tailieunhanh - Báo cáo hóa học: " Dual-Channel Speech Enhancement by Superdirective Beamforming"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Dual-Channel Speech Enhancement by Superdirective Beamforming | Hindawi Publishing Corporation EURASIP Journal on Applied Signal Processing Volume 2006 Article ID 63297 Pages 1-14 DOI ASP 2006 63297 Dual-Channel Speech Enhancement by Superdirective Beamforming Thomas Lotter and Peter Vary Institute of Communication Systems and Data Processing RWTH Aachen University 52056 Aachen Germany Received 31 January 2005 Revised 8 August 2005 Accepted 22 August 2005 In this contribution a dual-channel input-output speech enhancement system is introduced. The proposed algorithm is an adaptation of the well-known superdirective beamformer including postfiltering to the binaural application. In contrast to conventional beamformer processing the proposed system outputs enhanced stereo signals while preserving the important interaural amplitude and phase differences of the original signal. Instrumental performance evaluations in a real environment with multiple speech sources indicate that the proposed computational efficient spectral weighting system can achieve significant attenuation of speech interferers while maintaining a high speech quality of the target signal. Copyright 2006 T. Lotter and P. Vary. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. INTRODUCTION Speech enhancement by beamforming exploits spatial diversity of desired speech and interfering speech or noise sources by combining multiple noisy input signals. Typical beamformer applications are hands-free telephony speech recognition teleconferencing and hearing aids. Beamformer realizations can be classified into fixed and adaptive. A fixed beamformer combines the noisy signals of multiple microphones by a time-invariant filter-and-sum operation. The combining filters can be designed to achieve constructive superposition towards a desired direction delay-and-sum beamformer or in order to maximize the SNR .

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