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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
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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
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electrical currents at selected audio frequencies in wires which transmitted telegraphic messages electrically over long distances.
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77:. Their efforts to develop acoustic telegraphy, in order to reduce the cost of telegraph service, led to the
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54:. The key pulses were transmitted as pulses of a specific audio frequency. At the receiving end a device
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to the same frequency resonated to the pulses but not to others on the same wire.
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Attempt at multiplexing Morse code messages by assigning them different sounds
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311:, INSPEC Accession Number: 8770451, Current Version Published: 2006-02-27.
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92:, or frequency-division multiple access, used with radio frequencies.
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303:, IEEE Review, Feb. 2006, Volume: 52, Issue: 2, pp. 44– 48,
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Improvement in
Transmitters and Receivers for Electric Telegraphs
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Some of Thomas Edison's devices used multiple synchronized
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Inventors who worked on the acoustic telegraph included
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for each message. A telegrapher used a conventional
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Improvement in electro-haronic multiplex telegraphs
132:
Electrical
Telegraph for Transmitting Musical Tones
1416:
208:Circuits for Acoustic or Telephonic Telegraphs
338:
122:– Alexander Graham Bell, issued April 6, 1875
1353:Global telecommunications regulation bodies
1389:
345:
331:
148:Improvement In Electro-Harmonic Telegraphs
226:The five Edison patents were assigned to
174:– Thomas Edison, issued December 19, 1876
222:– Thomas Edison, issued December 7, 1880
186:– Thomas Edison, issued January 16, 1877
162:– Thomas Edison, issued October 10, 1876
150:– Elisha Gray, issued February 15, 1876
1417:
352:
210:– Thomas Edison, issued April 30, 1878
34:messages simultaneously over a single
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198:– Thomas Edison, issued March 5, 1878
134:– Elisha Gray, issued July 27, 1875;
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26:) was a name for various methods of
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14:
1441:
1398:
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988:Free-space optical communication
228:Western Union Telegraph Company
261:
50:key to tap out the message in
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30:(transmitting more than one)
1374:Telecommunication portal
1155:Telecommunications equipment
287:, New York (Penguin), 1998,
184:Acoustic Electric Telegraphs
7:
891:Alexander Stepanovich Popov
300:The Great Telephone Mystery
233:
10:
1446:
595:Telecommunications history
245:Invention of the telephone
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79:invention of the telephone
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1304:
1241:
1203:Public Switched Telephone
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1127:
1084:
1025:
1015:telecommunication circuit
976:Fiber-optic communication
959:
721:Francis Blake (telephone)
668:
516:Optical telecommunication
360:
1114:Orbital angular-momentum
551:Satellite communications
390:Communications satellite
993:Molecular communication
816:Gardiner Greene Hubbard
645:Undersea telegraph line
380:Cable protection system
1135:Communication protocol
921:Charles Sumner Tainter
736:Walter Houser Brattain
681:Edwin Howard Armstrong
489:Information revolution
281:The Victorian Internet
1109:Polarization-division
841:Narinder Singh Kapany
806:Erna Schneider Hoover
726:Jagadish Chandra Bose
706:Alexander Graham Bell
437:online video platform
267:Standage, pp. 195–199
215:U.S. patent 0,235,142
203:U.S. patent 0,203,019
191:U.S. patent 0,200,993
179:U.S. patent 0,186,330
167:U.S. patent 0,185,507
155:U.S. patent 0,182,996
143:U.S. patent 0,173,618
127:U.S. patent 0,166,095
115:U.S. patent 0,161,739
99:comes from the Greek
75:Alexander Graham Bell
951:Vladimir K. Zworykin
911:Almon Brown Strowger
881:Charles Grafton Page
536:Prepaid mobile phone
464:Electrical telegraph
901:Johann Philipp Reis
660:Wireless revolution
622:The Telephone Cases
479:Hydraulic telegraph
196:Acoustic Telegraphs
38:by using different
24:harmonic telegraphy
20:Acoustic telegraphy
1099:Frequency-division
1076:Telephone exchange
946:Charles Wheatstone
876:Jun-ichi Nishizawa
851:Innocenzo Manzetti
786:Reginald Fessenden
521:Optical telegraphy
354:Telecommunications
220:Acoustic Telegraph
160:Acoustic Telegraph
1412:
1411:
1150:Store and forward
1145:Data transmission
1059:Network switching
1010:Transmission line
856:Guglielmo Marconi
821:Internet pioneers
686:Mohamed M. Atalla
655:Whistled language
317:Telephone Patents
40:audio frequencies
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1401:
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1391:
1382:
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1243:Notable networks
1233:Wireless network
1173:Cellular network
1165:Types of network
1140:Computer network
1027:Network topology
941:Thomas A. Watson
796:Oliver Heaviside
781:Philo Farnsworth
756:Daniel Davis Jr.
731:Charles Bourseul
691:John Logie Baird
400:Data compression
395:Computer network
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716:Tim Berners-Lee
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484:Information Age
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314:Brooke Clarke.
279:Standage, Tom,
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136:Reissue # 8559
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1030:and switching
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761:Donald Davies
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568:Semiconductor
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67:Thomas Edison
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1430:Multiplexing
1086:Multiplexing
961:Transmission
926:Nikola Tesla
916:Henry Sutton
871:Samuel Morse
801:Robert Hooke
766:Amos Dolbear
701:John Bardeen
620:
600:Telautograph
504:Mobile phone
459:Edholm's law
442:social media
375:Broadcasting
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274:Bibliography
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86:tuning forks
83:
60:
28:multiplexing
23:
19:
18:
1286:NPL network
998:Radio waves
936:Alfred Vail
846:Hedy Lamarr
831:Dawon Kahng
791:Elisha Gray
751:Yogen Dalal
676:Nasir Ahmed
610:Teleprinter
474:Heliographs
71:Elisha Gray
1425:Telegraphy
1419:Categories
1332:Antarctica
1291:Toasternet
1213:Television
696:Paul Baran
628:Television
612:(teletype)
605:Telegraphy
583:transistor
561:Phryctoria
531:Photophone
509:Smartphone
499:Mass media
251:References
101:akoustikos
52:Morse code
1316:Americas
1305:Locations
1276:Internet2
1037:Bandwidth
741:Vint Cerf
638:streaming
616:Telephone
556:Semaphore
447:streaming
309:0953-5683
240:Telegraph
95:The word
32:telegraph
1384:Category
1271:Internet
1261:CYCLADES
1178:Ethernet
1128:Concepts
1052:terminal
1003:wireless
826:Bob Kahn
669:Pioneers
494:Internet
385:Cable TV
234:See also
97:acoustic
44:channels
1404:Commons
1394:Outline
1347:Oceania
1266:FidoNet
1251:ARPANET
1064:circuit
633:digital
362:History
108:Patents
1342:Europe
1312:Africa
1296:Usenet
1256:BITNET
1193:Mobile
1069:packet
578:MOSFET
573:device
370:Beacon
307:
291:
73:, and
1325:South
1320:North
1281:JANET
1218:Telex
1208:Radio
1047:Nodes
1042:Links
963:media
541:Radio
526:Pager
454:Drums
420:video
415:image
405:audio
256:Notes
56:tuned
48:Morse
1337:Asia
1223:UUCP
1183:ISDN
305:ISSN
289:ISBN
90:FDMA
1228:WAN
1198:NGN
1188:LAN
469:Fax
410:DCT
42:or
1421::
283:,
218:–
206:–
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170:–
158:–
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81:.
69:,
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1351:(
346:e
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332:v
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