In this paper,we concentrate on the mac protocols of wireless sensor networks， especially the impact imposed on speech transmition．We also want to find a speech coder which is fit for wireless sensor networks．Firstly,we intorduce the existing mac protocol，such aS IEEE802．1 1，SMAC protocol，TRAMA protocol，DMAC protoc01． Moreover we analyse and make comparison of them．Secondly，we propose a new mac protocol named VR-TDMA．Simulation in NS2 proves that this protocol Canhave pleasing performance in real．time application．Thirdly,we make a comparison of some famous speech encoders．The result indicates that ADPCM(Adaptive Di脏rential Pulse Code Modulation)is simpler than advanced low bit。rate VOICe coding techniques and doesn’t require as heavy caculations．In this work，We simplify the algorithm in order tO make it fit for the networks beaer．Actual tests prove that this simplified algorithm work well in wireless sensor networks．

Wireless multimedia sensor networks.pdf

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