时选窗技术在传声器自由场互易校准中的运用  

Time selective window technique in microphone reciprocity calibration in free field

作　　者：郝豫川[1] 蒲志强[1] 周远波[1] 雷强[1] 

机构地区：[1]中国测试技术研究院,四川成都610021

出　　处：《中国测试》2010年第4期10-12,17,共4页China Measurement & Test

摘　　要：实验室标准传声器的自由场互易校准是复现声压量值的一种基本方法,在测量过程中需要测试系统具有很高的信噪比。在空气声自由场声压基准装置中采用了步进正弦信号扫描和时间延迟谱技术测量传声器转移阻抗复频率响应,并采用IFFT得到脉冲响应,通过时域窗口消除反射,有效提高了信噪比,在体积较小的消声箱内完成了互易校准。Free field calibration of laboratory standard microphone is a basic method of reproducing sound pressure quantity,but high signal-to-noise ratio is required for the measuring system.In this work,stepped sine sweeping and time delay spectrometry were used to measure the complex frequency response of transfer impedance of microphone.Impulse respond was achieved using time window erasing reflection.By this way,the signal-to-noise ratio is improved effectively and reciprocity calibration can be performed in sma...

关 键 词：步进正弦 时间延迟谱 互易校准 实验室标准传声器 

分 类 号：TN641[电子电信—电路与系统]