• Unipolar encoding is very simple and very primitive.
    The polarity of a pulse refers to weather it is positive or negative.
    Unipolar encoding is named because it uses only one polarity.
    The polarity is assigned to one of the two binary states, usually the 1.
    The other state, usually the 0 is represented by zero voltage 

    Example is given in animation video.
    Watch animation video

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