SMAART vers. 7 Getting Started With Smaart 7
Transcript of SMAART vers. 7 Getting Started With Smaart 7
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Copyright 2010 Rational Acoustics LLC. All rights reserved.Rational Acoustics and Smaart are registered trademarks of Rational Acoustics LLC.
GettingStartedwithSmaartv7:BasicSetupandMeasurement
Thisguideisanintroductiontothebasicmeasurementandoperationalconcepts
embodiedinRationalAcousticsSmaartv7.Whileinnowayanexhaustivestudy,
thisdocumentservesasastartingpointforuserstofamiliarizethemselveswiththe
fundamentalsofSmaartssingleanddualchannelcapabilities,andprovide
instructionintheconfigurationandoperationofbasicmeasurementsetups.
RegardlessofpastmeasurementexperiencewithpreviousversionsofSmaart,orotheranalysissystems,usersshouldtakethetimetofamiliarizethemselveswith
theprocessofConfiguringSmaartv7forMeasurementdetailedinthisdocument.
UnlikepreviousversionswhichassumedasimpletwochannelI/O,Smaartv7caninterfacewithmultipleI/Odevicessimultaneously,eachwithmultipleinputand
outputchannels.Accordingly,Smaartv7makesnoassumptionsaboutausers
measurementrequirementsanduponfirstrun,beginsitsoperationunconfigured.
Asinpreviousversionshowever,followinginitialsetup,Smaartretainsits
measurementconfigurationforsubsequentsessions.
Pleasenote:inthecaseofthefree/publicdemoversionofthesoftware,theSmaart
measurementconfigurationisnotretainedfromsessiontosession,andmustbe
rebuiltforeachnewsession.Consideritpractice.
Thisguideassumesareaderwithabasicunderstandingofprofessionalaudioequipmentandengineeringpractices.Itconcludeswithalistofrecommended
additionalsourcesofinformationwhereuserscanfurthertheirunderstandingoftheseconcepts.
RationalAcousticsLLCisnotresponsiblefordamagetoyour
equipmentresultingfromimproperuseofthisproduct.Besurethat
youunderstandandobserveproperinputandoutputlevels,
impedancesandwiringconventionsofallsystemcomponentsbeforeattemptinganyofthemeasurementsdescribedinthisdocument.
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Copyright 2010 Rational Acoustics LLC. All rights reserved.Rational Acoustics and Smaart are registered trademarks of Rational Acoustics LLC.
TableofContents
GETTINGSTARTEDWITHSMAARTV7:BASICSETUPANDMEASUREMENT ................1
TableofContents ..................................................... ................................................................. .............................. 2
GettingStarted:LoadingandLicensingtheSoftware ................................................... ............................. 4RecommendedComputerHardware ................................................... ................................................. ......................... 4RegisteringtheSoftware ............................................................ ................................................. ........................................ 4
FundamentalConcepts ..................................................... ................................................................. ................... 5SingleChannelvs.DualChannelMeasurements................... .................................................. ................................. 5TimeandFrequencyDomainAnalysis ........................................................... ................................................. .............. 6FFTs ....................................................... ................................................. ........................................................ .............................. 7Smaartv7sObjectOrientedProgramArchitecture ........................................................... .................................... 8
ConfiguringSmaartv7forMeasurements ........................................................... .......................................... 8ConfiguringAudioI/ODevices ....................................................... .................................................. ................................ 9ConfiguringMeasurementGroups .......................................................... ................................................. .....................10
TheSmaartv7GUI(GraphicalUserInterface) ..................................................... ..................................... 12OperationModes...................................................................................................................................................................12 GUIOverviews........................................................................................................................................................................13 Navigation................................................................................................................................................................................14
SpectrumMeasurements ........................................................... ................................................................. ...... 16SpectrumControls................................................................................................................................................................16 RTA..............................................................................................................................................................................................16 Spectrograph ....................................................... ................................................. ........................................................ ..........17
ApplicationExamples ........................................................ ................................................. ................................................18
TransferFunctionMeasurements ...................................................... ........................................................... 21Magnitude ................................................... ................................................. ............................................................ ................22Phase .................................................... .................................................. .......................................................... ..........................22Coherence ................................................... ................................................. ............................................................ ................23TransferFunctionControls ..................................................... ................................................. ........................................23LiveIR........................................................................................................................................................................................24 DelayLocator/DelayTracking......................................................................................................................................25 ApplicationExample:SettinganEqualizerforaLoudspeaker.........................................................................25
DataManagement.. ........................................................... ................................................................. .................. 28
ImpulseResponseMeasurements ...................................................... ........................................................... 29ImpulseResponseControls..............................................................................................................................................29 Log/Lin/ETCViews ............................................................. .................................................. ..............................................31FrequencyDomainView....................................................................................................................................................31 IRModeSpectrograph........................................................................................................................................................33
Appendices ..................................................... ................................................................. ...................................... 35HotKeys(AcceleratorKeys)............................................................................................................................................35 SelfHelp:WheretogoforAnswers..............................................................................................................................36
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Copyright 2010 Rational Acoustics LLC. All rights reserved.Rational Acoustics and Smaart are registered trademarks of Rational Acoustics LLC.
RecommendedReading .................................................. .................................................. .................................................36
Figure1:DualChannelvs.SingleChannelMeasurementsinTimeDomainvs.
FrequencyDomain........................................... ............................................. .................................. 7
Figure2:TransferFunctionsMTWvs.Single16kFFT ............................................. ............. 8Figure3:OptionsMenu ........................................... ............................................. .................................. 9
Figure4:OptionsAudioI/O.............................................................................................................10
Figure5:GroupManagerButton......................................................................................................10
Figure6:TheGroupManagerDialogapowerfulinterfaceforconfiguring,
controllingandadaptingourmeasurementsystem. .......................................... ...........11
Figure7:InputButtoncreatesanewsinglechannelmeasurement. ............................11
Figure8:NewPaircreatesanewdualchannelmeasurementobject...........................11
Figure9:GroupTabViewsectionoftheGroupManagerdialogshowingliveaverage
setup....................................................................................................................................................12
Figure10:TheSmaartv7InterfaceRealTimeMode...........................................................13
Figure11:TheSmaartv7UserInterfaceImpulseAnalysisMode ..................................14Figure12:PlotTypeSelectionforRealTimeModeDataWindows .................................14Figure13:WindowLayoutButtonsforRealTimeMode......................................................15
Figure14:PreSetViews ......................................... ............................................. ................................15
Figure15:SpectrumControlStrip...................................................................................................16Figure16:GlobalSpectrumSettingsfromGroupManager ....................................... ...........16
Figure17:SpectrumRTAScaleandAveragingAdjust.........................................................17
Figure18:SpectrographThresholds ....................................... ............................................. ..........17
Figure19:SpectrographSettingsinSpectrumOptions ....................................... ..................18
Figure20:SystemConfigurationforMonitoringFeedback..................................................19
Figure21:FeedbackDisplayedinRTAandSpectrographPlots.........................................19
Figure22:CombFilterInteractionPatternsViewedintheSpectrographPlot ...........20Figure23:SystemConfigurationforInteractionStudy..........................................................20
Figure24:TransferFunction ....................................... ............................................. .........................21
Figure25:TransferFunctionMagnitudeTrace ........................................ .................................22
Figure26:TransferFunctionPhaseTrace ........................................... ........................................22
Figure27:TransferFunctionCoherenceTrace.......................................................................23
Figure28:TransferFunctionControls...........................................................................................23Figure29:Smoothing ....................................... ............................................. ........................................24
Figure30:LiveIRSettings...................................................................................................................24
Figure31:LiveIRWindow..................................................................................................................25Figure32:TFControlObject ........................................ ............................................. .........................25
Figure33:TransferFunctionSampleConfiguration.............................................................26Figure34:InitialTransferFunctionMeasurementLoudspeakerandEQ ...................27
Figure35:TransferFunctionMeasurementInitialSpeakerResponse(Stored),EQ
Trace(inverted)andEqualizedSpeaker.............................................................................27
Figure36:DataStorageStrip ....................................... ............................................. .........................28
Figure37:Data"ToolTip"Information.........................................................................................28
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GettingStarted:LoadingandLicensingtheSoftwareToinstallSmaartv7onacomputer,theuserrunstheWindowsinstaller(for
WindowsOSs)ordragsthesoftwareapplicationbundleintoyourapplications
folder(MacOSs).
RecommendedComputerHardware
WhileSmaartv7willoperateonawiderangeofcomputerhardwareconfigurations,
werecommendthefollowingminimumcomputerconfigurationfornew
installations:Windows
OperatingSystem:MicrosoftXP,VistaorWindows7(32&64bit)
CPU:2GHzDualCoreIntelProcessororfaster(orcompatible)
RAM:2GBorgreater
Video:Graphicsprocessorwith128MdedicatedvideoRAM,minimum1024x600pixeldisplay
SoundHardware:AudioHardwarewithOScompatibleASIO,Wav/WDMdrivers.
MacintoshOperatingSystem:MacOSX10.5or10.6(LeopardandSnowLeopard)
CPU:2GHzDualCoreIntelProcessororfaster(orcompatible)
RAM:2GBorgreater
Video:Graphicsprocessorwith128MdedicatedvideoRAM,minimum1024x600pixeldisplay
SoundHardware:AudioHardwarewithOScompatibleCoreAudiodrivers.
RegisteringtheSoftware
Followinginitialinstallation,onfirstrunofthesoftware,theuserispresentedwith
anactivationscreencontainingthatcomputers10digitMachineIDandisasked
foranActivationCodetoauthorizethisinstallation.ThisMachineIDisauniquecodeforthatidentifiesthatcomputer.Likewise,theActivationCodeisauniquecode
thatwillonlyworkforthecomputerwiththatMachineID(muchthesameas
SmaartLivev5sPIC).
Iftheinstallationisonacomputerthatisconnectedtotheinternet,theusercanchoosetheActivateOnlineNowoptiontoacquirethenecessarycodeandactivate
theinstallation.Otherwise,theusershouldmakenoteoftheMachineIDandaccess
Smaartslicensingsystemathttp://my.RationalAcoustics.comviaanothercomputer
toacquirethenecessarycodetoactivatethisinstallation.
Ineithercase,theusermustentertheirSmaartv7licensenumber(20alpha
numericcharacters:XXXXXXXXXXXXXXXXXXXX),andthepasswordfortheuser
accounttowhichthelicenseisregistered.IftheSmaartv7Licensehasnotyetbeen
registeredtoauseraccount,theusermustfirsteithercreateanewaccountand
password,orchooseanexistingaccounttoregisteritto(i.e.yourSmaart6licenseaccount.)EachlicenseofSmaartv7allowsfortwoinstallationsofthesoftware.
UsersmaypurchaseadditionalinstallationsforanylicensebycontactingRational
Acousticsorauthorizedrepresentative.
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Copyright 2010 Rational Acoustics LLC. All rights reserved.Rational Acoustics and Smaart are registered trademarks of Rational Acoustics LLC.
Note:Smaartsoftwareislicensedtoasingleuserdefinedaseither
asinglepersonorcompany.Allsoftwareinstallationsforagiven
licensemustbeperformeduponcomputersownedbythatuser.
FundamentalConceptsDependingupontheapplication,operatingSmaarteffectivelyrequiresaworking
understandingofwiderangeofsystemmeasurementconceptsandprofessional
audioengineeringpractices.Whileitisoutsidethescopeofthisdocumenttocover
themall,thissectionhighlightsafewcriticalconceptsthatwillsignificantlyassistin
understandingSmaartv7soperationanditsapplication.
Thisdocumentincludesanappendiceswhichhasalistofrecommendedadditionalsourcesofinformationwhereuserscanfurthertheirunderstandingofthese
concepts.
SingleChannelvs.DualChannelMeasurements
Initsessence,Smaartperformstwodistincttypesofmeasurement:singlechannel
(signalanalysis)anddualchannel(responseanalysis).
Singlechannelmeasurementsexamineasignalatsinglepointinasystem,andcould
bestbedescribedassignalanalysismeasurements.Theseoperationsquantify
aspectslikesignallevelandfrequencycontent,andappearinSmaartasSpectrum
(RTAandSpectrograph)andSPLmeasurements.Withsinglechannel,theuser
acquiresasignalviaanelectricalprobe(signalsplit)oranacousticalprobe
(microphone),andexaminesthecontentofthatsignaldirectly.Singlechannelmethodsprovideanabsolutemeasurement,andhelptoansweranengineers
questionslikehowmuch1kHzenergyisinthatsignal?whatisthatfrequency?orwhatistheSPLatthisplaceinthevenue?.
Dualchannelmeasurementscomparetwosignalsinordertoexaminethe
relationshipbetweenthem.InSmaartsimplementations,wecomparetheinput
signalofasystem(reference)toitscorrespondingoutputsignal(measurement)toexaminewhatthesystemisdoingtothesignalsthatpassthroughit.Thesecould
bestbedescribedassystemresponsemeasurements,andinSmaart,werelyon
dualchannelmethodstomeasurebothasystemsfrequencyresponse(transfer
function)andimpulseresponse.Dualchannelmethodsprovidearelativemeasurement(inputvs.output),andhelptoanswerquestionslikewhatisthe
crossoverfrequencyinoursystemhowmuchboost/cut?orwhenistheenergy
frommymainspeakerarrivingatthemic?
Bothtypesofmeasurement,singleanddualchannel,areextremelypowerfultools
fortheaudioengineerwhounderstandstheirindividualstrengthsandweaknesses
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Copyright 2010 Rational Acoustics LLC. All rights reserved.Rational Acoustics and Smaart are registered trademarks of Rational Acoustics LLC.
whounderstandwhattheyaremeasuring,andjustasimportantly,whattheyare
not.Fartoooften,baddecisionswhenusingananalyzeraretheresultofengineers
confusing/conflatingthesemeasurementtypes.
InSmaartv7,themeasurementprocessbeginswiththegroupconfigurationprocesswherewedictatewhatsinglechannel(Spectrum)anddualchannel(Response)measurementswewishtouse.
TimeandFrequencyDomainAnalysis
AbasicunderstandingoftherelativestrengthsanddifferencesbetweenTimeandFrequencyDomainanalysisiscriticaltoleveragingthemeasurementpower
presentedinSmaart.Asproblemsolvingengineers,theabilitytoexaminea
measurementfrommultipleperspectives(domains)isextremelyusefulinthe
processofanalyzingasignalorsystemresponse.EachofSmaartv7sprimary
modesofoperation(RealTimeandImpulseAnalysis)includebothTimeand
FrequencyDomainmeasurementviews.
TimeDomainanalysisrefersexaminingoursignalsandsystemresponseovertime.
Atimedomainplot(amplitudevs.time)ofasignalprovidesaviewofthewaveform
acriticalviewforsoundeditors.Atimedomainviewofasystemresponse
(impulseresponse)showsthesignaldelaythroughthesystem,andwhetherany
latearrivingmultiplesofthesignal(reflections/reverberence)arepresent.
FrequencyDomainanalysisreferstoexamingoursignalsandsystemresponses
overfrequency.Afrequencydomainplot(amplitudevsfrequency)ofasignal
providesaviewofitsspectrumanextremelyhelpfulviewwhenidentifyingtonal
contentorlookingforfeedback.Afrequencydomainviewofsystemresponse(transferfunctionorfrequencyresponse)providesanexcellentlookatthetonalresponseofasystemaswellasitstime/phaseresponsebyfrequency.
Inthefigurebelow,anexcellentexampleofthepowerofutilizingbothtimeandfrequencydomainviewsforexaminingsystemresponseisclearlydisplayed.The
FrequencyResponsemeasurementdepictsaresponsewithaseriesoflinearly
spaceddipsandpeaksinitsmagnitudetrace(lowertrace).Howeverthatrippleis
thesymptomthecauseofthisripplecanbeclearlyseenintheTimeDomainview
ofthesystemresponseanobvioussecondarrivalintheimpulseresponseisthe
sourceofthecombfilterrippleseeninfrequencydomain.
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Figure1:Dual-Channelvs.Single-ChannelMeasurementsinTimeDomainvs.FrequencyDomain
FFTs
SmaartusesFastFourierTransforms(FFTs)andInverseFourierTransforms(IFTs)
totranslatedatabetweenTimedomainandFrequencydomainviews.Ineffect,anFFTtakesasectionofaTimedomainwaveformandprovidesthefrequencycontent
ofthatselectedpieceofsignal.Whilearigorousunderstandingofthismathematical
processesisnotrequiredtooperateSmaart,itisusefultoappreciatetheinversely
proportionalrelationshipbetweendatainthetwodomains,whereFrequency
Resolution=1/TimeConstant(FR=1/TC).Inotherwords,toincreasethe
resolutionofspectrumdata,onemustuselargertimeslicesoftheinputsignal.
OfparticularnotehereisSmaartv7sdefaultFFTsettingforTransferFunction
measurements,MTW(MultiTimeWindow.)InsteadofusingoneFFTofasingle
fixedlength,MTWusesmultipleFFTsofdecreasinglengthwithincreasing
frequency.Thisefficientprocessprovidestransferfunctiondatawithaconsistentresolutionofgreaterthan48thoctaveabove60Hzwithacoherencefunctionthatis
increasinglysensitivetolatereflectivedatainthehigherfrequencies.Thefigurebelowshowsacomparisonofthesametransferfunctionmeasurementmadewith
MTWvs.asingle16kFFTsettings.NoticethatMTWFFThasbetterresolutioninthe
LFwhilethe16ktracehasexcessresolutionintheHF.
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Figure2:TransferFunctions-MTWvs.Single16kFFT
Formoreinformationonthissubject,anindepthtreatmentofFFTscanbefoundin
theSmaartLiveTechNoteFFTFundamentals.
Smaartv7sObjectOrientedProgramArchitecture
OneofthemostpowerfulaspectsofthenewSmaartv7platformisitsobject
orientedprogramarchitecture.Effectively,theprogramisbuiltofmanyindividualcodemodulesthatarerunasindependent,interrelatedprograms(objects).
Dataacquisitionishandledbytheinputmodule(s),singlechannelanddualchannel
measurementsarehandledbyindividualspectrumandresponseobjects,andthegraphingandGUI(graphicuserinterface)aretheirownseparateobjectsaswell.
Thisarchitecturecreatesameasurementenvironmentthateasilyscalabletoa
usersindividualrequirements.Ineffect,youcanrunasmanysimultaneoussingle
channel(spectrum)anddualchannel(response)measurementsasyourPCand
audioI/O(Input/Output)hardwarewillallow.
ThisalsomeansthatSmaartsmeasurementplotsareseparateobjectsfromthedata
theygraph.Theimmediatebenefitofthisrelationshipistheusersabilitytochange
displayparameters(smoothing,banding,spectrographrange,coherenceblanking,
tracecolor)ontheflywithouthavingtorecalculate/remeasurethedataforthe
newdisplayparameters.
ConfiguringSmaartv7forMeasurementsThemeasurementprocesswithSmaartv7beginswiththeconfigurationofsingle
channel(spectrum)anddualchannel(response)measurements.Thissection
detailstheprocessandfunctionsinvolvedinconfiguringthesoftwarefor
measurement.
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UnlikepreviousversionsofthesoftwarewhichassumedasimpletwochannelI/O,
Smaartv7caninterfacewithmultipleI/Odevices,eachwithmultipleinputand
outputchannels.Accordingly,Smaartv7makesnoassumptionsaboutausersI/O
capabilitiesandmeasurementrequirements,andsouponfirstrun,beginsitsinitial
operationunconfigured.Asinpreviousversionshowever,followinginitialsetup,Smaartretainsitsmeasurementconfigurationforsubsequentsessions.
Note:inthecaseofthefree/publicdemoversionofthesoftware,
Smaartsmeasurementconfigurationisnotretainedfromsessionto
session,andmustberebuiltforeachnewsession.
Smaartv7isabletoacquireinputsignalsfromanydeviceswith.wav,CoreAudio,or
ASIOdriversthatarerecognizablebythecomputersOperatingSystem(OS).Infact,
itcangrabmultiplesignalsfrommultiplesourcessimultaneously.(Note:onlyone
ASIOsourcecanbeaccessedatatime)
WhenSmaartv7starts,theuserispresented
withthissplashscreen.Whilethisis
displayed,SmaartcheckstoseewhatI/O
devicesareavailabletoyourOS.ItisherethatSmaartbuildsitslistofinputdevices,
andonceadevicehasbeendiscovered,itwillcontinuetoshowupforconfigurationin
subsequentrunsevenifitisnotconnected
atlaterstartups.
Note:WhileanI/OdevicemayshowupinSmaartslistofconfigurable
devices,itmustbeconnectedtoyourcomputeratthetimeofstartup
tobeaccessibleduringprogramruntime.
ConfiguringAudioI/ODevices
Whilethisconfigurationisnotrequiredtousedevicesincreatingandperforming
measurements,I/Odevice(s)canbeconfiguredbytheuserintheI/OOptions
dialog.Thisconfigurationcomprisesadjustingthedevicessamplerate,bitdepth,
andassigningthedeviceanditschannelsfriendlynamesnamesthathelpusersidentifysignalsanddevicesastheyconfiguretheirindividual
measurements.
TheAudioI/OOptionsDialogueisaccessedviatheOptions
Menuorbyusingthehotkeycommand[Opt+A](HotKeysare
Smaartsbuiltin,keyboardbasedcommands).
Figure3:OptionsMenu
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Options:AudioI/Odialog
Userselectsdevicefromthedropdown
list(populatedatstartup).
Usercanassignfriendlynamestothedeviceandindividualchannels.
Note:Remembertopress[enter]after
typingfriendlynames,ortheywillnotbe
retained.
ConfiguringMeasurementGroups
ToperformmeasurementswithSmaartv7,ausermustconstructtheir
measurementconfiguration.Remember,insteadofafixedmeasurementtopology,Smaartv7sobjectorientedarchitectureallowsausertoconfigureasmanysingle
channel(Spectrum)anddualchannel(Response)measurementobjectsasthey
wishfromtheAudioI/Ochannelsavailable.Moreover,thesemeasurementscanbe
runeitherindividuallyorsimultaneously,dependingupontheusersrequirements.
Inordertostructureandmanageourconfiguration,weorganizeour
measurementsintoSpectrumandResponseGroups.Thisis
accomplishedintheGroupManagerOptionsDialogwhichisaccessedeitherviaOptionsMenu,byusingthehotkeycommand[Opt+G],or
byclickingontheGroupManagerbuttonlocatedinthemeasurement
controlsareaoftheuserinterface.
Figure5:Group
ManagerButton
Figure4:Options-AudioI/O
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FromtheGroupManagerDialog,auserdefinestheirmeasurementobjectsand
organizesthemintogroups.
Theleftsideofthisdialogisdedicatedtoatreeviewofthemeasurement
configuration.Hereone
views/creates/copies/deletesSpectrumandResponse
groupsandviewsthe
individualmeasurements
assignedtoeach.
Thistreealsoactsasthe
navigation/selectorfortheGroupTabViewontheleft
sideofthisscreen.
Onceagrouphasbeencreated,ausercanselectitfromthetreeandadda
measurementtothegroupbyclickingontheNewInput(Spectrum)orNewPair(Response)button.
Whenconfiguringanewsinglechannel
measurementwithinaSpectrumgroup,theuserselectsthedesiredI/Odeviceand
inputchannel.Whenconfiguringanewdualchannelmeasurementwithina
Responsegroup,theuserselectsthedesiredI/Odeviceandameasurementandareferencechannelforthatobject.Inbothcases,thedropdownmenuswillshow
friendlynamesforthedeviceandinputchannelsthatwereconfiguredforthat
device.
Note:Meas.AndRefchannelsforaResponsemeasurementmustbe
selectedfromthesameI/Odevice.
Figure6:TheGroupManagerDialog-apowerfulinterfacefor
configuring,controllingandadaptingourmeasurementsystem.
Figure7:InputButton-createsanew
single-channelmeasurement. Figure8:NewPair-createsanewdual-
channelmeasurementobject.
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FromtheTabViewsectionoftheGroup
Managerdialog,ausercanorganizeeach
measurementgroup;adjusttheorderthat
eachappearsinonthemainUI,changetheselectedinputsignals,set/changethenameandcolorforeachtrace,and
configureliveAveragemeasurements
(usingtheNewAveragebutton.)LiveAveragesaremeasurementswhichare
calculatedfromaveragesofotheractive
measurementsinthatgroup.
EachmeasurementobjectconfiguredintheGroupManagerDialogisbasicallya
completeSmaartmeasurementengineinitselfeachwithitsowndefinablesetof
measurementparameters.Consequently,eachobjectinthegrouphasitsownTabinthisviewwhereuserscanaddressthoseindividualmeasurementparametersif
required.Theglobalandindividualcontrolofmeasurementparametersfromwithin
theGroupManagershallbecoveredinmoredetailforeachtypeofmeasurement
laterinthisdocument.
Note:Whileitisrelativelyeasytoconfigureandsimultaneouslyrunmultipleresponsemeasurements,itisHIGHLYrecommendedthatnew
(andevenexperienced)usersstartwithsimpleconfigurationsand
buildupslowlyastheygetusedtomanagingmultiplesimultaneous
measurements.
TheSmaartv7GUI(GraphicalUserInterface)ThissectionprovidesabasictouroftheSmaartv7userinterfaceandreviewsits
primarynavigationaltoolsandconcepts.Asthefeaturesetandfunctionalityofv7expands,thiswillalwaysbeanareaofcontinualenhancement,however,the
standardlayouts,navigationtoolsandparadigmsdetailedherewillstillpersist.
OperationModes
Smaartoperatesintwodistinctmeasurementmodes:RealTimeandImpulse
Response.Whilebothmodeshavetheabilitytoactivelymeasureanddisplay
frequencydomainandtimedomaindata,thefundamentaldistinctionbetweenthesemodesistheiroperationalfocus.RealTimemodeisdesignedasanenvironmentfor
efficientlymeasuringandcapturingspectrumandresponsemeasurementsofteninmultiplesspecificallyoptimizedforinsitusystemalignmentandmix
engineeringwork.ImpulseResponsemodeisdesignedtoprovidearobustand
intuitivesetoftoolsformeasuringandexaminingtheacousticalresponseof
systemsandenvironments.Smaartv7sImpulseResponsemodehasbeen
Figure9:GroupTabViewsectionoftheGroup
Managerdialogshowingliveaveragesetup
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significantlyexpandedfrompastversions(andwillcontinuetoexpand)toinclude
muchofthefunctionalityfromtheSmaartAcousticToolssoftwarepackage.
GUIOverviews
ThegenerallayoutoftheGUIforRealTimeandImpulseResponsemodes:
Figure10:TheSmaartv7Interface-Real-TimeMode
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Figure11:TheSmaartv7UserInterface-ImpulseAnalysisMode
EachmodecontainsaControlStripontherightsideoftheinterface,andtheRealTimemodeincludesaDataStorageareaonitsleftside.Themajorityofeachmodes
GUIhoweverisdedicatedtotheplotarea.Theuppermostportionofthissectionis
devotedtoacursorreadoutthatdisplaysthecoordinatesofthemousecursorin
amplitude,frequencyortimeunits,dependingonthecharttype,whenthemouse
cursorispositionedoveranyofthemaindataplots.
Navigation
Therearethreebasicelementsinnavigating,controllingandconfiguringSmaartv7:
GUIviamousecontrols,menus/optiondialogs,andhotkeys.Inmostcases,thereare
multiplewaysofcontrollingthesamefunctionthisisparticularlyimportantfor
usecaseswhereonemethodispreferableoveranother(e.g.auseroperatingona
tabletcomputerwherekeyboardcontrolarenotconvenient.)Acomplete,current
listingofthehotkeyfunctionsisalwaysavailableinthesoftwareshelpfiles.
Thatsaid,Smaartv7sGUIisbuiltformousebasedcontrolasitsprimaryinteractionmodeeitherthroughbuttonsanddata
fieldsinthecontrolstripanddataareas,orthroughclickanddragcontrolsinthedataplotareas.Manyofthevarious
controlsforeachmodewillbecoveredinthespecificsections
ofthisdocumentthatdealwiththespecificmeasurementtypes.
Herehowever,wewillcoverthecontrolsthatdeal
specificallywithmeasurementandmodeselection,and
viewcontrol.
Figure12:PlotTypeSelectionfor
Real-TimeModeDataWindows
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MeasurementSelection:
Inthedatawindowsforbothmodes,theusercanselectthemeasurement/plottype
thatisdisplayedineachwindowbyselectingadropdownmenufromtheplottype
labelintheupperleftcorneroftheplot.WindowLayoutSelection:
Layoutselectorbuttonsinthecontrolstripsetthe
numberofdatawindows(1or2)andinthecaseofTransferFunctiondisplays,toggledisplayofthe
optionalliveimpulseresponse(LiveIR)display.
Whenoperatingwithasplitdisplay,oneofthetwo
mainchartsisconsideredtheactive,orselectedchart.
Thecolorofthemarginssurroundingtheplotindicateswhichofthetwois
currentlyselected.
Note:TheControlStripandDataStorageareasintheRealTimeMode
alwayscorrespondwiththeactivedatawindowmeasurementtype.
DirectlyabovetheWindowLayoutbuttonsintheRealTime
Modearetwobuttonsthatrecallstandard,preset
measurementviews.TheSpectrumbuttondisplaysasingle
plotwindowwithRTAasthechosendatatype.TheTransferbuttonsswitchestoatwowindowdisplaywithPhasedisplayedintheupper
windowandMagnitudeinthelower.
ModeSelection:
UserscantogglebetweenmeasurementmodesusingeithertheModebuttonsinthe
controlstrip,viatheModemenu,orbyusingthe[I]and[R]hotkeys.
Zooming:
Userscanzoominanyofthedatawindowsbyusingarubberbandzoombyeither
holding[command]+(leftbutton)clickinganddragging,or(rightbutton)clickinganddraggingazoomareaontheplot.Hotkeysarealsoavailableforzoom
commands.
Note:ClickingontheX(horizontal)orY(vertical)axisofanydataplot
willresetitszoomrangestodefault.
Figure13:WindowLayoutButtons
forReal-TimeMode
Figure14:Pre-SetViews
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SpectrumMeasurementsSmaartssinglechannelSpectrummeasurementsallowausertoexaminethe
spectralcontentofaudiosignalsthroughouttheirsystem.Thesemeasurementsare
extremelyusefulinmanyapplications,includingthelocationoffeedback
frequenciesinsoundreinforcement,noiseandsoundexposuremeasurements,cinemasystemoptimization,aswellasgeneralsignalmonitoringtasks.
DatafromSmaartsSpectrummeasurementsareviewableasastandardRTA(Real
TimeAnalyzer)plots,orgraphedovertimeinathreedimensional(levelvs.
frequencyvs.time)Spectrographplot.
SpectrumControls
Onceconfigured,
individualSpectrummeasurementsappearas
elementsintheSpectrumcontrolstrip.Here,the
usercanchoosewhich
measurementstoactively
run ,monitortheinput
levelofthesignal,andshow/hidethetrace.
GlobalSpectrumSettings:Bydefault,allSpectrumobjectsusethesameglobal,userconfigurable
measurementanddisplayparameters(FFT,Averaging,WeightingandScale).The
globalScaleandAveragingsettingscanbeadjusteddirectlyfromtheSpectrum
ControlStrip,whileallglobalsettingscanbeaddressedintheGroupManager
dialog.
Moreover,Averagingand
Weightingcansetseparatelyfor
eachmeasurement(ifdesired)
intheindividualmeasurementstabinthe
GroupManagercontrols.
RTA
Therealtimeanalyzer,orRTA,isafamiliartooltoaudioprofessionals.Byadjusting
thescaleandaveraging,auserisablerefinetheirmeasurementsresolutionand
responsivenesstofitthetaskathand.
Figure15:SpectrumControlStrip
Figure16:GlobalSpectrumSettingsfromGroupManager
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Figure17:SpectrumRTA-ScaleandAveragingAdjust
Spectrograph
WhiletheRTAhashistoricallybeen,byfar,themostcommonlyusedviewofa
Spectrumforprofessionalaudioengineers,anotherwayofdisplayingthisdatais
extremelyilluminatingandhas
beencommonlyappliedforyears
inthefieldsofvoicerecognition,
vibrationanalysisandunderwateracoustics(on
submarines).Smaarts
Spectrographdisplay(orSpectrogram,asitismore
generallyknown)isaplotofasignalsspectrumovertime.This
hybriddisplaygraphsa
continuousseriesofSpectrummeasurementswithfrequencyon
oneaxis,timeonanother,and
levelindicatedbythetracecolor.InSmaart,thisgraphis
fundamentallygovernedbysetting
thethresholdlevelatwhichdatabeginstoappearonthegraph.Whenafrequency
bandinthespectrumisoverthelowerthreshold,itshowsupontheplot,starting
withadarkbluecoloratlowerlevels,andtransitioningthroughgreen,yellow,
Figure18:SpectrographThresholds
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orangeandredwithhigherleveleventuallyshowingupaswhiteifthelevel
reachesorexceedstheupperthreshold.
Thekeytocreatingausefulspectrographisinsettingthedynamicrangeforthe
displayinsettingthethresholdsforshowing/hidingthespectraldata.Settherangetoowideandthedisplaylosesdefinition,andimportantfeaturesmaygetlost.Setittoonarroworthelowerthresholdtoohighanddatamightgetmissed
altogether.
OneofthepowerfulnewfeaturesinSmaartv7istheThresholdAdjustmentHandles
thatareavailableontheleftaxisofRTAandSpectrographplots.Withthese
controls,ausercanadjustspectrographthresholdsdynamicallywithouthavingtoreacquirethedata.
Moreover,Smaartv7s
spectrographretainsahistoryofthelastxslices(spectrum
measurements),andausercan
scrollthedisplaybackthrough
olderdatainthehistoryifithas
passedoffofthedisplay.Auser
canaccessandadjustthesizeofthishistoryfile,aswellasthedisplaywidthforeachslice,intheSpectrumOptionsdialog.
Note:Smaartonlygraphsdatafromtheactivespectrummeasurementevenifmultiplesingle-channelmeasurementsare
runningsimultaneously.
ApplicationExamples
Whatfollowsaretwoexamplesofspectrummeasurementsusedincommon,realworldapplications.ThefirstusesbothRTAandSpectrographforexamining
frequencycontentspecifically,inidentifyingfeedbackfrequencies.Thesecond
usesthespectrographtoexamineinteractionpatterns(combfiltering)thatare
causedbydirectsoundinteractingreflectionswithnearboundaries.
FeedbackIdentification:Inthisexample,avocalmicrophoneisroutedthroughasimplesoundsystem.For
ourSpectrummeasurementweacquiretheoutputsignalofthemixingconsole.
Figure19:SpectrographSettingsinSpectrumOptions
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Thevocalmicgainis
raiseduntilweget
feedback.
Thefeedbacktonecan
beidentifiedasaverticalbarat1.24kHz
intheRTAdisplay.
However,becausethereisalsoother
signalgoingthroughthesystematthesame
timeasthefeedback,it
iseasiertodistinguish
theverticallineofthe
constantfeedbacktone
intheSpectrograph
plot.
Figure21:FeedbackDisplayedinRTAandSpectrographPlots
Figure20:SystemConfigurationforMonitoringFeedback
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ExaminingInteractionPatternswithSpectrograph:ThefollowingisasimpletechniquethatusestheSpectrographforexamining
coverageandinteractionpatternsinloudspeakersystems.Simplyput,theuser
excitesthesystemwithpinknoisewhichshouldproducearelativelyconstant
level/coloratallfrequenciesonaspectrographplotandthenmovesthe
measurementmicthroughthelisteningenvironment.Levelvariationsfrominteractions,liketheaudiblecombfilteringcausedbyreflections,canbeseenas
interactionpatternsonthespectrographplotofthemicsignal.Adjustingthe
dynamicrangehelpstobetterhighlighttheinteractionpatterns.
Figure23:SystemConfigurationforInteractionStudy
Figure22:CombFilterInteractionPatternsViewedintheSpectrographPlot
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TransferFunctionMeasurementsTransferFunctionisadualchannelmeasurementthatdeterminesasystems
frequencyresponsebycomparingitsinputsignal(reference)toitsoutputsignal(measurement).Thismeasurementshowsthedifferencebetweenthosetwosignals
inbothmagnitudeandphaseandrepresentstheprocessingbehaviorofthesystem
asafunctionoffrequency.
Figure24:TransferFunction
SmaartsTransferFunctionmeasurementallowsausertoexaminethefrequency
responseofvariouscomponentsoftheirsoundsystem,bothelectrical(EQs,mixers,
processors)andelectroacoustical(loudspeakers,theirenvironmentandtheirdrive
electronics).Thesemeasurementsareextremelyusefulinmanyapplications,
includingloudspeakerdesign,equipmentevaluation,equalizationandsystem
optimization.
DatafromSmaartsTransferFunctionmeasurementsareviewableasfourseparate
traces,onthreeseparateplots/windows:magnituderesponseandcoherence(same
window),phase,andliveIR(timedomainplot).
Note:AstoredTransferFunctionmeasurementcomprisesthe
Magnitude,PhaseandCoherencetracesLiveIRisnotcaptured.
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Magnitude
TheMagnitudewindowshowsboththeMagnitudeportionofthetransferfunction
(frequencyresponse),andtheCoherencetrace(seebelow).Inthemagnitudeplot,
gainandlossshowupasdeviationfromthecenter0dB
line.
Figure25:TransferFunctionMagnitudeTrace
Theusercanclickanddragamagnitudetraceupanddowntomoveitverticallyon
theplot.
Phase
ThePhaseplotdisplaysthePhaseportionoftheTransferFunctionmeasurement.
Thisplotshowsthedifference(indegrees)betweenthereferenceandmeasurement
signals,andprovidesanindicationofoverallrelativetimingbyfrequency,phase
shiftduetofilteringandsystempolarity.Thephaseplotiscircularthrough360o
thetopoftheplot(180o)isthesameplaceasthebottomoftheplot(180o).The
phasetracebelowshowsacontinuoustracethatleavesthebottomoftheplotandcontinuesonfromthetop.
Figure26:TransferFunctionPhaseTrace
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Theusercanclickanddragaphasetraceverticallytochangethepositionofthe0o
point.Regardlessofthepositionof0o,thephasetracealwaysdisplaysarangeof
360oinitsstandard,wrappeddisplayformat.
Coherence
TheCoherencetracedisplaysthestabilityoftheTransferFunctiondataoverthe
givenseriesofmeasurements/averages,andisexpressedasapercentagefrom0
(badcoh.inconsistentdata)to100%(highlyconsistentdata.)IftheTransfer
Functionsaveragerissettoinstantaneous,Coherenceisnotcalculated.
TheCoherencetraceisplottedusingtheupperoftheMagnitudewindow.
Therearethreegeneralcausesofreducedcoherence.First,aproblemwiththe
measurementsystemmostcommonly,nothavingthemeasurementdelayset
properly(seebelow).Second,environmentalnoisecausingmeasurement
contaminationlossofsignaltonoise.Andthird,excessreverberance/dropofDirecttoReverbratiointhemeasurementsystem.Onanongoingbasis,the
Coherencetraceprovidesanexcellentindicationofsystemintelligibility,andisa
goodsourceoffeedbackonsystem/measurementquality.
Figure27:TransferFunction-CoherenceTrace
SmaartutilizesablankingfunctionthatwillhideTransferFunctiondatafromthe
plotatfrequencieswhereCoherenceisbelowasetblankingthreshold.Theusercan
setthisinTransferFunctionoptions,orusetheadjustmenthandleonthe
magnitudeplot(nexttothecoherencescaleintheupperright).
TransferFunctionControls
LikeSpectrum,allTransferfunctionmeasurementsbydefaultuse
thesameGlobalTFSettingsforFFT,Averaging,Smoothing,etc,
unlesstheyaresettoignorethosesettingsinthemeasurements
individualtabintheGroupManager.
Figure28:TransferFunctionControls
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Averaging:
Averagingameasurementstabilizesthemeasurementandhelpsrejectuncorrelatednoise.TheSmaartv7usesastandardFIFO(FirstIn,FirstOut)forthelowerlevelsofaveraging(2,4,8,16)andthenswitchestoaccumulatorsabovethat(1sec,2sec,
etc).Theseaccumulatorsprovidesignificantimprovementsinstabilityoverpast
largerFIFOsandarepreferredforacousticmeasurements.
Smoothing
Smaartv7includesnewFractionalOctavesmoothingalgorithmsforreducingthe
rippleinTFtracesandaidinginviewingthegeneraltrendsofthedatacurves.
LiveIR
TheTransferFunctioncanbeviewedasaLiveIR.ThisdisplayshowstheImpulseResponseinalinearscale,timedomain
viewwiththeTFmeasurementdelay
timelocatedatthecenterofthescreen.
LiveIRsettingscanbeadjustedinthe
TransferFunctionOptionsdialog.
Figure29:Smoothing
Figure30:LiveIRSettings
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Figure31:LiveIRWindow
DelayLocator/DelayTracking
TransferFunctioniscalculatedbycomparingthesignaloninputtoasystemtoits
correspondingoutputsignal.Mosttimes,thereissomedelaythroughthesystem,
oftentheresultoflatencyintheprocessing,signaldelayandacousticpropagation
time.Eachtransferfunctionobjecthasameasurement
delaythatcanbeusedtodelaytheinput/reference
signaltoitsoutput/measurementsignal.Accordingly,
SmaarthasabuiltinDelayLocatorfunctionthat
performsanimpulseresponsemeasurement,andreturnsthetimeassociatedwiththetallestpeak
normallythedelaytimeassociatedwiththearrivalofthe
directsound.Foreachmeasurementobject,thisfunctioncanbecalledwiththe
Findbuttoninitsindividualmeasurementcontrol.
Alternatively,theusercanchoosetohaveanindividualmeasurementobject
continuouslytrackthemeasurementdelay(usingthesamebasicfunctionasLive
IR)bypressingtheTrackbuttonorindicatorlightlocatedinthemeasurements
individualcontrol.
Note:TheTrackfunctiondoesconsumesomeprocessorresources,soifyourmeasurementdelayisnotchanging(themicorspeakerisnot
activelymoving,)itisprobablybesttoturntrackoffoncethe
measurementdelayhasbeenacquired.
ApplicationExample:SettinganEqualizerforaLoudspeaker
Inthisexample,anengineermeasurestheTransferFunctionofaloudspeaker,and
thenadjustsanequalizertoflattenitsoverallresponse.Here,theuserhasamulti
channelI/O,someasurementsoftheEqualizer(MixOutcomparedtoEQOut)and
completeloudspeakersystem(MixOutcomparedtoMicrophone)canbeperformed
simultaneously.Thisexamplecouldalsobeaccomplishedperformingthosemeasurementsindividually/sequentially.Thisexampleusesthefollowing
hardware
Figure32:TFControlObject
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configuration.
Figure33:TransferFunction-SampleConfiguration
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Thisconfigurationproducesthefollowinginitialmeasurements.
Figure34:InitialTransferFunctionMeasurement-LoudspeakerandEQ
Nextwecapturetheloudspeakerresponsetrace,adjusttheEQandviewtheresults
intheactiveMicOnemeasurementofthetotalsystem.NotethattheEQ
measurementhasbeensettographinverted,sowecanlaytheEQdirectlyoverthestoredresponsetrace.Thishelpswithrefiningfilterwidthandfrequency.
Figure35:TransferFunctionMeasurement-InitialSpeakerResponse(Stored),EQTrace(inverted)and
EqualizedSpeaker
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DataManagementDatatracesinv7arehandledverymuchlikewithSmaartLivev5.
Datatracesarecapturedtothedataslot(register)whereausercaneasilyhide/showdata.TheleftsideoftheRealTimeGUIis
dedicatedtotheDataStorageStrip.Thereareseparatestripsfor
Spectrum(RTA)dataandTransferFunctiondata,withtheStorage
Stripthatcorrespondstotheactivedatawindowtypedisplayed
(sameaswiththecontrolstrip.)
TracescapturedtotheDataStripresideinRAM.Usercanchooseto
writeanytracepermanentlytofilebyselectingthedesiredslotand
clickingtheSavebutton.Theuserwillbepromptedtochoosethe
destinationfolderforthedatafile.Smaartv7dataisnowsavedin
separateformatsforSpectrum(.srf)andTransferFunction(.trf)data.Thisisdoneasaconveniencesothatuserscanquickly
determinethesaveddatatype.(Old.reffilesdidnotdesignatewhich
typeofdataintheirfileextension.)
UserscanloadsavedSmaart.ref,.srfor.trfdatacreatedfromany
versionofSmaart(pastorpresent)byselectingthedesireddata
slot,clickingLoad,andthenselectingthefilefromitsstoredlocation.Smaartcannotreaddatastoredas.rgp(referencegroup
files).
Tocaptureatrace,selectthedataslotandclicktheCapturebuttonorusethe
[spacebar]hotkey.Alternatively,theusercanchoosetoCaptureandSavedata
simultaneouslybyusingthe[command]+[F]hotkeycommand.
Placingthemousecursoroveradataslotwillshow
adatatooltipwithinformationaboutthe
captureddatainthatslot.
Toaveragestoreddatatraces,holddownthe
[command]key,highlight(clickon)theslotsyou
wishaverage,andclicktheAveragebutton.This
willplacetheaveragedtraceinthenextopenregister.
Note:Thetraceaveragingfunctioncanonlyaveragetracesstored
withthesameFFTmeasurementsettings.
Figure36:Data
StorageStrip
Figure37:Data"ToolTip"
Information
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ImpulseResponseMeasurementsImpulseResponsemodeisdesignedtoprovidearobustandintuitivesetoftoolsfor
measuringandexaminingtheacousticalresponseofsystemsandenvironments.
Smaartv7sImpulseResponsemodehasbeensignificantlyexpandedfrompast
versions(andwillcontinuetoexpand)toincludemuchofthefunctionalityfromtheSmaartAcousticToolssoftwarepackage.
Inthismode,wecanalsoanalyzepreviousIRmeasurements(orothertimedomain
information)thathavebeenstoredinstandard.wavor.aiff(MAC)audiofileformat
ImpulseResponseControls
InIRMode,ausercanperformanImpulseResponsemeasurementbychoosinganyResponseMeasurementtheycurrentlyhaveconfigured,settingthemeasurement
parameters(primarilyFFTsize/TC),acquiringsignalsandpressingstart.Alternatively,theusercanchoosetoloadastoredfileviatheFilemenu.
Oncetheuserhascapturedorloadedanimpulseresponsemeasurement,theycanusetheviewingtoolsbelowtoanalyzeit.
AtthetopoftheIRmodeGUIisawindowdisplayingtheentireimpulseresponsein
linearview.ThisNavwindowisusedforselectingthetimedomainzoomforthe
lowerdatawindows.AsinRealTimemode,rightClickanddragtochooseyour
zoomwindow,andclickonthedataaxistoclearthezoom.
Note:Whenmeasuringanimpulseresponse,itisveryimportantthatyouhaveastrongreferencesignal(givethemeasurementagood
viewofthesignalyouarelookingfor),andmakesureyourTCisset
toatleastfivetimes(5x)thelengthofthetotalsystemresponse
(includingreverberantdecay)youaremeasuring.
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Log/Lin/ETC
Views
FrequencyDomain
View
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IRModeSpectrograph
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Appendices
HotKeys(AcceleratorKeys)
Acomplete,uptodatelistingofSmaartsHotKeysiscontainedintheSoftwares
helpfiles.
Measurement Controls
[O] Selected Measurement On/Off
[Cmd/Ctrl] + [O] All On (run all live measurements of selected type)
[Cmd/Ctrl] + [Alt] +[O] All Off (stop all llive measurements of selected type)
[V] Reseed Averages
Delay Controls
[D] Track Delay (toggles Delay Tracking for selected Transfer Function measurement
[Cmd/Ctrl] +[D] All Track (turn on Delay Tracking for all active Transfer Function measurements)[L] Find Delay (for selected Transfer Function measurement)
[Cmd/Ctrl] + [L] Find All Delays (find delays for all active Transfer Function measurements)
[,] Decrement Delay (for selected Transfer Function measurement)
Data Storage and File Operations
[Space] Capture Trace (captures the front trace on the selected graph into the selected sto
[Cmd/Ctrl] + [F] Capture and File Trace (creates a permanent file on disk while capturing)
[Cmd/Ctrl] +[S] Save to File (.wav or .srf/trf depending on the operating mode)
[Del] Clear Selected Storage Slot
Display Controls
[I] IR Analysis Mode
[R] Real-Time Mode
[S] Spectrum
[T] Transfer Function
[Cmd/Ctrl] + [I] Live IR (Show/Hide)
[Y] Clear Y Offset (Selected)
[Cmd/Ctrl] + [Y] Clear Y Offset (All)
[Z] Cycle Z Order (Forward)
[Shift] + [Z] Cycle Z Order (Back)
[+] Zoom In Y
[] Zoom Out Y
[Cmd/Ctrl] +[+] Zoom In X/Y
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[Cmd/Ctrl] +[] Zoom Out X/Y
[Cmd/Ctrl] + [Alt] +[+] Zoom In X
[Cmd/Ctrl] + [Alt] +[] Zoom Out X
[Up Arrow] Scroll Up*[Down Arrow] Scroll Down*
[Left Arrow] Pan Left
[Right Arrow] Pan Right
*Or roll "roll" the (wrapped) Phase display.
[Cmd/Ctrl] means press the [Ctrl] key on a Windows computer or the [Cmd] key (sometimescalled the Apple Key or "flower" key) on a Macintosh computer. The Alt key on a Windows systemmaps to the Option key on
SelfHelp:WheretogoforAnswers
Ultimately,theuser,asengineerandoperator,isresponsibleforansweringtheir
ownspecificapplicationquestions.Inordertoassistinthisprocess,Rational
Acousticssuggeststhefollowingsources:
1. UsetheHELPFILESinthesoftwarealotofveryhelpfulinformationaboutSmaartsfunctionsandfeaturesisthere,anditisfullysearchable.
2. TheSmaartuserforumsatRationalAcoustics.com
3. SmaartTrainingsessions4. PreviouslypublishedSmaartandSmaartLiveManualsandTechnical
NotesthesecanbefoundontheRationalAcousticswebsiteat:
http://www.rationalacoustics.com/pages/New_Documentarium5. TheRecommendedReadingsourcescitedinthelastsectionofthisdocument.
6. OrevencontactRationalAcousticsdirectlyviaemail(preferred)orphone.
TrainingsessioninformationandcontactinformationforRationalAcousticsand
authorizedrepresentativescanbefoundathttp://rationalacoustics.com.
RecommendedReadingD.Davis,C.Davis:SoundSystemEngineering ,2ndedition.Carmel,IN:SAMS.1994.
M. Mehta, J. Johnson, C. Rocafort:Architectural Acoustics: Principles and Design.
UpperSaddleRiver,NJ:PrenticeHall.1999.
American National Standard: Specification for Sound Level Meters, ANSIS1.41983.
NewYork,NY:AcousticalSocietyofAmerica.1983.
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R. Cabot, B. Hofer, R. Metzler: Standard Handbook of Video and Television
Engineering: Chapter 13.3: Nonlinear Audio Distortion, 4th edition.
McGrawHillProfessional.2003.
OSHA Standard: Occupational Noise Exposure, OSHA 1910.95. Washington, DC:
OccupationalSafety&HealthAdministration.1996.
CriteriaforaRecommendedStandardOccupationalNoiseExposure,RevisedCriteria
1996,DHHS(NIOSH)PublicationNo.96.Atlanta,GA:NationalInstitutefor
OccupationalSafety&Health.1996.
Motion-Pictures - B-Chain Electroacoustic Response - Dubbing Theaters, Review
RoomsandIndoorTheaters,SMPTE202M1998.WhitePlains,NY:Societyof
MotionPictureandTelevisionEngineers.1998.
If youhave an interest in furthering yourknowledge of theengineeringconcepts behind
FFTbasedmeasurement,youmayfindthefollowingtextsuseful:
A.Oppenheim,A.Willsky,S.Nawab:SignalsandSystems,2ndedition.UpperSaddle
River,NJ:PrenticeHallInc.1997.
A.Oppenheim,R.Schafer,J.Buck:Discrete-TimeSignalProcessing ,2ndedition.Upper
SaddleRiver,NJ:PrenticeHallInc.1999.