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Optimizing the similarity of loudspeaker: Room responses in multiple listening positions
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signals and Systems Group.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signals and Systems Group.
2016 (English)In: IEEE Transactions on Audio, Speech, and Language Processing, ISSN 1558-7916, E-ISSN 1558-7924, Vol. 24, no 2, 340-353 p.Article in journal (Refereed) Published
Abstract [en]

A shortcoming of multichannel sound reproduction standards, such as stereo or 5.1 surround, is their incompatibility with multiple off-axis listening positions. Accurate reproduction of virtual sound sources can only be experienced in the sweet spot, which is located equidistant to the loudspeakers. We here present a novel methodology to compensate audio systems such that the channel similarity is optimized in several listening positions simultaneously. To that end we propose a novel MIMO personal audio filter design framework based on feed-forward control. By proper design choices, filters that successfully compensate for multiple offaxis positions and irregularities in the frequency sum responses are obtained. The design choices include allpass filters with appropriate phase shifts as target for each listening position in addition to a weighted similarity requirement. Evaluations based on measurements of two four-channel car audio systems show that the proposed method significantly improves timbral sound reproduction and phantom center reproduction in several listening positions simultaneously.

Place, publisher, year, edition, pages
2016. Vol. 24, no 2, 340-353 p.
Keyword [en]
Acoustic signal processing; audio systems; equalizers; loudspeakers; multiple sweet spots; psychoacoustics; virtual center
National Category
Engineering and Technology
Research subject
Electrical Engineering with specialization in Signal Processing
Identifiers
URN: urn:nbn:se:uu:diva-267311DOI: 10.1109/TASLP.2015.2496156ISI: 000367950900007OAI: oai:DiVA.org:uu-267311DiVA: diva2:872732
Funder
Knut and Alice Wallenberg Foundation, KAW 2006.0152
Available from: 2015-11-20 Created: 2015-11-20 Last updated: 2017-12-01Bibliographically approved

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Bahne, AdrianAhlén, Anders

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CiteExportLink to record
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