Speech Enhancement Using Improved Adaptive Null-Forming in Frequency Domain with Postfilter

Heng ZHANG  Qiang FU  Yonghong YAN  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E91-A   No.12   pp.3812-3816
Publication Date: 2008/12/01
Online ISSN: 1745-1337
DOI: 10.1093/ietfec/e91-a.12.3812
Print ISSN: 0916-8508
Type of Manuscript: LETTER
Category: Speech and Hearing
speech enhancement,  adaptive null-forming,  auditory subband,  postfilter,  robust ASR,  

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In this letter, a two channel frequency domain speech enhancement algorithm is proposed. The algorithm is designed to achieve better overall performance with relatively small array size. An improved version of adaptive null-forming is used, in which noise cancelation is implemented in auditory subbands. And an OM-LSA based postfiltering stage further purifies the output. The algorithm also features interaction between the array processing and the postfilter to make the filter adaptation more robust. This approach achieves considerable improvement on signal-to-noise ratio (SNR) and subjective quality of the desired speech. Experiments confirm the effectiveness of the proposed system.