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1、摘要語音信號處理屬于信息科學(xué)的一個重要分支,大規(guī)模集成技術(shù)的高度發(fā)展和計(jì)算機(jī)技術(shù)的飛速前進(jìn),推動了這一技術(shù)的發(fā)展。在數(shù)字音頻技術(shù)和多媒體技術(shù)迅速發(fā)展的今天,傳統(tǒng)的磁帶語音錄放系統(tǒng)因體積大、使用不便、放音不清晰而受到了巨大挑戰(zhàn)。本組提出的體積小巧,功耗低的數(shù)字化語音存儲與回放系統(tǒng),可以有效的解決傳統(tǒng)的語音錄放系統(tǒng)在電子與信息處理的使用中受到的限制。本文提出了以SST89E554RC芯片為核心的單片機(jī)小系統(tǒng),用它來實(shí)現(xiàn)整個數(shù)字化語音存儲與回放系統(tǒng)的邏輯控制。單片機(jī)將通過模數(shù)轉(zhuǎn)換器A/D轉(zhuǎn)換的數(shù)字信號送入
2、外部存儲器中,在回放時,單片機(jī)再從存儲器中讀出,送到數(shù)模轉(zhuǎn)換器D/A轉(zhuǎn)換成模擬信號輸出。系統(tǒng)采用了鍵盤選擇壓縮方式,在字符型顯示器上顯示,并可實(shí)現(xiàn)實(shí)時語音存儲與回放,性能穩(wěn)定,并且界面友好。多次的測試實(shí)驗(yàn)表明,本系統(tǒng)基本滿足設(shè)計(jì)要求。文中重點(diǎn)討論了小系統(tǒng)的設(shè)計(jì)過程、硬件流程和軟件的調(diào)試問題,研究了采用DPCM編碼方式以解決因存儲空間不夠而引起的存儲時間不夠的問題。關(guān)鍵詞單片機(jī)小系統(tǒng),模/數(shù)轉(zhuǎn)換,數(shù)/模轉(zhuǎn)換,程序運(yùn)行中編程,差值編碼AbstractThespeechsignalprocessingbe
3、longstoanimportantbranchofinformationscience,large-scaleintegrationtechnologydevelopmentandtheheightoftherapidprogressinthecomputertechnology,promotethedevelopmentofthistechnology.Indigitalaudiotechnologyandmultimediatechnologyrapiddevelopment,thetradi
4、tionaltapevoicerecordingsystemforlargesize,useinconvenience,playbacknotclearandahugechallenge.Groupofsmallsize,lowpowerconsumptionofdigitalvoicestorageandplaybacksystem,caneffectivelysolvethetraditionalvoicerecordingsysteminelectronicandinformationproc
5、essingintheuseofthelimit.InSST89E554RCchipisproposedinthispaperisthecoreofsinglechipprocessorsystem,usingittomakethedigitalvoicestorageandplaybacksystemlogiccontrol.AdcchipwillbethroughtheA/DconversionofdigitalsignalsintotheexternalmemorychipinAreplay,
6、andagainfrommemorytoread,dacD/Aconvertedintoanalogsignaloutput.SystemUSESakeyboard,choosecompressioninthecharacterscreendisplay,andcanrealizereal-timespeechstorageandplayback,stableperformance,andfriendlyinterface.Manyofthetestexperimentsshowthatthissy
7、stembasicallymeetthedesignrequirements.Inthispaper,thedesignprocessofsmallsystem,hardwareandsoftwareofdebuggingprocess,researchusingDPCMcodingmethodtosolvethelackofstoragespaceforstoragetimeenoughtocauseproblems.KeyWordsSinglechipprocessorsystem,A/Dcon
8、version,D/Atransformation,InApplicationProgramming,DifferentialPulseCodeModulation.目錄摘要IAbstractII目錄III1引言11.1數(shù)字化語音存儲與回放系統(tǒng)設(shè)計(jì)要求11.2系統(tǒng)方案論證12數(shù)字化語音存儲與回放系統(tǒng)硬件設(shè)計(jì)32.1語音前置放大器設(shè)計(jì)32.1.1語音輸入32.1.2雙話筒語音輸入級電路32.1.3中間放大級電路52.1.4采用儀表放大器電路作為雙話筒語音輸入放大電路72