[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 waveforms were used for frequency-domain analysis. The results revealed 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-domain 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 resonance of the external and the middle ear.