A model for the temporal evolution of the spatial coherence in decaying reverberant sound fields

Abstract

Reverberant sound fields are often modeled as isotropic. However, it has been observed that spatial properties change during the decay of the sound field energy, due to non-isotropic attenuation in non-ideal rooms. In this letter, a model for the spatial coherence between two sensors in a decaying reverberant sound field is developed for rectangular rooms. The modeled coherence function depends on room dimensions, surface reflectivity and orientation of the sensor pair, but is independent of the position of source and sensors in the room. The model includes the spherically isotropic (diffuse) and cylindrically isotropic sound field models as special cases.

The spatial coherence of noise fields evoked by continuous source distributions

“…Several publications have been dedicated to the coherence estimation for reverberant sound fields, e.g., Refs. [17][18][19], and references therein. A common assumption is that especially late reverberation affects the estimates of the spatial coherence in a similar way as diffuse sound, which can be approximated by superimposing plane waves of equal amplitude and uniformly distributed random phase originating from all directions.…”