Microphone sets, panning functions and channel objects

Menzies, Dylan and Fazi, Filippo Maria (2017) Microphone sets, panning functions and channel objects. In Proceedings of 24th International Congress on Sound and Vibration. International Institute of Acoustics and Vibration. 8 pp .

Record type: Conference or Workshop Item (Paper)

Abstract

A common approach for sound field reproduction is to encode the spatial audio scene with a fixed set of channel signals using panning functions or microphones. The channels are then used to drive loudspeakers either directly or via a linear decoding process. A combination of physical and psychoacoustic effects enable the approximate reproduction of the spatial percepts of the original scene. Older examples include Stereo and Ambisonics. With the arrival of object-based audio systems the problem has naturally arisen of how to include channel based material. Here we begin by presenting a framework for discussing channel encodings. This is applied to the general problem of converting between channel encodings, and specifically the decoding of channel based objects to arbitrary arrays. We then address the problem of representing a channel encoding using fewer channels, in order to reduce storage or transmission cost, and use weights to focus the encoding effort.

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