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NRG Acoustics A-70: Multichannel audio
Surround sound is a way of enriching the sound reproduction high-quality of an audio source with additional audio channels from audio speakers that surround the listener (surround channels), providing sound from a 360 radius in the horizontal plane (2D) compared to "screen channels" (centre, [front] left, and [front] right) coming from only within the listener's frontward arc.
Surround sound is portrayed by a listener spot or sweet spot where audio effects performs best, and presents a fixed or forward perspective of the sound field to the listener around this location. The procedure improves the belief of sound spatialization by exploiting sound localization; a listener's capability to know the location or origin of a detected sound in direction and distance. Typically this is achieved by means of multiple discrete audio channels routed to an array of loudspeakers.
There are many surround sound based types and techniques, differing in processing and saving options combined with amount and placing of extra channels.
NRG Acoustics HJ-17: Fields of application
Though cinema and soundtracks represent the main purposes of surround techniques, its scope of application is expansive than that as surround sound enables creation of an audio-environment for all variations of functions. Multichannel surround sound techniques could be used to reproduce contents as various as music, conversation, synthetic or natural sounds for cinema, television, transmissions, or computing devices. When it comes to music content to illustrate, a live performance may make use of multichannel techniques in the context connected with an open-air event, of a musical theatre or perhaps transmissions; for a film particular techniques are adapted to movie theatre, or even to residence (e.g. home cinema systems).
The narrative space is also a content which could be improved upon through multichannel techniques. This applies mainly to cinema narratives, for example, the talk from the characters of a film, but will also be used on plays for theatre, to a meeting, or to incorporate voice-based comments in an archeological site or monument. Such as, an exhibit may very well be improved with topical ambient sound of water, birds, train or machine noises. Topical natural sounds can also be used in educative applications.
NRG Acoustics SG-4 - Other fields of application contain video game units, personal computers and other platforms.
In these purposes, the content would typically be fabricated noise made by the computer gadget in interaction with its user. Substantial work has also been done using multichannel for enhanced situation knowledge in government and general public safety purposes.
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