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

På svenska

Author

  • Jan-Mark de Haan
  • Nedelko Grbic
  • Ingvar Claesson
  • Sven Nordholm

Summary, in English

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.

Publishing year

2002

Language

English

Pages

1173-1176

Publication/Series

IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP), 2002

Volume

2

Document type

Conference paper

Publisher

IEEE - Institute of Electrical and Electronics Engineers Inc.

Topic

  • Signal Processing

Conference name

IEEE International Conference on Acoustics, Speech and Signal Processing, 2002

Conference date

2002-05-13 - 2002-05-17

Conference place

Orlando, FL, United States

Status

Published

ISBN/ISSN/Other

  • ISBN: 0-7803-7402-9