Applications of Nonlinear Dynamics
Applications of Nonlinear Dynamics
复制标题
非线性动力学的应用
DOI：
10.1007/978-3-540-85632-0_19
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
Stocks N
中科院分区：
文献类型：
--
作者：
Stocks N
人工耳蜗是一种修复装置，用来为那些本来会严重失聪的人提供听力。在电极信号中故意添加噪声原则上可以通过称为超阈值随机共振（SSR）的效应增加信息的传输量。然而，要使SSR发生，必须以这样一种方式添加噪声，以便在神经纤维群中实现至少部分独立的随机活动。我们正在研究随机波束形成的使用，以获得更大的独立性。该策略包括用独立高斯噪声源的线性组合呈现每个电极。由于耳蜗中充满了导电盐溶液，来自电极的噪声电流相互作用，因此对每条神经纤维的有效刺激将是噪声源的不同加权和。我们证明了每个电极有可能得到一个独立的激励点。此外，我们首次报道了随机波束形成导致在人工耳蜗中观察到SSR。
Cochlear implants are prosthetic devices used to provide hearing to people who would otherwise be profoundly deaf. The deliberate addition of noise to the electrode signals can in principle increase the amount of information transmitted via an effect termed suprathreshold stochastic resonance (SSR). However, for SSR to occur the noise must be added in such a way so as to achieve, at least partial, independent stochastic activity across the nerve fibre population.We are investigating the use of stochastic beamforming to achieve greater independence. The strategy involves presenting each electrode with a linear combination of independent Gaussian noise sources. Because the cochlea is filled with conductive salt solutions, the noise currents from the electrodes interact and the effective stimulus for each nerve fibre will therefore be a different weighted sum of the noise sources. We show that it is possible to get one independent point of excitation for each electrode. Also, we report for the first time, that stochastic beamforming lead to the observation of SSR in a cochlear implant.