Information Technology Journal1812-56381812-5646Asian Network for Scientific Information10.3923/itj.2013.1089.1097ZhouJian WangHuabin FangXianyong TaoLiang ZhaoLi 62013126A whisper intelligibility enhancement method was proposed based on the Real-valued Discrete Gabor Transform (RDGT) in the joint time frequency domain where the RDGT can change the density of the spectrum through the over sample rate parameter. An optimal logarithmic spectrum estimator was derived based on RDGT coefficients. Experimental results showed that the proposed method improved the intelligibility of enhanced whisper in an adverse noise environment when using a proper over sample rate value. The largest gains in intelligibility were got when the over sample rate value is set to 16 or 32. The proposed method outperforms other four speech enhancement algorithms in terms of intelligibility improvement. The experimental results also implied that the intelligibility performance of the conventional speech enhancement algorithms might be improved when increasing the density of the time-frequency spectrum properly.]]>Ahmadi, F., I. McLoughlin and H. Sharifzadeh,2008Boll, S.,1979Cohen, I. and B. Berdugo,2001Ephraim, Y. and D. Malah,1984Ephraim, Y. and D. Malah,1985Hu, Y. and P.C. Loizou,2007Ito, T., K. Takeda and F. Itakura,2005Jou, S.C., T. Schultz and A. Waibel,2005Lim, J.,1978Loizou, P.C. and G. Kim,2011Scalart, P.,1996Sharifzadeh, H.R., F. Ahmadi and I.V. McLoughlin,2009Sharifzadeh, H.R., I.V. McLoughlin and M.J. Russell,2012Taal, C.H., R.C. Hendriks, R. Heusdens and J. Jensen,2011Tao, L. and H.K. Kwan,2008Tao, L. and H. Kwan,2012Tartter, V.,1989Varga, A. and H.J.M. Steeneken,1993Zhou, J., R. Liang, L. Zhao and C. Zou,2012Zhou, J., H. Wang, L. Tao and L. Zhao,2012