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Multiplex (television)
A multiplex or mux (called virtual sub-channel in the United States and Canada, and bouquet in France) is the erroneous term given to the grouping of program services that are sub-grouped as interleaved data packets for broadcast over a network or modulated multiplexed medium, which are split out at the receiving end. There are two different types of groupings, which are closely related but not identical.
In the United Kingdom, a terrestrial ''multiplex'' (usually abbreviated ''mux'') has a fixed bandwidth of 8 MHz CODFM of interleaved H.222 packets containing a number of ''channels''. In the United States, a similar arrangement using 6 MHz 8VSB is often described as a ''channel'' with ''virtual sub-channels''.
==Pay television multiplexes==
Many pay television services on cable and satellite television offer program service packages, in which a single provider offers a number of separate channels to its subscribers. The channels may be distinct in regards to the programming format (for example, one channel offering comedy programming and another carrying action and adventure films), be timeshifted, or offer different views of the same event ( such as overviews of a car race, the view from different drivers' cars or a view of the pits). Some pay television program services offer picture in picture (PIP) capabilities to follow the various feeds simultaneously on one screen. If the hardware allows, several channels in one multiplex can be viewed simultaneously. Pay television multiplexes may be purchased on a subscription or a pay-per-view basis.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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