Speech Enhancement by MAP Spectral Amplitude Estimation using a Super-Gaussian Speech Model

Authors:

Lotter, T. ,  Vary, P.

Journal:

(EURASIP ASP)

Volume:

2005

Page(s):

1110-1126

number:

7

Date:

May. 2005

Language:

English

Abstract

This contribution presents two spectral amplitude estimators for acoustical background noise suppression based on maximum a posteriori estimation and super-Gaussian statistical modelling of the speech DFT amplitudes. The probability density function of the speech spectral amplitude is modelled with a simple parametric function, which allows a high approximation accuracy for Laplace- or Gamma-distributed real and imaginary parts of the speech DFT coefficients. Also, the statistical model can be adapted to optimally fit the distribution of the speech spectral amplitudes for a specific noise reduction system. Based on the super-Gaussian statistical model, computationally efficient maximum a posteriori speech estimators are derived, which outperform the commonly applied Ephraim-Malah algorithm.

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