Abstract
Pure Tone Audiometry (PTA) is the fundamental method for determining a subject's hearing threshold. The process is described in detail in ISO 8253-1, which also includes information about the measurement uncertainty of PTA in Annex A. Because the major value is based on the allowable tolerance of each equipment and the assumed value with sufficient margin. In this study, the factors contribute to the uncertainty of audiometer calibration and PTA are investigated in the quantitative manner. There are two main groups of uncertainty components: the audiometer and the subject. Components related to the audiometer include uncertainties in the stimuli of audiometer and it can be evaluated by the calibration of audiometer. The calibration process is thoroughly examined and the uncertainties in airborne audiometry are evaluated. The effect of components related to the subject include the effects of head size on tension, ear shape on cavity volume, and headphone placement are observed by using an ear simulator and a dummy head.
Published Version
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