Extra surround channels mainly aim at consistent localization and height illusion
Evidence
The purpose of these extra channels is to improve the surround-sound experience for the listener so that they have more consistent localization all the way around themselves. In addition, some arrangements can be used to give an illusion of source height, which can give the listener a more realistic sense of the environment the reproduced sound is in. — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 2227
Categorization
- XREF: Extends the localization and spatial-hearing material elsewhere in the book into multichannel reproduction. — connects to: Horizontal-plane localization is mature while elevation reproduction is newly addressed; Adding rear channels to stereo does not improve spatial diffusion — , Toole, Floyd E - Sound reproduction-…, 1670; Limited human spatial resolution allows plausible upmix from fewer source channels (+2 more)
- corroborated: 2 independent passages support this claim — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 2227
Broader Connections
- Uncorrelated noise from surround speakers creates enveloping source perception.
#corroborates(0.78) — Ville Pulkki, Matti Karjalainen, Communication Acoustics- An…, 1914 - Uncorrelated ambient signals create an impression of directionless surround sound.
#corroborates(0.75) — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 2218