Sound zone control with fixed acoustic contrast and simultaneous tracking of acoustic transfer functions

Meiling Hu; Li Shi; Haishan Zou; Mads Græsbøll Christensen; Jing Lu

doi:10.1121/10.0017977

Sound zone control with fixed acoustic contrast and simultaneous tracking of acoustic transfer functions

J Acoust Soc Am. 2023 May 1;153(5):2538. doi: 10.1121/10.0017977.

Authors

Meiling Hu¹, Li Shi¹, Haishan Zou¹, Mads Græsbøll Christensen², Jing Lu¹

Affiliations

¹ Key Laboratory of Modern Acoustics, Institute of Acoustics, Nanjing University, Nanjing 210093, China.
² Audio Analysis Lab, CREATE, Aalborg University, 9000 Aalborg, Denmark.

PMID: 37125837
DOI: 10.1121/10.0017977

Abstract

As environmental changes are inevitable, online algorithms that can track the variation of acoustic transfer functions are preferred in sound zone control (SZC) systems. In this paper, it is found that for the time domain SZC, the nonuniqueness problem caused by the coupling in multichannel transfer function modeling can be solved with time-varying control filters. To keep a stable acoustic contrast (AC) performance irrespective of environmental changes and also avoid the extreme distortion introduced by maximizing the AC in the time domain, the objective of maintaining a desired level of AC is used and an adaptive control algorithm is developed. The simulations validate that the proposed method tracks the environmental changes and adapts the control filters to give a stable AC performance.