Duysburgh B，LambrechtT，De Turck F，et al.An active networking based service formedia transcoding in multicast sessions[J].IEEE Transactions on Systems，Man，and Cybernetics，PartC:Applications and Reviews，2004，34（1）:19ˉ31.
[5]
G.728.Coding of Speech at16kbit/sUsing LowˉDelay Code Excited Linear Prediction[S].
[6]
G.729.Coding of Speech at8kbit/sUsing Conjugate Structure AlgebraicˉCodeˉExcited LinearˉPrediction（CSˉACELP）[S].
