摘要
在分析了局域波方法特征的基础上,深入探讨了采样频率对局域波分解的影响.对单频正弦信号的分析结果表明,应用局域波分解对信号进行分析时,要对信号进行过采样.研究结果揭示了分解误差和采样频率的关系,验证了提高采样频率可以有效地降低分解误差.
Based on the study of local wave method, the effect of sample frequency was discussed. It was proposed that oversampling is necessary by analyzing the influence of different sample frequency on the decomposition of sine wave. The relation between decomposition error and sample frequency was revealed and it was also proved that increasing the sample frequency can effectively reduce the error.
出处
《上海交通大学学报》
EI
CAS
CSCD
北大核心
2006年第11期1976-1978,1982,共4页
Journal of Shanghai Jiaotong University
基金
国家自然科学基金资助项目(50475155)
关键词
局域波法
Hilbert谱
时频分析
local wave method
Hilbert spectrum
time frequency analysis
