from __future__ import division
from time import sleep, time
import matplotlib
import pylab
import numpy as np
import pyback
from covert_fsk import Covert, show_sig
cc = Covert(bit_rate=100., f0=600., f1=900., spl_rate=50000)
while True:
S = pyback.measure(1 * 1000 * 1000, 50000)
S_ = cc.bandpass(S)
B = cc.demod(S_)
pkts = cc.decode(B)
pylab.figure(1);
pylab.subplot(2,1,1); show_sig(S, 5*20*4)
pylab.subplot(2,1,2); show_sig(B, 5*20*4)
pylab.draw()
print 78*"-"
for p in pkts:
if len(p) == len(cc.test_pkt):
print "%1.4f: %s" % (np.mean(np.abs(p - cc.test_pkt)), p)
#!/usr/bin/env python
import numpy as np
import pylab
import pyback
def show_sig(S, rowsize=120):
rows = int(S.size // rowsize)
N = rows * rowsize
S = S[0:N].reshape( (rows, rowsize) )
pylab.imshow(S, interpolation="nearest")
M = 1000*1000
usec = 1*M
rate = 20000
blk_size = 64*1024
while True:
bw = pyback.measure(usec, rate, blk_size)
show_sig(bw, rate/100)
pylab.draw()