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Blind subband beamforming with time-delay constraints for moving source speech enhancement

Yermeche, Zohra; Grbic, Nedelko LU and Claesson, Ingvar LU (2007) In IEEE Transactions on Audio, Speech, and Language Processing 15(8). p.2360-2372
Abstract
A new robust microphone array method to enhance speech signals generated by a moving person in a noisy environment is presented. This blind approach is based on a two-stage scheme. First, a subband time-delay estimation method is used to localize the dominant speech source. The second stage involves speech enhancement, based on the acquired spatial information, by means of a soft-constrained subband beamformer. The novelty of the proposed method involves considering the spatial spreading of the sound source as equivalent to a time-delay spreading, thus, allowing for the estimated intersensor time-delays to be directly used in the beamforming operations. In comparison to previous approaches, this new method requires no special array... (More)
A new robust microphone array method to enhance speech signals generated by a moving person in a noisy environment is presented. This blind approach is based on a two-stage scheme. First, a subband time-delay estimation method is used to localize the dominant speech source. The second stage involves speech enhancement, based on the acquired spatial information, by means of a soft-constrained subband beamformer. The novelty of the proposed method involves considering the spatial spreading of the sound source as equivalent to a time-delay spreading, thus, allowing for the estimated intersensor time-delays to be directly used in the beamforming operations. In comparison to previous approaches, this new method requires no special array geometry, knowledge of the array manifold, or acquisition of calibration data to adapt the array weights. Furthermore, such a scheme allows for the beamformer to efficiently adapt to speaker movement. The robustness of the time-delay estimation of speech signals in high noise levels is improved by making use of the non-Gaussian nature of speech trough a subband Kurtosis-weighted structure. Evaluation in a real environment with a moving speaker shows promising results, with suppression levels of up to 16 dB for background noise and interfering (speech) signals, associated to a relatively small effect of speech distortion. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
IEEE Transactions on Audio, Speech, and Language Processing
volume
15
issue
8
pages
13 pages
publisher
IEEE--Institute of Electrical and Electronics Engineers Inc.
external identifiers
  • Scopus:64149114799
ISSN
1558-7916
DOI
10.1109/TASL.2007.903309
language
English
LU publication?
yes
id
5b9d148b-1aca-4ae3-aff6-dd6c865ee210
date added to LUP
2016-06-23 14:07:11
date last changed
2016-10-13 05:10:44
@misc{5b9d148b-1aca-4ae3-aff6-dd6c865ee210,
  abstract     = {A new robust microphone array method to enhance speech signals generated by a moving person in a noisy environment is presented. This blind approach is based on a two-stage scheme. First, a subband time-delay estimation method is used to localize the dominant speech source. The second stage involves speech enhancement, based on the acquired spatial information, by means of a soft-constrained subband beamformer. The novelty of the proposed method involves considering the spatial spreading of the sound source as equivalent to a time-delay spreading, thus, allowing for the estimated intersensor time-delays to be directly used in the beamforming operations. In comparison to previous approaches, this new method requires no special array geometry, knowledge of the array manifold, or acquisition of calibration data to adapt the array weights. Furthermore, such a scheme allows for the beamformer to efficiently adapt to speaker movement. The robustness of the time-delay estimation of speech signals in high noise levels is improved by making use of the non-Gaussian nature of speech trough a subband Kurtosis-weighted structure. Evaluation in a real environment with a moving speaker shows promising results, with suppression levels of up to 16 dB for background noise and interfering (speech) signals, associated to a relatively small effect of speech distortion.},
  author       = {Yermeche, Zohra and Grbic, Nedelko and Claesson, Ingvar},
  issn         = {1558-7916},
  language     = {eng},
  number       = {8},
  pages        = {2360--2372},
  publisher    = {ARRAY(0xadeeb30)},
  series       = {IEEE Transactions on Audio, Speech, and Language Processing},
  title        = {Blind subband beamforming with time-delay constraints for moving source speech enhancement},
  url          = {http://dx.doi.org/10.1109/TASL.2007.903309},
  volume       = {15},
  year         = {2007},
}