Assessing the Influence of Loudspeaker Driver Nonlinear Distortion on Personal Sound Zones

Xiaohui Ma, Patrick J. Hegarty, Jan Abildgaard Pedersen, Lars G. Johansen, Jakob Juul Larsen

    Research output: Contribution to book/anthology/report/proceedingArticle in proceedingsResearchpeer-review

    Abstract

    The impacts of loudspeaker nonlinear distortion on sound zones are measured in an anechoic chamber. Two loudspeaker arrays, each with four equally spaced drivers, are used to generate two sound zones, one bright and one dark. Acoustic contrast control (ACC) and planarity control (PC) are employed as control methods. A 250 Hz sinusoidal signal is used as stimulus, and the target sound pressure level for the bright zone is 82 dB. Simulations based on measured transfer functions give acoustic contrast of 43.1 dB between the two zones whereas the experimentally measured acoustic contrast is only 32.1 dB for ACC, and 29.3 dB for PC. Nonlinear distortion contributes to this contrast loss according to spectrum measurements. Experiments also reveal that the nonlinear distortion can be controlled through regularization of the control effort; the regularization parameter has an optimal value which can balance the acoustic contrast and nonlinear distortion.

    Original languageEnglish
    Title of host publication142nd Audio Engineering Society International Convention 2017
    Number of pages8
    Volume2
    PublisherAudio Engineering Society
    Publication date11 May 2017
    Pages1019-1026
    Article number9807
    ISBN (Electronic) 978-1-5108-4352-3
    Publication statusPublished - 11 May 2017
    Event142nd Audio Engineering Society
    International Convention 2017
    - Maritim Hotel Berlin, Berlin, Germany
    Duration: 20 May 201723 May 2017
    http://www.aes.org/events/142/

    Conference

    Conference142nd Audio Engineering Society
    International Convention 2017
    LocationMaritim Hotel Berlin
    Country/TerritoryGermany
    CityBerlin
    Period20/05/201723/05/2017
    Internet address

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