Object-Based Reverberation Encoding from First-Order Ambisonic RIRs

Recent work on a reverberant spatial audio object (RSAO) encoded spatial room impulse responses(RIRs) as object-based metadata which can be synthesized in an object-based renderer. Encodingreverberation into metadata presents new opportunities for end users to interact with and personalizereverberant content. The RSAO models an RIR as a set of early reections together with a latereverberation filter. Previous work to encode the RSAO parameters was based on recordings madewith a dense array of omnidirectional microphones. This paper describes RSAO parameterization fromfirst-order Ambisonic (B-Format) RIRs, making the RSAO compatible with existing spatial reverblibraries. The object-based implementation achieves reverberation time, early decay time, clarity andinteraural cross-correlation similar to direct Ambisonic rendering of 13 test RIRs.