Designing TheStringPhone
Authors
Andersen, Jesper Skovgaard ; Teglbjærg, David Joakim Stubbe
Term
4. term
Education
Publication year
2015
Pages
91
Abstract
This thesis presents the development of TheStringPhone, a polyphonic, physical-modeling digital musical instrument that uses the human voice as excitation. The aim is to explore how to design and implement a sound engine for a voice-driven DMI from the acoustics and synthesis perspective. The work includes a review of DMIs and voice-based systems, design decisions for the sound engine and input, and a from-scratch C++ implementation of core DSP components: a biquad filter, FIFO and circular-buffer delays, a Karplus-Strong/digital waveguide string model, linear predictive coding for a formant filter, an ADSR envelope, peak and RMS compression, and an FDN reverb. The system is integrated with audio examples, and the instrument is evaluated mainly from an engineering standpoint; no user studies are reported in the excerpt. The contribution is a documented working prototype that demonstrates polyphonic voice-excited string synthesis and provides a foundation for more holistic instrument design.
Dette speciale præsenterer udviklingen af TheStringPhone, et polyfont digitalt musikinstrument baseret på fysisk modellering, der bruger den menneskelige stemme som excitation. Formålet er at undersøge, hvordan man designer og implementerer en lydmotor til et stemmestyret DMI ud fra akustik- og synteseperspektivet. Arbejdet omfatter en faglig gennemgang af DMI’er og stemmestyrede systemer, designvalg for lydmotor og input, samt en C++-implementering fra bunden af centrale DSP-komponenter: Biquad-filter, FIFO- og cirkulære forsinkelser, Karplus-Strong/digital waveguide-strengemodel, lineær prædiktiv kodning til formantfilter, ADSR-envelope, peak- og RMS-kompression samt FDN-rumklang. Systemet integreres med lydeksempler, og instrumentet vurderes primært ud fra en ingeniørmæssig synsvinkel; der rapporteres ingen brugerundersøgelser i uddraget. Bidraget er en dokumenteret, kørende prototype, der demonstrerer polyfon stemmeexciteret strengsyntese og giver et grundlag for videre, mere holistisk instrumentdesign.
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