Introduction

　　Now,withdigitalsignalprocessingtechnologyandcontinuousimprovement,microcontroller,digitalsignalprocessorsaswellasthevoiceofprogressindealingwithlarge-scaleintegratedcircuits,speechsynthesis,speechrecognition,voicestorageandplaybacktechnologymorewidely.Inthispaper,compactsize,lowpowerconsumptionofdigitalaudiostorageandplaybacksystemcanreplacetraditionalvoicerecordingsystem.

　　1Backgroundandsignificanceoftopics

　　Fromthetapes,videotapestoCD,VCD,DVD;fromblack-and-whiteTV,colorTV,high-definitionTV(HDTV)toadigitalTVsignalprocessingfunctions;fromthegramophone,taperecordertothevoicemail;nowatanaloginformationintodigitalinformationrevolution,thetraditionalvoiceofthetaperecordingsystembecauseofitsbulky,inconvenienttouseinelectronicsandinformationprocessinglimitationsinusebymany.Althoughthecurrentsystemofradioandtelevisionhasnotyetbeendigitizedreal,Ibelievethatinthenearfuture,therealdigitalTV,digitalradio,digitaltaperecorderswillenterthefamily.Therefore,thestudyofdigitalaudiosignalstorage,processingandplaybacksystemhasaveryimportantpracticalsignificance.

　　Amongthem,thekeytechnologiesare:Inordertoincreasethevoicestoragetimeandincreasetheutilizationofmemory,usinganon-lossycompressionalgorithmtocompressvoicesignalsandthenstoredagaininthereplayisdecompressed;Atthesametime,thedigitalinputvoicesignalfiltertosuppressnoiseandinterference,soastoensurereliablevoicequalityplayback.