项目名称: 耳蜗信号处理新特征与机理
项目编号: No.90820001
项目类型: 专项基金项目
立项/批准年度: 2009
项目学科: 金属学与金属工艺
项目作者: 龙长才
作者单位: 华中科技大学
项目金额: 50万元
中文摘要: 耳蜗是听觉系统的重要部分,借鉴其信号处理功能是听力康复、基于听觉的语音信号处理的关键环节。现有听觉理论认为,耳蜗有类似付氏分析或小波分析的频率分析功能,基于听觉的计算通常用Gamma tone (作为冲击响应)线性模型模拟耳蜗的信号处理,以此构建的系统并无传统信号处理方法所不具备的独特信号处理功能,性能也无实质性改善。本研究通过非线性物理理论与实验研究,揭示耳蜗所具有的,能够反映某些独特听觉功能的耳蜗非线性信号处理特征与机理,提供具有独特信号处理功能的耳蜗信号处理模型。 研究在如下四个方面取得进展:1〉建立了基于耳蜗主动机制的非线性动力学模型,模型能够反映听觉的非线性动态压缩等非线性听觉特征;2〉发展了具有比纳米尺度更小分辨的、无频率失真的微振动测量技术和相应的耳蜗振动动力学激光测量分析系统;3〉采用上述测量系统的初步实验证实了耳蜗具有所构建动力学模型的动力学特征;4〉建立了基于上述非线性动力学模型的耳蜗信号处理阵列模型,模型展示了抗噪声、语音特征增强功能。
中文关键词: 耳蜗;信号处理;非线性动力学
英文摘要: Cochlea is important stage of auditory system, and its signal processing function is critical in auditory prosthetics and auditory based speech processing. Gamma tone (as impulse response) linear model is usually adopted in auditory based computation to mimic cochlear signal processing. but systems abased on linear cochlea model don't perform unique signal procesing function. This project have tried to explore the nonlinear signal proceesing function of cochlea in theory and experiment, and establish cochlear model with unique function. Achiervements of the project includes following: 1>Established active cochlea nonlinear dynamic model with auditory characteristics such as compressed dynamic range; 2>Developed laser microvibration measurement technique and system with subnanometer resolution and no frequency distortion; 3>Mearured cochlea vibraiton and verified the dynamic characteristic of the model; 4>Established array model of cochlea signal processing based on nonlinear dynamci cochlea model,which performs speech character enhancing and anti-noise function.
英文关键词: cochlea;signal processing;nonlinear dynamics