When sending a digital signal, long sequences of 0s or 1s in the original bit sequence can lead to a signal which in practise is difficult to decode when received. Thus a first step in the process of creating a waveform from a sequence of bits typically involves scrambling the bit sequence: replacing the original bit sequence in a reversible way by one with a roughly equal number of 0s and 1s, so that whether a particular bit after scrambling is 0 or 1 is pseudo-random.
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