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- Acoustic_telegraphy abstract "Acoustic telegraphy (also known as harmonic telegraphy) was a name for various methods of multiplexing (transmitting more than one) telegraph messages simultaneously over a single telegraph wire by using different audio frequencies or channels for each message. A telegrapher used a conventional Morse key to tap out the message in Morse code. The key pulses were transmitted as pulses of a specific audio frequency. At the receiving end a device tuned to the same frequency resonated to the pulses but not to others on the same wire.Inventors who worked on the acoustic telegraph included Charles Bourseul, Thomas Edison, Elisha Gray, and Alexander Graham Bell. Their efforts to develop acoustic telegraphy, in order to reduce the cost of telegraph service, led to the invention of the telephone.Some of Thomas Edison's devices used multiple synchronized tuning forks tuned to selected audio frequencies and which opened and closed electrical circuits at the selected audio frequencies. Acoustic telegraphy was similar in concept to present-day FDMA, or Frequency Division Multiple Access, used with radio frequencies.The word acoustic comes from the Greek akoustikos meaning hearing, as with hearing of sound waves in air. Acoustic telegraphy devices were electromechanical and made musical or buzzing or humming sound waves in air for a few feet. But the primary function of these devices was not to generate sound waves, but rather to generate alternating electrical currents at selected audio frequencies in wires which transmitted telegraphic messages electrically over long distances.".
- Acoustic_telegraphy wikiPageExternalLink freeabs_all.jsp?arnumber=1599357.
- Acoustic_telegraphy wikiPageExternalLink USRE8559.
- Acoustic_telegraphy wikiPageExternalLink TelPat.shtml.
- Acoustic_telegraphy wikiPageID "7431468".
- Acoustic_telegraphy wikiPageLength "3595".
- Acoustic_telegraphy wikiPageOutDegree "20".
- Acoustic_telegraphy wikiPageRevisionID "704622325".
- Acoustic_telegraphy wikiPageWikiLink Alexander_Graham_Bell.
- Acoustic_telegraphy wikiPageWikiLink Audio_frequency.
- Acoustic_telegraphy wikiPageWikiLink Category:Multiplexing.
- Acoustic_telegraphy wikiPageWikiLink Category:Telegraphy.
- Acoustic_telegraphy wikiPageWikiLink Channel_(communications).
- Acoustic_telegraphy wikiPageWikiLink Charles_Bourseul.
- Acoustic_telegraphy wikiPageWikiLink Electrical_telegraph.
- Acoustic_telegraphy wikiPageWikiLink Elisha_Gray.
- Acoustic_telegraphy wikiPageWikiLink Frequency-division_multiple_access.
- Acoustic_telegraphy wikiPageWikiLink Invention_of_the_telephone.
- Acoustic_telegraphy wikiPageWikiLink Morse_code.
- Acoustic_telegraphy wikiPageWikiLink Multiplexing.
- Acoustic_telegraphy wikiPageWikiLink Musical_tuning.
- Acoustic_telegraphy wikiPageWikiLink Telegraphy.
- Acoustic_telegraphy wikiPageWikiLink Thomas_Edison.
- Acoustic_telegraphy wikiPageWikiLink Tuning_fork.
- Acoustic_telegraphy wikiPageWikiLink Western_Union.
- Acoustic_telegraphy wikiPageWikiLinkText ""harmonic telegraph"".
- Acoustic_telegraphy wikiPageWikiLinkText "Acoustic telegraphy".
- Acoustic_telegraphy wikiPageWikiLinkText "acoustic telegraph".
- Acoustic_telegraphy wikiPageWikiLinkText "acoustic telegraphy".
- Acoustic_telegraphy wikiPageWikiLinkText "multiple telegraph".
- Acoustic_telegraphy wikiPageUsesTemplate Template:ISSN.
- Acoustic_telegraphy wikiPageUsesTemplate Template:Telecommunications.
- Acoustic_telegraphy wikiPageUsesTemplate Template:Telecommunications-stub.
- Acoustic_telegraphy wikiPageUsesTemplate Template:US_patent.
- Acoustic_telegraphy subject Category:Multiplexing.
- Acoustic_telegraphy subject Category:Telegraphy.
- Acoustic_telegraphy hypernym Name.
- Acoustic_telegraphy type Protocol.
- Acoustic_telegraphy comment "Acoustic telegraphy (also known as harmonic telegraphy) was a name for various methods of multiplexing (transmitting more than one) telegraph messages simultaneously over a single telegraph wire by using different audio frequencies or channels for each message. A telegrapher used a conventional Morse key to tap out the message in Morse code. The key pulses were transmitted as pulses of a specific audio frequency.".
- Acoustic_telegraphy label "Acoustic telegraphy".
- Acoustic_telegraphy sameAs Q424090.
- Acoustic_telegraphy sameAs Akustische_Telegrafie.
- Acoustic_telegraphy sameAs Telegrafía_armónica.
- Acoustic_telegraphy sameAs m.0261dqb.
- Acoustic_telegraphy sameAs Q424090.
- Acoustic_telegraphy wasDerivedFrom Acoustic_telegraphy?oldid=704622325.
- Acoustic_telegraphy isPrimaryTopicOf Acoustic_telegraphy.