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0=0
xx2[1]=addc(xx1[1],xx1[3]);
▶ 0+0=0
xx2[2]=mulc(subc(xx1[0],xx1[2]),W[0]);
▶ {0-0}×1=0
xx2[3]=mulc(subc(xx1[1],xx1[3]),W[2]);
▶ {0-0}×0.707=0
xx2[4]=addc(xx1[4],xx1[6]);
▶ 2000+0=2000
xx2[5]=addc(xx1[5],xx1[7]);
▶ 999.698-999.698 + 999.698+999.698 = 1999.396
xx2[6]=mulc(subc(xx1[4],xx1[6]),W[0])
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s:0.1;
f1=20;
f2=100;
f3=200;
X=cos(2*pi*f1*t)+cos(2*pi*f2*t)
+cos(2*pi*f3*t);
X_fft=fft(X,512);
t_fft=0:1/511:1;
plot(t_fft,abs(X_fft));
☆ mfile
==================================
clear all
fs=1000;
Ts=1/fs;
t=0:Ts:0.1;
f1=20;
f2=100;
f3=200;
X=square(2*pi*f1*t)
+square(2*pi*f2*t)
+square(2*pi*f3*t
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