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- clear; clc; clf; close, hold off;
- Am=1;
- Ac=1;
- fm=1500;
- fc=40000;
- prob=16;
- f1=1000;
- k=10;
- fp=prob*fc;
- N=fp/500;
- n=0:N-1;
- Tp=1/fp;
- t=n*Tp;
- f=n/Tp/N;
- ss=0.2*sin(2*pi*f1*t)+0.5*sin(2*pi*fm*t);
- m=ss/Am;
- s=Ac*cos(2*pi*fc*t).*(1+k.*m);
- znak=(sign(s)+1)/2;
- o=s.*znak;
- r=2*fm/fp;
- [B,A]=butter(6,r);
- y=filter(B,A,o);
- widmo=fft(o);
- wa=abs(widmo); ef=angle(widmo);
- subplot(512);plot(f,s);title('Sygnal zmodulowany');
- subplot(513);plot(f,o);title('Wyprostowany sygnal zmodulowany');
- subplot(514 );plot(n,y);title('Sygnal po demodulacji');
- subplot(511);plot(t,ss);title('Sygnal przed modulacja');
- subplot(515);stem(f,wa);title('Widmo wyprostowanego sygnalu zmodulowanego');
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