一种改进的窄带信号降噪算法及其应用

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振动与冲击 ›› 2013, Vol. 32 ›› Issue (16) : 59-63.

论文

一种改进的窄带信号降噪算法及其应用

宋军1,2，刘渝1，王旭东1

作者信息 +

An Improved Denoising Algorithm for Narrow-band Signal and its Application

Song Jun1,2, Liu Yu1, Wang Xudong1

Author information +

文章历史 +

摘要

提出了一种改进的基于FFT窄带信号频域降噪算法，并研究了其在宽带信号分段滤波中的应用。针对传统的基于FFT窄带信号频域去噪方法的不足，首先估计出信号频率与量化频率点的偏离程度，然后对信号进行频移，使信号频率尽量接近量化频率点，再进行频域滤波，并对滤波后信号逆向频移恢复原信号。最后，采用这种基于频移的窄带信号降噪算法对宽带信号进行分段滤波处理。Matlab仿真表明，改进的算法在不同的频率段内性能，且明显优于传统的窄带信号频域去噪算法。

Abstract

An improved denoising algorithm based on FFT for narrow band signal was investigated, and its application in segmentation filtering for broadband signal was also proposed. Aiming at the disadvantage of the traditional FFT-based denoising algorithm for narrow band signal, an improved one was proposed. Firstly, we estimated the deviation between the signal’s centre frequency and the maximum bin, and then a frequency shift was adopted to make up the deviation so that the signal’s centre frequency is sufficiently close to the maximum one. In succession, the new signal after frequency shift was filtered in frequency domain based on FFT, and then an inverse frequency shift was used to recover the original frequency. At last, the proposed improved denoising algorithm was adopted in segmentation filtering for broadband signal. Simulation results indicate that the proposed algorithm can do better than traditional one in all frequency areas.

导出引用

宋军;刘渝;王旭东. 一种改进的窄带信号降噪算法及其应用[J]. 振动与冲击, 2013, 32(16): 59-63

Song Jun;Liu Yu;Wang Xudong. An Improved Denoising Algorithm for Narrow-band Signal and its Application[J]. Journal of Vibration and Shock, 2013, 32(16): 59-63