Лабораторная работа №4.


N=200;

Rp=abs(1/(20*log10(0.01)));

Rs=35;

Wp=[0.35 0.4];

Ws=[0.33 0.42];

[n,Wn]=cheb1ord(Wp,Ws,Rp,Rs);

[b,a]=cheby1(n,Rp,Wn,'stop');

[k,na]=size(a);

[k,nb]=size(b);

 

x=zeros(1,N);

y=zeros(1,N);

for i=1:N

   x(i)=sin(i*pi*0.2)+sin(i*pi*0.4);

end

y=filter(b,a,x);

 

x1=zeros(1,N);

y1=zeros(1,N);

for i=N/2:N

   x1(i)=1;

end

y1=filter(b,a,x1);

 

x2=zeros(1,N);

y2=zeros(1,N);

x2(N/2)=1;

y2=filter(b,a,x2);

 

[H,w]=freqz(b,a,N,2);

subplot(4,1,1),plot(x),grid

title('Входной сигнал')

subplot(4,1,3),plot(y),grid

title('Filtered Signal')

subplot(4,1,2),plot(w,abs(H)),grid

title('Filter AFC')

pause

subplot(4,1,1),plot(x1),grid

title('juytjuytujyt')

subplot(4,1,2),plot(y1),grid

title('Filtered')

subplot(4,1,3),plot(x2),grid

title('dfhdfhsdfgh')

subplot(4,1,4),plot(y2),grid

title('Filtered')


>> a

a =

Columns 1 through 7

1.0000 -5.0720 17.2441 -40.3768 75.3242 -111.9258 139.0281

Columns 8 through 14

-142.8647 124.2013 -89.3226 53.6971 -25.7088 9.8060 -2.5754

Column 15

0.4535

 

>> b

b =

Columns 1 through 7

0.6740 -3.6224 13.0613 -32.4097 64.0660 -100.8127 132.5758

Columns 8 through 14

-144.1567 132.5758 -100.8127 64.0660 -32.4097 13.0613 -3.6224

Column 15

0.6740

 

>> n

n =

7