Directional audio coding (DirAC) is a method for spatial sound representation, applicable to arbitrary audio reproduction methods. In the analysis part, properties of the sound field in time and frequency in a single point are measured and transmitted as side information together with one or more audio waveforms. In the synthesis part, the properties of the sound field are reproduced using separate techniques for point-like virtual sources and diffuse sound. Different implementations of DirAC are described and differences between them are discussed. A modification of DirAC is presented, which provides a link to Binaural Cue Coding and parametric multi-channel audio coding in general (e.g. MPEG Surround).

Authors: Faller, Christof; Pulkki, Ville
Affiliations: EPFL Lausanne; Helsinki University of Technology(See document for exact affiliation information.)
AES Convention: 120 (May 2006) Paper Number: 6658
Publication Date: May 1, 2006
Subject: Spatial Perception and Processing

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