基于LabView的声卡数据采集系统设计刘芸,孙钦利,邢俊红(710048):用计算机声卡代替普通采集卡作为硬件,用数据分析和处理功能非常强大的工程实用软件LabView作为软件开发平台,设计了一个较高采样精度中等采样频率灵活性好的声卡数据采集系统,实现了数据采集信号分析(时域分析和频域分析)及信号发生等多种功能其中,时域分析包括实时显示波形,测量信号电压频率周期等参数;频域分析包括幅值谱相位谱功率谱和FFT变换等;信号发生包括常用信号(如正弦波方波三角波等)的产生该采集系统性价比高通用性强扩展性好界面简单,在工程测量与实验室应用中具有广阔的前景:LabView;声卡;数据采集;信号分析:TP391.9:B:1004373X(2007)1417703DesignofSoundCardDataAcquisitionSystemBasedonLabViewLIUYun,SUNQinli,XINGJunhong(SchoolofMechanicalInstrumentalEngineering,XianUniversityofTechnology,Xian,710048,China)Abstract:TakingthecomputersoundcardinsteadofcurrentacquisitioncardashardwareandtheengineeringsoftwareLabViewthatdataanalysisandprocessingfunctionisverypowerfulassoftwaredevelopmentplatform,akindofsoundcarddataacquisitionsystemwithhighersamplingprecision,middlingsamplingfrequencyandbetterflexibilityisdesigned.Ithasrealizedseveralfunctionssuchasdataacquisition,signalanalysis(i.e.timedomainanalysisandfrequencydomainanalysis)andsignalgenerator.Thetimedomainanalysisincludestherealtimedisplayofthewaveform,thesignalparametermeasurementsofvoltage,frequencyandperiod.Thefrequencydomainanalysiscontainsamplitudespectrum,phasespectrum,powerspectrumandFFTtransform.Thesignalgeneratorcanproducecommonsignallikesinewave,squarewaveandtriangularwave.Thesystemhasmanyadvantages,forexample,highcostperformance,strongcommonality,goodexpansibilityandsimpleinterface.Ittakesonwiderforegroundinthefieldsofengineeringmeasureandlaboratoryapplication.Keywords:LabView;soundcard;dataacquisition;signalanalysis:20070212:(102210411)1LabViewNI,,,LabView,,,,[1]!,A/D,,,LabView,,LabView,,2(),1图1系统原理框图,A/D,,LabView;D/A,177∀#200714253衰减电路MICIN,,LINEINLINEIN1.5V,,,LINEIN放大电路,3.5V,,10V,A/D,D/A,(20Hz~20kHz)16,12,,MICINLINEIN,,20Hz,,100Hz~15kHz[2]Cmedia,CMI9761A,44.1kHz,16,,[3]3LabView,VC,VB,,,LabView,,;FFT;(),,3.1虚拟示波器的实现,,,While,2图2虚拟示波器框图程序,44100Hz16,LINEIN,3,,350%,1000Hz,1ms,1.09V图3虚拟示波器界面AutoScaleY!,,,,3.2虚拟频谱分析仪的实现,,FFT,,2,4,,Butterworth,,200kHz,50Hz,,,,,,,,图4虚拟频谱分析仪框图程序178/:LabView,44100Hz16LINEIN,5,1000HzFFT图5虚拟频谱分析仪界面3.3虚拟信号发生器的实现,While,While,,64PCLabView,100Hz~15kHzA/D,,LabView,,,,图6虚拟信号发生器框图程序参考文献[1],,,.LabView[M].:,2001.[2],,.[J].,2005,26(8):4749.[3],.LabView[J].,2005,21(9):108110.刘芸女,1980年出生,硕士,助教主要从事激光与精密测量技术方面的教学与研究工作LCOS20071~5,23257,200671.08%,1.648,200675.67%,,,,,,,(1):20071~5,CRT20844,69.15%,90%,CRT,CRT,CRT,(2):,20071~5,TCL,(3):,1~5,,18244,79%4598,415(4):LCOS,,,,摘自∀中国电子报#179∀#200714253