
Ambisonics is a full-sphere surround sound technique: in addition to the horizontal plane, it covers sound sources above and below the listener. This virtual mic is free-field normalised, which means it has a constant gain of one for on-axis sounds. The illustration on the left shows some exampled created with this formula. Please do not implement...
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http://en.wikipedia.org/wiki/Ambisonics

ambisonics, ambisonic 1. A recording and reproduction system that uses separate channels and speakers to create the effect of being surrounded by sound (a collective noun that takes a singular verb; such as, 'ambisonics is a great listening experience'). 2. A system of sound reproduction that uses a combination of channels and speakers to produce ...
Found on
http://www.wordinfo.info/words/index/info/view_unit/98/2

a system of sound reproduction that uses a combination of channels and speakers to produce an effect of surrounding the listener with the sound.
Found on
https://www.infoplease.com/dictionary/ambisonics
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