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replicaDetector.py
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replicaDetector.py
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import matplotlib.pyplot as plt
import numpy as np
import wave
from scipy import signal
import sys
import statistics
Fs = 44100
f = 1000
ampLow = 200
ampHigh = 6000
hours = 14
minutes = 0
spf = wave.open('data/oneminch1.wav','r')
#Extract Raw Audio from Wav File
wwvbSignal = spf.readframes(-1)
wwvbSignal = np.fromstring(wwvbSignal, 'Int16')
#5th Second (BPSK 0) (Working CC)
wwvbZero = wwvbSignal[182000:226100:1]
#3rd Second (BPSK 1)
#wwvbZeroB = wwvbSignal[93800:137900:1]
#34th Second (BPSK Unsure) (Working CC)
wwvbOne = wwvbSignal[1460026:1504126:1]
#1rst Second (BPSK 0) (Working CC)
wwvbX = wwvbSignal[4800:48900:1]
def createZero(Fs, f, ampHigh, ampLow):
second = []
for lowsample in range(0,8820):
second.append(ampLow * np.sin(2 * np.pi * f / Fs * lowsample))
for highsample in range(8820, 44100):
second.append(ampHigh * np.sin(2 * np.pi * f / Fs * highsample))
return second
def createOne(Fs, f, ampHigh, ampLow):
second = []
for lowsample in range(0,22050):
second.append(ampLow * np.sin(2 * np.pi * f / Fs * lowsample))
for highsample in range(22050, 44100):
second.append(ampHigh * np.sin(2 * np.pi * f / Fs * highsample))
return second
def createX(Fs, f, ampHigh, ampLow):
second = []
for lowsample in range(0,35280):
second.append(ampLow * np.sin(2 * np.pi * f / Fs * lowsample))
for highsample in range(35280, 44100):
second.append(ampHigh * np.sin(2 * np.pi * f / Fs * highsample))
return second
expectedZero = np.array(createZero(44100,1000, 6000, 200))
expectedOne = np.array(createOne(44100,1000, 6000, 200))
expectedX = np.array(createX(44100,1000, 6000, 200))
#Function that generatedd the expected signal
#Everything will remain Constant Exept for Hour and Minute
#Used to create One minute Expected Signals of AM during August 21, 2017
def expectedSignal(hoursS, minutesS, Zero, One, X):
wwvbExpected = []
wwvbExpected = wwvbExpected + X #0 Second
for min in minutesS:
if min == '0':
wwvbExpected = wwvbExpected + Zero
else:
wwvbExpected = wwvbExpected + One
wwvbExpected = wwvbExpected + X # 9 Second
wwvbExpected = wwvbExpected + Zero
wwvbExpected = wwvbExpected + Zero
for hour in hoursS:
if hour == '0':
wwvbExpected = wwvbExpected + Zero
else:
wwvbExpected = wwvbExpected + One
wwvbExpected = wwvbExpected + X #19 Second
wwvbExpected = wwvbExpected + Zero
wwvbExpected = wwvbExpected + Zero
#Day of the year 233 :22 - :33
wwvbExpected = wwvbExpected + One
wwvbExpected = wwvbExpected + Zero
wwvbExpected = wwvbExpected + Zero
wwvbExpected = wwvbExpected + Zero
wwvbExpected = wwvbExpected + Zero
wwvbExpected = wwvbExpected + One
wwvbExpected = wwvbExpected + One
wwvbExpected = wwvbExpected + X #29 Second
wwvbExpected = wwvbExpected + Zero
wwvbExpected = wwvbExpected + Zero
wwvbExpected = wwvbExpected + One
wwvbExpected = wwvbExpected + One
wwvbExpected = wwvbExpected + Zero
wwvbExpected = wwvbExpected + Zero
wwvbExpected = wwvbExpected + One #36
wwvbExpected = wwvbExpected + Zero
wwvbExpected = wwvbExpected + One
wwvbExpected = wwvbExpected + X #39 Second
wwvbExpected = wwvbExpected + Zero
wwvbExpected = wwvbExpected + Zero
wwvbExpected = wwvbExpected + One
wwvbExpected = wwvbExpected + One
wwvbExpected = wwvbExpected + Zero #44
wwvbExpected = wwvbExpected + Zero
wwvbExpected = wwvbExpected + Zero
wwvbExpected = wwvbExpected + Zero
wwvbExpected = wwvbExpected + One
wwvbExpected = wwvbExpected + X #49 Second
wwvbExpected = wwvbExpected + Zero
wwvbExpected = wwvbExpected + One
wwvbExpected = wwvbExpected + One
wwvbExpected = wwvbExpected + One
wwvbExpected = wwvbExpected + Zero #54
wwvbExpected = wwvbExpected + Zero
wwvbExpected = wwvbExpected + Zero
wwvbExpected = wwvbExpected + One
wwvbExpected = wwvbExpected + One
wwvbExpected = wwvbExpected + X #59 Second
return wwvbExpected
def getMinutes(minutes):
new = ""
if minutes >= 40:
new = new + '1'
minutes = minutes - 40
else:
new = new + '0'
if minutes >= 20:
new = new + '1'
minutes = minutes - 20
else:
new = new + '0'
if minutes >= 10:
new = new + '1'
minutes = minutes - 10
else:
new = new + '0'
new = new + '0'
if minutes >= 8:
new = new + '1'
minutes = minutes - 8
else:
new = new + '0'
if minutes >= 4:
new = new + '1'
minutes = minutes - 4
else:
new = new + '0'
if minutes >= 2:
new = new + '1'
minutes = minutes - 2
else:
new = new + '0'
if minutes >= 1:
new = new + '1'
minutes = minutes - 11
else:
new = new + '0'
return new
def getHours(hours):
new = ""
if hours >= 20:
new = new + '1'
hours = hours - 20
else:
new = new + '0'
if hours >= 10:
new = new + '1'
hours = hours - 10
else:
new = new + '0'
new = new + '0'
if hours >= 8:
new = new + '1'
hours = hours - 8
else:
new = new + '0'
if hours >= 4:
new = new + '1'
hours = hours - 4
else:
new = new + '0'
if hours >= 2:
new = new + '1'
hours = hours - 2
else:
new = new + '0'
if hours >= 1:
new = new + '1'
hours = hours - 1
else:
new = new + '0'
return new
Zero = createZero(Fs, f, ampHigh, ampLow)
One = createOne(Fs, f, ampHigh, ampLow)
X = createX(Fs, f, ampHigh, ampLow)
minutesS = getMinutes(minutes)
hoursS = getHours(hours)
newSignal = expectedSignal(hoursS, minutesS, Zero, One, X)
#Checks to make sure that wwvbSignal and newSignal are same length
while len(wwvbSignal) > len(newSignal):
newSignal.append(0)
nS = np.array(newSignal)
bitStream = []
templates = [Zero, One, X]
thresholds = [500000000000, 300000000000]
values = ['0', '1', 'X']
#corrects for wwvb offset
print(len(wwvbSignal))
#temp = wwvbSignal[0:4800:1]
wwvbSignal = wwvbSignal[5500::]
wwvbSignal = np.array(wwvbSignal)
#temp = np.array(temp)
#wwvbSignal = np.concatenate((wwvbSignal, temp))
print(len(wwvbSignal))
#One min wwvb
bitStream = ""
devList = []
for i in range(59):
start = i *44100
end = (i*44100) + 44100
corrZero = signal.correlate(wwvbSignal[start:end], Zero, mode='full')
corrOne = signal.correlate(wwvbSignal[start:end], One, mode='full')
corrX = signal.correlate(wwvbSignal[start:end], X, mode='full')
numZero = int(max(corrZero[44078:44123:1]) / 1000000000)
numOne = int(max(corrOne[44078:44123:1]) / 1000000000)
numX = int(max(corrX[44078:44123:1]) / 1000000000)
if numOne > (numX *2): # we have one or zero
if numZero > (numOne + (numX * 0.8)):
bitStream = bitStream + '0'
else:
bitStream = bitStream + '1'
else:
bitStream = bitStream + 'X'
devList.append(numZero)
devList.append(numOne)
devList.append(numX)
devList.append("||")
print(devList)
print(bitStream)
'''
#print(bitStream)
plt.figure(1)
plt.title('Expected Signal with AM Modulation (14:00 UTC)')
plt.ylim((-10000, 10000))
plt.xlabel("Sample Rate = 44100Hz | (60 Seconds)")
plt.plot(wwvbSignal)
plt.show()
'''