Decorrelation in Feedback Delay Networks

The feedback delay network (FDN) is a popular filter structure to generate artificial spatial reverberation. A common requirement for multichannel late reverberation that the output signals are well decorrelated, as too high correlation can lead poor reproduction of source image and uncontrolled coloration. This article presents analysis induced by FDNs. It shown depends primarily on feedforward paths, while long tail produced recursive path does not contribute inter-channel correlation. impact matrix type, size, delays demonstrated. results show small FDNs with few channels tend have correlation, use significantly improves decorrelation, often leading lowest among tested cases. learnings this work support practical design reverberators immersive audio applications.