Controlling Elevation and Azimuth Beamwidths with Concentric Circular Microphone Arrays

Rajib Sharma, Israel Cohen, Baruch Berdugo

Research output: Contribution to journalArticlepeer-review


Solutions for frequency-invariant or constant-beamwidth beamforming with concentric circular arrays (CCAs) generally control only the azimuth-beampattern. This work introduces a beamforming methodology, which instead of designing a fixed beamwidth across the spectrum, maximizes the directivity-factor under the constraint that the beamwidth is greater than or equal to a pre-defined target-beamwidth, in both the elevation and the azimuth. The principal idea lies in dynamically weighting the microphones of the CCA based on two factors-(i) their corresponding ring number or radius, and (ii) their alignment with the signal-path. The parameters controlling the weights are determined using a modified gradient-descent algorithm. Experimental results show the flexibility and advantage of the proposed methodology over state-of-the-art methods.

Original languageEnglish
Article number9399797
Pages (from-to)1491-1502
Number of pages12
JournalIEEE/ACM Transactions on Audio Speech and Language Processing
StatePublished - 2021


  • Concentric circular array
  • constant-beamwidth beamforming
  • directivity-factor
  • frequency-invariant beamforming
  • microphone array
  • white-noise-gain

All Science Journal Classification (ASJC) codes

  • Computer Science (miscellaneous)
  • Acoustics and Ultrasonics
  • Computational Mathematics
  • Electrical and Electronic Engineering


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