semnale sinus
DESCRIPTION
sTRANSCRIPT
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Tema la sinus
1)Sa se genereze un semnal sinusoidal pe 3 perioade ,
1000 de puncte pe perioada si sa se adune acestuia o
component armonica a 5-a avand amplitudinea 10% din
semnalul fundamental.Sa se calculeze valoarea medie a
semnalului.n=3000;i=1:3000;
s=sin(6*pi/n*i);
s1=0.1*sin(6*pi/(n*5)*i);
f=s+s1;
vmed=sum(f)/n
sum(s)/n
plot(i,f)
Vmed=0.040
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3)Sa se genereze 3 perioade de semnal triung!iular
avand zgomot de 5%.Sa se calculeze valoarea medie a
semnalului si sa se reprezinte grap!ic variatia acestei
valori in functie de numarul "=300,#00,$00,100,1500.N=[300 600 00 1!00 1500";
fo# $=1:len%t&(N)
n=N($)
fi=1:n;
fo# i=1:n/6
t#(i)=i;
end
fo# i=n/6:n/3
t#(i)='i+n/3;
end
fo# i=n/3:3*n/6
t#(i)=i'n/3;
end
fo# i=3*n/6:!*n/3
t#(i)='i+!*n/3;
end
fo# i=!*n/3:5*n/6
t#(i)=i'!*n/3;
end
fo# i=5*n/6:n
t#(i)='i+n;
end fo# i=1:n
s(i)=n/10*sin(6*pi/n*i);
end
m=m(s);
fo# i=1:n
if s(i)0
t#(i)=t#(i)+#nd*m/5;
else
t#(i)=t#(i)+#nd*m/5;
end
end
vmed($)=sum(t#)/n
end
plot(fi,t#)
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vmed =& .45 54.$$$ 4.0143 113.001
140.541'
4)Sa se traseze cur(ele de eroare pentru valoarea mediesi valoarea efectiva ale unui semnal sinusoidal avand un
zgomot de 5% din amplitudine pentru un numar de
esantioane
"=10,0,40,0,1#0,30,#40,10,5#0,510,1040.
n=[10 !0 0 0 160 3!0 60 1!0 !560 51!0 10!0";
fo# $=1:len%t&(n) m=n($);
fi=1:m;
fo# i=1:m
s(i)=sin(!*pi/m*i)+0.05*#nd;
end
umin=min(s);
um=m(s);
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umed($)=sum(s)/m;
uef($)=(um'umin)/!;
end
=1:len%t&(n);
fi%u#e;
su-plot(!,1,1)
plot(,umed);
su-plot(!,1,!)
plot(,uef);
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