A method of coding in a plurality of unit coding circuit stages connected in cascade and of the same number as the coded bits comprises the steps of applying input signals to a first unit coding circuit stage, rectifying the input signals in the first stage, discriminating the polarity of the input signals in the first stage, successively applying the absolute value output signals of the first stage to the following stages for coding the absolute value signals, and converting the coded pulses of the following stages into series-coded pulses by discriminating the polarity of the input signals in the first stage in the coding period for the absolute value signals in the following stages.
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