Mixing monophonic and stereophonic sound sources into multichannel surround is traditionally done using divergence-based X-Y controls or by grouping stereo panners. An enhanced method, based on surround phantom positioning, is proposed, presenting a natural generalization of traditional stereo mixing techniques. Using matrix manipulations, each stereophonic source is rotated in the surround coordinate system to an arbitrary direction within 360 degrees, its stereophonic width is stretched to any desired stage width from 0 to 360 degrees, and its distance from the listener is set using a distance pan-pot, based on a room simulation. The proposed method is also compatible with surround sound inputs. The method has been implemented in real-time DSP, with applications in both audio production and consumer audio.:
https://www.aes.org/e-lib/browse.cfm?elib=9096
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