利用虚拟教学听力计测量人耳听阈曲线

摘要

To test the performance of a virtual audiometer for teaching, an oscilloscope was used to measure the frequency and peak voltage of a series of pure tone signals.With a headset, the hearing threshold curves of eight students and a 50-year-old female teacher were recorded.The results showed that the relative error of the frequency of each pure tone signal was less than 0.3%, the disagreement between the displayed intensity in decibels and the calculated one of each pure tone was less than 5% for all the test points, and the hearing threshold curves of all nine tested persons were in consistent with the reference curve.The performance of the virtual audiometer for teaching was basically the same as that of the audiometers used in practice.%为检验虚拟教学听力计的性能及测试效果,利用示波器测量了各纯音信号的频率和电压峰峰值,通过耳机测试听阈曲线表明:各纯音信号频率的相对误差小于0.3%,界面显示的分贝值与计算得出测试点纯音分贝值的相对误差小于5%,被测试者的听阈曲线与参考曲线基本一致.由此可知:所用虚拟教学听力计与实际听力计性能基本相同.