预览加载中，请您耐心等待几秒...

数字信号处理英文术语.pdf

预览
1/10
2/10
3/10
4/10
5/10
6/10
7/10
8/10
9/10
10/10

亲，该文档总共16页，到这已经超出免费预览范围，如果喜欢就直接下载吧～

下载提示 文本预览

如果您无法下载资料，请参考说明：

1、部分资料下载需要金币，请确保您的账户上有足够的金币

2、已购买过的文档，再次下载不重复扣费

3、资料包下载后请先用软件解压，在使用对应软件打开

DIGITALSIGNALPROCESSINGTERMINOLOGY 1/fnoise:Atypeofrandomnoisethatincreasesinamplitudeatlowerfrequencies.Itis widelyobservableinphysicalsystems,butnotwellunderstood.Seewhitenoisefor comparison. -3dBcutofffrequency:Thedivisionbetweenafilter'spassbandandtransitionband. Definedasthefrequencywherethefrequencyresponseisreducedto-3dB(0.707in amplitude). "A"law:CompandingstandardusedinEurope.Allowsdigitalvoicesignalstobe representedwithonly8bitsinsteadof12bitsbymakingthequantizationlevelsunequal. Seemulawforcomparison. AC:AlternatingCurrent.Electricaltermfortheportionofasignalthatfluctuatesaround theaverage(DC)value. Accuracy:Theerrorinameasurement(oraprediction)thatisrepeatablefromtrialto trial.Accuracyislimitedbysystematic(repeatable)errors.Seeprecisionforcomparison. Additivity:Amathematicalpropertythatisnecessaryforlinearsystems.Ifinputa producesoutputp,andifinputbproducesoutputq,thenaninputofa+bproducesan outputofp+q. Aliasing:Theprocesswhereasinusoidchangesfromonefrequencytoanotherasaresult ofsamplingorothernonlinearaction.Usuallyresultsinalossofthesignal'sinformation. Amplitudemodulation:Methodusedinradiocommunicationforcombiningan informationcarryingsignal(suchasaudio)withacarrierwave.Usuallycarriedoutby multiplyingthetwosignals. Analysis:TheforwardFouriertransform;calculatingthefrequencydomainfromthe timedomain.Seesynthesisforcomparison. Antialiasfilter:Low-passanalogfilterplacedbeforeananalog-to-digitalconverter. Removesfrequenciesaboveone-halfthesamplingratethatwouldaliasduring conversion. ASCII:Amethodofrepresentinglettersandnumbersinbinaryform.Eachcharacteris assignedanumberbetween0and127.Verywidelyusedincomputersand communication. Aspectratio:Theratioofanimage'swidthtoitsheight.Standardtelevisionhasan aspectratioof4:3,whilemotionpictureshaveanaspectratioof16:9. Assembly:Low-levelprogramminglanguagethatdirectlymanipulatestheregistersand internalhardwareofamicroprocessor.Seehigh-levellanguageforcomparison. Associativepropertyofconvolution:Writtenas:.Thisis(a[n]t