Baseline Drift Removal

[Scott L. Dias]

Hello DWT Family!

 

I have extracted certain coefficients using db4 up to level 8. I want to remove baseline drift noise from my signal where the cA8 coefficient has the frequency of baseline drift when I remove it from the original or reconstructed signal and plot my signal it is not showing me the desired result.

baseline = np.subtract(waverec, cA8)

When I subtract the cA8 coefficient from the original signal plot the result it doesn't remove the noise from my signal and also it makes a reciprocal of my graph below is the graph/