On the indoor beamformer design with reverberation

Zhibao Li, Ka Fai Cedric Yiu, Sven Nordholm

Research output: Journal article publicationJournal articleAcademic researchpeer-review

7 Citations (Scopus)

Abstract

Beamforming remains to be an important technique for signal enhancement. For applications in open space, the transfer function describing waves propagation has an explicit expression, which can be employed for beamformer design. However, the function becomes very complex in an indoor environment due to the effects of reverberation. In this paper, this problem is discussed. A method based on the image source method (ISM) is applied to model the room impulse responses (RIRs), which will act as the transfer function between source and sensor. The indoor beamformer design problem is formulated as a minimax optimization problem. We propose and study several optimization models based on the L1-norm to design the beamformer. We found that it is advantageous to separate early and late reverberations in the design process and better designs can be achieved. Several numerical experiments are presented using both simulated data and real recordings to evaluate the proposed methods.
Original languageEnglish
Article number2327299
Pages (from-to)1225-1235
Number of pages11
JournalIEEE Transactions on Audio, Speech and Language Processing
Volume22
Issue number8
DOIs
Publication statusPublished - 1 Aug 2014

Keywords

  • Beamformer design
  • Dereverberation
  • Reverberation
  • Signal enhancement

ASJC Scopus subject areas

  • Acoustics and Ultrasonics
  • Electrical and Electronic Engineering

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