通过扬声器振膜位移测试频响曲线

Measure speaker's frequency response curve via diaphragm's excursion

目前大量使用的扬声器在线测试系统,都是馈给待测扬声器以激励信号,扬声器发声,测试传声器拾取该声音然后做分析,得到该扬声器的电声学特性。可实际车间里有诸多因素如机器噪声、反射声等都会影响最终的测试结果。该文通过另外一种方式,用激光测距传感器测试扬声器振膜的振动位移,然后反演出扬声器的频响曲线等信息。通过大量实验得出:利用振膜位移曲线反演得到频响曲线在低频段可以和直接声学测试的频响曲线很好地拟合,同时振膜位移受周围环境噪声的影响较小,对环境依赖性较小,可以在生产线上应用。

On-line measurement is mandatory in the speaker industry, so far the measurement processing is to feed the speaker electrical signal to make it generate Sound, then the measurement microphone picks up the sound for analysis, get the electroacoustic parameters of the speaker. Actually there is a lot of noise and reflection in workshop. These affect the final measurement result. The article is trying to use another way, use laser displacement meter to excursion can match the measured frequency response curve well at low frequency diaphragm ＇s excursion is less affected by ambient noise, less environment dependent, applied in procuction lines.