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NRG Acoustics HJ-17: Multichannel surround sound
Surround sound is a technique of enhancing the sound reproduction high-quality of any audio source with additional audio channels from audio speakers that surround the audience (surround channels), providing sound with a 360 radius in the horizontal plane (2D) contrary to "screen channels" (middle, [front] left, and [front] right) originating only on the listener's forward arc.
Multichannel audio is characterized by a listener location or sweet spot where the audio effects work best, and presents a limited or frontward perspective of the sound area towards listener at this location. The procedure enhances the notion of sound spatialization by using sound localization; a listener's ability to identify the location or origin of a noticed sound in path and distance. This typically is achieved by using multiple discrete audio channels routed to an array of loudspeakers.
There are various surround based types and techniques, ranging in processing and saving options combined with the number and location more channels.
NRG Acoustics SG-4: Domains of application
Though cinema and soundtracks signify the foremost purposes of surround approaches, its scope of use is larger than that as surround sound enables creation of an audio-environment for all sorts of purposes. Multichannel audio techniques are useful to recreate contents as various as music, conversation, synthetic or natural sounds for cinema, television, broadcasting, or pcs. Relating to music content to illustrate, an active performance may make use of multichannel techniques in the context of an open-air show, of an musical theatre or perhaps for broadcasting; for a film particular techniques are adapted to cinema, or to home (e.g. home cinema systems).
The narrative place is also a content that could be improved through multichannel approaches. This applies mainly to cinema narratives, for example, the dialog from the characters of a film, but might be also applied to plays for theatre, to a seminar, or to incorporate voice-based comments in an archeological site or monument. As an example, an exhibition might well be enhanced with topical background sound of water, birds, train or machine noise. Topical natural sounds could also be used in educative applications.
NRG Acoustics A-70 - Several other fields of application incorporate gaming consoles, computers along with other platforms.
In this applications, the content would typically be artificial noise maded by the computer system in interaction with its user. Substantial work has been specifically done using multichannel surround sound for enhanced situation knowledge in army and general population safety purposes.
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