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Baudot Code with Example

  • The Baudot Code
                           
    The 5-unit (symbol) Baudot code, invented by the French Engineer Emile Baudot in 1870, is an even-length code invented for use in his telegraph multiplexer system. This code was later modified as the 7 ½-unit teleprinter code. Further modification of the Baudot code led to the inventions of the 7-bit ASCII code and the 8-bit EBCIDIC, which are currently used in most computer applications.




    Features of the Baudot code

    ·         There are five symbols in each code word.
    ·         All symbols are of equal duration.
    ·         Symbols are denoted by pulses of positive and zero (or negative) voltage levels.
    ·         These voltage levels represent either a 0 or a 1.
    ·         There are 25 (=32) code words in the Baudot code.
    ·         The combinations of symbols include all binary numbers from 00000 to 11111.
    ·         To represent English alphabets, 26 code words are required. Only 6 combinations of symbols are left out and these are insufficient to represent numbers and punctuation marks.
    ·         So, the same combinations are used again with the help of a shift key.

    Table 1.15 shows a few examples of Baudot-code words.

    Table 1.15 A few examples of the five-unit Baudot code
    Letter
    Figure
    Code word
    A
    -
    1 1 0 0 0
    B
    ?
    1 0 0 1 1
    C
    :
    0 1 1 1 0
    D
    $
    1 0 0 1 0
    Since telegraph and teleprinter transmissions have become obsolete, the Baudot code is no longer in use in its original 5-unit and 7½-unit forms.

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