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Algorithms 2009, 2(1), 550-564; doi:10.3390/a2010550
Article

Multi-Band Spectral Subtraction Method for Electrolarynx Speech Enhancement

1, 2
, 1,*  and 1
1 Key Laboratory of Biomedical Information Engineering of Ministry of Education, Department of Biomedical Engineering, School of Life Science and Technology, Xi’an Jiaotong University, Xi’an 710049, P.R. China 2 Department of Biomedical Engineering, The Fourth Military Medical University, Xi’an 710032, P.R. China
* Author to whom correspondence should be addressed.
Received: 30 October 2008 / Revised: 6 February 2009 / Accepted: 25 February 2009 / Published: 13 March 2009
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Abstract

Although the electrolarynx (EL) provides an important means of voice reconstruction for patients who lose their vocal cords by laryngectomies, the radiated noise and additive environment noise reduce the intelligibility of the resulting EL speech. This paper proposes an improved spectrum subtract algorithm by taking into account the non-uniform effect of colored noise on the spectrum of EL speech. Since the over-subtraction factor of each frequency band can be adjusted in the enhancement process, a better noise reduction effect was obtained and the perceptually annoying musical noise was efficiently reduced, as compared to other standard speech enhancement algorithms.
Keywords: Electrolarynx; multi-band; speech enhancement; spectral subtraction method Electrolarynx; multi-band; speech enhancement; spectral subtraction method
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Li, S.; Wan, M.; Wang, S. Multi-Band Spectral Subtraction Method for Electrolarynx Speech Enhancement. Algorithms 2009, 2, 550-564.

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