Dynamic diffuse signal processing for sound reinforcement and reproduction.
|Authors||Moore, Jonathan B. and Hill, Adam J.|
High inter-channel coherence between signals emitted from multiple loudspeakers can cause undesirable acoustic and psychoacoustic effects. Examples include position-dependent low-frequency magnitude response variation, where comb-filtering leads to the attenuation of certain frequencies dependent on path length differences between multiple coherent sources, lack of apparent source width in multi-channel reproduction and lack of externalization in headphone reproduction. This work examines a time-variant, real-time decorrelation algorithm for the reduction of coherence between sources as well as between direct sound and early reflections, with a focus on minimization of low-frequency magnitude response variation. The algorithm is applicable to a wide range of sound reinforcement and reproduction applications, including those requiring full-band decorrelation. Key variables which control the balance between decorrelation and processing artifacts such as transient smearing are described and evaluated using a MUSHRA test. Variable values which render the processing transparent whilst still providing decorrelation are discussed. Additionally, the benefit of transient preservation is investigated and is shown to increase transparency.
|Keywords||Audio engineering; Loudspeakers; Digital signal processing; Psychoacoustics|
|Journal||Journal of the Audio Engineering Society|
|Publisher||Audio Engineering Society|
|Digital Object Identifier (DOI)||https://doi.org/10.17743/jaes.2018.0054|
|Web address (URL)||http://hdl.handle.net/10545/623149|
|Publication dates||16 Nov 2018|
|Publication process dates|
|Deposited||23 Nov 2018, 13:37|
|Contributors||University of Derby|
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