This paper puts forward an interest management method fitting for voice communication in distributed virtual environment(DVE),using the publish-subscribe pattern in the distributed event system by reference.

The Design of Encryption Chip Based on Permutation Code and Its Research on Voice Communication;

Research on Information Supervision and the Speech Communication System in Specialize Train;

In view of the limitation of signal dotting and phonetic communication device used for coal mine,a kind of flameproof signal dotting and phonetic carrier-current communication device especially suited to satisfy the current needs of modernization mine production with high-capacity and high-efficiency is designed,its effects and performance has been validated.

Designs and realizes a digital signals voice communication simulate system,which based on client/server structure and IP protocol,the system realizes one-to-multi semi-duplex communication with using the communication mode as broadcasting station,and realizes point-to-point full-duplex communication with using the communication mode as telephone.