Enhancement of speech signals separated from their convolutive mixture by FDICA algorithm

Authors:
Rajkishore Prasad;Hiroshi Saruwatari;Kyohiro Shikano
Affiliations:
University of Electro-Communication, Chofu, Japan;Speech and Acoustic Laboratory, Nara Institute of Science and Technology, Nara, Japan;Speech and Acoustic Laboratory, Nara Institute of Science and Technology, Nara, Japan
Venue:
Digital Signal Processing
Year:
2009

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Abstract

This paper presents a novel method for the enhancement of independent components of mixed speech signal segregated by the frequency domain independent component analysis (FDICA) algorithm. The enhancement algorithm proposed here is based on maximum a posteriori (MAP) estimation of the speech spectral components using generalized Gaussian distribution (GGD) function as the statistical model for the time-frequency series of speech (TFSS) signal. The proposed MAP estimator has been used and evaluated as the post-processing stage for the separation of convolutive mixture of speech signals by the fixed-point FDICA algorithm. It has been found that the combination of separation algorithm with the proposed enhancement algorithm provides better separation performance under both the reverberant and non-reverberant conditions.