code: def encode(binary_data):
  	'''
  	Encode binary data using Bell-202 AFSK
  	
  	Expects a bitarray.bitarray() object of binary data as its argument.
  	Returns a generator of sound samples suitable for use with the 
  	audiogen module.
  	'''
  	framed_data = frame(binary_data)
  
  	# set volume to 1/2, preceed packet with 1/20 s silence to allow for startup glitches
  	for sample in itertools.chain(
  		audiogen.silence(1.05), 
  		multiply(modulate(framed_data), constant(0.5)), 
  		audiogen.silence(1.05), 
  	):
  		yield samplf encode(binary_data):
  	'''
  	Encode binary data using Bell-202 AFSK
  	
  	Expects a bitarray.bitarray() object of binary data as its argument.
  	Returns a generator of sound samples suitable for use with the 
  	audiogen module.
  	'''
  	framed_data = frame(binary_data)
  
  	# set volume to 1/2, preceed packet with 1/20 s silence to allow for startup glitches
  	for sample in itertools.chain(
  		audiogen.silence(1.05), 
  		multiply(modulate(framed_data), constant(0.5)), 
  		audiogen.silence(1.05), 
  	):
  		yield sample
docs: Encode binary data using Bell-202 AFSK
  	
  	Expects a bitarray.bitarray() object of binary data as its argument.
  	Returns a generator of sound samples suitable for use with the 
  	audiogen module.