An MLS coherence function and its performance in measurements on time-varying systems

Jiyuan Liu, Finn Jacobsen

    Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review


    A new MLS coherence function has been developed and tested in various room acoustic measurements. The new measure, which takes values between zero and unity just as the ordinary coherence, can be used only if averaging over several periods of the MLS signal is carried out. It indicates possible contamination by extraneous noise in the same manner as the the ordinary coherence function does in measurements with FFT analysers. It is also very sensitive to disturbances such as reflections caused by moving surfaces during the measurement. Very weak time-variance effects caused by a small change in the temperature are also reflected in reduced coherence.
    Original languageEnglish
    Title of host publicationProceedings of Sixth International Congress on Sound and Vibration
    Place of PublicationLyngby
    PublisherDepartment of Acoustic Technology, Technical University of Denmark
    Publication date1999
    Publication statusPublished - 1999
    Event6th International Congress on Sound and Vibration - Kgs. Lyngby, Denmark
    Duration: 5 Jul 19998 Jul 1999
    Conference number: 6


    Conference6th International Congress on Sound and Vibration
    CityKgs. Lyngby

    Cite this