Design and Evaluation of a Multi-touch Mobile Instrument, Implementing Polygonal Waveform Synthesis
Author
Csapo, Gergely
Term
4. Term
Education
Publication year
2018
Submitted on
2018-08-31
Abstract
Mobile devices offer significant potential for expressive musical interaction, yet many apps mimic existing instruments and follow the WIMP paradigm rather than exploiting touchscreens. This thesis investigates how multi-touch gestures and a symbolic, graphics-driven user interface can support expressive, multi-parameter control in mobile digital musical instruments. It synthesizes relevant research in graphical sound, DMI design, and multi-touch interaction to outline a design space, and then develops a tablet application implementing polygonal waveform synthesis combined with modern anti-aliasing. The system explores parameter mappings, gesture sets, and visual feedback grounded in the algorithm’s geometric representation. The prototype is evaluated with attention to usability, gesture preferences, and GUI/visual feedback, and the evaluation highlights important considerations for gesture design for multi-parameter control while pointing to future development. The work contributes a practical instrument and a set of design considerations for mobile, multi-touch DMIs, initiating an iterative design process.
Mobile enheder rummer stort potentiale for udtryksfuld musikalsk interaktion, men mange apps efterligner kendte instrumenter og følger WIMP-paradigmet i stedet for at udnytte berøringsskærmens muligheder. Denne afhandling undersøger, hvordan multi-touch-gestik og en symbolsk, grafikdrevet brugerflade kan understøtte udtryksfuld, flerparametrisk kontrol i mobile digitale musikinstrumenter. Arbejdet samler central forskning i grafisk lyd, DMI-design og multi-touch-interaktion for at skitsere et designrum og udvikler derefter en tabletapplikation, der implementerer polygonal bølgeformsyntese kombineret med moderne anti-aliasing. Systemet udforsker parameter-mapping, gestusdesign og visuel feedback forankret i algoritmens geometriske repræsentation. Prototypen evalueres med fokus på brugbarhed, gestuspræferencer og GUI/visuel feedback, og evalueringen fremhæver vigtige hensyn for gestusdesign til flerparametrisk kontrol samt peger på fremtidige udviklingstrin. Afhandlingen bidrager med et konkret instrument og et sæt designovervejelser til mobile, multi-touch-baserede DMIs og igangsætter en iterativ designproces.
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