Definition:Baudot Code
Jump to navigation
Jump to search
Definition
The Baudot code is a binary code for telegraphy.
Each character in the alphabet is represented by a series of five bits, sent over a transmission line.
Code | Europe | UK | ||||||
---|---|---|---|---|---|---|---|---|
$\text {V}$ | $\text {IV}$ | $\text {I}$ | $\text {II}$ | $\text {III}$ | Letter | Digit | Letter | Digit |
blank | blank | blank | blank | |||||
$\bullet$ | $\text A$ | $1$ | $\text A$ | $1$ | ||||
$\bullet$ | $\text E$ | $2$ | $\text E$ | $2$ | ||||
$\bullet$ | $\bullet$ | $\acute {\text E}$ | $/$ | $\&$ | ${}^1 /$ | |||
$\bullet$ | $\text Y$ | $3$ | $\text Y$ | $3$ | ||||
$\bullet$ | $\bullet$ | $\text U$ | $4$ | $\text U$ | $4$ | |||
$\bullet$ | $\bullet$ | $\text I$ | $\underline {\text o}$ | $\text I$ | ${}^3 /$ | |||
$\bullet$ | $\bullet$ | $\bullet$ | $\text O$ | $5$ | $\text O$ | $5$ | ||
$\bullet$ | Digit $\dagger$ | blank | Digit $\dagger$ | blank | ||||
$\bullet$ | $\bullet$ | $\text J$ | $6$ | $\text J$ | $6$ | |||
$\bullet$ | $\bullet$ | $\text G$ | $7$ | $\text G$ | $7$ | |||
$\bullet$ | $\bullet$ | $\bullet$ | $\text H$ | $\underline {\text h}$ | $\text H$ | ${}^1$ | ||
$\bullet$ | $\bullet$ | $\text B$ | $8$ | $\text B$ | $8$ | |||
$\bullet$ | $\bullet$ | $\bullet$ | $\text C$ | $9$ | $\text C$ | $9$ | ||
$\bullet$ | $\bullet$ | $\bullet$ | $\text F$ | $\underline {\text f}$ | $\text F$ | ${}^5 /$ | ||
$\bullet$ | $\bullet$ | $\bullet$ | $\bullet$ | $\text D$ | $0$ | $\text D$ | $0$ | |
$\bullet$ | blank | Letter $\ddagger$ | blank | Letter $\ddagger$ | ||||
$\bullet$ | $\bullet$ | $\underline {\text t}$ | $.$ | $-$ | $.$ | |||
$\bullet$ | $\bullet$ | $\text X$ | $,$ | $\text X$ | ${}^9 /$ | |||
$\bullet$ | $\bullet$ | $\bullet$ | $\text Z$ | $:$ | $\text Z$ | $:$ | ||
$\bullet$ | $\bullet$ | $\text S$ | $;$ | $\text S$ | ${}^7 /$ | |||
$\bullet$ | $\bullet$ | $\bullet$ | $\text T$ | $!$ | $\text T$ | ${}^2$ | ||
$\bullet$ | $\bullet$ | $\bullet$ | $\text W$ | $?$ | $\text W$ | $?$ | ||
$\bullet$ | $\bullet$ | $\bullet$ | $\bullet$ | $\text V$ | $'$ | $\text V$ | ${}^1$ | |
$\bullet$ | $\bullet$ | Erasure | Erasure | $*$ | $*$ | |||
$\bullet$ | $\bullet$ | $\bullet$ | $\text K$ | $($ | $\text K$ | $($ | ||
$\bullet$ | $\bullet$ | $\bullet$ | $\text M$ | $)$ | $\text M$ | $)$ | ||
$\bullet$ | $\bullet$ | $\bullet$ | $\bullet$ | $\text L$ | $=$ | $\text L$ | $=$ | |
$\bullet$ | $\bullet$ | $\bullet$ | $\text R$ | $-$ | $\text R$ | $-$ | ||
$\bullet$ | $\bullet$ | $\bullet$ | $\bullet$ | $\text Q$ | $/$ | $\text Q$ | $/$ | |
$\bullet$ | $\bullet$ | $\bullet$ | $\bullet$ | $\text N$ | $\text N^{\text o}$ | $\text N$ | $\pounds$ | |
$\bullet$ | $\bullet$ | $\bullet$ | $\bullet$ | $\bullet$ | $\text P$ | $\%$ | $\text P$ | $+$ |
The columns are arranged in the order they are, that is:
- $\text {V}$, $\text {IV}$, $\text {I}$, $\text {II}$, $\text {III}$
because that is how they were arranged on the original machines that were used to perform the encoding.
- $\dagger \quad$ After receiving this code, all following codes are interpreted as digits until the next Letter code.
- $\ddagger \quad$ After receiving this code, all following codes are interpreted as letters until the next Digit code.
Source of Name
This entry was named for Émile Baudot.
Historical Note
The Baudot code was invented by Émile Baudot in the $1870$s.
It was widely used in telegraphy.
It superseded Morse code but has now been mostly replaced by ASCII.
Sources
- 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): Baudot code