Reducing modal error propagation through correcting mismatched microphone gains using rapid

Noman Akbar, Glenn Dickins, Mark R.P. Thomas, Prasanga Samarasinghe, Thushara Abhayapala

    Research output: Contribution to journalConference articlepeer-review

    2 Citations (Scopus)


    Microphone array calibration is required to accurately capture the information in an audio source recording. Existing calibration methods require expensive hardware and setup procedures to compute filters for correcting microphone responses. Typically, such methods struggle to extend measurement accuracy to low frequencies. As a result, the error due to microphone gain mismatch propagates to all the modes in the spherical harmonic domain representation of a signal. Several existing algorithms use modal representation of sound and error propagation in modes fundamentally limits the performance of such algorithms. A method for reducing the error propagation in modes by correcting the mismatched microphone gains is proposed, where RAndom PerturbatIons for Diffuse-field (RAPID) is used to design filters for correcting the mismatch. Experimental results show that the directivity pattern of a calibrated spherical microphone array using RAPID provides up to 6dB improvement in the front back factor.

    Original languageEnglish
    Pages (from-to)811-814
    Number of pages4
    JournalProceedings - ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing
    Publication statusPublished - 2021
    Event2021 IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP 2021 - Virtual, Toronto, Canada
    Duration: 6 Jun 202111 Jun 2021


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