MULTICHANNEL FILTER FOR ENHANCEMENT OF SPEECH BLOCKS

Ivandro Sanches

Abstract

This work presents the concepts and the achieved results of a proposed microphone array algorithm based on multi-dimensional Wiener filter developed to work on blocks of speech. The inputs to the algorithm are two correlation matrices: the correlation matrix of the background noise affecting the desired signal and the correlation matrix of the signal affected by the noise. Experiments show that improvements of more than 12dB on signal to noise ratio can be achieved when comparing the filtered signals with one of the microphone array channels. In order to save computational load, the input signal is processed in blocks of a specified size and a technique is proposed to reduce blocking effects on the output filtered signal. It will be shown that practically there are no blocking effects. It is also shown that the technique is independent of the array physical configuration.

References

  1. Doclo, S. and Moonem, M. (2001). Microphone Arrays: Signal Processing Techniques and Applications, chapter GSVD-Based Optimal Filtering for MultiMicrophone Speech Enhancement. Springer-Verlag, Berlin.
  2. Florencio, D., and Malvar, H. (2001). Multichannel filtering for optimum noise reduction microphone arrays. In Proc. ICASSP, volume 1, pages 197-200.
  3. NIST, National Institute of Standards and Technology, http://www.nist.gov/speech/tools/index.htm, accessed January 10, 2007.
  4. Spriet, A., Moonen, M., and Wouters, J. (2005). Robustness analysis of multichannel Wiener filtering and generalized sidelobe cancellation for multimicrophone noise reduction in hearing aid applications. In IEEE Trans. on Speech and Audio Processing, volume 13, pages 487-503.
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Paper Citation


in Harvard Style

Sanches I. (2007). MULTICHANNEL FILTER FOR ENHANCEMENT OF SPEECH BLOCKS . In Proceedings of the Fourth International Conference on Informatics in Control, Automation and Robotics - Volume 3: ICINCO, ISBN 978-972-8865-84-9, pages 272-276. DOI: 10.5220/0001625202720276


in Bibtex Style

@conference{icinco07,
author={Ivandro Sanches},
title={MULTICHANNEL FILTER FOR ENHANCEMENT OF SPEECH BLOCKS},
booktitle={Proceedings of the Fourth International Conference on Informatics in Control, Automation and Robotics - Volume 3: ICINCO,},
year={2007},
pages={272-276},
publisher={SciTePress},
organization={INSTICC},
doi={10.5220/0001625202720276},
isbn={978-972-8865-84-9},
}


in EndNote Style

TY - CONF
JO - Proceedings of the Fourth International Conference on Informatics in Control, Automation and Robotics - Volume 3: ICINCO,
TI - MULTICHANNEL FILTER FOR ENHANCEMENT OF SPEECH BLOCKS
SN - 978-972-8865-84-9
AU - Sanches I.
PY - 2007
SP - 272
EP - 276
DO - 10.5220/0001625202720276