Frequency dependent regularization of a mixed-order Ambisonics encoding system using psychoacoustically motivated metrics

Tobias Weller*, Jörg M. Buchholz, Chris Oreinos

*Corresponding author for this work

    Research output: Chapter in Book/Report/Conference proceedingConference proceeding contributionpeer-review

    3 Citations (Scopus)

    Abstract

    In mixed-order Ambisonics (MOA) encoding the right choice of the regularization parameter λ is crucial to the reproduction quality of the system. The choice of λ is a trade-off between low microphone noise amplification and high directivity. Commonly used performance metrics are not suited to determine an optimum λ(f)-curve due to their limited psychoacoustical relevance. Therefore, it is proposed here to use two perceptually motivated metrics that consider the reproduced signals at the listener's ear to quantify the reproduction error and the audibility of the total microphone noise. Regularization was then optimized towards previously defined requirements on both of these metrics separately. The results showed that at frequencies below 500Hz both requirements can be met. Above this frequency one or both of the requirements have to be relaxed in order to find a suitable λ(f).

    Original languageEnglish
    Title of host publication55th AES International Conference 2014
    Subtitle of host publicationSpatial Audio
    EditorsTapio Lokki
    Place of PublicationNew York
    PublisherAudio Engineering Society
    Pages1-8
    Number of pages8
    ISBN (Print)9781634397599
    Publication statusPublished - Aug 2014
    EventAES 55th International Conference: Spatial Audio - Helsinki, Finland
    Duration: 27 Aug 201429 Aug 2014

    Other

    OtherAES 55th International Conference: Spatial Audio
    CountryFinland
    CityHelsinki
    Period27/08/1429/08/14

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