CLINICAL APPLICATION AND WAVELET ANALYSIS OF TRANSIENTEVOKED OTOACOUSTIC EMISSIONS (TEOAE) SIGNALS
耳声发射信号的小波分析及应用

In order to diagnose and locate the defected site of two main sensori-neural hearing loss which are cochlear hearing loss and retrocochlear hearing loss, a technique that based on continuous wavelet transform for the signals of Transient Evoked Otoacoustic Emissions (TEOAE) and TEOAE suppressed by contralateral acoustic stimulation (CAS) was proposed. First, two curves' range, which are information about the relation of TEOAE's Root Mean Square (RMS)-frequency and the relation of the suppressed RMS-frequency for the normal hearing ears were obtained. Then, the subject's RMS-frequency curve and the suppressed RMS-frequency curve were compared with the two normal-hearing curves' range. The sensori-neural hearing loss disease can be diagnosed, and the defected site can be further located. A comparison is made between the clinical methods and our technique for the same subject and the result are essentially consistent. This technique provided the quantitative analysis method for studying the function of the auditory efferent system, and potentially promoted the fundamental study and the clinical application of the Otoacoustic emissions.