Placement design of microphone arrays in near-field broadband beamformers

Zhi Guo Feng, Ka Fai Cedric Yiu, Sven Erik Nordholm

Research output: Journal article publicationJournal articleAcademic researchpeer-review

34 Citations (Scopus)


In beamformer design, the microphone array configuration is often prescribed and the filter coefficients are varied in order to improve on the noise reduction performance. However, the positions of the microphone elements play an important role in the overall performance and should be optimized at the same time. This problem is addressed in this paper. In order to understand the performance improvement through location movements, we first look at the design with an infinite filter length, which gives the performance limit for finite filter length designs. When the filter length is finite, both the filter coefficients and the placement of the microphone array are decision variables. In both situations, the problems can be formulated as constrained optimization problems. As the filter length increases, we show that the performance converges quickly to the limit. For illustration, two numerical examples are solved. Comparing with several popular configurations, we show that the performance of the optimized configuration improves significantly.
Original languageEnglish
Article number6096453
Pages (from-to)1195-1204
Number of pages10
JournalIEEE Transactions on Signal Processing
Issue number3
Publication statusPublished - 1 Mar 2012


  • Beamformer
  • microphone array
  • placement design

ASJC Scopus subject areas

  • Signal Processing
  • Electrical and Electronic Engineering


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