Bowed String Simulation Combining Digital Waveguides and Finite-Difference Time-Domain Frameworks

Date: 
Tue, 10/30/2012 - 5:30pm - 6:50pm
Location: 
CCRMA Classroom [Knoll 217]
Event Type: 
DSP Seminar
In light of the promising results obtained by driving a low-complexity Digital Waveguide (DW) violin model with synthetic bowing gestures, we are currently exploring the possibilities of combining DW and Finite-Difference Time-Domain (FDTD) frameworks to construct highly realistic physical models of string quartet instruments. Departing from state-of-the-art bowed string simulation paradigms, we extend previous approaches by combining a finite-width bow-string interaction model and a dynamic friction model based on simulating heat diffusion along the width of the bow. In our model, DW is used for string propagation, while FDTD is used for bow-string interaction and heat diffusion. The bridge termination is realized using an efficient, passive digital filter obtained from admittance measurements. In this talk, we will present and discuss the current status and future directions of our modeling work, including two-dimensional string vibration simulation for horizontal and vertical polarizations.


Esteban Maestre was born in 1979. He received the B.Sc. and M.Sc. degrees in electrical engineering from Universitat Politecnica de Catalunya, Barcelona, Catalonia (Spain), in 2001 and 2003 respectively, and the Ph.D. degree in computer science and digital communication from Universitat Pompeu Fabra, Barcelona, Catalonia in 2009. From 2001 to 2006, he was a Lecturer at Universitat Politecnica de Catalunya. During 2003 and 2004, he carried out research at Philips Research Laboratories, Aachen, Germany. From 2004 to 2010, he was a researcher (Music Technology Group) and a lecturer (Department of Information and Communication Technologies) at Universitat Pompeu Fabra. In 2008, he was a visiting researcher at the Center for Computer Research in Music and Acoustics, Stanford University, where he is now a postdoctoral fellow working on gesture synthesis for automatic control of bowed string physical models. Concurrently, he is also with the Music Technology Group (Universitat Pompeu Fabra, Barcelona) where he directs research on ensemble performance analysis and supervises Ph.D. students funded by large-scale EU Comission research projects. His research interests include sound analysis/synthesis, gesture control of virtual musical instruments, performance modeling, and auditory-motor interaction.
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