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Optimal and Adaptive Microphone Arrays for Speech Input in Automobiles

Nordholm, Sven; Claesson, Ingvar LU and Grbic, Nedelko LU (2001) In Digital Signal Processing p.307-329
Abstract
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... (More)
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. (Less)
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author
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
in
Digital Signal Processing
editor
Brandstein, Michael and Ward , Darren
pages
23 pages
publisher
Springer Berlin Heidelberg
ISSN
1612-1457
ISBN
978-3-540-41953-2
978-3-642-07547-6
DOI
10.1007/978-3-662-04619-7_14
language
English
LU publication?
no
id
f8c47408-6271-447b-b403-6be62074201f
date added to LUP
2016-06-23 17:26:04
date last changed
2016-06-30 09:29:02
@misc{f8c47408-6271-447b-b403-6be62074201f,
  abstract     = {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.},
  author       = {Nordholm, Sven and Claesson, Ingvar and Grbic, Nedelko},
  editor       = {Brandstein, Michael  and Ward , Darren },
  isbn         = {978-3-540-41953-2},
  issn         = {1612-1457},
  language     = {eng},
  pages        = {307--329},
  publisher    = {ARRAY(0xb0c6408)},
  series       = {Digital Signal Processing },
  title        = {Optimal and Adaptive Microphone Arrays for Speech Input in Automobiles},
  url          = {http://dx.doi.org/10.1007/978-3-662-04619-7_14},
  year         = {2001},
}