Created
July 13, 2020 18:15
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# filter some data using SOS so as to preserve the dynamic range | |
import numpy as np | |
import scipy.signal as sig | |
fs = 1024 | |
bg_raw = np.random.randn(1000) | |
# This is a bandpass | |
f1 = 15 | |
f2 = 100 | |
sosBP1 = sig.butter(8, [f1/(fs/2), f2/(fs/2)], btype='bandpass', output='sos') | |
# invertable band pass | |
fz = [4, 400] | |
fp = [15, 20, 150] | |
_,z0,_ = sig.butter(10, fz[0]/(fs/2), btype='lowpass', output='zpk') | |
_,p0,_ = sig.butter( 8, fp[0]/(fs/2), btype='lowpass', output='zpk') | |
_,p1,_ = sig.butter( 1, fp[1]/(fs/2), btype='lowpass', output='zpk') | |
_,p2,_ = sig.butter( 3, fp[1]/(fs/2), btype='lowpass', output='zpk') | |
_,z1,_ = sig.butter( 2, fz[1]/(fs/2), btype='lowpass', output='zpk') | |
zs = np.concatenate((z0, z1)) | |
ps = np.concatenate((p0, p1)) | |
BP = sig.zpk2sos(zs, ps, 1, pairing='keep_odd') | |
sosBP = np.concatenate([sosBP1, BP], axis = 0) | |
# filter the data using many second-order-sections | |
bg = sig.sosfilt(sosBP, bg_raw) |
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