外文翻译--ISD25120录放音芯片介绍.doc

TheintroduceofsoundplaybackchipISD251201ISD2500serieschipProfileISDs2500serieschips,accordingtorecordingtime60seconds,75seconds,90secondsand120secondsintoISD2560,2575,2590and25120fourmodels.ISDdevicewithOVF(overflow)clientforcascadingmultipledevices.ISD2500seriesEEPROMwithcapacityfor480K,uptosub-paragraph600.Fourdifferenttypesofrecordingtimedependsondifferentinputsamplingratetoachieve,andtheywere:8.0,6.4,5.3,4.0kHz.DIPpackage28-pindevices,thepinfunctionasfollows:17A0/M0A6/M6address/modeselection810A7A9enteranaddressline11AUXINinput12,13VSSD,VSSAandanalogtodigital14,15SP+,SP-speakeroutput16VCCApoweranalogsignalpositive17,18MIC,MICREFMicrophoneinputandtheinputreferenceterminal19AGCAGC20,21ANAIN,ANAOUTAnalogsignalinputandoutputSpillage22OUF23CEchipselect(lowtoallowthechipwork)24PD-chiplow-powerstatecontrol25EOManendaudioplaybacksignaloutput26XCLKexternalclock27P/Rrecorded/releasecontroltochoose28VCCDcathodepowersupplydigitalsignal2WorkingPrinciple2500Series10inputaddressA0A9,thesiterecordedupto1024,addressspaceis01023.Itsdistributionis:Address0299asasub,anddidnotaddresstheuseof600767,7681023fortheaddressmodeselection(ie,A8,A9arehigh).AddressLine2500serieshastwopurposes,firstasamodeofcontrol,thesecondsub-recordingsoundasthestartsegmentaddress.Whenthehighestaddressbit(MSB)A8,A9arehigh(ieaddress7681023),theaddressA0A6-sideasaworkingmodelonthechoiceofclientM0M6,correspondingtosevenkindsofwork.WhentheA8,A9oranyoneforthelowlow(thatis,address0599),aslongasrecordedinthesub/playbackpre-operation(lessthan300ns)totheaddressA0A9assignmentoperationfromtheAddresstostart.2500seriesofvoicechipswillbedividedinto480KofEEPROMinformationinparagraph600,800byteseach.Unitasawhole,addressingandcontrolinformationtoeachparagraphshouldbeassignedanaddressfortheexternalcontrolratherthanforeachbyteaddressing,oratleastaddressport19.Thisgreatlyreducestheinformationneededtoretrievetheaddressline.Ofthespeechsignalcanbealongcross-sectionofanumberofinformationrecording,storageinformationfromthesectionoftheinternalconstraints,andinformationwithinthesitewillautomaticallyincreasethesegment.EachvoiceintheautomaticincreaseinthetailsectionofanendmarkEOM,whenthecombinationofplaying,bydetectingEOMtocontroltheendofthevoicesegmentandthebeginningofthenextsection.Informationsectionofeachaudioplaybacktimeequaltothetotaltimedividedby600.ISD2560,suchasthetotaltimeforthe60s,theinformationsectionofeachaudioplaybacktimeof100ms；ISD25120thetotaltimeforthe120s,eachtimeforparagraphinformation200ms.Thereforethelengthoftimecanbeusedasasegmentaddress,throughthetime-parallelsingle-chiptimertotheaddressabovemappinginformationinordertogetthestartaddressofeachrecording.Inthisway,ontheneedtosetupanaddresscounter.Generaladdressfrom0tostartrecording,firstofall,throughtheCPUassignedtoitA0A9,thenstartrecordingISDSCM,SCMtostartthetimeratthesametimethebeginningoftime,everytimeaninformationparagraph,givetheaddresscountplus1.ISDsingle-chipcontrolwhentostoprecordingatthesametimestopthetimertime.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：17A0/M0A6/M6地址/模式选择810A7A9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