In the past few years, sound recordings with spatial audio have moved from the realm of theoretical research to the actuality of physical and digital releases in the market. At present three Blu-ray disc formats utilize a traditional 5.1 surround-sound recording, with an added 4-channel layer of height channels. The topic of this paper is how to capture vertical localization effectively within this release format, utilizing existing research on hearing localization and techniques learned in the field. The proposed microphone array has time-of-arrival differences between all microphones, yet mixes down to 5.1 and stereo without excessive comb-filtering or other artifacts.
https://www.aes.org/e-lib/browse.cfm?elib=17986
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