基于ZigBee的无线语音通信系统设计与实现

发布时间：2018-07-25 11:19

【摘要】：如今在生活、科研等领域里面无线传感器网络被广泛的应用，但是随着人们对监测需求的日益增长，传统的监测温湿度的无线传感网己经不能够满足应用的需求。丰富的多媒体信息，如声音、图像、视频等被逐渐引入到无线传感网中，从而促进了无线多媒体传感器网络(WMSNs)技术的发展。本文首先对无线多媒体传感器网络和ZigBee技术的现状进行了分析，接着分析了几种常见的语音编解码技术，，然后提出了基于ZigBee的无线语音通信系统，并给出了整体设计方案。该系统由ZigBee无线传输子系统和语音处理子系统构成，两个子系统之间通过串口进行数据交换。其中ZigBee无线传输子系统的主控芯片是单片机CC2530，在TI的ZigBee协议栈ZStack-CC2530-2.3.0-1.4.0上进行应用程序的开发。语音处理子系统的主控芯片是DSP芯片TMS320VC5509A，语音编解码标准采用G.729A。考虑到在语音通信系统中，节点可能经常处于移动状态，本文设计了一种检测路由器节点是否离开其父节点通信范围的方法，并在节点重新加入网络之后能向原通信节点发送自己的网络地址，从而保证了节点在移动的过程中语音通信的正常进行。由于节点在移动过程中会经常的进行路由发现，容易产生广播风暴，因此本文提出了一种基于邻居节点的改进的AODVjr路由算法，经仿真验证该算法比原算法具有较少的路由请求分组和较小的丢包率。考虑到语音传输质量问题，本文提出了一种基于语音数据包序列号的缓冲算法，能有效的消除语音抖动。通过系统整体测试得出本文提出的基于ZigBee的无线语音通信系统能实现基本的语音通信功能：单跳的广播通信和多跳的单播通信。
[Abstract]:Nowadays, wireless sensor networks are widely used in life, scientific research and other fields, but with the increasing demand for monitoring, the traditional wireless sensor networks for monitoring temperature and humidity have been unable to meet the needs of applications. The rich multimedia information, such as sound, image, video and so on, has been gradually introduced into wireless sensor networks, thus promoting the development of (WMSNs) technology in wireless multimedia sensor networks. This paper first analyzes the current situation of wireless multimedia sensor network and ZigBee technology, then analyzes several common speech coding and decoding technologies, then puts forward a wireless voice communication system based on ZigBee, and gives the overall design scheme. The system is composed of ZigBee wireless transmission subsystem and voice processing subsystem. The two subsystems exchange data through serial port. The main control chip of ZigBee wireless transmission subsystem is single chip microcomputer CC2530. The application program is developed on TI's ZigBee protocol stack ZStack-CC2530-2.3.0-1.4.0. The main control chip of speech processing subsystem is DSP chip TMS320VC5509A, and the standard of speech coding and decoding is G. 729A. Considering that nodes in voice communication systems may often be in a mobile state, this paper designs a method to detect whether a router node is out of its parent communication range. After rejoining the network, the node can send its own network address to the original communication node, which ensures the normal communication of the node in the process of moving. Because nodes often find routes in the process of moving, it is easy to generate broadcast storms. Therefore, an improved AODVjr routing algorithm based on neighbor nodes is proposed in this paper. Simulation results show that the proposed algorithm has less routing request packets and lower packet loss rate than the original algorithm. Considering the quality of voice transmission, this paper proposes a buffer algorithm based on speech packet sequence number, which can effectively eliminate the voice jitter. By testing the whole system, it is concluded that the proposed wireless voice communication system based on ZigBee can realize the basic voice communication functions: single hop broadcast communication and multi-hop unicast communication.
【学位授予单位】：南京邮电大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN92

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