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NRG Acoustics HJ-17: Multichannel surround sound
Multi channel audio is a technique for enriching the sound processing high quality of an audio source with additional audio channels from speakers that surround the listener (surround channels), providing sound with a 360 radius within the horizontal plane (2D) in contrast to "screen channels" (center, [front] left, and [front] right) originating only from the listener's forward arc.
Multichannel surround sound is characterized by a listener position or sweet spot where audio effects perform best, and presents a limited or forward perspective of the sound area towards listener at this location. The technique enhances the conception of sound spatialization by taking advantage of sound localization; a listener's capability to identify the location or origin of a noticed sound in route and distance. This typically is achieved with the help of multiple discrete audio channels routed to an array of loudspeakers.
There are lots of multi channel audio based models and methods, ranging in reproduction and recording tactics combined with the amount and placing of extra stations.
NRG Acoustics SG-4: Fields of application
Though cinema and soundtracks represent the major purposes of surround approaches, its scope of application is much wider than that as multichannel surround sound enables creation of an audio-environment for all variations of functions. Multichannel surround sound techniques may be used to reproduce contents as various as music, conversation, natural or synthetic sounds for cinema, television, transmissions, or pc's. In terms of music material to illustrate, a live performance is able to use multichannel techniques in the context of an open-air event, of an musical theatre or perhaps for broadcasting; for a film certain techniques are adapted to movie theater, or even to home (e.g. home cinema systems).
The narrative space is also a content that could be improved through multichannel techniques. This is applicable mainly to cinema narratives, such as the dialog of the characters of a film, but might be also applied to plays for theatre, to a seminar, or to blend voice-based comments in an archeological site or monument. For example, an exhibition could very well be improved with topical background sound of water, wild birds, train or equipment noises. Applicable natural sounds can also be used in instructive programs.
NRG Acoustics A-70 - Alternative fields of application incorporate gaming systems, computers and other platforms.
In such purposes, the content would typically be synthetic noise generated by the computer system in interaction with its user. Significant work has also been done using surround sound for enhanced situation knowledge in military services and public safety purposes.
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