Spatial cross-correlation of reverberant sound fields

According to Chien and Soroka, the derivation of a narrow- band correlation function by Morrow, using a modal approach, included the assumption of zero cross-correlation of different modes at two different points. Chien and Soroka comment that this assumption is physically reasonable but not obvious. The purpose of this letter to the editor is to clarify this assumption and rederive the narrow-band correlation function in a detailed manner.Comme suite \ue0 l'analyse modale d\ue9taill\ue9e de Chien et Soroka quant \ue0 la corr\ue9lation crois\ue9e spatiale en salle de r\ue9verb\ue9ration, une analyse similaire est appliqu\ue9e \ue0 l'excitation sonore en bandes \ue9troites dans le cas d'un r\ue9gime permanent.Peer reviewed: YesNRC publication: Ye