During speech production, the significant excitation of the vocal tract occurs at places like instants of glottal closure and the onset of events like bursts. Hence the energy in the excitation signal is high around these places and these instants play an important role in the perception of speech. This property had been exploited in this work to derive a weight function. The linear prediction (LP) residual of spectral subtracted speech signal was weighted by the weight function to enhance the instants of significant excitation of speech. The musical noise in the enhanced speech obtained by exciting the time varying pole filter with the modified residual was found to be reduced significantly.