Procedures for ambient-pressure and tympanometric tests of aural acoustic reflectance and admittance in human infants and adults
Procedures for ambient-pressure and tympanometric tests of aural acoustic reflectance and admittance in human infants and adults
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DOI：
10.1121/1.4936946
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发表时间：
2015-12-01
影响因子：
2.4
通讯作者：
Fitzpatrick, Denis F.
中科院分区：
文献类型：
--
作者：
Keefe, Douglas H.;Hunter, Lisa L.;Fitzpatrick, Denis F.
描述了在 0.2 至 8 kHz 频率下测量成人和婴儿耳朵的声反射率和导纳的程序。传递函数是在耳道内的环境压力下以及向下或向上扫描的鼓室导抗图上测量的。声学估计的耳道面积用于计算耳朵反射率，该反射率通过所有频率（和压力）上的吸光度和群延迟进行参数化，并大量减少鼓室图的数据。使用具有指定面积和耳道长度的耳道的传输线模型，将成人探头尖端测量的导纳转换为耳膜处的等效导纳。耳道长度是根据最小吸光度 2 kHz 以上频率附近的群延迟来估计的。描述了对具有正常听力和传导性听力损失的成人和两个 1 个月大的婴儿的具有正常功能的耳朵的说明性测量。针对不同的面积和长度估计，计算了该等效鼓膜导纳的灵敏度。婴儿耳的吸光度峰值与群延迟的下降频率一致的模式可以通过共振耳道壁迁移率模型来解释。该程序将应用于宽带临床诊断和中耳和耳蜗功能监测的大型研究。 (C) 2015 年美国声学学会。
Procedures are described to measure acoustic reflectance and admittance in human adult and infant ears at frequencies from 0.2 to 8 kHz. Transfer functions were measured at ambient pressure in the ear canal, and as down-or up-swept tympanograms. Acoustically estimated ear-canal area was used to calculate ear reflectance, which was parameterized by absorbance and group delay over all frequencies (and pressures), with substantial data reduction for tympanograms. Admittance measured at the probe tip in adults was transformed into an equivalent admittance at the eardrum using a transmission-line model for an ear canal with specified area and ear-canal length. Ear-canal length was estimated from group delay around the frequency above 2 kHz of minimum absorbance. Illustrative measurements in ears with normal function are described for an adult, and two infants at 1 month of age with normal hearing and a conductive hearing loss. The sensitivity of this equivalent eardrum admittance was calculated for varying estimates of area and length. Infant-ear patterns of absorbance peaks aligned in frequency with dips in group delay were explained by a model of resonant canal-wall mobility. Procedures will be applied in a large study of wideband clinical diagnosis and monitoring of middle-ear and cochlear function. (C) 2015 Acoustical Society of America.