a1=1;
a2=0.9;
a3=0.01;

N=100;
fs=1;
f1=5.5/N;
f2=6.5/N;
f3=10.5/N;
freq=((0:(N-1))*fs)/(N);

t = (0:N-1) / fs;

x = a1*cos(2*pi*f1*t)+a2*cos(2*pi*f2*t)+a3*cos(2*pi*f3*t);
dx1=cos(2*pi*f1*t)+0.9*cos(2*pi*f2*t)+0.01*cos(2*pi*f3*t);
dx2=cos(2*pi*f1*t)+0.9*cos(2*pi*f2*t)+0.01*cos(2*pi*f3*t);


%X = fft(x.*bartlett(length(N)));
DX11=abs(fft((dx1.*rectwin(N)')));
figure(1)
plot(freq,20*log(abs(DX11)));
title('WYKRES rectwin - 1d')

DX12=abs(fft((dx1.*bartlett(N)')));
figure(2)
plot(freq,20*log(abs(DX12)));
title('WYKRES bartlett - 1d')


DX13=abs(fft((dx1.*hamming(N)')));
figure(3)
plot(freq,20*log(abs(DX13)));
title('WYKRES hamming - 1d')


DX14=abs(fft((dx1.*hanning(N)')));
figure(4)
plot(freq,20*log(abs(DX14)));
title('WYKRES RECTWIN - 1d')


DX15=abs(fft((dx1.*blackman(N)')));
figure(5)
plot(freq,20*log(abs(DX15)));
title('WYKRES blackman - 1d')