Dynamic Audio Reproduction with Linear Loudspeaker Arrays

Abstract

This paper describes the creation of dynamic filters for listener-adaptive reproduction with loudspeaker arrays. The proposed filters allow the delivery of two independent personalized signals to a pair of listeners or a binaural signal for a single listener. The filters are modified in real-time according to the listener position. This is obtained by expressing the impulse response of each filter as a network of variable gain-delay elements that are modified so that the filters adapt the reproduction to the listener position, assuming that each loudspeaker behaves as a point-source free-field monopole. The paper introduces the filter formulation, together with the signal processing scheme for a real-time implementation and measured performance for a listener-adaptive 28 loudspeaker linear array using an optical head-tracking system.