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 BerkeleyAimAimTo provide an environment for evaluating the sound qualities of modeled simple idiophonesImages courtesy of Steve ReinmuthAimAimTo recreate the object’s sound in an interactive environmentTo be able to use these sounds to extend synthesis for computer musicModeled Objects Mode ActivationPrevious Sound Generation ResearchPrevious Sound Generation ResearchStochasticSerra, X. et al. 1990Cook, P. 2001Texturesvan den Doel, K. et al. 2001Di Fillipo, D. et al. 2000AnalyticSmith, J. 1992Cook, P. 1995ModalMorrison, J. et al. 1993O’Brien, J. et al. 2001Methods for sound synthesis for graphicsGeometric ModelsGeometric ModelsSimple or complex shapesMultiple resolutions are generatedCan use thin or solid modelsPhysical ModelPhysical ModelModal FormulationModal FormulationMode Shapes (exaggerated)Mode Shapes (exaggerated)Modal ActivationModal ActivationLoad 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 GenerationSoftware created as an Audio Unit plug-inCan be used in AU host applicationsThis allows for sound generation in a composing environmentStrike LocationSound ValidationSound ValidationSynthesized sounds were compared with actual object sound generationSquare plateAluminumSteelRectangular plateAluminumOdd shaped platesAluminumModel RealMeasurement SetupMeasurement SetupSound dampened room Selection after transientsFFT 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 DiscussionSystem for generating “ringing” sounds More “natural” => more interestingReal-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 strikeInclude coupling with environment (air).AcknowledgementsAcknowledgementsApple ComputerRuzena BasjcyDavid BindelJon DrukmanJustin MaxwellJames McCartneyKim SilvermanBill
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