82 lines
1.3 KiB
Python
82 lines
1.3 KiB
Python
import numpy as np
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import scipy.signal as sig
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from .util import *
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from .planes import s2z
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# PEP 8 fucking destroyed this file. I'm sorry.
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def bq_run(bq, xs):
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return sig.lfilter(*bq, x=xs, axis=0)
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def nfba(b, a):
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return (1/tau, (b, a), 0)
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def nf(t, f, g, bw, mg):
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return (f, t(toA(g), toQ(bw)), mg)
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def LP1(A, Q):
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return ((0, 1), (1, 1))
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def HP1(A, Q):
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return ((1, 0), (1, 1))
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def LS1(A, Q):
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return ((1, A), (1, 1/A))
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def HS1(A, Q):
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return ((A, 1), (1/A, 1))
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# patterns observed, in case some simplification could be done:
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# a always gets divided by A instead of multiplied
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# b1 and a1 always /= Q
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def LP2(A, Q):
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return ((0, 0, 1), (1, 1/Q, 1))
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def HP2(A, Q):
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return ((1, 0, 0), (1, 1/Q, 1))
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def PE2(A, Q):
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return ((1, A/Q, 1), (1, 1/A/Q, 1))
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def AP2(A, Q):
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return ((1, -1/Q, 1), (1, 1/Q, 1))
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def BP2a(A, Q):
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return ((0, -A/Q, 0), (1, 1/A/Q, 1))
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def BP2b(A, Q):
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return ((0, -A*A/Q, 0), (1, 1/Q, 1))
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def NO2(A, Q):
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return ((1, 0, 1), (1, 1/Q, 1))
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def LS2(A, Q):
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return ((1, np.sqrt(A)/Q, A), (1, 1/np.sqrt(A)/Q, 1/A))
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def HS2(A, Q):
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return ((A, np.sqrt(A)/Q, 1), (1/A, 1/np.sqrt(A)/Q, 1))
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def gen_filters(cascade, srate):
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return [
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s2z(*f[1], fc=f[0], srate=srate, gain=10**(f[2]/20)) for f in cascade
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]
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