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Virtual Instrument Design and Animation Cynthia Bruyns Robert Taylor Carlo Séquin

Virtual Instrument Design and Animation Cynthia Bruyns Robert Taylor Carlo Séquin University of California at Berkeley. Aim. To provide an environment for evaluating the sound qualities of modeled simple idiophones. Images courtesy of Steve Reinmuth. Aim.

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Virtual Instrument Design and Animation Cynthia Bruyns Robert Taylor Carlo Séquin

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  1. Virtual Instrument Design and Animation Cynthia Bruyns Robert Taylor Carlo Séquin University of California at Berkeley

  2. Aim • To provide an environment for evaluating the sound qualities of modeled simple idiophones Images courtesy of Steve Reinmuth

  3. Aim • To recreate the object’s sound in an interactive environment • To be able to use these sounds to extend synthesis for computer music Modeled Objects Mode Activation

  4. Previous Sound Generation Research • Methods for sound synthesis for graphics

  5. Geometric Models • Simple or complex shapes • Multiple resolutions are generated • Can use thin or solid models

  6. Physical Model

  7. Modal Formulation

  8. Mode Shapes (exaggerated)

  9. Modal 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.

  10. Interactive 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 environment Strike Location

  11. Sound Validation • Synthesized sounds were compared with actual object sound generation • Square plate • Aluminum • Steel • Rectangular plate • Aluminum • Odd shaped plates • Aluminum Model Real

  12. Measurement Setup AnalysisWindow • Sound dampened room • Selection after transients • FFT analysis of identical time intervals Amplitude (dB) Frequency (Hz) ? Time (seconds)

  13. 604020 Sound Pressure Level (dB/Hz) Materials 100 200 500 1000 2000 Model Frequency (Hz) Square (Aluminum)

  14. 604020 Sound Pressure Level (dB/Hz) Materials 100 200 500 1000 2000 Model Frequency (Hz) Square (Steel)

  15. Rectangle (Aluminum) 604020 ? Sound Pressure Level (dB/Hz) Materials 100 200 500 1000 2000 Model Frequency (Hz)

  16. 604020 Sound Pressure Level (dB/Hz) Materials 100 200 500 1000 2000 Model Frequency (Hz) Odd Shaped Plates - “S”

  17. 604020 Sound Pressure Level (dB/Hz) Materials 100 200 500 1000 2000 Model Frequency (Hz) Odd Shaped Plates - “G”

  18. Demo Plate

  19. Demo Odd Shape

  20. Summary 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).

  21. Acknowledgements • Apple Computer • Ruzena Basjcy • David Bindel • Jon Drukman • Justin Maxwell • James McCartney • Kim Silverman • Bill Stewart

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