一种基于FPGA的高速短时傅里叶实现

Implementation of STFT based on FPGA

短时傅里叶变换(STFT)由于其算法简单、处理时间短及易于实现等优点,因此其在图像处理、语音分析、信号检测及参数估计等领域获得越来越多应用。通过分析短时傅里叶变换算法原理,设计了一种基于现场可编程逻辑器件(FPGA)的高速短时傅里叶实现结构,该结构充分利用蝶形单元运算特点,在满足时间分辨率及频率分辨率的基础上降低了运算复杂度,并在高速率运行时钟下节省了硬件资源。

For its short processing time and easy implementation, STFTC （Short Time Fourier Transform） is increasingly applied in the image processing and signal detection. Based on analysis of STFT, a new FPGA-based rapid STFT implementation architecture is proposed and designed. By fully utilizing the operational property of Butterfly processing element, this architecture could reduce the computation complexity on the basis of satisfying frequency and time resolution, and thus save the hardware resource in high-speed operating clock.