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DESIGN AND ANALYSIS OF IMPROVED BUTTERWORTH LOW PASS FILTER

Platform : DSP

IEEE Reference: Li Zhongshen; Huaqiao Univ., Quanzhou This paper appears in: Electronic Measurement and Instruments, 2007. ICEMI '07. 8th International Conference on AIM: Design and analisys of filter for low pass signals ABSTRACT The conventional Butterworth low pass filter exists the contradiction problems between test precision, stability and response time, so a kind of improved Butterworth low pass filter is put forth in this paper. Firstly nth order improved Butterworth low pass filter, whose n poles are chosen from poles of (n+2)th order Butterworth low pass filter, is deduced. Lastly, the improved Butterworth low pass filter is analyzed. Compared with the conventional Butterworth low pass filter of the same order, the improved Butterworth low pass filter has rapider response, smaller overshoot. This kind of filter can be used to enhance the test precision. LEARNING OBJECTIVE: To analyze precision, stability and response time of low pass filter for improvement of low pass filter. INPUT: Raw version of speech signal OUTPUT : Filtered version of speech signal APPLICATIONS: Speech communication SOFTWARE TOOL USED : MATLAB 2007A

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