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afilter.py
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'''
Some calcs for analog filters.
'''
import all_pass
def rc_f(r, c):
'''
Calculate the cutoff frequency of a simple
RC filter.
r = resistance (ohms)
c = capacitance (F)
'''
from math import pi
return 1.0/(2.0*pi*r*c)
def rc_r(f, c):
'''
Calulate the resistance required for a
simple RC filter.
f = cutoff frequency (Hz)
c = capacitance (F)
'''
from math import pi
return 1.0/(2.0*pi*f*c)
def rc_c(f, r):
'''
Calulate the resistance required for a
simple RC filter.
f = cutoff frequency (Hz)
r = resistance (ohms)
'''
from math import pi
return 1.0/(2.0*pi*f*r)
def lc_f(l, c):
'''
Calulate the cutoff frequency of a simple
LC filter.
l = inductance (H)
c = capacitance (F)
'''
from math import pi, sqrt
return 1.0/(2.0*pi*sqrt(l*c))
def lc_l(f, c):
'''
Calulate the inductance required for a
simple LC filter.
f = cutoff frequency (Hz)
c = capacitance (F)
'''
from math import pi
w = 2.0*pi*f
return 1.0/(w**2*c)
def lc_c(f, l):
'''
Calulate the capacitance required for a
simple LC filter.
f = cutoff frequency (Hz)
l = inductance (H)
'''
from math import pi
w = 2.0*pi*f
return 1.0/(w**2*l)