語音壓縮編碼g.723.1標(biāo)準(zhǔn)的研究

1、分類號(hào)～——密級(jí)UDC彳’屈大擎工程碩士學(xué)位論文論文題目：語m血1目I‘T2縮編碼G7231標(biāo)準(zhǔn)的研究論文作者：張引合指導(dǎo)教帥姓名、職稱：甘育裕教授兼職導(dǎo)師姓名、職稱、工作單位：張延松研究員煤炭科學(xué)研究總院重慶分院l扣請(qǐng)學(xué)位級(jí)別：工程碩士上程領(lǐng)域：電子與信息工程學(xué)位授予巾位：重慶大學(xué)論文提交H期：2003年10月25日答辯日期：2003年12月9日答辯委員會(huì)主席：曾孝平教授淪文評(píng)NA：印勇副教授曾喜華高工2003年10月25同重盎奎堂堡

2、主篁篁笙苧蔓塞塑薹ABSTRACTWiththerapiddevelopmentofsatellitecommunications，digitalmobilecommunicationsandpersonalcommunications，theconflictbetweenuser’sdemandandcapabilityofcommunicationchannelsismoreandmoreoutstandingHowtoimprov

3、etheusageefficiencyofresourcesavailableisthefocustowhichpeoplehaveputmuchattentionNowthestandardsofspeechcompressioncodingprovideawayoftransportingspeechsignalsefficientlyInfaetallofthemareteducethebaudrateofdataunderdef

4、initespeechqualityG723aerithemeficisacompressingarithemetic礪atproposedbyITU—Tandappliedinspeechandotheraudiofrequencysignalsoflowvelocitymultimediaservices，suchas：H323，H324systemThisarithemeticprovidesinspectiontosilence

5、speechflamesandfillsincomfortablenoisewhenitissilenceIfoptimizesystemandincreasethecomplexitylimitedlyweCangethigherqualityofspeech，G7231isalsoavai|abieinmusicorothervoicesignals，butthemanagingeffectisnotasgoodasspeech’S

6、AmongthestandardswhichareestablishedusingmixedcodingtechnologyG7231hasthehighestefficiencyandiswidelyusedinmanyfieldsBut，togainthehighqualityandlowbaudrate，G7231paysoutthecosts，suchasthehighcomplexofcodingarithmetic，high

7、delayandlargestorespaceEachofthembringsupthedifficultiesofitsrealtimeimplementationThefirststepofusethearithmeticistounderstanditaccuratelyandcodethenchangeitintoprogramCanberill]，thisisthepreconditionbutwecan’tassuretha

8、tthecapabilitycallmeetthedemandofcustomers，SOweshoudimprovethearithmeticaccordingtothedemandofpracticeAtthesametime，inpractice，theprogramalsolimitedbythehardwaresuchas：sizeofmemoryspeedofCPU，etcDetailedthebasictechnology

9、ofspeechcodingandbasedontheindepthstudyofG7231，thepaperimplementsitusingClanguageandprovidessomeoptimizingpolicieswithrespecttocode—bookresearchAtthesametime，basedontheanalysisofTMS320C5410EVMenvironment，thepapergivessys