摘要
设计了一种基于SoPC的复合信号幅频测试仪,给出了基于Hamming窗频谱函数比例查表法,有效解决了FFT变换中栅栏效应问题。依靠IQMath函数库在NiosⅡ软核上进行了高速FFT运算,实现了在1.5 s内对复合频率信号的主次分量频率、幅度信息的精确计算,同时通过SoPC系统的DDS组件配合滤波电路实现了复合频率信号的精确重建。
In this paper, a composite signal amplitude frequency tester based on SoPC is presented. This paper gives a kind of spectrum function proportion look-up table method based on Hamming window, which effectively solves fence effect problems appeared in FFT transformation. This system, relying on IQMath library, goes on high-speed FFT computation in the Nios II softcore, and realizes high precision computation of primary and secondary signal frequency/amplitude information within 1.5 s. This design achieves high-precision reconstruction of composite frequency signal through DDS components of SoPC system with filter circuit.
出处
《电子技术应用》
北大核心
2010年第11期20-22,共3页
Application of Electronic Technique
