差异音。基底膜（BM）的微力学被纳入模型来模拟主动耳蜗特性。主动增益参数以BM位移的非线性非局部函数形式构建。使用边界积分法离散化模型，并使用迭代二阶精确有限差分方案进行数值求解。利用离散系统的块矩阵结构来简化数字，而不会损失精度。与听力实验一致显示了对多种频率刺激的模型响应。从模型中计算出一个非线性频谱，并将其与FFT频谱进行比较，以获取嘈杂的音调输入。离散模型是有效且准确的，并且可以用作有用的听觉信号处理工具。 （C）2005 Elsevier B.V.保留所有权利。

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