2023-07-22 07:34:34
Introduction
Code US TTY
The Baudot code is in history one of the first binary codes used thanks to a machine. It is also called telegraph code or International Alphabet (AI) n°2 or CCITT code n°2.
It is a binary code, that is to say that each character that we want is coded by a combination (A combination can be:) of 0 and 1. The code provides only 5 bits to code each character, so there are only 25 = 32 combinations. But if you want to code letters and numbers, there are not enough combinations. This is why the Baudot code (The Baudot code is in history one of the first binary codes used thanks to…) contains two sets of characters called Letters (Lower Case) and Numbers (Upper Case). In fact, the Digits set also contains other symbols (punctuation, &, #…). Two characters Inversion Letters (code 31) and Inversion Numbers (code 27) allow switching between the two sets.
Obviously, the downside is frequent switching. On the other hand, this code, although richer than morse code, does not deal with lower case letters and certain symbols.
Historical
strip of paper (Paper (from the Latin papyrus) is a material made from fibers…) with holes representing the “Code Baudot”
The first code of this type was developed by Ămile Baudot (Ămile Baudot, by his full name Jean Maurice Ămile Baudot, (September 11, 1845 in Magneux,…) in 1874: it was the International Alphabet No. 1. It is no longer used. The characters were composed using a five-key keyboard, where each key corresponded to one of the five bits of each character.
Around 1901, the original Baudot code was modified by Donald Murray who rearranged the characters, added new symbols, and introduced character sets. Since he wanted to use a typewriter keyboard, there was no longer any connection between the code itself and the layout of the keys. He therefore organized the characters so that the most common transitions between characters generate a minimum number of transitions between the five bits of the code, which minimizes wear and tear on the hardware.
Western Union modified Murray’s code, eliminating some characters. The code obtained is the current Baudot code, CCITT code n°2. We present here the US TTY code, very close to the CCITT code. It differs from it by an inversion (BEL and ‘), and additional definitions in the FIGS (#, & and !), voluntarily left undefined by CCITT n°2 to allow national uses.
We also made (Rendering is a computer process calculating the 2D image (equivalent to a photograph)…) a tribute to Emile Baudot, using part of his name to make it a signal modulation unit ( General terms A signal is a simplified and generally coded message. It exists…), the Baud.
Code US TTY
Correspondence table Code Characters in binary octal hexadecimal decimal letter mode number mode 00000 00 00 0 Nothing (NUL) 00001 01 01 1 T 5 00010 02 02 2 Carriage return 04 4 SP = 00101 05 05 5 H ÂŁ 00110 06 06 6 N , 00111 07 07 7 M . 0100010088 Linefeed 15 0D 13 P 0 01110 16 0E 14 C: 01111 17 0F 15 V; Code Characters in binary octal hexadecimal decimal letter mode number mode 10000 20 10 16 E 3 10001 21 11 17 Z ” 10010 22 12 18 D $ 10011 23 13 19 B ? 10100 24 14 20 S Ringtone (BEL) 10101 25 15 2 1 Y 6 10110 26 16 22 F !10111 27 17 23 X / 11000 30 18 24 A – 11001 31 19 25 W 2 11010 32 1A 26 J ‘ 11011 33 1B 27 Activate number mode 11100 34 1C 28 U 7 11101 35 1D 29 Q 1 11110 36 1E 30 K ( 11111 37 1F 31 Activate letter mode
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