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1998

Noisy speech enhancement using discrete cosine transform

9 years 3 months ago
Noisy speech enhancement using discrete cosine transform
This paper illustrates the advantages of using the Discrete Cosine Transform (DCT) as compared to the standard Discrete Fourier Transform (DFT) for the purpose of removing noise embedded in a speech signal. The derivation of the Minimum Mean Square Error (MMSE) ®lter based on the statistical modelling of the DCT coecients is shown. Also shown is the derivation of an over-attenuation factor based on the fact that speech energy is not always present in the noisy signal at all times or in all coecients. This over-attenuation factor is useful in suppressing any musical residual noise which may be present. The proposed methods are evaluated against the noise reduction ®lter proposed by Y. Ephraim and D. Malah (1984), using both Gaussian distributed white noise as well as recorded fan noise, with favourable results. Ó 1998 Elsevier Science B.V. All rights reserved. ReÂsume Cet article illustre les avantages apportes par l'utilisation de la Transformation Cosinus Discrete (D...
Ing Yann Soon, Soo Ngee Koh, Chai Kiat Yeo
Added 23 Dec 2010
Updated 23 Dec 2010
Type Journal
Year 1998
Where SPEECH
Authors Ing Yann Soon, Soo Ngee Koh, Chai Kiat Yeo
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