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above and below the carrier frequency. The frequency of a radio or television station is considered to be the carrier frequency. However the carrier itself is not useful in transmitting the information, so the energy in the carrier component is a waste of transmitter power. Therefore, in many modern
254:'s location. At the receiver, the radio waves strike the receiver's antenna, inducing a tiny oscillating current in it, which is applied to the receiver. In the receiver, the modulation signal is extracted from the modulated carrier wave, a process called
249:
the carrier wave, altering some aspects of the carrier, to impress the information on the wave. The alternating current is amplified and applied to the transmitter's antenna, radiating radio waves that carry the information to the
127:
The term originated in radio communication, where the carrier wave creates the waves which carry the information (modulation) through the air from the transmitter to the receiver. The term is also used for an unmodulated
38:
of a typical radio signal from an AM or FM radio transmitter. The horizontal axis is frequency; the vertical axis is signal amplitude or power. It consists of a signal (C) at the carrier wave frequency
339:, by modulating each television channel on a carrier wave of a different frequency, then sending all the carriers through the cable. At the receiver, the individual channels can be separated by
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or a DC offset. It is present as an unmodulated sine wave within the signal's bandwidth, whose amplitude is independent of the signal's amplitude. See
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while the power in the carrier frequency component does not transmit information itself, so newer forms of radio communication (such as
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of a modulated AM or FM signal from a radio transmitter is shown above. It consists of a strong component
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than the message signal does. This is because it is impractical to transmit signals with low frequencies.
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Carriers are also widely used to transmit multiple information channels through a single cable or other
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signal to change the sound property of an audio recording and add a sense of depth and movement.
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system, such as radio or television broadcasting, information is transmitted across space by
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The purpose of the carrier is usually either to transmit the information through space as an
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system, hundreds of television channels are distributed to consumers through a single
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by modulating them on separate light carriers; light beams of different wavelengths.
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so the television channel desired can be displayed. A similar technique called
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was created from a revision of this article dated 5 June 2016
50:(SB) just above and below the carrier. The entire signal range is the
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modulation methods, the carrier is not transmitted. For example, in
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46:, with the modulation contained in narrow frequency bands called
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The information in a modulated radio signal is contained in the
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245:; this is the carrier wave. The information signal is used to
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694:
589:"Carrier wave with no modulation transports no information"
457:(DAB) do not use a conventional sinusoidal carrier wave.
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is used to transmit multiple channels of data through an
659:"What Is Modulation and How Does It Improve Your Music"
269:(AM) to add information to the carrier. The frequency
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618:"How does modulation work? | Tait Radio Academy"
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98:) for the purpose of conveying information.
8:
261:Most radio systems in the 20th century used
101:This carrier wave usually has a much higher
1783:Global telecommunications regulation bodies
499:. Unsourced material may be challenged and
397:. Unsourced material may be challenged and
185:. Unsourced material may be challenged and
1819:
775:
761:
753:
531:Carrier leakage is interference caused by
519:Learn how and when to remove this message
417:Learn how and when to remove this message
288:
282:
205:Learn how and when to remove this message
139:, carrier signals can be controlled by a
132:in the absence of any modulating signal.
724:, and does not reflect subsequent edits.
304:with the modulation contained in narrow
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27:Sinusoidal wave without any modulation.
7:
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497:adding citations to reliable sources
395:adding citations to reliable sources
183:adding citations to reliable sources
25:
1828:
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1809:
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1418:Free-space optical communication
739:
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349:wavelength division multiplexing
155:
564:Frequency-division multiplexing
329:frequency division multiplexing
118:frequency division multiplexing
359:Carrierless modulation systems
1:
744:The dictionary definition of
1804:Telecommunication portal
1585:Telecommunications equipment
221:originated with radio. In a
86:) by an information-bearing
1321:Alexander Stepanovich Popov
1876:
1025:Telecommunications history
455:digital audio broadcasting
314:single-sideband modulation
1792:
1633:Public Switched Telephone
1445:telecommunication circuit
1406:Fiber-optic communication
1151:Francis Blake (telephone)
946:Optical telecommunication
331:(FDM). For example, in a
318:beat frequency oscillator
277:at the carrier frequency
233:. In the transmitter, an
1544:Orbital angular-momentum
981:Satellite communications
820:Communications satellite
445:which is widely used in
1423:Molecular communication
1246:Gardiner Greene Hubbard
1075:Undersea telegraph line
810:Cable protection system
657:Rory PQ (May 8, 2019).
327:using the technique of
237:generates a sinusoidal
1855:Communication circuits
1565:Communication protocol
1351:Charles Sumner Tainter
1166:Walter Houser Brattain
1111:Edwin Howard Armstrong
919:Information revolution
702:
682:Listen to this article
642:Federal Standard 1037C
298:
55:
1539:Polarization-division
1271:Narinder Singh Kapany
1236:Erna Schneider Hoover
1156:Jagadish Chandra Bose
1136:Alexander Graham Bell
867:online video platform
701:
299:
297:{\displaystyle f_{C}}
235:electronic oscillator
33:
1381:Vladimir K. Zworykin
1341:Almon Brown Strowger
1311:Charles Grafton Page
966:Prepaid mobile phone
894:Electrical telegraph
733:More spoken articles
493:improve this section
391:improve this section
325:communication medium
281:
267:amplitude modulation
263:frequency modulation
179:improve this section
110:electromagnetic wave
1331:Johann Philipp Reis
1090:Wireless revolution
1052:The Telephone Cases
909:Hydraulic telegraph
593:University Of Texas
239:alternating current
223:radio communication
114:radio communication
1529:Frequency-division
1506:Telephone exchange
1376:Charles Wheatstone
1306:Jun-ichi Nishizawa
1281:Innocenzo Manzetti
1216:Reginald Fessenden
951:Optical telegraphy
784:Telecommunications
703:
622:Tait Radio Academy
451:digital television
294:
60:telecommunications
56:
36:frequency spectrum
1842:
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1580:Store and forward
1575:Data transmission
1489:Network switching
1440:Transmission line
1286:Guglielmo Marconi
1251:Internet pioneers
1116:Mohamed M. Atalla
1085:Whistled language
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96:modulation signal
18:Carrier frequency
16:(Redirected from
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1673:Notable networks
1663:Wireless network
1603:Cellular network
1595:Types of network
1570:Computer network
1457:Network topology
1371:Thomas A. Watson
1226:Oliver Heaviside
1211:Philo Farnsworth
1186:Daniel Davis Jr.
1161:Charles Bourseul
1121:John Logie Baird
830:Data compression
825:Computer network
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595:. Archived from
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549:Carrier recovery
537:frequency mixers
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1146:Tim Berners-Lee
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714:This audio file
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1080:Videotelephony
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1549:Code-division
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1534:Time-division
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1460:and switching
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1401:Coaxial cable
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1316:Radia Perlman
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1206:Lee de Forest
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1201:Thomas Edison
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1191:Donald Davies
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1176:Claude Chappe
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998:Semiconductor
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1516:Multiplexing
1391:Transmission
1356:Nikola Tesla
1346:Henry Sutton
1301:Samuel Morse
1231:Robert Hooke
1196:Amos Dolbear
1131:John Bardeen
1050:
1030:Telautograph
934:Mobile phone
889:Edholm's law
872:social media
805:Broadcasting
747:carrier wave
746:
738:
666:. Retrieved
662:
652:
637:
626:. Retrieved
624:. 2014-10-22
621:
612:
601:. Retrieved
597:the original
583:
559:Carrier tone
530:
515:
506:
491:Please help
479:
428:
413:
404:
389:Please help
377:
322:
308:
274:
260:
256:demodulation
219:carrier wave
218:
216:
201:
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177:Please help
165:
134:
126:
107:
100:
95:
91:
90:(called the
71:
67:
64:carrier wave
63:
57:
40:
1716:NPL network
1428:Radio waves
1366:Alfred Vail
1276:Hedy Lamarr
1261:Dawon Kahng
1221:Elisha Gray
1181:Yogen Dalal
1106:Nasir Ahmed
1040:Teleprinter
904:Heliographs
646:MIL-STD-188
231:transmitter
227:radio waves
1849:Categories
1762:Antarctica
1721:Toasternet
1643:Television
1126:Paul Baran
1058:Television
1042:(teletype)
1035:Telegraphy
1013:transistor
991:Phryctoria
961:Photophone
939:Smartphone
929:Mass media
729:Audio help
720:2016-06-05
668:August 23,
628:2024-06-17
603:2008-05-30
575:References
449:networks,
141:modulating
124:system).
84:modulation
80:sinusoidal
70:, or just
1860:Waveforms
1746:Americas
1735:Locations
1706:Internet2
1467:Bandwidth
1171:Vint Cerf
1068:streaming
1046:Telephone
986:Semaphore
877:streaming
533:crosstalk
480:does not
431:sidebands
378:does not
306:sidebands
217:The term
166:does not
120:(as in a
103:frequency
78:(usually
52:bandwidth
48:sidebands
1814:Category
1701:Internet
1691:CYCLADES
1608:Ethernet
1558:Concepts
1482:terminal
1433:wireless
1256:Bob Kahn
1099:Pioneers
924:Internet
815:Cable TV
731: ·
569:Sideband
543:See also
271:spectrum
265:(FM) or
252:receiver
247:modulate
147:Overview
130:emission
76:waveform
1834:Commons
1824:Outline
1777:Oceania
1696:FidoNet
1681:ARPANET
1494:circuit
1063:digital
792:History
718: (
689:minutes
501:removed
486:sources
441:), and
399:removed
384:sources
320:(BFO).
187:removed
172:sources
112:(as in
72:carrier
1772:Europe
1742:Africa
1726:Usenet
1686:BITNET
1623:Mobile
1499:packet
1008:MOSFET
1003:device
800:Beacon
453:, and
343:using
88:signal
1755:South
1750:North
1711:JANET
1648:Telex
1638:Radio
1477:Nodes
1472:Links
1393:media
971:Radio
956:Pager
884:Drums
850:video
845:image
835:audio
447:Wi-Fi
54:(BW).
1767:Asia
1653:UUCP
1613:ISDN
670:2020
644:and
484:any
482:cite
443:OFDM
437:and
382:any
380:cite
309:(SB)
170:any
168:cite
62:, a
34:The
1658:WAN
1628:NGN
1618:LAN
899:Fax
840:DCT
495:by
393:by
275:(C)
241:of
181:by
135:In
94:or
58:In
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