基于ARM嵌入式處理器的實時錄音編碼研究與實現(xiàn).pdf

1、分類號：TN432密級：公開UDC：6213學(xué)號：020652Ft。SU715東南大學(xué)碩士學(xué)位論文基于ARM嵌入式處理器的實時錄音編碼研究與實現(xiàn)研究生姓名：塑睦導(dǎo)師姓名：睦生墊熬授中請學(xué)位級別王堂亟學(xué)科專業(yè)名稱煎電生與固佳皇王堂一一論文提交日期星魚生且盡論文答辯曰期星壘鰻復(fù)墨且】星目學(xué)位授予單位盤畝盍堂學(xué)位授予日期2Q生且且答辯委員會主席耋建苤：論文評閱人基匭明昱建齷2003年3月12日Abstractlnthisthesisthere

2、searchanddevelopmentoferealtimesloeschencoderforhandholdterminaIapplicationchip(Garfield)anddevelopamethodforsystemestimationofperformanceandpowerbaseonARMlSSmodelGadield4projectisaSystemOnaChip(SoC)withARM丌DMIascoreproc

3、essorwithoutcacheandincludesotheronchipmodulesIikehighspeedembeddedmemory(eSRAM)andMultimediaAccelerator(MMA)，etc1nthepaper，firstly，introduco∞r(nóng)nealgorithmsforspe目chencoder，andcomparethesealgorithmsofperformanceandcomplex

4、ityThandescribeG729AandG726indotails，Wechoosefixedpointalgodthm，whichmakesFPUorDSPunnecassary，enhancestheencodingperformanceandreducesthesystemcost，describehowtoconversefIoatpointelgorithmtofixedpointSecondlywedooptimiza

5、tiononeveryIevel，Iikeglobal，functional，algortthm，andassemblyofsoftwareitseff；afterthis，wedooptimizationbaseollprocessorandGarfieldchip，suchas。usingembeddedSRAMandhardwareMultimediaAcceleratorWhendonethiswedosystemperform

6、anceastimation(ARM丌DMI，A只M720T，ARM91usinghighIevelCmodeIofEMIandSDRAMbaseonARMISSmodel，thencornparetheresuRofG726baseonARM丌DMIandrealchipGarfieldwefindoutthatthed晰erenceis10％around，soitisusefuIfordevelopingareaIsystem：At

7、thesametime，weanalysistheencodedspeechqualityafteroptimizationofthesetwoelgorithms：AIsoweexplorethepowerconsumptionofG729AusingdifferentmemorylocationandgetagoodmemoryplacementforlowpowerconsumptionBynow，G726hasbeenimpor

8、tedtoGarfield4chipandcompletesthespeechcodingforrealtimeimplantationWhensystemdockis70MHzthespeechcodingcapabilityls36∞Kbytes／sBecauseoftheIowprocessabUityofGarfieldandthecornpiexityofG729AG729AcarlnotreachreaItimeimplem