摘  要：目前大量使用的揚(yáng)聲器在線測(cè)試系統(tǒng)，都是饋給待測(cè)揚(yáng)聲器以激勵(lì)信號(hào)，揚(yáng)聲器發(fā)聲，測(cè)試傳聲器拾取該聲音然后做分析，得到該揚(yáng)聲器的電聲學(xué)特性。可實(shí)際車(chē)間里有諸多因素如機(jī)器噪聲、反射聲等都會(huì)影響最終的測(cè)試結(jié)果。該文通過(guò)另外一種方式，用激光測(cè)距傳感器測(cè)試揚(yáng)聲器振膜的振動(dòng)位移，然后反演出揚(yáng)聲器的頻響曲線等信息。通過(guò)大量實(shí)驗(yàn)得出：利用振膜位移曲線反演得到頻響曲線在低頻段可以和直接聲學(xué)測(cè)試的頻響曲線很好地?cái)M合，同時(shí)振膜位移受周?chē)h(huán)境噪聲的影響較小，對(duì)環(huán)境依賴性較小，可以在生產(chǎn)線上應(yīng)用。
關(guān)鍵詞：揚(yáng)聲器；振膜位移；頻響曲線
中圖分類(lèi)號(hào)：TN64；O329；TM935.23；TP274+.2        文獻(xiàn)標(biāo)志碼：A      文章編號(hào)：1674-5124（2013）05-0031-03
Measure speaker’s frequency response curve via diaphragm’s excursion
WANG Lin-na1， JING Ni-qin1， WU Guo-qiao2
（1. Beijing Polytechnic，Beijing 100016，China；
2. North China Institute of Computing Technology，Beijing 100083，China）
Abstract: 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 measure speaker diaphrangm’s excursion， then calculate the speaker’s frequency response and other items. A lot of test results show the calculated frequency response curve via diaphragm’s excursion can match the measured frequency response curve well at low frequency range， and diaphragm’s excursion is less affected by ambient noise， less environment dependent， so can be applied in procuction lines.
Key words: speaker； diaphragm’s excursion； frequency response curve