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为确定听力正常人的瞬态耳声发射基本特征,了解不同刺激强度对瞬态耳声发射的平均振幅和频谱的影响,以作为与听力异常的人群进行对照的标准.利用地—88耳动态分析仪对听力正常的25耳进行测试,分别记录用70、76、82 dB SPL三种刺激声刺激时的瞬态耳声发射的平均振幅和频谱,三种刺激声强度下,瞬态耳声发射的平均振幅分别为5.97、9.22、12.76 dB SPL,增长率分别为54.4%、39.4O,频谱的频率分布于0.4～6kHz范围内,以4kHz以下为主,其峰值位于1025、1513Hz处,以 P_95为指标,在刺激声强度低于82 dB SPL时,瞬态耳声发射的频谱中各频率点的强度有不同程度的升高,由于听力正常人的频谱具有相对不连续性的高频下降趋势,与正常人纯音听阈并不完全对应,故不能单纯根据瞬态耳声发射的频谱对纯音听阈进行评估,而要综合考虑.
To determine the basic characteristics of transient otoacoustic emissions in normal individuals and to understand the effects of different stimuli on the average amplitude and spectrum of transient otoacoustic emissions as a criterion for comparison with people with hearing impairment, The analyzer tested 25 normal hearing ears and recorded the average amplitude and spectrum of transient otoacoustic emissions when stimulated with 70, 76 and 82 dB SPL respectively. Under the three stimulation intensities, transient otoacoustic The average amplitudes of emission were 5.97, 9.22 and 12.76 dB SPL respectively, with the growth rates of 54.4% and 39.4O respectively. The frequency spectrum of the spectrum was distributed in the range of 0.4-6 kHz, with the frequency below 4 kHz and the peak at 1025 and 1513 Hz. P_95 as an index. When the stimulus intensity is lower than 82 dB SPL, the intensity of each frequency point in the transient otoacoustic emissions increases to some extent. Due to the relatively discontinuous high-frequency drop of the frequency spectrum of a normal hearing person Trend, and normal pure tone threshold does not correspond exactly, it can not simply based on the transient otoacoustic emissions pure tone threshold to be assessed, but to be considered.