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個人報告

個人報告. 老師：侯春茹 學生：陳勤明. 濾波 ＦＩＲ與移動平均濾波 功率頻譜密度. 濾波程式. 濾波後強度頻譜比較. 濾波後強度頻譜程式. M 點移動平均濾波器. M 點移動平均 濾波器程式. M=5; yy =[]; for i =1:1:N-M+1 yy1=f7(i:i+M-1); yy2=mean(yy1); yy =[ yy yy2]; end yy5= yy ; %10 M=10; yy =[];. for i =1:1:N-M+1 yy1=f7(i:i+M-1); yy2=mean(yy1);

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個人報告

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  1. 個人報告 老師：侯春茹學生：陳勤明 濾波 ＦＩＲ與移動平均濾波 功率頻譜密度

  2. 濾波程式

  3. 濾波後強度頻譜比較

  4. 濾波後強度頻譜程式

  5. M點移動平均濾波器

  6. M點移動平均濾波器程式 • M=5; • yy=[]; • for i=1:1:N-M+1 • yy1=f7(i:i+M-1); • yy2=mean(yy1); • yy=[yy yy2]; • end • yy5=yy; • %10 • M=10; • yy=[]; • for i=1:1:N-M+1 • yy1=f7(i:i+M-1); • yy2=mean(yy1); • yy=[yy yy2]; • end • yy10=yy; • fs=1024; • T=1/fs; • r_yy_M5=xcorr(FIR5',FIR5'); • fft_r_yy_M5=fft(r_yy_M5); • N=length(r_yy_M5) • fd=1/(N*T); • fy=(0:(N-1)).*fd;

  7. FIR與移動平均濾波器

  8. FIR程式 • %FIR • M1=5; • b1=ones(M1,1)/5; • FIR5=filtfilt(b1,1,f7); • M2=10; • b2=ones(M2,1)/5 • FIR10=filtfilt(b2,1,f7);

  9. 功率頻譜密度-直接法

  10. 功率頻譜密度-間接法

  11. 功率頻譜密度程式 • xcorr_SignalData_detrend=xcorr(f7,f7); • N=length(f7); • xx1=xcorr_SignalData_detrend(N:(2*N-1)); • % Indirect method • xf1=fft(xx1); • xpsd1=abs(xf1(1:N/2)); • % Direct method • xf2=fft(f7); • xpsd2=abs(xf2(1:N/2)).^2; • f=2.*(0:N/2-1); • figure(7) • plot(f,xpsd1) • xlabel('f/fs') • ylabel('Magnitude') • title('Power Spectral Density Indirect method') • figure(8) • plot(f,xpsd2) • xlabel('f/fs') • ylabel('Magnitude') • title('Direct method')

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