广义时频分析方法在耳声发射研究中的应用 Ⅱ.短声与短纯音诱发耳声发射信号的时频分布

APPLICATION OF GENERALIZED TIME-FREQUENCYANALYSIS METHOD FOR OTOACOUSTIC EMISSIONS Ⅱ. TIME-FREQUENCY DISTRIBUTION OF CLICK AND TONE-BURST EVOKED OTOACOUSTIC EMISSIONS

为了进一步探讨耳声发射的产生机制 ,需要研究不同类型刺激诱发的耳声发射之间的相互关系。主要研究短声与短纯音诱发的耳声发射 ,用广义时频分析方法中的锥形核分布分别计算了它们的时频分布 ,从其时频分布分析了它们之间的相互关系。结果表明 :具有不同中心频率的短纯音刺激诱发耳声发射的时频分布的迭加与短声刺激诱发的耳声发射的时频分布具有相似性 ,两者时频分布中的主要频率成分数目、潜伏期和持续时间完全相同 ,它们高度的相关性支持了短声与短纯音诱发的耳声发射具有共同的产生器的观点。

To investigate the production mechanism of Otoacoustic emissions(OAEs), it needs studying the correlation among OAEs evoked by different types of stimulus. In this paper, the time-frequency distributions of the click evoked OAEs (CEOAEs) and tone-burst evoked OAEs(TBOAEs) are computed using the method of cone-shaped kernel distribution (CKD) and their correlation is analyzed. The results are as follows: the CKD of the CEOAEs and the sum of the CKDs of the TBOAEs evoked by the tone-bursts stimulus with different central frequencies are similar. The high degree of correlation offers support to the view that both types of transient emissions share common generator.