def receive(samples):
"""
Convert an array of voltage samples into a message string.
"""
# digitize the voltage samples
d_samples = v_samples_to_d_samples(samples)
nsamples = len(d_samples)
# search through the samples starting at the beginning
message = []
start = 0
while True:
# locate sample at middle of next START bit
start = find_center_of_start_bit(d_samples,start,8)
if start < 0 or start + 10*8 >= nsamples:
break # no START bit found or too near end of samples
# grab the eight data bits which follow
bits = decode_data(d_samples,start+8,8,8)
# print bits
# first convert bit sequence to an int
# and then to a character, append to message
message.append(chr(lab1.bits_to_int(bits)))
# finally skip to the middle of the STOP bit
# and start looking for the next START bit
start += 9*8
# join all the message characters into a single string
return "".join(message)
def translateCharacter(recievedSamples,startPosition): sequence = numpy.array(recievedSamples[startPosition:startPosition+10]) tenBitIndex = lab1.bits_to_int(sequence) eightBitIndex = lab1.table_10b_8b[tenBitIndex] if eightBitIndex == None: return None character = chr(eightBitIndex) return character
