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Optimal and Adaptive Microphone Arrays for Speech Input in Automobiles

På svenska

Author

  • Sven Nordholm
  • Ingvar Claesson
  • Nedelko Grbic

Editor

  • Michael Brandstein
  • Darren Ward

Summary, in English

In this chapter, speech enhancement and echo cancellation for hands-free mobile telephony are discussed. A number of microphone array methods have been tested and results from car measurements are given. Traditional methods such as linearly constrained beamforming and generalized sidelobe cancelers are discussed as well as array gain optimization methods. An in situ calibrated method which gives an overall improved performance is also presented. Algorithms such as Least-Squares (LS) and Normalized-Least-Mean-Squares (NLMS) are used to find optimal weights. Improved performance using an LS-method is shown, but at the cost of increased numerical complexity limiting its implementation in real-time applications. By introducing subband processing this issue can be avoided. The results show a noise suppression of approximately 18 dB and hands-free loudspeaker suppression of the same order.

Publishing year

2001

Language

English

Pages

307-329

Publication/Series

Digital Signal Processing

Document type

Book chapter

Publisher

Springer

Topic

  • Signal Processing

Status

Published

ISBN/ISSN/Other

  • ISSN: 1612-1457
  • ISBN: 978-3-662-04619-7
  • ISBN: 978-3-540-41953-2
  • ISBN: 978-3-642-07547-6