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impulseResponse=fftshift(fft(lsim(transferFunction,impulse,t))); This is kinda strange. Impulse response is a time-domain sequence, lsim(transferFunction,impulse,t) already gives you that and you don't need to do a FFT. You can also get IR using impz(numerator, denominator) if you know the numerator and denominator. On the contrary, to estimate the ...

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