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i need to use ifft on this (help plz im desperate)

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zayaz aya
zayaz aya 2018-4-3
关闭： MATLAB Answer Bot 2021-8-20
Fs = 1000;
T = 1/Fs;
t = (0:L-1)*T;
y1=110*sin(2*pi*50*t);
y2=10*sin(2*pi*250*t);
z=y1+y2;
f = Fs*(0:(L/2))/L;
z=abs(fft(z));
grid
plot(z)
figure(1);
semilogx(f,z(1:numel(f)))
d = designfilt('bandstopiir','FilterOrder',2, ...
'HalfPowerFrequency1',49,'HalfPowerFrequency2',51, ...
'DesignMethod','butter','SampleRate',Fs);
fvtool(d,'Fs',Fs)
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Adam
Adam 2018-4-3
编辑：Adam 2018-4-3
So what is wrong exactly with using
doc ifft
just like you used fft?
zayaz aya
zayaz aya 2018-4-3
the thing is i dont know what im doing i tried ifft and its not working ifft should make everything back to where it was i think

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