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Simulate a non linear system from input and output signals

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suniya vs
suniya vs 2023-8-22
回答： Ayush 2023-8-29
My system is non linear. There is some harmonics in the output signal. Using this code i cant replicate my output signal. Simulated signal does not contain harmonics. How can i change the code?
clear all;close all;clc;
[inpSig,fs]=audioread('varFsin_1K.wav');
[outSig, Fs] = audioread('AliELENvarFsin_1K261104b500_8_23.wav');
windowLength = 256;
win = hamming(windowLength,"periodic");
overlap = round(0.75 * windowLength);
ffTLength = windowLength;
Ts=1;
data = iddata(outSig,inpSig,Ts)
nx = 10;
sys = ssest(data,nx);
compare(data,sys)
dt = 1/Fs;
t=0:dt:(length(inpSig)*dt)-dt;
z=lsim(sys,inpSig,t)
spectrogram(z,win,overlap,ffTLength,Fs,'yaxis');

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回答（1 个）

Ayush
Ayush 2023-8-29
Hi @suniya vs
To replicate the harmonics in your output signal using the provided code, you can try the following steps:
  • Increase the model complexity:
nx = 15;
sys = ssest(data, nx);
  • Adjust the window length and overlap: Increasing the window length and reducing the overlap can provide a higher resolution spectrogram.
windowLength = 512; % Increase the window length
overlap = round(0.5 * windowLength); % Reduce the overlap
  • Adjust the spectrogram parameters: Increasing ffTLength can provide a higher frequency resolution.
ffTLength = 1024; % Increase the FFT length
You may read further from here:
Thanks,
Ayush Jaiswal

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