In this work, a uni ed system for voice activity detection (VAD) and speech enhancement is proposed. In the proposed system, there is mutual exchange of information between VAD and speech enhancement blocks. A new, robust and low complexity VAD algorithm is implemented for the VAD block of the uni ed system. The newly proposed VAD algorithm uses a periodicity measure and an energy measure obtained from spectral energy distribution and spectral energy di erence of the input speech data. For the speech enhancement block, the Modi ed Wiener Filtering (MWF) algorithm is utilized. It has been...