rtl-part.py

 def packed_bytes_to_iq(self, bytes):
        ''' Convenience function to unpack array of bytes to Python list/array
        of complex numbers and normalize range. Called automatically by read_samples()
        '''
        if has_numpy:
            # use NumPy array
            iq = np.empty(len(bytes)//2, 'complex')
            iq.real, iq.imag = bytes[::2], bytes[1::2]
            iq /= (255/2)
            iq -= (1 + 1j)
        else:
            # use normal list
            iq = [complex(i/(255/2) - 1, q/(255/2) - 1) for i, q in izip(bytes[::2], bytes[1::2])]

        return iq