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1、畢業(yè)設(shè)計(jì)(論文)摘 要隨著通信、計(jì)算機(jī)網(wǎng)絡(luò)等技術(shù)的飛速發(fā)展,語(yǔ)音壓縮編碼技術(shù)得到了快速發(fā)展和廣泛應(yīng)用。尤其是最近20年,語(yǔ)音壓縮編碼技術(shù)在移動(dòng)通信、衛(wèi)星通信、多媒體技術(shù)以及IP電話通信中得到普遍應(yīng)用,起著舉足輕重的作用。人們相互交流的信息量也在不斷地急劇增加,龐大的語(yǔ)音信號(hào)數(shù)據(jù)給存儲(chǔ)和傳輸帶來(lái)了巨大的的壓力,使得信道資源變得愈加寶貴。因此,語(yǔ)音壓縮和語(yǔ)音編碼技術(shù)顯得越來(lái)越重要。本課題是基于DSP的G.711語(yǔ)音壓縮算法設(shè)計(jì)與實(shí)現(xiàn),通過(guò)DSP將采集到的語(yǔ)音信號(hào)進(jìn)行G.711壓縮算法的處理。最后通過(guò)外設(shè)輸出壓縮后的語(yǔ)音信號(hào)。最終實(shí)現(xiàn)語(yǔ)音信號(hào)的采集、壓縮與回放。本論文根據(jù)系統(tǒng)的功能需求
2、,完成了該系統(tǒng)的算法研究,軟硬件的設(shè)計(jì)。設(shè)計(jì)出了A律編解碼的軟件流程框圖,在以TMS320VC5502為處理器的硬件開(kāi)發(fā)平臺(tái)上實(shí)現(xiàn)了語(yǔ)音信號(hào)的A律壓縮解壓算法,并給出了壓縮程序流程圖。關(guān)鍵詞:語(yǔ)音壓縮編碼,G.711,DSP-2-畢業(yè)設(shè)計(jì)(論文)AbstractWiththecommunications,computernetworksofrapiddevelopment,voicecompressioncodingtechnologyhasbeenrapidofdevelopmentandwideofapplication.Especiallyinthelast20years,s
3、peechcodingtechnologywaswidelyapplicationinthemobilecommunications,satellitecommunications,multimediaandIPtelephonytechnology,itplaysapivotalrole.Peoplemutuallyexchanginginformationisincreasingdramatically,hugevoicesignaldatatothestorageandtransmissionbroughthugepressure,itmakeschannelresource
4、sbecomemoreandmorevaluable.Therefore,speechcompressandspeechcodingtechnologyisbecomingmoreandmoreimportant.ThistopicisbasedontheDSPofG.711voicecompressionalgorithmdesignandimplementation.ThecollectedvoicesignaluseG.711compressionalgorithmtotreatbyDSP.Thespeechsignalaftercompressionisoutputbyex
5、ternalequipmentsfinally.Ithasrealizedthespeechsignalcollection、compressionandplaybackfinally.Accordingtothesystem'sfunctionalrequirements,thispaperscompletehardwareandsoftwaredesignofthesystem.AlawdesignedaflowchartofthesoftwarecodecinordertoTMS320VC5502processorhardwaredevelopmentplatformfort
6、herealizationofthespeechsignalontheA-lawcompressiondecompressionalgorithms,Andgivethecompressionprocessflowdiagram.KeyWords:SpeechCoding,G.711,DSP-2-畢業(yè)設(shè)計(jì)(論文)目 錄摘 要1Abstract2引言31緒論11.1課題的背景11.2課題的意義21.3語(yǔ)音壓縮編解碼概述42語(yǔ)音壓縮的理論依據(jù)與算法52.1語(yǔ)音壓縮的理論依據(jù)52.2語(yǔ)音信號(hào)產(chǎn)生的數(shù)字模型62.3語(yǔ)音壓縮的算法82.3.1G.711語(yǔ)音編碼標(biāo)準(zhǔn)82.3.2PCM編碼8
7、2.3.3A律壓擴(kuò)標(biāo)準(zhǔn)93系統(tǒng)的硬件設(shè)計(jì)123.1電源電路133.2復(fù)位電路143.3時(shí)鐘電路153.4JTAG電路153.5語(yǔ)音采集電路173.6SDRAM電路183.7FLASH擴(kuò)展電路194系統(tǒng)的軟件設(shè)計(jì)224.1總體程序設(shè)計(jì)224.2語(yǔ)音編解碼程序設(shè)計(jì)234.3程序的調(diào)試24-2-畢業(yè)設(shè)計(jì)(論文)結(jié) 論25參考文獻(xiàn)26附錄A硬件電路圖27附錄B源程序清單28致 謝43-2-畢業(yè)設(shè)計(jì)(論文)引言語(yǔ)音是人類相互進(jìn)行交流時(shí)使用最多、最自然、最基本也是最重要的信息