摘要
离散傅立叶变换(DFT)存在误差。分析DFT泄露误差对声强测量的影响,进行模拟计算。计算结果表明:DFT泄漏误差将引起声强的泄露,在多个频率情况下还可能导致出现不合理的负声强。继而进行实验实测,实测结果与理论分析结论相同。
The discrete fourier transform （DFT） exists the errors. The influence of the DFT leakage errors on the sound intensity measurement is analyzed and the simulation examples are presented. The calculation result shows the errors of DFT will cause the sound intensity leakage, and even occur the unreasonable negative sound intensity in the situations of the muhi-frequency signals. An experiment is carried out, which verifies the theoretical analysis.
出处
《噪声与振动控制》
CSCD
北大核心
2007年第6期123-126,共4页
Noise and Vibration Control
关键词
声学
声强测量
DFT
泄露误差
acoustics
sound intensity measurement
DFT
leakage error
