煤炭作为我国的基础能源和重要工业原料，在国民经济中占有极其重要的战略地位。当前，煤矿安全生产形势依然严峻，加快煤矿应急救援装备建设、健全紧急避险机制、配备井下应急广播系统是对矿井通信联络系统的完善，对煤矿井下安全避险“六大系统”建设有重要的现实意义。 本文分析了矿用广播系统的发展现状，针对目前矿用广播系统存在的问题，研究了网络互联技术、IP组播技术、音频编码技术以及排队理论在广播系统中的应用。设计了基于Ethernet网络与CAN总线的矿用数字网络广播系统。通过以太网与CAN总线的互联，在CAN节点进行ID号的“二次寻址”，解决现有矿用广播系统终端节点容量不足的问题。应用组播技术，在VS2010平台上实现基于C/S架构的组播通信，解决了矿用广播系统点对多点的音频传输中，冗余数据对网络带宽的占用。应用音频解码技术，设计在以太网中采用PCM编码、CAN总线中采用OGG编码，实现有限带宽范围下，高音质音频编解码的播放需求。基于统计学排队理论建立Ethernet与CAN音频数据帧排队模型及双向语音传输模型，分析服务率、到达率以及系统容纳节点数对音频传输系统的影响。基于VS2010开发环境与SQL Server 2008数据库，对VS2010模板文件中的MFC应用程序做具体设计，实现了广播系统管理平台的设计，并在该平台上验证广播系统的各项功能。 广播系统测试表明，设计的矿用数字网络广播系统解决了语音对讲、节点扩充、分区广播等现存突出问题，达到了设计的目标，对煤矿安全生产及紧急调度具有重要的理论意义和工程价值。

As the basic energy and important industrial raw materials, coal occupies an important strategic position in the national economy.Coal mine production safety situation is still grim, accelerate the construction of coal mine emergency rescue equipment, improve the emergency mechanism, equipped with coal mine emergency broadcasting system is for the improvement of the mine communication system, to the coal mine safety "six systems" construction has important practical significance. This paper analysis the mine broadcasting system development status, according to the present problems of mine broadcast system, studies the network interconnection technology, IP multicast technology, audio coding technology and the application of the queuing theory in the broadcasting system. This paper designs a mine digital network broadcasting system based on Ethernet and CAN bus network,which via connected Ethernet and CAN bus and secondary addressing in the CAN node ID, to solve the problem of insufficient capacity of the terminal node in the existing mine broadcast system.Through the application of multicast technology, in VS2010 platform to complete multicast communication based on C/S architecture. Solve the mine point to multipoint audio broadcasting system transmission, similar packets to the network bandwidth utilization. By applying audio decoding technology, the design uses PCM encoded in Ethernet, CAN bus using OGG coding to achieve limited bandwidth high quality audio codec playback needs.Based on statistical queuing theory, establishment of audio transmission model and bidirectional speech transmission model in Ethernet and CAN, analysis of the service rate, arrival rate and the influence of the node number of audio transmission system.Based on VS2010 development environment and SQL Server 2008 database, using the template file in VS2010 MFC application make a specific design. Implements the broadcasting system design of the platform, and based on the platform to verify each function of broadcasting system. Broadcasting system test shows that, the design of mine digital network broadcasting system solved the voice intercom, node expansion, partition broadcast and other existing problems, has reached the design target. To the coal mine safety production and emergency scheduling has an important theoretical meaning and engineering value.