Adapting Artificial Reverberation Architectures for B-format Signal Processing

A method to create native B-format through adapting known architectures.

Auralisation ray-traced volume modelling reverberation methods presently appear to be a preferred approach for generating surround sound reverberation. However, a wide literature describing various architectures for artificial reverberation filters is extant. Many of these alternative delay-line methods give distinct performance advantages, in that they are not reliant upon convolution or volume modelling, and allow a variety of tonal and spatial parameters to be modified independently. The authors describe a method to expand or adapt these known architectures to an Ambisonic B-format context, and provide an illustrative example native B-format reverberator. Central to this approach is the adaptation of scattering junctions to a B-format context and the use of B-format spatial image transformation techniques.