摘要
针对飞机AMU自动测试系统中对音频信号失真度测量的要求,运用PC机和数据采集卡,采用加窗FFT、把整个主瓣的宽度作为基波值来计算基波分量有效值的算法实现了在计算机中对音频信号失真度的直接测量。实验验证,该方法可对组件维护手册(CMM)中所有频率的测试信号进行精确的失真度计算,具有频率范围广、精度高、简便易行等特点。
The instrument of distortion measuring is studied by using the PC and PCI data acquisition card to the automatic test Equipment of AMU. The principle of the device is the conversion of the FFT of signal. It is proved that this method can measure the harmonic distortion of all the signals which are mentioned in the CMM,thus having the advantages of wide frequency, high precision and convenience.
出处
《中国民航学院学报》
2006年第6期6-8,13,共4页
Journal of Civil Aviation University of China
基金
中国民用航空总局科技基金项目(MY0421810)
