def create_butter_lp_filter_Wn_05_N_3(name, dt, size):
lp_filter = FilterDifferentiator(name)
# (b,a) = butter(N=3, Wn=0.05)
# delay about 13*dt
lp_filter.init(dt, size, (0.00041655, 0.00124964, 0.00124964, 0.00041655),
(1., -2.6861574, 2.41965511, -0.73016535))
return lp_filter
def create_chebi2_lp_filter_Wn_03_N_4(name, dt, size):
lp_filter = FilterDifferentiator(name);
# (b,a) = cheby2(4, 20, 0.03)
# delay about 23*dt
lp_filter.init(dt, size, (0.09147425, -0.35947268, 0.53605377, -0.35947268, 0.09147425),
( 1. , -3.7862251 , 5.38178322, -3.40348456, 0.80798333));
return lp_filter;
def create_butter_lp_filter_Wn_03_N_4(name, dt, size):
lp_filter = FilterDifferentiator(name);
# (b,a) = butter(N=4, Wn=0.03)
# delay about 28*dt
lp_filter.init(dt, size, (4.37268880e-06, 1.74907552e-05, 2.62361328e-05, 1.74907552e-05, 4.37268880e-06),
(1., -3.75376276, 5.29115258, -3.3189386 , 0.78161874));
return lp_filter;
def create_butter_lp_filter_Wn_05_N_2(name, dt, size):
lp_filter = FilterDifferentiator(name);
# from scipy.signal import butter
# (b,a) = butter(N=2, Wn=0.05)
# delay about 9*dt
lp_filter.init(dt, size, (0.00554272, 0.01108543, 0.00554272), (1., -1.77863178, 0.80080265));
return lp_filter;
def create_butter_lp_filter_Wn_05_N_4(name, dt, size):
lp_filter = FilterDifferentiator(name);
# (b,a) = butter(N=4, Wn=0.05)
# delay about 16*dt
lp_filter.init(dt, size, (3.12389769e-05, 1.24955908e-04, 1.87433862e-04, 1.24955908e-04, 3.12389769e-05),
(1., -3.58973389, 4.85127588, -2.92405266, 0.66301048));
return lp_filter;
def create_butter_lp_filter_Wn_03_N_3(name, dt, size):
lp_filter = FilterDifferentiator(name)
# (b,a) = butter(N=3, Wn=0.03)
# delay about 20*dt
lp_filter.init(
dt, size,
(9.54425084e-05, 2.86327525e-04, 2.86327525e-04, 9.54425084e-05),
(1., -2.81157368, 2.64048349, -0.82814628))
return lp_filter
def create_chebi1_checby2_series_filter(name, dt, size):
#b1,a1=cheby2(2, 20,0.05);
#b2,a2 = cheby1(4,0.05,0.08);
#(b,a) = filter_series(b1,a1,b2,a2);
lp_filter = FilterDifferentiator(name);
lp_filter.init(dt, size,
(2.16439898e-05, 4.43473520e-05, -1.74065002e-05,
-8.02197247e-05, -1.74065002e-05, 4.43473520e-05, 2.16439898e-05),
(1.,-5.32595322,11.89749109,-14.26803139, 9.68705647, -3.52968633, 0.53914042))
return lp_filter;