"
Speech enhancement for nonstationary noises by wavelet packet transform and adaptive noise estimation "
link:
http://ieeexplore.ieee.org/xpl/login.jsp?tp=&arnumber=1595341&url=http%3A%2F%2Fieeexplore.ieee.org%2Fxpls%2Fabs_all.jsp%3Farnumber%3D1595341