新生儿和正常青年人瞬态诱发耳声发射的频谱分析

选用短声及短音１ｋＨｚ和２ｋＨｚ作为瞬态刺激声，对１８名正常产新生儿及１８名正常青年人进行诱发耳声发射测试，并将所测得的瞬态诱发耳声发射（ＴＥＯＡＥ）波形进行频域分析。结果表明：两年龄组及三种刺激声的ＴＥＯＡＥ检出率比较差异无显著性，但新生儿组短声ＴＥＯＡＥ检出率（９１．７％）低于国外资料报道，提示生后４天内测试ＴＥＯＡＥ会影响检出率。频谱分析表明：两年龄组及三种刺激声的ＴＥＯＡＥ频谱带宽间比较差异无显著性，但ＴＥＯＡＥ的频谱峰值随刺激声的不同而不同，其频谱特征与刺激声频率间有某种依赖关系，考虑与内耳机械、调谐特性，外耳、中耳谐振等多因素相关。

The Frequency domain Analysis of TEOAE in Neonates and Youths

Transiently evoked acoustic emissions(TEOAE)is a rapid, noninvasive and objective audiologic method. It has been used in clinic, In order to observe effects of transient stimulus sounds on TEOAE,TEOAE evoked by click and tone-pip(1kHz, 2kHz)was examined in 18 neonates and 18 youths. The observed TEOAE wave forms were used for frequency-domain analysis. The results re-vealed that there were no significant differences in TEOAE incidence between the neonates and youths,and among the three kinds of stimuli.The incidence of the click evoked acoustic emission in the neonate group(within 4 days post partum) was 91.7%,it was lower than those reported by other authors. The frequency dormain analysis showed that there were no significant differences of bandwidth among the three kinds of stimuli,but the frequency peak was different according to the different stimulus sounds.It was found that there were somewhat dependence of TEOAE characteristic spectrum on stimulus sound frequency,this might be related to the mechanical tuning property of the inner ear and the reso-nance of the external and the middle ear.