A review on intrensic mode function of EMD

Speech signal is getting influenced by noise at time of generating, transmitting and receiving. In such case the enhancement of signal plays very important role before processing the speech signal. In this paper the technique of speech signal enhancement is reviewed using Empirical Mode Decomposition (EMD) with its Intrinsic Mode Function's (IMF's) processing and inherent problem occurring in IMF generation is been addressed. The empirical mode decomposition for non-stationary and nonlinear signal analysis is applied on speech signal. Intrinsic mode function is oscillatory part of signal obtained after Hilbert-Huang Transformation of signal is done. This intrinsic function has to be extracted properly from signal in order to keep its properties and physical meaning of signal unaltered.