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This is often performed for a more realistic audio environment, actively implemented in cinema sound systems, technical theatre, home entertainment, video arcades, computer gaming, and a growing number of other applications.
Many popular surround sound formats have evolved over the years. They include ambisonics, quadraphonic, Dolby 5.1 Surround sound, and DTS.
Surround sound can be created using several methods. The simplest to understand uses several speakers around the listener to play audio coming from different directions. Another approach involves processing the audio using psychoacoustic sound localization methods to simulate a 3D sound field using headphones. The third approach, wave field synthesis , uses a very large number of speakers to generate the "audio hologram" of the original audio in the whole room ( as of 2004 the only commercial implementation of this is Iosono).
Surround sound is not limited to placement of speakers along a flat (2-dimensional) plane. Vertically-located audio sources can be considered.
5.1 uses:
5.1 EX includes a third surround channel that can be decoded at the listener's option for playback over additional surround speakers placed behind the viewers (rear speakers). The additional center rear information is split between the left and right back surround channels.
7.1 would use two additional speakers, although no consumerIn economics, consumers are individuals or households that "consume" goods and services generated within the economy. Since this includes just about everyone, the term is a political term as much as an economic term when it is used in everyday speech. home cinemaHome cinema also called Home theater seeks to reproduce cinema quality video and audio in the home. The video aspect usually involves a large-screen and/or high definition television or a projection system. Quality audio reproduction is usually achieved w applications currently exist for it. Some computers are capable of outputting a discreteThe word discrete comes from the latin word discretus which means separate''. It is used with different meanings in different contexts: In perception a discrete entity is something that can be perceived individually and not as connected to, or part of som 7.1 signal.
Note: A distinction is made between the number of discreteThe word discrete comes from the latin word discretus which means separate''. It is used with different meanings in different contexts: In perception a discrete entity is something that can be perceived individually and not as connected to, or part of som channels encoded in the original signal, and the number of channels that are reproduced for playback; these can be added using matrix decodingAn audio technology where a finite number of discrete audio channels (eg. 2) are decoded into a larger number of channels on play back (eg. The channels are generally, but not always, arranged for decoding by and encoder, and decoded for playback by a dec. A distinction is also made between the number of channels reproduced for playback, and the number of speakers over which these channels are played.
A 5.1 EX signal, for example, contains 5.1 discreteThe word discrete comes from the latin word discretus which means separate''. It is used with different meanings in different contexts: In perception a discrete entity is something that can be perceived individually and not as connected to, or part of som channels of information. Parts of the signal are then passed through a matrix decoderAn audio technology where a finite number of discrete audio channels (eg. 2) are decoded into a larger number of channels on play back (eg. The channels are generally, but not always, arranged for decoding by and encoder, and decoded for playback by a dec to create a 6.1 channel playback signal. The 6.1 channels are then properly played over 7.1 channels (i.e. 7 speakers and a subwoofer).