基于zigbee的无线语音传输系统的设计本科论文.doc

中北大学信息商务学院本科生毕业论文PAGE\*MERGEFORMATIV基于ZigBee的无线语音传输系统的设计摘要：ZigBee技术是一种短距离、低复杂度、低功耗、低速率、低成本的无线网络技术。其主要特性包括：具有多跳传送（multi-hoprelay）机制、网络扩展性能好、布设容易以及具有自组织与自修复能力。在无线传感网络的应用中，声音也是一种传感量，传输采样的声音数据正是声音传感应用的基本要求，所以本论文针对IEEE802.15.4/ZigBee的应用环境，提出实现语音通信的研究课题。本课题设计了基于CC2430芯片的Zigbee硬件模块，经过了解，在空旷环境下的视距传输距离大约30米；在此基础上设计了基于IEEE802.15.4的语音通信系统方案，开发了硬件试验平台，用以研究短距离的无线语音通信技术。语音通信方案充分利用CC2430SoC的性能特点，使用芯片内部的ADC和APR9600完成语音采样及回放，无需外部的语音编解码器件且使用的外围器件很少。系统可以很好地实现实时语音无线传输，发射功率小于0dBm，语音延时小于25ms，传输距离达到15米，音质MOS测试分达到3分以上。该方案硬件简单，成本低廉，功耗很低，可应用于矿井井下生产、无线传感器网络、消防、安全监控领域，拓展了IEEE802.15.4应用范围。关键词：IEEE802.15.4；ZigBee；CC2430；APR9600；无线语音通信BasedonZigBeewirelessvoicetransmissionsystemdesignAbstract：ZigBeetechnologyisakindofshort,lowcomplexity,lowpowerconsumption,lowrate,lowcostwirelessnetworktechnology.Itsmainfeaturesinclude:withmultiplehopstransmission(multi-hoprelay)mechanism,extendthenetworkperformanceisgood,layouteasilyandhassinceorganizationandtheself-repairingability.Inwirelesssensornetworkapplications,theaudioisalsoakindofsensorvolume,transmissionsamplingvoicedataisthebasicrequirementofvoicesensing,sothispapertheapplicationofIEEE802.15.4/ZigBeeproposedrealizevoicecommunicationenvironment,theresearchsubject.ThistopicwasdesignedbasedontheCC2430chipZigbeehardwaremodules,afterunderstandinginopenenvironment,thetransmissiondistancestadiaabout30meters;OnthebasisofIEEE802.15.4designedonthebasisofvoicecommunicationsystemsolutions,developedhardwaretestplatformtostudythesprintwirelessvoicecommunicationstechnology.VoicecommunicationsplanmakefulluseofCC2430SoCperformancecharacteristics,usechipAPR9600completedinternalADCandspeechsamplingandplayback,withoutexternalvoicecodecpiecesanduseofperipheraldevicesseldom.Systemcanwellrealizereal-timespeechwirelesstransmission,transmissionpower,lessthan0dBm25msspeechdelay,thetransmissiondistancetolessthan15meters,timbreMOStestpointstothreepoints.Theschemehardwaresimpleandlowcost,lowpowerconsumption,andcanbeusedtomineproduction,wirelesssensornetwork,firecontrol,safetym