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外文翻译--ISD25120录放音芯片介绍.doc

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外文翻译--ISD25120录放音芯片介绍.doc

TheintroduceofsoundplaybackchipISD251201ISD2500serieschipProfileISDs2500serieschips,accordingtorecordingtime60seconds,75seconds,90secondsand120secondsintoISD2560,2575,2590and25120fourmodels.ISDdevicewithOVFoverflowclientforcascadingmultipledevices.ISD2500seriesEEPROMwithcapacityfor480K,uptosubparagraph600.Fourdifferenttypesofrecordingtimedependsondifferentinputsamplingratetoachieve,andtheywere8.0,6.4,5.3,4.0kHz.DIPpackage28pindevices,thepinfunctionasfollows17A0/M0A6/M6address/modeselection810A7A9enteranaddressline11AUXINinput12,13VSSD,VSSAandanalogtodigital14,15SP,SPspeakeroutput16VCCApoweranalogsignalpositive17,18MIC,MICREFMicrophoneinputandtheinputreferenceterminal19AGCAGC20,21ANAIN,ANAOUTAnalogsignalinputandoutputSpillage22OUF23CEchipselectlowtoallowthechipwork24PDchiplowpowerstatecontrol25EOManendaudioplaybacksignaloutput26XCLKexternalclock27P/Rrecorded/releasecontroltochoose28VCCDcathodepowersupplydigitalsignal2WorkingPrinciple2500Series10inputaddressA0A9,thesiterecordedupto1024,addressspaceis01023.ItsdistributionisAddress0299asasub,anddidnotaddresstheuseof600767,7681023fortheaddressmodeselectionie,A8,A9arehigh.AddressLine2500serieshastwopurposes,firstasamodeofcontrol,thesecondsubrecordingsoundasthestartsegmentaddress.WhenthehighestaddressbitMSBA8,A9arehighieaddress7681023,theaddressA0A6sideasaworkingmodelonthechoiceofclientM0M6,correspondingtosevenkindsofwork.WhentheA8,A9oranyoneforthelowlowthatis,address0599,aslongasrecordedinthesub/playbackpreoperationlessthan300nstotheaddressA0A9assignmentoperationfromtheAddresstostart.2500seriesofvoicechipswillbedividedinto480KofEEPROMinformationinparagraph600,800byteseach.Unitasawhole,addressingandcontrolinformationtoeachparagraphshouldbeassignedanaddressfortheexternalcontrolratherthanforeachbyteaddressing,oratleastaddressport19.Thisgreatlyreducestheinformationneededtoretrievetheaddressline.Ofthespeechsignalcanbealongcrosssectionofanumberofinformationrecording,storageinformationfromthesectionoftheinternalconstraints,andinformationwithinthesitewillautomaticallyincreasethesegment.EachvoiceintheautomaticincreaseinthetailsectionofanendmarkEOM,whenthecombinationofplaying,bydetectingEOMtocontroltheendofthevoicesegmentandthebeginningofthenextsection.Informationsectionofeachaudioplaybacktimeequaltothetotaltimedividedby600.ISD2560,suchasthetotaltimeforthe60s,theinformationsectionofeachaudioplaybacktimeof100msISD25120thetotaltimeforthe120s,eachtimeforparagraphinformation200ms.Thereforethelengthoftimecanbeusedasasegmentaddress,throughthetimeparallelsinglechiptimertotheaddressabovemappinginformationinordertogetthestartaddressofeachrecording.Inthisway,ontheneedtosetupanaddresscounter.Generaladdressfrom0tostartrecording,firstofall,throughtheCPUassignedtoitA0A9,thenstartrecordingISDSCM,SCMtostartthetimeratthesametimethebeginningoftime,everytimeaninformationparagraph,givetheaddresscountplus1.ISDsinglechipcontrolwhentostoprecordingatthesametimestopthetimertime.Atthispointthevalueofaddresscounteristhevoiceoftheparagraphdidnotaddress,plus1underthesectionofspeechisthefirstaddress,andEEPROMinitsexistence,willbeplayingforthenextaddressinformationprovided.ThroughtheCPUassignedtotheaddressA0A9,underthesectionofyourvoicerecording.Followedit,youcanrecordvoiceaboveallatthesametimebethestartingaddressoftheparagraphs.Ifitisnotstartedfrom0voiceaboveaddress,simplyassigntheinitialaddressA0A9,withthevalueofaddresscountercanbeavoiceattheendoftheaddressabove.Nothereatthesametimetopreservethevoicesegmentstartaddressandendaddress,becauseitisadjacenttoeachparagraph,beforeparagraph1attheendoftheaddressthatisthestartingaddressofthisparagraph,andeachhaveavoiceattheendofparagraphmarkEOMmaygiveadisruption.UseitwhenplayingandstoredintheEEPROMintheinitialparagraphofthespeechaddressinanyordercombinationofvoiceaboveall.ISD25120录放音芯片介绍1ISD2500系列芯片简介ISD公司的2500系列芯片,按录放时间60秒、75秒、90秒和120秒分成ISD2560、2575、2590和25120四个型号。ISD器件设有OVF(溢出)端,便于多个器件级联。ISD2500系列片内EEPROM容量都为480K,最多能分600段。四个型号的不同录放时间是靠不同的输入采样率来实现的,它们分别为8.0、6.4、5.3、4.0kHz。DIP器件封装为28脚,各引脚功能如下1~7A0/M0~A6/M6地址/模式选择8~10A7~A9输入地址线11AUXIN辅助输入12、13VSSD、VSSA数字地和模拟地14、15SP、SP扬声器输出16VCCA模拟信号电源正极17、18MIC、MICREF麦克风输入端和输入参考端19AGC自动增益控制20、21ANAIN、ANAOUT模拟信号输入和输出22OUF溢出23CE片选(低电平允许芯片工作)24PD芯片低功耗状态控制25EOM录放音结束信号输出26XCLK外部时钟27P/R录/放控制选择

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