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https://github.com/romanz/amodem.git
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60 lines
1.4 KiB
Python
Executable File
60 lines
1.4 KiB
Python
Executable File
#!/usr/bin/env python
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import numpy as np
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import time
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import logging
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import itertools
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log = logging.getLogger(__name__)
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import sigproc
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import train
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from common import *
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class Symbol(object):
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t = np.arange(0, Nsym) * Ts
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carrier = [ np.exp(2j * np.pi * F * t) for F in frequencies ]
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sym = Symbol()
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data = open('data.send', 'r').read()
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def write(fd, sym, n=1):
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fd.write(dumps(sym, n))
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def start(sig, c):
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write(sig, c*0, n=50)
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write(sig, c*1, n=400)
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write(sig, c*0, n=50)
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def training(sig, c):
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for b in train.equalizer:
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write(sig, c * b)
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def modulate(sig, bits):
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symbols_iter = sigproc.modulator.encode(list(bits))
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symbols_iter = itertools.chain(symbols_iter, itertools.repeat(0))
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carriers = np.array(sym.carrier) / len(sym.carrier)
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while True:
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symbols = itertools.islice(symbols_iter, len(sym.carrier))
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symbols = np.array(list(symbols))
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write(sig, np.dot(symbols, carriers))
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if all(symbols == 0):
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break
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def main():
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import ecc
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log.info('Running MODEM @ {:.1f} kbps'.format(sigproc.modem_bps / 1e3))
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with open('tx.int16', 'wb') as fd:
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start(fd, sym.carrier[carrier_index])
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for c in sym.carrier:
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training(fd, c)
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bits = to_bits(ecc.encode(data))
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modulate(fd, bits)
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if __name__ == '__main__':
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logging.basicConfig(level=logging.DEBUG, format='%(message)s')
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main()
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