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: Research Article The Effect of a Voice Activity Detector on the Speech Enhancement Performance of the Binaural Multichannel Wiener Filter | Hindawi Publishing Corporation EURASIP Journal on Audio Speech and Music Processing Volume 2010 Article ID 840294 12 pages doi 2010 840294 Research Article The Effect of a Voice Activity Detector on the Speech Enhancement Performance of the Binaural Multichannel Wiener Filter Jasmina Catic 1 Torsten Dau 1 Jorg M. Buchholz 1 and Fredrik Gran2 1 Department of Electrical Engineering Technical University of Denmark Oersteds Plads Building 352 2800 Kgs. Lyngby Denmark 2 GN ReSound A S Lautrupbjerg 7 2750 Ballerup Denmark Correspondence should be addressed to Jasmina Catic jac@ Received 28 January 2010 Revised 24 June 2010 Accepted 5 October 2010 Academic Editor Jont Allen Copyright 2010 Jasmina Catic et al. 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. A multimicrophone speech enhancement algorithm for binaural hearing aids that preserves interaural time delays was proposed recently. The algorithm is based on multichannel Wiener filtering and relies on a voice activity detector VAD for estimation of second-order statistics. Here the effect of a VAD on the speech enhancement of this algorithm was evaluated using an envelopebased VAD and the performance was compared to that achieved using an ideal error-free VAD. The performance was considered for stationary directional noise and nonstationary diffuse noise interferers at input SNRs from -10 to 5dB. Intelligibility-weighted SNR improvements of about 20 dB and 6 dB were found for the directional and diffuse noise respectively. No large degradations 1 dB due to the use of envelope-based VAD were found down to an input SNR of 0 dB for the directional noise and -5 dB for the diffuse noise. At lower input SNRs the improvement decreased gradually to 15 dB for the directional noise and 3 dB for the diffuse noise. 1. Introduction An increasing .
