摘要
在小波变换的实际应用中,希望小波滤波器具有良好的选频特性。文章由常用几种滤波器系数分析和计算它们的幅频特性,给出各级小波滤波器中心频率的表达式。运用小波变换,对信号进行正交分解测量电功率,并讨论滤波器幅频特性混叠对测量结果的影响,指出必须构造频域特性良好的小波函数,以改善检测精度。
In practical applications of the wavelet transform,there is an requirement that the wavelet filter should possess good frequencyselection characteristic. In this paper, the amplitudefrequency characteristics of several kinds of wavelet filters are analyzed and calculated, and the equations of their central frequencies are presented. The wavelet transform is applied to power measurement. The affection of frequency alias of amplitudefrequency characteristics is discussed. It is pointed out that it is necessary to construct new wavelet with good frequency performance for improving the measuring precision.
出处
《合肥工业大学学报（自然科学版）》
CAS
CSCD
2003年第2期171-175,共5页
Journal of Hefei University of Technology：Natural Science
基金
高等学校骨干教师资助计划项目[(2000)65号]
