集群通信系統(tǒng)中語音壓縮編解碼的研究與DSP實現(xiàn).pdf

1、西南交通大學碩士學位論文集群通信系統(tǒng)中語音壓縮編解碼的研究與DSP實現(xiàn)姓名：熊堃申請學位級別：碩士專業(yè)：通信與信息系統(tǒng)指導教師：陳向東20100501西南交通大學碩士研究生學位論文第1I頁Abstrathlmedigitaltrunkingcommunicationsystem，becauseofthefrequencyresourcesaresolimited，itisnecessarytosendthevoicesignalbyco

2、mpressioncodingMeanwhile，inordertoenableUSerStogetgoodreceivinigvoice，thecompressionalgorithmsshouldhavegoodvoicequalityandshortertimedelaycharactewisticsAmon2SOmanyvoicecompressionstandards，theperformanceofG729voicecode

3、cwhichisestablishedstandardsbyITUT(InternationalTelecommunicationUnion)in1996isveryeyecatchingItusestheCS—ACELPcodingschemeandCancompressthesamplerateof64kbpsvoicesignal(PCM)to8kbpsrate，almostwithoutanyqualitylosingMeanw

4、hilethealgorithmdelayisonly10ms，thereforeitisdesirablevoicecodecalgorithmindigitaltrunkingcommunicationsystemInrecentyears，digitalsignalprocessingalgorithmsanddevices(DSPchip)aredevelopingrapidlySOitimplementsthespeechen

5、coderInthisDaperitshowsavoicecodecsystemdesignwhichbasedontheG729standardbyusingtheDSPchipTMS320C5402asacoreprocessorFirstweintroducethecurrentpopularvoicecodectechnologyespeciallyparametriccodingtechnology；thendescribet

6、heG729voicecodecalgorithmindetail，andusethisalgorithmasthecorevoicealgorithmofthesystemdesigne；andthenintroducethesystemdesignfromthesoftwareandhardwarecomprehensivelyincludingtheconnectionbetweenthevariouschips，driverpr

7、ogramsandDSPmainprogramsdesign；FinallyAimedatthehardwaresystemcharacteristicsweimprovetheG729standardfromthetheprogramstructureandalgorithmmethod，andsuccCSsfullyimplementeinthesystemBycomparingthevoicewaveformbetweenorig

8、inalandreconstruction，itprovesthecorrectuessofthesystemcodecfromtheobjective；meanwhile，throughlisteningbythehuman’Scars，itprovesthefeasibilityofthesystemcodecfromthesubjectiveKeyWords：Trunkingcommunicationsystem，VoiceCom