摘要
对小波包消噪中的两个关键点——阈值的选择和小波包系数的阈值量化进行了分析,并对阈值选择方法进行了改进。通过仿真试验,用信号消噪前后的信噪比和均方误差两个指标对各种方法进行对比分析。结果表明,改进后的阈值选择方法优于其他方法。
Wavelet packet analysis is a precise analysis method. There are two key points--choosing threshold and quantitating threshold of wavelet packet coefficients--in wavelet packet de-noising method. In this paper, the two points in different methods are analyzed and compared, and the choosing threshold method is improved. Through simulative test, comparing SNR and MSE of original signal and that of signal after de-noising to evaluate the effect of those methods, it is proved that the improved method attains good results and is superior to other methods.
出处
《大地测量与地球动力学》
CSCD
北大核心
2008年第4期102-106,110,共6页
Journal of Geodesy and Geodynamics
基金
山东省自然科学基金(2004XZ31)
中国科学院百人计划项目
关键词
变形信号
小波包
阈值
信号消噪
信噪比
distortion signal
wavelet packet
threshold
signal de-noising
SNR（ signal-noising ratio）
