셈툴 다운로드

셈툴 튜토리얼

신호처리 | 디지털 제 1형 체비셰프 필터 설계 |

페이지 정보

작성자 cemtool 작성일14-04-23 19:05 조회12,033회 댓글0건

본문

디지털 제 1형 체비셰프 필터를 설계해보자.

ex8_18.cem
% Chapter 8: Example 8.18%           
% BiLinear Transformation:
% Chebyshev-1 Lowpass Filter Design
%% Digital Filter Specifications: /* Digital Filter Specifications: */
 wp = 0.2*pi;                          /* digital Passband freq in Hz */
 ws = 0.3*pi;                          /* digital Stopband freq in Hz */
 Rp = 1;                               /* Passband ripple in dB */
 As = 15;                              /* Stopband attenuation in dB */
 
 /* Analog Prototype Specifications: Inverse mapping for frequencies */
 T = 1; Fs = 1/T;                      /* Set T=1 */
 OmegaP = (2/T)*tan(wp/2);             /* Prewarp Prototype Passband freq */
 OmegaS = (2/T)*tan(ws/2);             /* Prewarp Prototype Stopband freq */
 
 /* Analog Chebyshev-1 Prototype Filter Calculation: */
 [cs,ds] = chb1lpf(OmegaP,OmegaS,Rp,As);
 
 
 /* Bilinear transformation: */
 [b,a] = bilinear(cs,ds,T);
 [C,B,A] = drt2cas(b,a) 
 
 
% Plotting
figure;
 
 subplot(1,1,1)[db,mag,pha,grd,w] = mfreq_z(b,a);
subplot(2,2,1); plot(w/pi,mag); title("Magnitude Response")
xtitle("frequency in pi units"); ytitle("|H|");
 
subplot(2,2,3); plot(w/pi,db); title("Magnitude in dB");
xtitle("frequency in pi units"); ytitle("decibels");
 
subplot(2,2,2); plot(w/pi,pha/pi); title("Phase Response")
xtitle("frequency in pi units"); ytitle("pi units");
 
subplot(2,2,4); plot(w/pi,grd); title("Group Delay")
xtitle("frequency in pi units"); ytitle("Samples");


댓글목록

등록된 댓글이 없습니다.