Callaghan Innovation Research Papers

Back to Research Papers

TitleWavefield analysis over large areas using distributed higher order microphones
Publication TypeJournal Article
Year of Publication2014
AuthorsSamarasinghe, P., Abhayapala T., and Poletti M.
JournalIEEE Transactions on Audio, Speech and Language Processing
Pagination647 - 658
Date Published2014
ISSN15587916 (ISSN)
KeywordsAcoustic signal processing, Array configurations, Array signal processing, Audio recordings, Condition numbers, Design and analysis, Harmonic analysis, Matrix algebra, Microphone arrays, Microphones, Mode-matching solutions, Number theory, Signal processing, Simulation example, Translation matrices, White noise
AbstractSuccessful recording of large spatial soundfields is a prevailing challenge in acoustic signal processing due to the enormous numbers of microphones required. This paper presents the design and analysis of an array of higher order microphones that uses 2D wavefield translation to provide a mode matching solution to the height invariant recording problem. It is shown that the use of Mth order microphones significantly reduces the number of microphone units by a factor of 1/ (2M + 1) at the expense of increased complexity at each microphone unit. Robustness of the proposed array is also analyzed based on the condition number of the translation matrix while discussing array configurations that result in low condition numbers. The white-noise gain (WNG) of the array is then derived to verify that improved WNG can be achieved when the translation matrix is well conditioned. Furthermore, the array's performance is studied for interior soundfield recording as well as exterior soundfield recording using appropriate simulation examples. © 2014 IEEE.

Back to top