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MPEG-4AAC音频解码器原型芯片的设计.pdf

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pressionfield,MPEG-4AACisoutstandingwithbetteraudioquality,pressionrates,morechannelsandvarietyofsamplingrates,andit’,thesystemarchitectureisfirstlyestablished;then,consideringthefactorssuchasspeedandarea,theFPGAprototypeisdesignedandthefunctionisvalidated;atlast,,MPEG-:(1).Twosystematicaldesignsfordifferentspecifiedgoalsarebroughtforward,-timerequirementwithmuchredundancefortheaudiolessthan2channels,SOonesystematicaldesignforsmallerareaisgivenwithlowerspeed;asfortheaudiowithmultiplechannels,systematicaldesignforhigherspeedisnecessary,atthepriceofbiggerarea.(2).-streamdecodermodule,ashiftregisterarchitecturewithconfigurablebitsandautomaticlaodingisproposed;innoiselessdecoder,paringwithothertwoalgorithmsonspeedandmemorycapacity;inre-quantizationmodule,aalgorithmofdiv·8look—up-tableisusedamongallkindsoflook-·up·-,477registers,and2,737,.(3).Finally,MPEG-,pilerandSTA(StaticTimingAnalyze)usingPrimeTime,&routeusingAstro,:AACaudiodecoder,ASICdesign,systematicdesign,---???????????????.????????????????????????????????????????.7面积优化系统级设计方案????????????????????14流水线设计结构示意图????????????????????..16流水线设计时序示意图????????????????????17速度优先面积折中系统级设计方案??????

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