Dynamic diffuse signal processing for sound reinforcement and reproduction.
AffiliationUniversity of Derby
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AbstractHigh 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.
CitationMoore, J.B., and Hill, A.J. (2018) ‘Dynamic diffuse signal processing for sound reinforcement and reproduction’, Journal of the Audio Engineering Society, 66 (11), pp.953-965. doi: 10.17743/jaes.2018.0054
PublisherAudio Engineering Society
JournalJournal of the Audio Engineering Society