耳声发射检测系统研究

【作者】 丁兵；

【导师】 闫卫平；

【作者基本信息】 大连理工大学 ， 测试计量技术及仪器， 2000， 硕士

【摘要】 耳声发射现象及其临床应用是二十世纪九十年代生物医学和耳科研究的一项重要的进展，它揭示了耳除了具有感受声音的能力之外还具有主动发射声波的能力，它的存在与否是听觉外周系统是否完好的客观指标。耳声发射的检测将以其无创、客观、快速成为很有前途的耳科诊断手段。 本文针对人们已经了解到的耳声发射的特点设计了一种适合于听觉普查的耳声发射检测系统，它既适合于检测瞬态诱发耳声发射（TEOAE）又适合于检测畸变产物耳声发射（DPOAE）。采用了最新的数字信号处理芯片及各种高性能、低功耗的集成电路芯片，具有灵活、便携、先进、成本低廉的特点。 系统在硬件上采用高速数字信号处理单片机TMS320F206与通用单片机AT89C52组成主从结构作为系统的核心，以先进的直接数字合成芯片作为刺激信号产生单元，以高性能程控放大器和程控滤波器以及高速高分辨率A/D转换器作为构成系统的输入通道，采用点阵液晶显示器进行汉字菜单与图形显示，系统具有大容量存储和远传功能，并能与计算机直接通信，采用便携式仪器的省电供电方案。在软件上采用成熟的信号处理技术以及最新的小波分析技术进行耳声发射的信号处理，能获得满意的效果。更多还原

【Abstract】 One of the most exciting advances in our understanding of hearing processes during recent years has concerned the discovery of otoacoustic emissions(OAEs). The recognition that the cochlea not only receives sound, but also produces acoustic energy has been a major factor in modifying recent thinking concerning cochlear function. OAEs can be measured noninvasively, objectively and quickly. Because OAEs in ears with certain types of hearing loss are absent or reduced relative to those in normal ears, OAEs have great potential for use in diagnosis of cochlear dysfunction. In this paper we researched and designed an instrument for the measurement of both TEOAE and DPOAE. In this instrument we use two CPU structure (TMA320F206&AT89C52) , programmable amplifier, programmable filter, direct digital synthesis chip, high speed & high resolution AID converter and LCD. It has the functions of remote transmission and communicating with computer directly. It also has a power saving power board suited for portable instrument. We adopted digital signal processing technology and wavelet analysis method to realize the recognition of OAE signal. Wish to acquire satisfactory result.更多还原