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Virtual Instrument Design and Animation

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PowerPoint PresentationAimSlide 3Previous Sound Generation ResearchGeometric ModelsPhysical ModelModal FormulationMode Shapes (exaggerated)Modal ActivationInteractive Sound GenerationSound ValidationMeasurement SetupSquare (Aluminum)Square (Steel)Rectangle (Aluminum)Odd Shaped Plates - “S”Odd Shaped Plates - “G”Demo PlateDemo Odd ShapeSummary and DiscussionAcknowledgementsVirtual Instrument Design and AnimationCynthia BruynsRobert TaylorCarlo SéquinUniversity of California at BerkeleyAimAimTo provide an environment for evaluating the sound qualities of modeled simple idiophonesImages courtesy of Steve ReinmuthAimAimTo recreate the object’s sound in an interactive environmentTo be able to use these sounds to extend synthesis for computer musicModeled Objects Mode ActivationPrevious Sound Generation ResearchPrevious Sound Generation ResearchStochasticSerra, X. et al. 1990Cook, P. 2001Texturesvan den Doel, K. et al. 2001Di Fillipo, D. et al. 2000AnalyticSmith, J. 1992Cook, P. 1995ModalMorrison, J. et al. 1993O’Brien, J. et al. 2001Methods for sound synthesis for graphicsGeometric ModelsGeometric ModelsSimple or complex shapesMultiple resolutions are generatedCan use thin or solid modelsPhysical ModelPhysical ModelModal FormulationModal FormulationMode Shapes (exaggerated)Mode Shapes (exaggerated)Modal ActivationModal ActivationLoad model geometry into viewer program.Choose materials parameters.Select several strike locations on the model– and map to keys of a midi keyboard.PLAY ! – Key velocity determines intensity of strike.Interactive Sound GenerationInteractive Sound GenerationSoftware created as an Audio Unit plug-inCan be used in AU host applicationsThis allows for sound generation in a composing environmentStrike LocationSound ValidationSound ValidationSynthesized sounds were compared with actual object sound generationSquare plateAluminumSteelRectangular plateAluminumOdd shaped platesAluminumModel RealMeasurement SetupMeasurement SetupSound dampened room Selection after transientsFFT analysis of identical time intervalsTime (seconds)Frequency (Hz)Amplitude (dB)AnalysisWindow?Square (Aluminum)Square (Aluminum)Frequency (Hz)Sound Pressure Level (dB/Hz)604020100 200 500 1000 2000MaterialsModelSquare (Steel)Square (Steel)Frequency (Hz)Sound Pressure Level (dB/Hz)604020100 200 500 1000 2000MaterialsModelRectangle (Aluminum)Rectangle (Aluminum)Frequency (Hz)Sound Pressure Level (dB/Hz)604020100 200 500 1000 2000MaterialsModel?Frequency (Hz)Sound Pressure Level (dB/Hz)604020100 200 500 1000 2000MaterialsModelOdd Shaped Plates - “S”Odd Shaped Plates - “S”Odd Shaped Plates - “G”Odd Shaped Plates - “G”Frequency (Hz)Sound Pressure Level (dB/Hz)604020100 200 500 1000 2000MaterialsModelDemo PlateDemo PlateDemo Odd ShapeDemo Odd ShapeSummary and DiscussionSummary and DiscussionSystem for generating “ringing” sounds More “natural” => more interestingReal-time generation of strike-sounds.System may become predictive enough to allow interactive design of new “bells”Real-time shape modifications an re-analysis ?Extensions: Non-linear phenomena during initial strikeInclude coupling with environment (air).AcknowledgementsAcknowledgementsApple ComputerRuzena BasjcyDavid BindelJon DrukmanJustin MaxwellJames McCartneyKim SilvermanBill


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