multiplexing

(redirected from Demuxer)
Also found in: Dictionary, Wikipedia.

multiplexing,

in communication, technique whereby two or more independent messages, or information-bearing signals, are carried by a single common medium, or channel. When multiplexing is performed, two or more channels are combined into a single channel, or, in a process often called demultiplexing, a single channel is divided into several subchannels. Many different types of multiplexing are possible. One type is frequency-division multiplexing, in which a single frequency channel is subdivided into two or more subchannels, each of which can then carry a smaller range of frequencies than could the original channel. Frequency-division multiplexing is used in television broadcasting, when audio and video signals share a single channel; in stereophonic FM radio broadcasting, when two audio signals share a single channel; and in microwave transmission of long-distance telephone calls, when 60 or more conversations are carried by a single microwave beam. A second type of multiplexing is time-division multiplexing, in which successive small time intervals are used for the transmission of messages over a single channel. Time-division multiplexing is often used in the construction of digital computers. When information can be stored into or retrieved from the computer's memory at a much greater rate than it can be supplied or used by an external device such as a card reader, printer, or teletype terminal, several such low-speed devices can share a single multiplexed data channel.

multiplexing

[′məl·tə‚pleks·iŋ]
(communications)
A set of techniques that enable the sharing of the usable electromagnetic spectrum of a telecommunications channel (the channel pass-band) among multiple users for the transfer of individual information streams.
In particular, the case in which the user information streams join at a common access point to the channel.

multiplexing

1. <communications> (Or "multiple access") Combining several signals for transmission on some shared medium (e.g. a telephone wire). The signals are combined at the transmitter by a multiplexor (a "mux") and split up at the receiver by a demultiplexor. The communications channel may be shared between the independent signals in one of several different ways: time division multiplexing, frequency division multiplexing, or code division multiplexing.

If the inputs take turns to use the output channel (time division multiplexing) then the output bandwidth need be no greater than the maximum bandwidth of any input.

If many inputs may be active simultaneously then the output bandwidth must be at least as great as the total bandwidth of all simultaneously active inputs. In this case the multiplexor is also known as a concentrator.

multiplexing

Transmitting several signals over a single communications line or computer channel. The two common techniques are frequency division multiplexing (see FDM), which separates signals by modulating the data onto different carrier frequencies, and time division multiplexing (see TDM), which separates signals by interleaving bits one after the other. See modulation, carrier, subcarrier, FDMA and TDMA.
References in periodicals archive ?
2: New: Improved demuxer a lot, many problem files can be opened now.
To complement Factum's middleware, ADI is providing a system solution for DAB/DAB+/DMB receivers -- including essential software modules such as MPEG2 TS demuxer, HE-AAC decoder, H.
Some other improvements in this release include faster seeking support for HTTP streams on ASF demuxer, support for deinterlacing with H264/AVC, and several improvements in AAC and MPEG2 performance.
Windows Media Audio Decoder -- Windows Media Video Decoder -- Windows Media ASF Demuxer -- Windows Media MMS Networking MPEG2 -- Video Decoder MPEG4 -- Video Decoder MPEG2 Program Stream and Transport Stream demuxer -- MPEG4 ISO Demuxer -- MP3 Audio Decoder -- AC3 Audio Decoder
GStreamer plug-in key features and benefits: -- Uniform framework allows for code re-use across TI's processors based on DaVinci technology (DM644x, DM355 and DM6467) and OMAP35x devices -- An extensible, industry-standard and open source framework allows developers to easily incorporate their own modules or interface with hundreds of community plug-ins (muxers, demuxers, codecs and filters) -- Pipeline engine allows developers to create custom workflows and omits need to write a new application for each use-case -- Plug-in leverages TI's eXpressDSP(TM) Digital Media (xDM)-based elements for plug-and-play codecs, which eliminates need for custom code per codec -- An open source portal enables collaborative development with the community Support and tools