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Baudot Code with Example

Posted by Sreejith Hrishikesan ~ on ~ 0 comments

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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Dr. B Somanathan Nair, one of the top engineering text author of India. He was born on September 1, 1950 in Kerala, India. In 1971, he obta...

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