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Dynamic Audio Reproduction with Linear Loudspeaker Arrays

This report describes a dynamic, listener-adaptive, audio reproduction filtering system that allows a listener to move freely in front of a loudspeaker array without degrading perception. The proposed filters allow the delivery of two independent personalized signals to a pair of listeners or a binaural signal to 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. The filter that controls the equalization of the acoustic pressure at the listener’s ears is an FIR filter that can be adjusted in real time. The measured personal audio performance shows that it is possible to obtain about 30 dB of crosstalk cancellation for two listeners between 300 Hz and 3 kHz. For binaural audio reproduction, the crosstalk cancellation between both of the listener’s ears is above 10 dB at 1 kHz and grows to 20 dB at 8 kHz.

JAES Volume 67 Issue 4 pp. 190-200; April 2019
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AES - Audio Engineering Society