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Performance limits in subband beamforming

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Author

  • Sven Nordholm
  • Ingvar Claesson
  • Nedelko Grbic

Summary, in English


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This paper analyzes subband beamforming schemes mainly aimed at speech enhancement and acoustic echo suppression applications such as hands-free telephony for both mobile and office environments, Internet telephony and video conferencing. Analytical descriptions of both causal finite-length and noncausal infinite-length subband microphone array structures are given. More specifically, this paper compares finite Wiener filter performance with the noncausal Wiener solution, giving a comprehensive theoretical suppression limit. It is shown that even short filters will yield a good approximation of the infinite solution, provided that the element spacing and temporal sampling is matched to the frequency band of interest. Typically, 10-20 FIR taps are sufficient in each subband.

Publishing year

2003

Language

English

Pages

193-203

Publication/Series

IEEE/ACM Transactions on Audio, Speech, and Language Processing

Volume

11

Issue

3

Document type

Journal article

Publisher

Piscataway, NJ : Institute of Electrical and Electronics Engineers

Topic

  • Electrical Engineering, Electronic Engineering, Information Engineering

Status

Published

ISBN/ISSN/Other

  • ISSN: 2329-9290