基于LabVIEW的音频信号发生器的虚拟仪器设计

基于基于基于基于LabVIEW的音频信号发生器的虚拟仪器设计的音频信号发生器的虚拟仪器设计的音频信号发生器的虚拟仪器设计的音频信号发生器的虚拟仪器设计摘摘摘摘要要要要：：：：随着计算机与微电子技术的发展，出现了虚拟仪器。它以软件为核心，把计算机技术和仪器技术完美结合起来，充分应运飞速发展的计算机技术来实现和增强传统仪器的功能。虚拟仪器开创了仪器使用者可以成为设计者的新时代，代表了仪器发展的方向，它已成为21世纪测试技术和仪器技术发展的主要方向。本设计正是顺应仪器发展的趋势，利用图形化编程软件LabVIEW来实现虚拟音频信号发生器，真正做到“软件即硬件”。在硬件上还提出以PC声卡代替昂贵商用数据采集卡，大大降低了生产成本，实现了基于LabVIEW的常用周期信号的单通道和双通道模拟输出，使设计具有广阔的开发价值和应用前景。论文在简要介绍了虚拟仪器概念、研究现状、发展趋势以及编程软件LabVIEW特点的基础上，概述了音频信号发生器的基本原理,分析了声卡的功能及相关设置，并对构成系统的各模块做了详细叙述。关键词关键词关键词关键词::::虚拟仪器；音频信号发生器；LabVIEW；声卡VirtualAudioSignalGeneratorBasedonLabVIEWAbstract:Withthedevelopmentofcomputerandmicroelectronicstechnology,virtualinstrumentsappear.Virtualinstrumentsachievetheperfectcombinationofcomputersciencetechnologyandinstrumenttechnologythroughtakingthesoftwareasthecoretechnology.Virtualinstrumentsrealizeandenhancethefunctionsoftraditionalinstrumentsbydevelopingcomputertechnology.Virtualinstrumentsinitiatethenewerathattheinstrumentuserscanbetheinstrumentdesigners.Virtualinstrumentsrepresentthedirectionofinstrumentsandithasbecomethemaindirectionoftechnologicaldevelopmentinthe21stcenturytestingtechnologyandinstruments.ThisdesignusedgraphicalprogrammingsoftwareLabVIEWtodesignvirtualaudiosignalgenerator,exactlyadjustingthetrendoftheinstrumentdevelopment,andtrulyachievesoftwarethatishardware.Inordertoreduceproductioncostsandimplementsingle-channelanddual-channeloutputofcommonanalogperiodicsignalsbasedonLabVIEW,thedesignalsobringforwardtoreplacetheexpensivecommercialdataacquisitioncardwithPCsoundcard.Ithasbroadapplicationanddevelopmentprospect.Basedonbriefintroductionofvirtualinstrumentsconcept,presentconditions,developingtrendsandcharacteristicsofprogrammingsoftwareLabVIEW,thebasicprinciplesofaudiosignalgeneratorareoutlined,thefunctionandrelativeconfigurationsofsoundcardareanalyzed,anddetailsofeachsystemcomposingmoduleispresented.Keywords:virtualinstrument;audiosignalgenerator;LabVIEW;soundcardI目目目目录录录录1绪论...............................................................................................................................11.1课题背景...................................................................................................................11.2虚拟仪器概述以及国内外研究现状.......................................................................11.2.1虚拟仪器概述....................................................................................................11.2.2虚拟仪器国内外研究现状................................................................................31.3课题的意义...............................................................................................................41.4课题内容...................................................................................................................52系统基本功能描述及软硬件概述.................................................................................62.1系统基本功能描述...................................................................................................62.2软件LabVIEW概述................................................................................................62.2.1LabVIEW的结构..............................................................................................72.2.2LabVIEW模板分析..........................................................................................82.2.2.1工具模板（ToolsPalette）........................................................................82.2.2.2控制模板(ControlsPalette).........................................................................92.2.2.3功能模板(FunctionsPalette).....................................................................102.3硬件声卡概述.........................................................................................................112.3.1声卡工作原理..................................................................................................112.3.2声卡的工作流程..............................................................................................122.3.3声卡主要技术指标..........................................................................................123系统整体方案和各组成部分方案设计.......................................................................133.1系统整体方案设计.................................................................................................133.2波形发生部分方案设计.........................................................................................133.2.1仿真信号发生器SimulateSignal.vi..............................................................153.2.2多谐信号附加噪声的波形发生器TonesandNoiseWaveform.vi...............173.2.3公式节点产生仿真信号..................................................................................193.3声音输出部分方案设计.........................................................................................213.4图形显示部分方案设计.........................................................................................223.4.1WaveformChart...............................................................................................223.4.2WaveformGraph..............................................................................................243.4.