The Research on Wavelet Transform in the Application of Choosing Analog Filter
WANG Weijia
XIAO Mingqing
ZHANG Lei
CHENG Maocai
Abstract：The inherent defects of Fourier transform basis have pitfalls that impede this approach to modify its frequency resolution according to the frequency range of the signal.In order to select an appropriate fil-ter from manifold of the different filters whose impedance band attenuation signal is the strongest in inhibi-tion and whose ripple of pass band is the least,two kinds of good filters are selected.Aimed at a weak sig-nal detector,these two kinds of filters are determined and the decomposed number of level of the signal in needs of wavelet is determined by using the pseudo??frequencies.And according to the algorithms of decom-position and reconstruction,the details of disassembling the signal after analog filter are analyzed.The re-sult shows that the approach of wavelet analysis can efficaciously provide a clear result of comparison,ob-tain the explicit disparities under the different frequency ranges for different types of analog filters,and se-lect optimum filters whose filterable effects are the best.
Keywords：WTalgorithms of decomposition and reconstructionanalog filter
Publication Date：2015-01-01
Pages：4( 70-73 )