How can i decompose my signal into five parts using daubechies wavelet(db4) ?

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Aparna Gupta
Aparna Gupta 2017-7-20
I have an EEG signal which i had implemented in matlab and then added noise to it. Now i need to filter the noise out using wavelet transform. Can any one please help me ? This is my code:
  1. fs = 512
  2. T = 1/fs;
  3. N =length(EEGsig); ls = size(EEGsig);
  4. tx =[0:length(EEGsig)-1]/fs;
  5. fx = fs*(0:N/2-1)/N;
  6. x= EEGsig;
  7. sd = 0.1;
  8. normal_noise = sd*randn(1, N);
  9. noisy_EEGsig = x + normal_noise;
  10. figure();
  11. subplot(4,1,1);
  12. grid on;
  14. plot(tx, x);
  15. xlabel('Time [s]');
  16. ylabel('Amplitude');
  17. title('Original signal');
  18. subplot(4,1,2);
  19. grid on;
  20. plot(tx,normal_noise);
  21. xlabel('Time [s]');
  22. ylabel('Amplitude');
  23. title('Noise');
  24. subplot(4,1,3);
  25. grid on;
  26. plot(tx, noisy_EEGsig);
  27. xlabel('Time [s]');
  28. ylabel('Amplitude');
  29. title('Original signal + Noise');

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