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Copy pathEderwanderVocoderOnTheFly.py
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EderwanderVocoderOnTheFly.py
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#Eng Eder de Souza - ederwander
from numpy import pi, mod, sin, sqrt, tan, frombuffer, float32, linspace, finfo, clip
from scipy.signal import lfilter, sawtooth
from struct import pack
import pyaudio
'''33 frequencies -> Bandpass filter design coefficients'''
a = [
[1, -3.99975599432850, 5.99927319549360, -3.99927840737790, 0.999761206219333],
[1, -3.99969087479883, 5.99908089886356, -3.99908917207623, 0.999699148027989],
[1 -3.99960783242349, 5.99883663242320, -3.99884976505012, 0.999620965091944],
[1, -3.99950162319079, 5.99852572084418, -3.99854656702148, 0.999522469472722],
[1, -3.99936529624421, 5.99812898911301, -3.99816207919623, 0.999398386591067],
[1, -3.99918954838096, 5.99762119086212, -3.99767371571456, 0.999242073897684],
[1, -3.99896179230423, 5.99696879242825, -3.99705216552381, 0.999045167073510],
[1, -3.99866479474709, 5.99612680715249, -3.99625914349455, 0.998797135306096],
[1, -3.99827466248870, 5.99503421446511, -3.99524426396985, 0.998484722617774],
[1, -3.99775783209982, 5.99360724998732, -3.99394063771490, 0.998091246593493],
[1, -3.99706652768996, 5.99172946648071, -3.99225859033826, 0.997595718976056],
[1, -3.99613185013489, 5.98923686336783, -3.99007658764110, 0.996971744260045],
[1, -3.99485318855908, 5.98589544431097, -3.98722797037749, 0.996186142439803],
[1, -3.99308190186349, 5.98136710272466, -3.98348135377444, 0.995197230334171],
[1, -3.99059605102152, 5.97515747320379, -3.97851139167541, 0.993952682453192],
[1, -3.98706113267000, 5.96653590681851, -3.97185482190872, 0.992386877515924],
[1, -3.98196890312390, 5.95441243992289, -3.96284396965905, 0.990417621333426],
[1, -3.97454193106546, 5.93714875785070, -3.95050570870629, 0.987942122629232],
[1, -3.96358465094425, 5.91226887379876, -3.93340759291814, 0.984832088850899],
[1, -3.94725123836206, 5.87602016123001, -3.90942359895478, 0.980927810114349],
[1, -3.92268507313800, 5.82271809701412, -3.87537871287358, 0.976031121355393],
[1, -3.88546228104775, 5.74379634972886, -3.82651390292709, 0.969897192591698],
[1, -3.82874219179635, 5.62650200982447, -3.75569214621489, 0.962225222699710],
[1, -3.74199398552012, 5.45228903999113, -3.65224899613469, 0.952648347632671],
[1, -3.60914741639923, 5.19532970510166, -3.50039918643988, 0.940723488871680],
[1, -3.40605615180314, 4.82253055457138, -3.27720061176920, 0.925922567908390],
[1, -3.09739763001925, 4.29865336456317, -2.95038375754678, 0.907627654519980],
[1, -2.63388305596713, 3.60440511182782, -2.47717214208704, 0.885134424906144],
[1, -1.95260897719969, 2.78102389972874, -1.80711132908444, 0.857671089645940],
[1, -0.987821704356849, 2.01302475585146, -0.895725041038555, 0.824444128755633],
[1, 0.292204692740340, 1.71579119867574, 0.258147856757345, 0.784728343490888],
[1, 1.79567000881120, 2.42888468072076, 1.53417945578454, 0.738028006232103],
[1, 3.14391651047433, 4.05911136375890, 2.57181632513949, 0.684351098394969]
]
b = [
[1.71790337413308e-08, 0, -3.43580674826616e-08, 0, 1.71790337413308e-08],
[2.72392949892633e-08, 0, -5.44785899785266e-08, 0, 2.72392949892633e-08],
[4.33202037600520e-08, 0, -8.66404075201039e-08, 0, 4.33202037600520e-08],
[6.87019970842440e-08, 0, -1.37403994168488e-07, 0, 6.87019970842440e-08],
[1.09076437679077e-07, 0, -2.18152875358153e-07, 0, 1.09076437679077e-07],
[1.73127013142121e-07, 0, -3.46254026284243e-07, 0, 1.73127013142121e-07],
[2.74802658915039e-07, 0, -5.49605317830078e-07, 0, 2.74802658915039e-07],
[4.36167681516868e-07, 0, -8.72335363033737e-07, 0, 4.36167681516868e-07],
[6.92263017611530e-07, 0, -1.38452603522306e-06, 0, 6.92263017611530e-07],
[1.09868242572049e-06, 0, -2.19736485144099e-06, 0, 1.09868242572049e-06],
[1.74361621177647e-06, 0, -3.48723242355294e-06, 0, 1.74361621177647e-06],
[2.76695320840727e-06, 0, -5.53390641681454e-06, 0, 2.76695320840727e-06],
[4.39053611412317e-06, 0, -8.78107222824634e-06, 0, 4.39053611412317e-06],
[6.96608739369304e-06, 0, -1.39321747873861e-05, 0, 6.96608739369304e-06],
[1.10510729592236e-05, 0, -2.21021459184473e-05, 0, 1.10510729592236e-05],
[1.75286996737880e-05, 0, -3.50573993475760e-05, 0, 1.75286996737880e-05],
[2.77975505699513e-05, 0, -5.55951011399026e-05, 0, 2.77975505699513e-05],
[4.40709217599428e-05, 0, -8.81418435198856e-05, 0, 4.40709217599428e-05],
[6.98486316325863e-05, 0, -0.000139697263265173, 0, 6.98486316325863e-05],
[0.000110659311323076, 0, -0.000221318622646152, 0, 0.000110659311323076],
[0.000175225540477838, 0, -0.000350451080955677, 0, 0.000175225540477838],
[0.000277287390711482, 0, -0.000554574781422964, 0, 0.000277287390711482],
[0.000438446036225742, 0, -0.000876892072451484, 0, 0.000438446036225742],
[0.000692577807844958, 0, -0.00138515561568992, 0, 0.000692577807844958],
[0.00109264697016785, 0, -0.00218529394033570, 0, 0.00109264697016785],
[0.00172114638070978, 0, -0.00344229276141955, 0, 0.00172114638070978],
[0.00270595858002333, 0, -0.00541191716004666, 0, 0.00270595858002333],
[0.00424419670029157, 0, -0.00848839340058314, 0, 0.00424419670029157],
[0.00663759117688310, 0, -0.0132751823537662, 0, 0.00663759117688310],
[0.0103442686624309, 0, -0.0206885373248617, 0, 0.0103442686624309],
[0.0160534029877771, 0, -0.0321068059755541, 0, 0.0160534029877771],
[0.0247915230726592, 0, -0.0495830461453185, 0, 0.0247915230726592],
[0.0380733762023088, 0, -0.0761467524046175, 0, 0.0380733762023088]
]
r = 0.99
lowpassf = [1.0, -2.0*r, +r*r]
d = 0.41004238851988095
#you can change f0 to new frequency hertz
f0=320
amp=1.0
Fs=22000
w=2.0*pi*f0/Fs
dB=10**(40/20)
chunk=4096
phase0=0
phase1=0
phase2=0
phase3=0
phase4=0
phase5=0
phase6=0
phase7=0
def carrier(s):
global phase0
global phase1
global phase2
global phase3
global phase4
global phase5
global phase6
global phase7
#make It always continuos :-)
'''
phase0=w*(linspace(0, s, s))+phase0
carriersignal= (amp*sawtooth(phase0))
phase0 = mod(phase0[s-1], 2.0*pi);
'''
phase1=0.2 * w * (linspace(0, s, s)) + phase1
phase2=0.4 * w * (linspace(0, s, s)) + phase2
phase3=0.5 * w * (linspace(0, s, s)) + phase3
phase4=2.0 * w * (linspace(0, s, s)) + phase4
phase5=sin(phase1) - tan(phase3)
phase6=sin(phase1) + sin(phase4)
phase7=sin(phase2) - sin(phase4)
x = sin(phase5)
y = sin(phase6)
z = sin(phase7)
carriersignal = 0.25 * (x + y + z + d)
phase1 = mod(phase1[s-1], 2.0*pi)
phase2 = mod(phase2[s-1], 2.0*pi)
phase3 = mod(phase3[s-1], 2.0*pi)
phase4 = mod(phase4[s-1], 2.0*pi)
phase5 = mod(phase5[s-1], 2.0*pi)
phase6 = mod(phase6[s-1], 2.0*pi)
phase7 = mod(phase7[s-1], 2.0*pi)
#'''
return carriersignal
def vocoder(sig):
N=len(sig)
carriersignal=0
carriersignal=carrier(N)
vout=0
for i in range(0, 33):
bandpasscarrier = lfilter(b[i], a[i], carriersignal)
bandpassmodulator = lfilter(b[i], a[i], sig)
rectifiedmodulator = abs(bandpassmodulator*bandpassmodulator)/N
envelopemodulator = sqrt(lfilter([1.0], lowpassf, rectifiedmodulator))
vout+= bandpasscarrier*envelopemodulator
vout = clip(vout*dB, -1, 1)
return vout
# Initialize PyAudio
pyaud = pyaudio.PyAudio()
# Open stream
stream = pyaud.open(format = pyaudio.paFloat32,
channels = 1,
rate = Fs,
input = True,
output = True)
print("listening...")
while True:
rawsamps = stream.read(chunk, exception_on_overflow=False)
samps = frombuffer(rawsamps, dtype=float32)
samps2=vocoder(samps)
out = pack("%df"%len(samps2), *samps2)
stream.write(out)
stream.close()
pyaud.terminate()