By breaking up the phase coherence of a signal broadcast from multiple loudspeakers, it is possible to control the perceived spatial extent and location of a sound source. This so-called signal decorrelation process is commonly achieved using a set of linear filters and finds applications in audio upmixing, spatialization, and auralization. Allpass filters make ideal decorrelation filters since they have unit magnitude spectra and therefore can be perceptually transparent. Here, we present a method for designing allpass decorrelation filters by specifying group delay trajectories in a way that allows for control of the amount of correlation as a function of frequency. This design is efficiently implemented as a cascade of biquad allpass filters. We present statistical and perceptual methods for evaluating the amount of decorrelation and audible distortion.

Authors: Canfield-Dafilou, Elliot K.; Abel, Jonathan S.
Affiliation: Center for Computer Research in Music and Acosutics (CCRMA), Stanford University, Stanford, CA, USA
AES Convention: 144 (May 2018) Paper Number: 9991
Publication Date: May 14, 2018
Subject: Posters: Audio Processing/Audio Education

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