基于Multisim的模拟信号数字化系统的毕业设计

沈阳理工大学学士学位论文I摘要目前，无论是模拟通信还是数字通信，在不同的通信业务中都得到了广泛的应用。但是，数字通信由于其良好的传输性，现已成为当代通信技术的主流。本文主要讨论模拟信号数字传输，对模拟信号进行数字化，以实现高效率传输。模拟信号数字化方面，设计实现了均匀量化与编码系统、PCM编解码系统、脉幅调制系统。各个调制解调系统以Multisim软件为仿真平台，实现了模拟信号数字传输。本论文第二章介绍了电子设计自动化与仿真工具EWB的基本知识，重点介绍了Multisim仿真软件。第三章对均匀量化与编码系统进行了设计与实现，首先介绍量化、编码原理，接着进行电路设计、系统仿真。第四章对PCM系统进行了设计与实现，首先介绍PCM原理，接着进行电路设计、系统仿真。第五章对脉幅调制系统进行了设计与实现，首先介绍了PAM原理，接着进行电路设计、系统仿真。仿真实验表明，模拟信号数字化能更好的适应信道的传输，克服了诸如误码率、失真等不足。关键字：PCM系统；均匀量化与编码系统；PAM系统；Multisim软件沈阳理工大学学士学位论文IIABSTRACTAtpresent,eitheranalogordigitalcommunication,communicationindifferentcommunicationinbusinesshavebeenwidelyused.However,duetoitsgooddigitalcommunication,thetransmissionofcontemporarycommunicationtechnologyhasbecomethemainstream.Thisarticlemainlydiscussanalogsignalstosimulatedigitaltransmissionanddigitalsignals,inordertorealizeefficienttransmission.DigitalsimulationsignalandtheuniformdesignrealizequantitativeandcodingsystemsandPCMcodec,pulseamplitudemodulationsystem.EachdemodulationsystembysimulationplatformforMultisimsoftware,realizetheanalogsignaldigitaltransmission.ThispaperdescribedtheelectronicdesignautomationandbasicknowledgeofEWBsimulationtools,introducesemphaticallyMultisimsimulationsoftware.Thethirdchapterofuniformquantificationandcodingsystemsdesignandimplementation,firstintroduced,codingtheory,andthecircuitdesign,thesystemsimulation.ThefourthchapterofPCMsystemdesignandimplementation,firstintroduced,andprincipleofPCMcircuitdesign,thesystemsimulation.Thefifthchapterofpulseamplitudemodulationsystemdesignandimplementation,firstintroducedtheprinciple,PAMandcircuitdesign,thesystemsimulation.Simulationresultsshowthatthedigitalsimulationsignalcanbetteradapttothetransmissionchannel,overcomethedisadvantages,suchasdistortion,suchasadditive.Keywords:PCMsystem；Evenwiththecodingsystem,quantitative；PAMsystem；Multisimsoftware沈阳理工大学学士学位论文III目录摘要...........................................................................................................................................IABSTRACT..............................................................................................................................II目录......................................................................................................................................III1绪论....................................................................................................................................11.1课题背景和意义........................................................................................................11.2国内外研究现状........................................................................................................11.3本论文主要内容........................................................................................................22Multisim仿真软件..............................................................................................................32.1电子设计自动化与仿真工具EWB..........................................................................32.2Multisim仿真软件....................................................................................................53均匀量化和编码系统的设计与实现................................................................................103.1均匀量化和编码系统原理......................................................................................103.2电路设计..................................................................................................................153.3仿真与实现..............................................................................................................184PCM编解码系统的设计与实现.......................................................................................204.1PCM编解码系统原理.............................................................................................204.2电路设计..................................................................................................................264.3仿真与实现..............................................................................................................295增量调制系统的设计与实现............................................................................................315.1增量调制系统原理..................................................................................................315.2电路设计..................................................................................................................325.3仿真与实现..............................................................................................................37结论......................................................................................................................................39致谢......................................................................................................................................40参考文献..................................................................................................................................41附录A：英文原文..................................................................................................................42附录B：中文翻译.................................