Abstract
The late reverberation characteristics of a sound field are often assumed to be perceptually isotropic, meaning that the decay of energy is perceived as equivalent in every direction. In this paper, we employ Ambisonics reproduction methods to reassess how a decaying sound field is analyzed and characterized and our capacity to hear directional characteristics within late reverberation. We propose the use of objective measures to assess the anisotropy characteristics of a decaying sound field. The energy-decay deviation is defined as the difference of the direction-dependent decay from the average decay. A perceptual study demonstrates a positive link between the range of these energy deviations and their audibility. These results suggest that accurate sound reproduction should account for directional properties throughout the decay.
Highlights
Artificial reverberation aims to reproduce the perceptual effect of sound propagating in a room (Schroeder and Logan, 1961; V€alim€aki et al, 2012)
Starting from a spatial impulse response (SIR) encoded in Ambisonics, which is a compact representation of the sound field in the spherical harmonic domain (SHD) (Gerzon, 1975), we first extract a set of directional impulse responses (DIRs) for a chosen set of incident directions
These results indicate that beyond a threshold close to IEDDðxÞ > 1 dB, the reproduction of directiondependent decays is necessary for an accurate reproduction of the sound field
Summary
Artificial reverberation aims to reproduce the perceptual effect of sound propagating in a room (Schroeder and Logan, 1961; V€alim€aki et al, 2012). A decaying sound field is typically considered perceptually isotropic (Lindau et al, 2012; Polack, 1993; Schlecht and Habets, 2017; Blesser, 2001) In accordance with this assumption, Schroeder suggested that the main requirement for multichannel artificial reverberators was to produce a set of low-correlated signals (Schroeder, 1962; Schroeder and Logan, 1961). The segmentation is determined through recursive linear regressions and an adaptive maximum deviation threshold This enables the identification of the aforementioned sections, i.e., the arrival of early reflections, during which time the incoherence measure quickly increases, and the onset of the stable maximum value maintained throughout the late reverberation tail (Masse et al, 2020a).
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