对侧刺激声作用下瞬态诱发耳声发射信号的相位研究

Phase Variation Analysis of Transient Evoked Otoacoustic Emission Signal with or without Contralateral Acoustic Stimulation.

目的研究有无对侧刺激声作用下瞬态诱发耳声发射信号相位变化的定量计算方法。方法提出了采用互相关法定量计算有无对侧刺激声作用下瞬态诱发耳声发射信号相位差的方法。结果采用互相关法确定相位差 ,不但将发生相位变化的频率点准确定位 ,而且将相位的变化量准确求出。结论此方法弥补了采用“相位相关法”确定相位变化的不足 ,为进一步定量研究对侧刺激声作用下耳声发射信号相位的变化打下了基础。

Objective To study the phase quantitative variation of transient evoked otoacousic emission(TEOAE) signal with or without contralateral acoustic stimulation(CAS). Method A 'cross correlation' method was put forward and applied to TEOAE signal and TEOAE with or without the CAS. Result It showed that this method not only pinpointed the phase variation in frequency,but also calculated the phase variation quantitatively. Conclusion The technique made up for the shortage of the 'phase coherence'method. It was very helpful for further quantitative study of the phase variation of OAE signal.