Speech Enhancement Using Improved Adaptive Null-Forming in Frequency Domain with Postfilter
Hong Zhang, Q. FU, Yonghong Yan · IEICE Transactions on Fundamentals of Electronics Communications and Computer Sciences · 2008
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.