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MMDVM
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Move helper script to separate folder

This commit is contained in:
Geoffrey Merck 2020-04-29 20:41:41 +02:00
parent 626a280d27
commit da87afc8d4
1 changed files with 7 additions and 6 deletions
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13
FMGenerateFilterCoefficients.py → Tools/FMGenerateFilterCoefficients.py
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@ -17,21 +17,22 @@ f2 = 2700
rp = 0.2 rp = 0.2
# scaling factor in bits, do not change ! # scaling factor in bits, do not change !
q = 15 q = 0
# scaling factor as facor... # scaling factor as facor...
scaling_factor = 2**q scaling_factor = 2**q
# let's generate a sequence of 2nd order IIR filters # let's generate a sequence of 2nd order IIR filters
#sos = signal.butter(2,[f1/fs*2,f2/fs*2],'pass',output='sos') #sos = signal.cheby1(3,rp,[f1, f2],'bandpass', output='sos', fs=fs)
sos = signal.cheby1(3,rp,[f1/fs*2,f2/fs*2],'bandpass', output='sos') #sos = signal.cheby1(1, rp, 2122, 'lowpass', output='sos', fs=fs) #deemphasis filter
sos = signal.cheby1(1, rp, 2122, 'highpass', output='sos', fs=fs) #deemphasis filter
sos = np.round((sos) * scaling_factor) #sos = np.round((sos) * scaling_factor)
# print coefficients # print coefficients
for biquad in sos: for biquad in sos:
for coeff in biquad: for coeff in biquad:
print(int(coeff),",",sep="",end="") #print(int(coeff),",",sep="",end="")
#print((coeff),",",sep="",end="") print((coeff),",",sep="",end="")
print("") print("")
# plot the frequency response # plot the frequency response