文章摘要
盛成明,唐锁夫,刘超.小波阈值法在信号滤波中的应用研究[J].声学技术,2014,33(5):481~484
小波阈值法在信号滤波中的应用研究
The application study of wavelet threshold method for signal filtering
投稿时间:2013-05-08  修订日期:2013-07-11
DOI:10.3969/j.issn1000-3630.2014.05.019
中文关键词: 阈值函数  小波  滤波
英文关键词: threshold function  wavelet  filter
基金项目:
作者单位E-mail
盛成明 海军702厂, 上海 200434 tsf2000@163.com 
唐锁夫 海军702厂, 上海 200434  
刘超 海鹰集团, 江苏无锡 214000  
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中文摘要:
      针对硬阈值函数在阈值处不连续,重构信号易产生振荡,以及软阈值函数的量化值与原始小波系数有恒定的偏差不能逼近的问题,提出了一种既能在阈值处连续,又能实现逼近原始小波系数的改进型阈值函数。仿真结果显示将改进型的阈值函数用于信号滤波,在均方误差和信噪比方面 都优于传统的两种阈值函数。
英文摘要:
      According to the fact that oscillation occurs in the reconstruction signal because of discontinuous threshold function at threshold point and the fact that an approximate problem arises owing to the permanent bias between quan-tized value of soft threshold function and original wavelet coefficient, a modified threshold function is proposed. The modified function is continuous at threshold point and can approximate the original wavelet coefficient. The results of simulation demonstrate that the modified threshold function is superior to traditional methods in both MSE and SNR.
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