CAJ | 학술논문

傅里叶变换基的固有缺陷导致传统滤波器选型分析方法在实际应用场合中经常不能有效地选择出最优滤波器。小波分析方法可以实现从多种不同滤波器中选择出阻带信号抑制最强，通带内波纹最小的滤波器。针对一型微弱信号检测装置，确定出两型较优的滤波器，利用小波伪频率确定小波分解所需分解层数，根据小波分解重构算法对滤波器输出信号的高频细节进行分析研究。仿真结果与模拟电路实验表明，与快速傅立叶变换的分析方法相比，小波分析可以提供清晰的对比分析结果，得到了在不同频率范围内，不同滤波器作用之后的差异明显的滤波效果，最终选择出滤波效果最佳的模拟滤波器。
부리협변환기적고유결함도치전통려파기선형분석방법재실제응용장합중경상불능유효지선택출최우려파기。소파분석방법가이실현종다충불동려파기중선택출조대신호억제최강，통대내파문최소적려파기。침대일형미약신호검측장치，학정출량형교우적려파기，이용소파위빈솔학정소파분해소수분해층수，근거소파분해중구산법대려파기수출신호적고빈세절진행분석연구。방진결과여모의전로실험표명，여쾌속부립협변환적분석방법상비，소파분석가이제공청석적대비분석결과，득도료재불동빈솔범위내，불동려파기작용지후적차이명현적려파효과，최종선택출려파효과최가적모의려파기。
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.