关于滑动DFT算法中的频谱泄漏问题的探讨

An Exploration of the Sliding DFT Spectral Leakage

针对滑动DFT算法中的频谱泄漏效应的处理问题,提出用频域加窗的办法,避免了时域加窗中窗与输入信号的N次相乘,破坏滑动DFT实时计算的简捷性、可靠性,保证了滑动DFT算法的实现与优化。在硬件实现上,用3个结构简单的谐振器,将其谐振频率分别调到3个相邻的DFT频率单元,即可实现此处理过程。

This article puts forward a technique of frequency- domain windowing in order to solve the problem about the spectral leakage of the sliding DFT. Time - domain windowing leads to complex multiplications of the order of N,and would ruin the real - time computational simplicity and the flexibility of the sliding DFT. The frequency- domain windowing realize the optimized algorithm of the sliding DFT. It will realize this process using three simple resonators,each turned to adjacent DFT bins.