An Investigation of Low-Frequency Distortion Product Otoacousic Emission

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  • Taiji Hidenobu
    Tsukushino ENT Clinic Department of Otorhinolaryngology, Saiseikai Central Hospital
  • Okamoto Yasuhide
    Department of Otorhinolaryngology, Saiseikai Central Hospital
  • Kanzaki Jin
    Department of Otorhinolaryngology, Saiseikai Central Hospital

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  • 低音域 DPOAE に関する検討
  • テイオンイキ DPOAE ニ カンスル ケントウ

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Abstract

<p>　The desirable measurement conditions of DPOAE at 500 Hz were examined. When the relationship between the f2/f1 ratio and the DP level was investigated in subjects with normal hearing, the variations were found to be large, but at 500 Hz, the DP level was maximal when the f2/f1 ratio was larger than 1000 Hz. A 1-D transmission-line model of the basilar membrane (128 sections) was constructed to predict the amplitude of DPOAEs. The following features of 2f1-f2 DPOAE were well explained by computing the summation of the primaries between f1 and f2: (1) With increasing stimulus tones, 2f1-f2 DPOAE increases in amplitude at a growth rate of <1 dB/dB. In cases of impairment of the outer hair cells, the DPOAE amplitudes are reduced and the slope of the DPOAE input/output function is steeper as compared to that in cases of normal hearing. (2) An L1 amplitude of about 10 dB louder than that of L2 evokes the strongest DPOAE. Since this model was considered valid, the effect of the f2/f1 ratio on DPOAE amplitude was examined using the basilar membrane motion model. It is thought that the DPOAE is largest at when the f2/f1 ratio is 1.22, which is the default, but it is better to set the f2/f1 ratio=1.26 for evaluation at 500Hz. Since it is necessary to increase the sampling number for FFT analysis in the low frequency range, further instrument development is required for DPOAE measurement at <500 Hz.</p>

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