G.723.1协议与相关通信业务在嵌入式系统上的实现

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1、ABSTRACT”Unifiedcommunication”isamorehumancommunicationconcept，closertothegoalof5Wcommunication，withlargerdevelopmentspaceandwidemarket．Thispaperisbasedonthethoughtof”unifiedcommunication”，usingG723．1speechcodecprotocol，designedaspeechandfilecommunicationsystembasedonC／Smode．Theserver-

2、endrunsonthePCLinux，followedbyaMySQLdatabase．Theclient-endrunsontheLinuxARMembeddedplatformW90P710fromWinbondCo．Inordertomeetthereal-timerequirementsinspeechcommunication，beforethesystemdesign，itneedstoimprovethecodecrate．AccordingtotheITU-Tsource，optimizethecodebotllinalgorithmandAsse

3、mbly．Inalgorithm，mainlyfromsimplifysearching，rccursivingiterationandspacefortimethreeaspectstorewritethecodesinsomemodules．Atthesametime，changethebasicoperationfunctionfromCtoassemblylanguage．Bytested,theoptimizationresultsimprovedthespeedofthecodecgreatly,andthespeechMOSvaluereachesto

4、3．4．ThesystemUSeStheUDPSocketmechanismtotransferinformationmutually．Theserver-endUSesJAVA,andrealizedthenecessarytips，theresponsetoadministrators’operationsandtheresponsetoclients’requestsbyusinggraphicalinterfaceandmulti-threadmechanism．Theserver-endprogramlinkstoback—endMySQLdatabase

5、，realizedtorecord，modifyandreadtheUSergroupsandusers’informationbyusingSQL．Andthedatabasedesignmeetsthethirdparadigm．Atthesametime，theclient-end,whichiSembeddedintotheARMsystem，USeSClanguage，andsatisfiestheUSers’variousoperatingrequirementsbyusingmulti·threadprogramming．Well．thecontrol

6、informationfromclient-endshouldbesenttotheserver-endtorecordandthenforwarded，butthedatashouldbesenttoanotherclientdirectly,accordingavoidingtheSOlVercommunicationcongestion．Atthesametime，thenetworkovertimeandresponseovertimefunctionsaredesignediIlthesystem，SOthesystemCanstillworkaftero

7、vertime．KEYWORDS：unified-communication，G723．1，embeddedsystem，MySQLh“目录第一章绪论⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．11．1研究背景和必要性⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．11．2国内外现状和技术发展趋势⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯21．3本论文研究主要内容⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．31．4论文创新点⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯41．5拟解决关键技术问题⋯⋯⋯⋯