def demodulate(self, samples):
if self.demodtype == "envelope":
demod_samples = demodulate.envelope(samples, self.fc, self.config)
elif self.demodtype == "het":
demod_samples = demodulate.heterodyne(samples, self.fc, self.config)
elif self.demodtype == "quad":
demod_samples = demodulate.quadrature(samples, self.fc, self.config)
else:
print 'Unsupported demodulation scheme'
sys.exit(1)
if self.filtertype == "avg":
return demodulate.avgfilter(demod_samples, self.fc, self.config)
elif self.filtertype == "sinc":
return demodulate.lpfilter(demod_samples, self.fc, self.config)
else:
print 'Unsupported filter: %s' % self.filtertype
sys.exit(1)
try:
samples_rx = channel.xmit_and_recv(mod_samples)
except ZeroDivisionError:
# should only happen for audio channel
print "I didn't get any samples; is your microphone or speaker OFF?"
print "Please turn them on!"
sys.exit(1)
if opt.demod == 'quad':
plot_sig_spectrum(numpy.real(samples_rx), 'modulated samples')
p.show()
demod = demodulate.quadrature(samples_rx, opt.channel[0], opt)
if opt.filter == 'sinc':
plot_sig_spectrum(numpy.real(demod), 'demodulated samples')
else:
filtered = demodulate.avgfilter(demod, opt.channel[0], opt)
plot_sig_spectrum(numpy.real(filtered), 'demodulated samples filtered by averaging')
p.show()
# process the received samples
for fc in channels:
# make receiver
#r = ReceiverClass(opt.ktype, fc, opt.changap, opt.samplerate, opt.spb, opt.demod, preamble)
r = ReceiverClass(opt, fc, preamble)
rcdbits, softinfo, snr, demod_samples, hist_samples, offset = r.recv(samples_rx)
# push into sink
sink = Sink(r, opt.header, src[fc].srctype)
if opt.fname is not None:
rcd_payload = sink.process(rcdbits, softinfo, src[fc].fname)
else:
rcd_payload = sink.process(rcdbits, softinfo)
try:
samples_rx = channel.xmit_and_recv(mod_samples)
except ZeroDivisionError:
# should only happen for audio channel
print "I didn't get any samples; is your microphone or speaker OFF?"
print "Please turn them on!"
sys.exit(1)
if opt.demod == 'quad':
plot_sig_spectrum(numpy.real(samples_rx), 'modulated samples')
p.show()
demod = demodulate.quadrature(samples_rx, opt.channel[0], opt)
if opt.filter == 'sinc':
plot_sig_spectrum(numpy.real(demod), 'demodulated samples')
else:
filtered = demodulate.avgfilter(demod, opt.channel[0], opt)
plot_sig_spectrum(numpy.real(filtered),
'demodulated samples filtered by averaging')
p.show()
# process the received samples
for fc in channels:
# make receiver
#r = ReceiverClass(opt.ktype, fc, opt.changap, opt.samplerate, opt.spb, opt.demod, preamble)
r = ReceiverClass(opt, fc, preamble)
rcdbits, softinfo, snr, demod_samples, hist_samples, offset = r.recv(
samples_rx)
# push into sink
sink = Sink(r, opt.header, src[fc].srctype)
if opt.fname is not None:
rcd_payload = sink.process(rcdbits, softinfo, src[fc].fname)
else: