1IntroductvoicecircuitWiththedevelopmentofsocietyandtechnology,themodernelectronicproductsdesignpaysgreatattentiontoproducttheeasyoperationaltype,theman-machinecontactsurfacecertainlytohavetobegood.Thesound,theimageandsoonmakethemostimportantmethodwhichassociateswiththehumanity,alsoismanifestedintheelectronicproductsdesign.Usesapronunciationchip,letstheproductopenthemouthtospeak,maygetupstrengthenedfunctionandsoonpropagandabrand,instructionuseruse,breakdownurgentprompt,entertainment,novelcausestheproductdesigntobepractical,toforestallopponentbyashowofstrengthenfeatstheenemybyasurpriseattack.Differentproductfunctionaldesignandmarketdemand,whendesignmustcorrectlyselectthedifferentpronunciationchiporthemoduleachievesthebestnaturalpriceratio.EngineermayfromfollowingseveralaspectsconsiderwhichkindoftypeselectsthepronunciationchipAfterfirst,thepronunciationcontenttranscribesthepronunciationchip,whetherthecontentdoeshavefrequentlytorevise:Ifthepronunciationcontentfrequentlymustrevise,forexample,recordinggreetingcardproductdesignandsoontheelectronicmessagemachine,shouldusetheISDseriesortheAPRseriespronunciationrecordingandsendingoutelectriccircuit,thesetwokindofchipsallsupportnomatterwhatrecords,fallstheelectricitypronunciationcontentnottobeabletolose,some10second-16minuteeachkindofdifferentchipmaysupplythechoice.Theacousticfidelityisbetter,mayapproachthemagnetictapeacousticfidelity.Ifafterthepronunciationcontentreadsindoesnotneedtorevise,mayconsiderusesOTP(disposablefevertowrite)thepronunciationelectriccircuitandtocoverthemembranepronunciationelectriccircuitSecond,howchoosesOTPperhapstheMASKpronunciationelectriccircuit:Howthesetwocenterselects,thenmainlyreadstheorderformthequantity,thevarietyaswellasthedateofdelivery.AftertheOTPpronunciationelectriccircuitmustusespecial-purposeprogrammingfeverwritingtoburnintothepronunciationcontentedition,needsthePCmachinesupport.Thiskindofchipnotsubscribesthequantitylimit,apiecealsomaymanufacture,thedeliveryisquick.Peripherypartfew,partitionsimple,thepriceislower,atpresenthas10second/21second/42second/85second/,170second/,341secondandsoonthemanykindsofmodelstobepossibletoelect(tobeallowedtodividemultistageapplication).Suitsmustfastpromotetheproduct,thebatchfew,thevarietyaremany,thepronunciationdoesnothaveto2modifytheproductselects.Oneachkindofproductandsoonelectricalappliances,motorcycle,coalgasalarmapparatus,rentalcarmileagefaremeterhasobtainedthewidespreadapplication.Iftheorderformquantityisverybig(above20,000pieces),requestpriceverylowapplication,likeeachkindofelectronictoy,electronicprayingtoBuddhamachineandsoonproduct,thenshouldusecoversthemembrane(MASK)thepronunciationelectriccircuit.Atpresenthas3second-360secondmanykindsofspecificationstosupplythechoice,maydivideintothemultistage.WhenMASKchiporderinghastosubscribethequantityandManDanliang,ifthrowsthesinglequantitynottobeabletoachieveforthefirsttimethefactorystipulationcompletelythesinglequantity,usuallyalsomustpay1500-3000Dollarlightcovertospend(generalfactoryalltopledgethrowsfullstipulationquantityinayeartoreturnlightcovertospend).Theproductioncycleislonger,usualneed35-45day.Throwsafterthelist,isunabletochange,theriskisbigger.Third,looksatpronunciationtranscribingthelength:Mayseefromtheaboveintroduction,theISD/APRmonolithicpronunciationrecordingandsendingoutchiplongestrecordingtimeis16minutes(the4KHZsamplingrate).Inthisrecordingtime,usestheISD/APRchiptohavethebetternaturalpriceratio.FlowsrapidlyBMP5008multistagerecordingandsendingoutboardwhichthecompanynewlypromotes,usesthebrand-new32Ksamplingcircuitdesign,theacousticfidelitygood,maymake4-8minutemultistagerecordingandsendingout,alsothepriceislow,needsthemonolithicintegratedcircuitsupportnotinaddition,thesuggestionuse.Ifmakesalongertimethesoundrecording(tosurpassabove16minutes),abovechipsuperiorityisnotobvious,suggestedusesflowsrapidlycompanysMP3seriesgeneraldevelopmentboardandtheBSP-60developmentboard,itsacousticfidelity,therecordinglength,theeasytooperateandthepriceandsoonhavethesuperiority,islongestmayachieveforseveraldozenshoursthesoundrecordings.(Thesetwodevelopmentsboarddetailedintroductionseesthishandbookthread).Fourth,lookedtherequestthepronunciationreturnsputstheacousticfidelity:Thegeneralpronunciationreturnsputs,theISD/APRmonolithicpronunciationrecordingandsendingoutelectriccircuitandtheOTP/MASKchipshouldallbeabletobecompetent.Butregardingsomeacousticfidelityrequestspeciallyhighsituation,forinstancethedesignmedicinemodelheartandlungssystem,therequestclearlyreturnsfeltrelieved,thelungnormalsound,theunusualsound,thegeneral3pronunciationchipacousticfidelitycouldnotachievethedesigneffect,shouldusetheMP3generaldevelopmentboard.Fifth,inthebasisproductdesignhasthemonolithicintegratedcircuit:Ifhasthemonolithicintegratedcircuit,theaboveintroducedthechipbasicallyallmayuse.Ifdoesnothave,thenonlycouldintheOTPchipandISD1810,1,110,1,420,2,560,inAPR9301,9600chooses.ISD4000andtheAPR6000serieschipallneedsthemonolithicintegratedcircuitsupport.MonolithicpronunciationrecordingandsendingoutelectriccircuitISD1110(monolithicmultistagerecordingandsendingoutelectriccircuit,10second/6.4Ksampling,butkeymodulationrecordingandsendingout,5Vpowersupply)ISD1420(monolithicmultistagerecordingandsendingoutelectriccircuit,20second/6.4Ksampling,butkeymodulationrecordingandsendingout,5Vpowersupply)ISD1810(monolithic8-16secondmayadjustsinglestagepronunciationrecordingandsendingoutelectriccircuit,the3Vpowersupply,16feetDIPseal)ISD2532/40(monolithicmultistagerecordingandsendingoutelectriccircuit,32second/8K,40second/6.4ksampling,butkeymodulationrecordingandsendingout,5Vpowersupply)ISD2560/120(monolithicmultistagerecordingandsendingoutelectriccircuit,60second/8Ksampling,butkeymodulationrecordingandsendingout,5Vpowersupply)ISD3360(60second/8Kmultistagepronunciationrecordingandsendingoutelectriccircuit,theSPIconnection,needstheMCUcontrol,the3Vpowersupply,theTSOPseal)ISD4002(2minute/8Kmultistagepronunciationrecordingandsendingoutelectriccircuit,theSPIconnection,needstheMCUcontrol,the3Vpowersupply)ISD4003(4minute/8Kmultistagepronunciationrecordingandsendingoutelectriccircuit,theSPIconnection,needstheMCUcontrol,the3Vpowersupply)ISD4004(8minute/8Kmultistagepronunciationrecordingandsendingoutelectriccircuit,theSPIconnection,needstheMCUcontrol,the3Vpowersupply)APR6008(themonolithicpronunciationrecordingandsendingoutelectriccircuit,theSPIconnection,needstheMCUcontrol.4K/5.6K/6.4K/8Ksamplingratesoftwarecontrollable,mayrecordandsendout4-8minute,thereliabilitywell,price4low,thesourceofgoodsissteady.ButthebottomchirpisslightlybiggerthantheISDchip)APR6016(themonolithicpronunciationrecordingandsendingoutelectriccircuit,theSPIconnection,needstheMCUcontrol.4K/5.6K/6.4K/8Ksamplingratesoftwarecontrollable,mayrecordandsendout4-8minute,thereliabilitywell,pricelow,thesourceofgoodsissteady.ButthebottomchirpisslightlybiggerthantheISDchip)API8108A(10second/8sectionofOTP(programmable)pronunciationelectriccircuit,pricelow,theperipheryelectriccircuitissuccinct.Partitionssimply,thedeliveryisquick.Doesnothavesubscribesthequantitylimit.16feetDIP/SOPseal,3V-6Vpowersupply)API840N(40second/31sectionofOTP(programmable)pronunciationelectriccircuit,pricelow,theperipheryelectriccircuitissuccinct.Partitionssimply,thedeliveryisquick.Doesnothavesubscribesthequantitylimit.20feetDIP/SOPseal,3V-6Vpowersupply)AP89021/042(21second/42second/8sectionof/31sectionofOTP(programmable)pronunciationelectriccircuit,pricelow,theperipheryelectriccircuitissuccinct.Partitionssimply,thedeliveryisquick.Doesnothavesubscribesthequantitylimit.16feet/20footDIP/SOPseal,the2.4V-3.6Vpowersupply,thebasepinandAPI8108A/840NbAP89341/170/085(341second/,170second/85second/,256sectionofOTP(programmable)pronunciationelectriccircuit,pric