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Evaluation of the Circular Harmonics Decomposition for WDAF-based Active Listening Room Compensation

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The underlying theory of most massive multichannel spatial sound reproduction systems assumes ideal, e. g. free-field propagation characteristics in the listening room. The effects of non-ideal listening rooms can be reduced by active listening room compensation. A very efficient realization of such a system is given by wave-domain adaptive filtering. Here spatio-temporal signal transformations are used to transform the adaptation problem into a highly reduced representation. However, the optimal transformation depends on the acoustic properties of the listening room, which are in general not known a-priori. Practical implementations therefore use listening room independent transformations. This paper evaluates the circular harmonics decomposition as wave domain transformation. Its favorable properties are demonstrated by simulations and laboratory measurements.

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