基于dsPIC33F的数字对讲机的研究与实现

发布时间：2018-12-17 15:05

【摘要】：数字集群通信系统既具备个人通信的所有功能,也能控制与实现个人和群体之间的任意通讯,该系统具有较高的保密性和丰富的功能,实现了通信功能的智能化。本文所介绍的是一种数字集群系统终端设备数字对讲机的设计,该系统设计所依托的硬件环境是Microchip公司最新推出的dsPIC33F系列单片机以及与之相应的Explorer 16开发板,选取WM8510作为语音编解码芯片。以C语言与汇编语言作为软件开发语言,确定了基于此基础的数字对讲机系统终端的设计方案。dsPIC33F系列单片机是一系列价格低廉而且性能优异的单片机集合,片上实现了单片机控制能力和数字信号处理能力的无缝集成,非常适合本系统的开发使用。与之相应的Explorer 16开发板,同样是性能卓越而价格低廉的产品。选用这样的硬件环境能够在有效的数字对讲功能的前提下大大降低其造价。数字对讲机设计其首要目的就是为了降低的成本,以使得更多的人能够享受专用移动通信网。本文对数字对讲机中使用到的各功能模块的软件进行了设计,对本课题所涉及到的数字对讲机系统结构、语音活动检测、语音传输过程进行了设计与实现。采用G.711标准作为帧数据编解码标准,语音编码采用A律PCM编码方式实现。对整体的系统进行了调试,通过试验验证,本系统语音传输质量较高,能够满足一定规模的数字对讲的需求。
[Abstract]:Digital trunking communication system not only has all the functions of personal communication, but also can control and realize any communication between individuals and groups. The system has high confidentiality and rich functions, and realizes the intelligentization of communication function. This paper introduces the design of digital interphone for terminal equipment of digital trunking system. The hardware environment of this system is the dsPIC33F series microcontroller and the corresponding Explorer 16 development board, which is newly introduced by Microchip Company. WM8510 is selected as the speech codec chip. Taking C language and assembly language as software development language, the design scheme of digital interphone system terminal based on this foundation is determined. DsPIC33F series single chip microcomputer is a series of low price and excellent performance single chip microcomputer collection. It realizes the seamless integration of single chip microcomputer control ability and digital signal processing ability, which is very suitable for the development and use of this system. Corresponding to the Explorer 16 development board, is also excellent performance and low-cost products. This hardware environment can greatly reduce its cost under the premise of effective digital intercom function. The primary purpose of digital interphone design is to reduce the cost so that more people can enjoy private mobile communication network. In this paper, the software of each function module used in the digital interphone is designed, and the structure of the digital interphone system, the voice activity detection and the speech transmission process are designed and implemented. G. 711 standard is adopted as frame data coding standard, and speech coding is realized by A law PCM coding method. The whole system is debugged and verified by experiments that the quality of voice transmission is high and can meet the demand of digital intercom on a certain scale.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.54

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