Boys Town National Research Hospital, 555 North 30th Street, Omaha, Nebraska 68131, USA.
J Acoust Soc Am. 2011 Dec;130(6):3873-81. doi: 10.1121/1.3654019.
A number of acoustical applications require the transformation of acoustical quantities, such as impedance and pressure that are measured at the entrance of the ear canal, to quantities at the eardrum. This transformation often requires knowledge of the shape of the ear canal. Previous attempts to measure ear-canal area functions were either invasive, non-reproducible, or could only measure the area function up to a point mid-way along the canal. A method to determine the area function of the ear canal from measurements of acoustic impedance at the entrance of the ear canal is described. The method is based on a solution to the inverse problem in which measurements of impedance are used to calculate reflectance, which is then used to determine the area function of the canal. The mean ear-canal area function determined using this method is similar to mean ear-canal area functions measured by other researchers using different techniques. The advantage of the proposed method over previous methods is that it is non- invasive, fast, and reproducible.
许多声学应用需要将在耳道入口处测量的声学量（如阻抗和压力）转换为鼓膜处的量。这种转换通常需要了解耳道的形状。以前尝试测量耳道面积函数的方法要么具有侵入性，要么不可重复，要么只能测量到沿耳道中间的某个点的面积函数。本文描述了一种从耳道入口处的声阻抗测量值确定耳道面积函数的方法。该方法基于反问题的解，其中使用阻抗测量值来计算反射率，然后使用反射率来确定耳道的面积函数。使用该方法确定的平均耳道面积函数与其他研究人员使用不同技术测量的平均耳道面积函数相似。与以前的方法相比，该方法的优点是它是非侵入性的、快速的且可重复的。
