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The reproduction of acoustics is an important aspect of the preservation ofcultural heritage. A common approach is to capture an impulse response in ahall and auralize it by convolving an input signal with the measuredreverberant response. For immersive applications, it is typical to acquirespatial impulse responses using a spherical microphone array to capture thereverberant sound field. While this allows a listener to freely rotate theirhead from the captured location during reproduction, delicate considerationsmust be made to allow a full six degrees of freedom auralization. Furthermore,the computational cost of convolution with a high-order Ambisonics impulseresponse remains prohibitively expensive for current real-time applications,where most of the resources are dedicated towards rendering graphics. For thisreason, simplifications are often made in the reproduction of reverberation,such as using a uniform decay around the listener. However, recent work hashighlighted the importance of directional characteristics in the latereverberant sound field and more efficient reproduction methods have beendeveloped. In this article, we propose a framework that extracts directionaldecay properties from a set of captured spatial impulse responses tocharacterize a directional feedback delay network. For this purpose, a data setwas acquired in the main auditorium of the Finnish National Opera and Ballet inHelsinki from multiple source-listener positions, in order to analyze theanisotropic characteristics of this auditorium and illustrate the proposedreproduction framework.

A Method for Capturing and Reproducing Directional Reverberation in Six Degrees of Freedom