Telegraphy

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telegraphy

[tə′leg·rə·fē]
(communications)
Communication at a distance by means of code signals consisting of current pulses sent over wires or by radio.

Telegraphy

 

the branch of science and technology that studies the principles of establishing telegraph communication, develops methods for transmitting telegraph signals and the equipment required by these methods, and evaluates the quality of data transmission over telegraph channels.

As a scientific and technical discipline, telegraphy is divided into the following branches, corresponding to the principal areas of interest: telegraph codes, dealing with the optimum conversion of alphameric data into combinations of electrical signals during transmission and the reciprocal conversion of the signals upon reception; terminal equipment, dealing with design principles for telegraph equipment, transmitters and reperforators, methods of signal transmission and reception, and the development of electronic equipment; telegraph channels, dealing with the most economic use of expensive wire communications and the design of channels with specific characteristics; and telegraph networks, dealing with the choice of methods for connecting subscribers and terminal points, the most advantageous distribution of stations, and the quality of subscriber services.

In order to ensure high-quality transmission in telegraphy, studies are being conducted on signal distortions, the causes and laws governing these distortions, and errors that occur during data transmission and methods of eliminating such errors.

Unlike other forms of communication, telegraphy operates with discrete messages composed of a finite number of symbols—letters, numbers, and punctuation marks. The signals that transmit these messages are also discrete. The theoretical basis of telegraphy is the general theory of communications, information theory, and the theory of potential noise immunity. Probability theory and Boolean algebra also find application in telegraphy.

Phototelegraphy is a special branch of telegraphy and has historically been included in the discipline. It studies the principles of facsimile.

References in periodicals archive ?
The Company also publishes daily newspapers including Ziua (The Day) and Telegraf Prahovei (Prahova Valley Telegraph).
Ricksen also indicated in a recent interview with Dutch newspaper de Telegraf that he would extend his stay in Glasgow if Rangers came up with the right terms.
The company evolved from the former state enterprise, and its predecessor, Polska Poczta, Telegraf i Telefon (Polish Post, Telegraph and Telephone).
Some of those initially cited to have signed the petition, including Vilma Trajkovska, late President Boris Trajkovski's wife, and Velimir Stojkovski, Rector of the University of Ss Cyril and Methodius, told Telegraf.
RIGA -- After the restructuring of Parex bank and the breakup of the bank into a 'good,' or 'core' assets and 'bad,' or 'non-core' assets, the latter assets are secretly planned to go insolvent, perhaps, in two years, according to proposals for restructuring Parex that were approved at a government meeting, this according to 'Baltic Screen' articles printed in the newspapers Neatkariga and Telegraf, reports news agency LETA.
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Among the seven printed media surveyed, the Sega daily has been most negative regarding PM Borisov, while the wide-circulation Telegraf daily has been the most positive.
The mayor had come forward with an initiative to build a nuclear power station not far from the city, reported the Telegraf newspaper.
New Bulgarian Media Group owns the national BBT TV channel, the Telegraf daily, Weekend weekly, Monitor daily, Politika weekly, the newly-created Vseki Den daily, as well as the local Veliko Tarnovo daily Borba and the Plovdiv daily Maritsa.
Chas (The Hour) and Telegraf (The Telegraph) are the Russian-language newspapers that each enjoy a considerable market share.
New Bulgarian Media Group owns the national BBT TV channel, the Telegraf (Telegraph) daily, Weekend weekly, Monitor daily, Politika (Politics) weekly, the newly-created Vseki Den (Every Day) daily, as well as the local Veliko Tarnovo daily Borba (Fight) and the Plovdiv daily Maritsa.