In telecommunications, multiplexing (also muxing or MUXing) is the combining of two or more information channels onto a common transmission medium using hardware called a multiplexer or (MUX). The reverse of this is known as inverse multiplexing, demultiplexing, or demuxing. George O. Squier (1863–1934) invented the principle in 1910 using a carrier frequency to combine multiple telephone signals on one telephone line. BlackBerry 7100t Telecommunication refers to communication over long distances. ... Information as a concept bears a diversity of meanings, from everyday usage to technical settings. ... A common carrier is an organization that transports a product or service using its facilities, or those of other carriers, and offers its services to the general public. ... A transmission medium is any material substance, such as fiber-optic cable, twisted-wire pair, coaxial cable, dielectric-slab waveguide, water, or air, that can be used for the propagation of signals, usually in the form of modulated radio, light, or acoustic waves, from one point to another. ... Hardware is the general term that is used to describe physical artifacts of a technology. ... A multiplexer combines more than one input into a single output. ... An inverse multiplexer (often abbreviated to inverse mux, imux or demux) allows a data stream to be broken into multiple lower data rate communications links. ... Major General George Owen Squier (March 21, 1863 - March 24, 1934) Born in Dryden MI. USA, he graduated from Westpoint in 1887 and received a Ph. ... 1863 (MDCCCLXIII) is a common year starting on Thursday of the Gregorian calendar (or a common year starting on Saturday of the Julian calendar). ... 1934 (MCMXXXIV) was a common year starting on Monday (link will take you to calendar). ... -1... Carrier frequency is the fundamental frequency used in both amplitude modulation and frequency modulation i. ... The telephone or phone (Greek: tele = far away and phone = voice) is a telecommunications device which is used to transmit and receive sound (most commonly voice and speech) across distance. ...

In electrical communications, the two basic forms of multiplexing are time-division multiplexing (TDM) and frequency-division multiplexing (FDM). In optical communications, FDM is referred to as wavelength division multiplexing (WDM). The term communications is used in a number of disciplines: Communications, also known as communication studies is the academic discipline which studies communication, generally seen as a mixture between media studies and linguistics. ... Time-division multiplexing (TDM) is a type of digital multiplexing in which two or more apparently simultaneous channels are derived from a given frequency spectrum, i. ... Frequency-division multiplexing (FDM) is a form of signal multiplexing where multiple baseband signals are modulated on different frequency carrier waves and added together to create a composite signal. ... In telecommunications wavelength division multiplexing (WDM) is a technology which multiplexes several optical carrier signals on a single optical fibre by using different wavelengths (colours) of laser light to carry different signals. ...

When encoding video, multiplexing often refers to the process of interleaving audio and video into one coherent stream. In digital television, DVB, ATSC, and ISDB can all multiplex several channels together. In digital radio, both the EUREKA 147 system of Digital audio broadcasting and the HD Radio and Digital Radio Mondiale systems of IBOC can multiplex channels. This is essentially required with DAB-type transmissions, but is entirely optional with IBOC systems. Interleaving in computer science is a way to arrange data in a non-contiguous way in order to increase performance. ... Digital television (DTV) uses digital modulation and compression to broadcast video, audio and data signals to television sets. ... DVB, short for Digital Video Broadcasting, is a suite of internationally accepted, open standards for digital television maintained by the DVB Project, an industry consortium with more than 270 members, and published by a Joint Technical Committee (JTC) of European Telecommunications Standards Institute (ETSI), European Committee for Electrotechnical Standardization (CENELEC... The Advanced Television Systems Committee (ATSC) is the group that helped to develop the new digital television standard for the United States, also adopted by Canada, Mexico, and South Korea and being considered by other countries. ... Integrated Services Digital Broadcasting (ISDB) is the digital television (DTV) and digital audio broadcasting (DAB) format. ... This article needs to be cleaned up to conform to a higher standard of quality. ... Eureka 147 is a protocol for digital radio broadcasting originally developed in Europe, but now being deployed in many countries around the world. ... Digital audio broadcasting or DAB is a technology for broadcasting audio programming in digital form that was designed in the late 1980s. ... HD-Radio is a marketing catch-phrase used for IBOC, the terrestrial digital radio standard in the United States. ... Digital Radio Mondiale (DRM) is an international non-profit consortium committed to designing and implementing an open-source platform for digital radio broadcasting around the world, especially on shortwave. ... In-band on-channel (IBOC) is a method of transmitting digital and analog radio broadcast signals simultaneously on the same frequency. ...

In spectroscopy the term is used in a related sense to indicate that the experiment is performed with a mixture of frequencies at once and their respective response unravelled afterwards using the Fourier transform principle. Extremely high resolution spectrum of the Sun showing thousands of elemental absorption lines (fraunhofer lines) Spectroscopy is the study of spectra, that is, the dependence of physical quantities on frequency. ... The Fourier transform, named after Joseph Fourier, is an integral transform that re-expresses a function in terms of sinusoidal basis functions, i. ...

In FM broadcasting and other analog radio mediums, multiplexing is a term commonly given to the process of adding subcarriers to the audio signal before it enters the transmission equipment where modulation occurs. Multiplexing in this sense is sometimes known as MPX. Roberts FM radio FM radio is a broadcast technology invented by Edwin Howard Armstrong that uses frequency modulation to provide high-fidelity sound over broadcast radio. ... A subcarrier is separate analog or digital signal carried on a main radio transmission, which carries extra information such as voice or data. ... Modulation is the process of varying a carrier signal, typically a sinusoidal signal, in order to use that signal to convey information. ...

See also

• multiplexer
• code-division multiple access (CDMA)
• codec (coder-decoder)
• polarization-division multiplexing (PDM)
• statistical multiplexing

A multiplexer combines more than one input into a single output. ... General Information Generically (as a multiplexing scheme), code division multiple access (CDMA) is any use of any form of spread spectrum by multiple transmitters to send to the same receiver on the same frequency channel at the same time without harmful interference. ... Codec is a portmanteau of either Compressor-Decompressor or Coder-Decoder, which describes a device or program capable of performing transformations on a data stream or signal. ... Statistical multiplexing is similar to time-division multiplexing (TDM), except that, rather than arbitrarily assigning a time slot to each signal, each signal is assigned a slot according to priority and need. ...

References

• Federal Standard 1037C