仿真耳的高频校准

Calibration of artificial ear in the high-frequency range

仿真耳是听力计量的主要仪器之一,为满足听力计在8~16 k Hz高频范围内的计量需求,须对仿真耳进行高频校准。通过适配器的使用,解决了仿真耳高频校准中存在的测量结果不稳定的问题。同时,针对仿真耳中传声器声压灵敏度级和仿真耳声耦合腔声学特性这两项主要技术指标,建立了8~16 k Hz频率范围内的自动测量系统,对其进行测量。测量结果表明声压灵敏度级的标准偏差小于0.2 d B,表征耦合腔声学特性的频响测量标准偏差小于0.3 d B。

Artificial ear is the main measurement instrument for audiometry. To satisfy the demand for the value traceability of audiometers in a high-frequency range of 8~16 k Hz, It is necessary to calibrate the artificial ear in the corresponding frequency range. Here, the utilization of adaptors provides an effective solution to the problem of instability existing in the high-frequency calibration. Furthermore, an automatic calibration system is developed for the artificial ear system to measure both the sound pressure sensitivity levels of the microphone and the acoustic characteristic of the coupler in the range between 8~16 k Hz. The experimental results show that the standard deviations measured for these two parameters are lower than 0.3 d B and 0.2 d B, respectively.