Advanced

Design and Evaluation of nonuniform DFT filter banks in Subband Microphone Arrays

de Haan, Jan-Mark; Grbic, Nedelko LU ; Claesson, Ingvar LU and Nordholm, Sven (2002) IEEE International Conference on Acoustics, Speech and Signal Processing, 2002 In IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP), 2002 2. p.1173-1176
Abstract
This paper presents a method for the design of nonuniform DFT filter banks for subband beamforming. Filter banks designed with the method are evaluated in subband beamforming in a real-world microphone array application. Different source positions in array applications give rise to different signal delays, which means that adaptive beamformers in the subbands alter the phase information of the subband signals in order to extract the source from a noisy background. Phase alterations in the subbands lead to signal degradations when perfect reconstruction filter banks are used for the subband decomposition and reconstruction. The objective of the proposed design is to minimize the magnitude of all aliasing components individually, such that... (More)
This paper presents a method for the design of nonuniform DFT filter banks for subband beamforming. Filter banks designed with the method are evaluated in subband beamforming in a real-world microphone array application. Different source positions in array applications give rise to different signal delays, which means that adaptive beamformers in the subbands alter the phase information of the subband signals in order to extract the source from a noisy background. Phase alterations in the subbands lead to signal degradations when perfect reconstruction filter banks are used for the subband decomposition and reconstruction. The objective of the proposed design is to minimize the magnitude of all aliasing components individually, such that aliasing distortion is minimized although phase alterations occur in the subbands. The proposed method is evaluated in a car hands-free mobile telephony environment with real speech signals and the results show that the performance can be increased by several decibel when using nonuniform filter banks instead of uniform filterbanks while maintaining the length of the subband filters. (Less)
Please use this url to cite or link to this publication:
author
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
in
IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP), 2002
volume
2
pages
4 pages
publisher
IEEE--Institute of Electrical and Electronics Engineers Inc.
conference name
IEEE International Conference on Acoustics, Speech and Signal Processing, 2002
external identifiers
  • scopus:0036296035
ISBN
0-7803-7402-9
DOI
10.1109/ICASSP.2002.5744009
language
English
LU publication?
no
id
bc714638-8f72-419e-92ac-efdcd7a05c27
date added to LUP
2016-06-23 15:21:24
date last changed
2017-01-01 08:29:01
@inproceedings{bc714638-8f72-419e-92ac-efdcd7a05c27,
  abstract     = {This paper presents a method for the design of nonuniform DFT filter banks for subband beamforming. Filter banks designed with the method are evaluated in subband beamforming in a real-world microphone array application. Different source positions in array applications give rise to different signal delays, which means that adaptive beamformers in the subbands alter the phase information of the subband signals in order to extract the source from a noisy background. Phase alterations in the subbands lead to signal degradations when perfect reconstruction filter banks are used for the subband decomposition and reconstruction. The objective of the proposed design is to minimize the magnitude of all aliasing components individually, such that aliasing distortion is minimized although phase alterations occur in the subbands. The proposed method is evaluated in a car hands-free mobile telephony environment with real speech signals and the results show that the performance can be increased by several decibel when using nonuniform filter banks instead of uniform filterbanks while maintaining the length of the subband filters.},
  author       = {de Haan, Jan-Mark and Grbic, Nedelko and Claesson, Ingvar and Nordholm, Sven},
  booktitle    = {IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP), 2002 },
  isbn         = {0-7803-7402-9},
  language     = {eng},
  pages        = {1173--1176},
  publisher    = {IEEE--Institute of Electrical and Electronics Engineers Inc.},
  title        = {Design and Evaluation of nonuniform DFT filter banks in Subband Microphone Arrays},
  url          = {http://dx.doi.org/10.1109/ICASSP.2002.5744009 },
  volume       = {2},
  year         = {2002},
}