Journal of Applied Sciences1812-56541812-5662Asian Network for Scientific Information10.3923/jas.2013.1239.1244QingyunWang YongqiangBao LiZhao QiaoMeng 82013138A new scheme of source localization and directed speech enhancement
in digital hearing aid in reverberation environment is proposed in this paper.
In the field of source localization, an adaptive PSP-AED time delay estimation
algorithm is proposed. With the position of the source, the scheme enhances
the speech signal using broadband Linearly Constrained Minimum Variance (LCMV)
beamformer. The interferences and the noises are eliminated when the beampattern
is directed to the target source position. The proposed algorithm is robust
to noise. It estimates the time delay accurately when Signal to Noise Ratio
(SNR) is lower than 0 dB and then the position of the source is acquired. The
improvement of Signal to Interference Ratio (SIR) is achieved upper than 7 dB
in reverberation environment. Numerical Experiments prove that the performance
of wave quality, spectrogram and SIR is improved notably in the enhanced speech
signal.]]>Pandey, A. and V.J. Mathews,201119699710Kamkar-Parsi, A.H. and M. Bouchard,20116011411151Widrow, B.,200112632Wu, W.C., C.H. Hsieh, H.C. Huang and O.T.C. Chen,20072007pp: 14Keyrouz, F. and A. Abou Saleh,20072007pp: 97104Supper, B., T. Brookes and F. Rumsey,20061410081017Benesty, J.,2000107384391Benesty, J., J. Chen, Y.A. Huang and J. Dmochowski,20071510531065Chen, J., J. Benesty and Y. Huang,20062006Yamada, I., K. Slavakis and K. Yamada,2002510911101Yamada, I. and M. Yukawa,20021293296Yukawa, M., K. Slavakis and I. Yamada,20071516651680Benesty, J., J. Chen and Y. Huang,2008Saysar, M. and M. Aldaihani,20126587600Li, J. and P. Stoica,2006Kuttruff, H.,2000