다음 사양에 만족하는 제 1형 체비셰프 아날로그 저역통과 필터를 설계해보자.

• 통과대역 차단 주파수:; 통과대역 리플 : 
• 저지대역 차단 주파수:; 저지대역 리플 : 

ex8_6.cem

/*   Chapter 8: Example 8.6   Chebyshev-1 Lowpass Analog filter design
*/
 
  Wp = 0.2*pi; Ws = 0.3*pi; Rp = 1; As = 16;
 Ripple = 10 ^ (-Rp/20); Attn = 10 ^ (-As/20);
 /* Analog filter design: */
 [b,a] = chb1lpf(Wp,Ws,Rp,As);
 
 /* Calculation of second-order sections: */
[C,B,A] = sdrt2cas(b,a) 
 /* Calculation of Frequency Response: */
 [db,mag,pha,w] = mfreq_s(b,a,0.5*pi);
 /* Calculation of Impulse response:*/
 [ha,x,t] = impulse(b,a);
 
 
 
% Plots 
figure(1) 
subplot(2,2,1); plot(w/pi,mag);title("Magnitude Response")xtitle("Analog frequency in pi units"); ytitle("|H|");
 
subplot(2,2,2); plot(w/pi,db);title("Magnitude in dB")xtitle("Analog frequency in pi units"); ytitle("decibels");
 
subplot(2,2,3); plot(w/pi,pha/pi); title("Phase Response")xtitle("Analog frequency in pi units"); ytitle("radians");
 
subplot(2,2,4); plot(t,ha,[0,max(t)],[0,0]); title("Impulse Response")xtitle("time in seconds"); ytitle("ha(t)");