The digital trunking communication system has a late initial step in our country . most of them are introduced from abroad . for most of the encryption algorithm is kept secret , it is difficult to know whether it is perfect or not 我国发展集群通信系统起步晚,现有的数字集群系统差不多都是引进国外的,而这些系统中的加密算法大部分是保密的,在使用时并不清楚其保密性能是否完善。
In order to be compatible with digital trunked communication , the paper introduces to use cpld to design the module of synchronous serial communication , which upgraded the trunked logic controller to expand its functions ，同时本文介绍了在向下兼容已有的模拟集群通信系统做的研究工作，使用cpld设计双工同步数据通信模块。用它对目前集群逻辑控制器进行功能升级使其具备了双工同步数据通信的功能。
Speech communication is one of the most used modes in the digital trunking communication system . excellent algorithm of speech coding can save the bandwidth resource , improve the utilization of frequency , so it has important value for investigation 语音通信是数字集群通信系统中最常用的通信方式之一,优良的语音编解码算法能够更加有效地节省带宽资源,提高频率利用率,因此具有重要的研究价值。
Reliable cluster communication is the base of was information exchange . however , there still exist problems such as low adaptability , deficient fault tolerance and lack of configurability in most cluster communication systems of today ' s application servers 可靠的集群通信是web应用服务器信息交互的基础，然而目前应用服务器产品的集群通信系统普遍存在着自适应能力低、容错性较差、可重配能力不足等问题。
Sencondly , the driver of voice processor ac48304 was developed on huaheng embeded linux platform . and then the signalling process and voice packet process program was developed on the platform . finally , the problem of packetizatized voice transmission was analized 接着,在华恒嵌入式linux平台上开发了语音压缩处理器ac48304的驱动程序,并根据集群通信系统的特点,设计了信令处理程序以及语音包处理程序,并进行了各模块的测试。
Three optimization methods are presented by researching the algebraic codebook excitation linear prediction ( acelp ) algorithm , and optimized the feel weighted filter , the search algorithm of the linear spectrum pair ( lsp ) , and the search method of the algebraic codebook respectively 通过研究tetra数字集群通信系统中的acelp语音编解码算法,分别在感觉加权滤波器的设计、线谱对参数量化的搜索方式、代数码本的搜索方式等三个方面提出了优化算法。
The 350m trunked communication system plays a significant role in daily dispatch - command in the police department . it is simple but reliable , and widely used . its calling connect is fast , continued and in high calling quality 350m集群通信系统因为其简单可靠,呼叫接续迅速,覆盖范围较大,通话效果良好,单呼、组呼、 pabx呼叫、调度呼叫等业务功能全,在公安机关的日常指挥调度工作中发挥了巨大的作用,有效的提高了公安干警的战斗力,成为科技强警的重要组成部分。
After implementing digital signaling system into analogue trunking system , we get these improvements : more reliable connection between users , higher speed of connection , and more functions in trunking system . mdc1200 signaling system is one kind of this signaling , which is developed by motorola for improving the performance of its analogue trunking system 模拟集群通信是指它采用模拟语音进行通信，整个系统内没有数字技术，但后来为了使通信连接更为可靠，模拟集群通信系统也采用了数字信令，使集群通信系统的用户连接比较可靠，连通的速度有所提高，而且系统功能也相应增多。
First , it introduces the corresponding knowledge , technical roadmap of trunking system , and digital trunking system signaling . second , it presents the encoding , decoding , modulation , demodulation parts and several signaling functions of mdc1200 signaling system . in addition , it analyzes some signaling data packet formats 本文首先对集群通信的相关知识、发展趋势以及集群通信数字信令进行了介绍，接着对mdc1200信令的编码、解码过程，调制、解调方式以及各种信令功能的信令数据格式进行了详细地分析。
In recent years , the police departments had built their private computer network with the golden shield project working in many provinces . so the trunking system can be connected in a province using their private computer network . in this way a roaming trunking system were built in a province 近年来,随着国家金盾工程的实施,各个省自治区的公安系统都建立了自己专用的计算机网络,这样可以利用公安系统的ip专网把原来的集群通信系统联系起来,形成一个全省范围内的专用集群通信网络。
