신호처리 | 대역저지 필터 설계 |
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작성자 cemtool 작성일14-04-23 18:46 조회12,491회 댓글1건본문
이상적인 대역저지 필터의 주파수 응답이 다음과 같다.
카이저 창함수를 사용하여 길이 45, 저지대역 감쇠 60dB의 대역저지 필터를 설계하라.
- ex7_11.cem
/* Chapter 7: Example 7.11 Bandstop filter design - Kaiser window */ M = 45; As = 60; n=[0:M-1:1]; beta = 0.1102*(As-8.7) w_kai = (kaiser(M,beta))'; wc1 = pi/3; wc2 = 2*pi/3; hd = ideallp(wc1,M) + ideallp(pi,M) - ideallp(wc2,M); h = hd .* w_kai; [db,mag,pha,grd,w] = mfreq_z(h,[1]); /* plots */ subplot(1,1,1) plot(w/pi,db); title("Magnitude Response in dB"); xtitle("frequency in pi units"); ytitle("Decibels")pause
M = 45; As = 60; n=[0:M-1:1]; beta = 0.1102*(As-8.7)+.3 w_kai = (kaiser(M,beta))'; wc1 = pi/3; wc2 = 2*pi/3; hd = ideallp(wc1,M) + ideallp(pi,M) - ideallp(wc2,M); h = hd .* w_kai; [db,mag,pha,grd,w] = mfreq_z(h,[1]); /* plots */ subplot(1,1,1); subplot(2,2,1); stem(n,hd); title("Ideal Impulse Response") xtitle("n"); ytitle("hd(n)") subplot(2,2,2); stem(n,w_kai); title("Kaiser Window") xtitle("n"); ytitle("w(n)") subplot(2,2,3); stem(n,h); title("Actual Impulse Response") xtitle("n"); ytitle("h(n)") subplot(2,2,4); plot(w/pi,db); title("Magnitude Response in dB"); xtitle("frequency in pi units"); ytitle("Decibels")
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