Performance of low-frequency sound zones with very fast room impulse response measurements

José Cadavid, Martin Bo Møller, Christian Sejer Pedersen, Søren Bech, Toon van Waterschoot, Jan Østergaard

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Sound zone methods aim to control the sound field produced by an array of loudspeakers to render a given audio content in specific areas while making it almost inaudible in others. At low frequencies, control filters are based on information of the electro-acoustical path between loudspeakers and listening areas, contained in the room impulse responses (RIRs). This information can be acquired wirelessly through ubiquitous networks of microphones. In that case and for real-time applications in general, short acquisition and processing times are critical. In addition, limiting the amount of data that should be retrieved and processed can also reduce computational demands. Furthermore, such a framework would enable fast adaptation of control filters in changing acoustic environments. This work explores reducing the amount of time and information required to compute control filters when rendering and updating low-frequency sound zones. Using real RIR measurements, it is demonstrated that in some standard acoustic rooms, acquisition times on the order of a few hundred milliseconds are sufficient for accurately rendering sound zones. Moreover, an additional amount of information can be removed from the acquired RIRs without degrading the performance.

Original languageEnglish
JournalThe Journal of the Acoustical Society of America
Issue number1
Pages (from-to)757-768
Number of pages12
Publication statusPublished - 29 Jan 2024


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