A hybrid design of beamformers for voice control devices

Ka Fai Cedric Yiu, K. Y. Chan, N. Grbić, S. Nordholm

Research output: Journal article publicationJournal articleAcademic researchpeer-review

2 Citations (Scopus)


In this paper, a new approach to designing beamformers for voice control device is proposed. It is well-known that under a strong near-field noise with low signal-to-noise ratios (SNR), the performance of speech recognition is deteriorated significantly. However, designing the beamformer for enhancing speech recognition is a slow process and might not be adapted easily to the changing noise environment. In order to lower the complexity of the design, we intend to exploit the combination of existing optimal beamformer designs, which can be implemented in parallel. These include the least-squares technique and the signal-to- noise ratio maximization technique. We show here that for a given pre-trained speech recognizer and for a finite set of speech commands, neither method has a satisfactory performance in speech recognition accuracy under very low SNRs. However, since the two techniques have different characteristics in speech distortion and noise suppression, we show that it is possible to enhance the speech recognition accuracy by combining these two optimal designs.
Original languageEnglish
Pages (from-to)533-544
Number of pages12
JournalPacific Journal of Optimization
Issue number3
Publication statusPublished - 1 Jul 2012


  • Beamformer
  • Microphone array
  • Multi-channel filter
  • Noise reduction
  • Signal enhancement
  • Speech recognition

ASJC Scopus subject areas

  • Control and Optimization
  • Computational Mathematics
  • Applied Mathematics


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