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KF5JRV > TECH 09.04.16 12:40l 29 Lines 1565 Bytes #999 (0) @ WW
BID : 1247_KF5JRV
Read: GUEST
Subj: Baudot Code
Path: IW8PGT<IZ3LSV<IW0QNL<JH4XSY<JM1YTR<JE7YGF<N9PMO<N0KFQ<KF5JRV
Sent: 160409/1133Z 1247@KF5JRV.#NWAR.AR.USA.NA BPQK1.4.65
Émile Baudot Invents the Baudot Code, the First Means of Digital
Communication 1870 – 1874
In 1870 French telegraph engineer Émile Baudot invented
the Baudot code, a character set predating EDCDIC and ASCII, which
has been called the first means of digital communication. In
Baudot's code each character in the alphabet is represented by a
series of bits sent over a communication channel. The symbol rate
measurement (symbols per second or pulses per second) is known as
baud in Baudot's honor.
"Baudot invented his original code during 1870 and patented it during
1874. It was a 5-bit code, with equal on and off intervals, which
allowed telegraph transmission of the Roman alphabet and punctuation
and control signals. It was based on an earlier code developed by
Carl Friedrich Gauss and Wilhelm Weber in 1834.
"Baudot's original code was adapted to be sent from a manual keyboard,
and no teleprinter equipment was ever constructed that used it in its
original form. The code was entered on a keyboard which had just five
piano type keys, operated with two fingers of the left hand and three
fingers of the right hand. Once the keys had been pressed they were
locked down until mechanical contacts in a distributor unit passed
over the sector connected to that particular keyboard, when the
keyboard was unlocked ready for the next character to be entered,
with an audible click (known as the "cadence signal") to warn the
operator. Operators had to maintain a steady rhythm, and the usual
speed of operation was 30 words per minute."
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