Digital sound synthesis based on physical models is realized in real-time applications mostly with the well known digital waveguide method (DWG). It approximates the underlying physical behavior of a vibrating structure in a computationally efficient way. Due to these computational efficient approximations, the waveguide method looses the direct connection to the parameters of the underlying physical model. The recently introduced functional transformation method (FTM) on the other hand solves the underlying physical model analytically. Thus, the physical parameters are explicitly given in the discrete realization of the FTM. But due to this 'physicality' the computational cost of synthesis using FTM is larger than using DWG. This paper compares the DWG with the FTM and shows that for linear vibrating strings it is always possible to design an acoustically indistinguishable DWG approximation with the parameters obtained from the FTM. In that way, a computationally efficient and physically meaningful synthesis method is obtained. Furthermore, this paper shows the limits of this new synthesis method.

Authors: Trautmann, Lutz; Bank, Balazs; Valimaki, Vesa; Rabenstein, Rudolf
Affiliations: University of Erlangen-Nuremberg, Telecommunications Laboratory, Erlangen, Germany ; Budapest University of Technology and Economics, Dept. of Measurement and Information Systems, Budapest, Hungary ; Helsinki University of Technology, Laboratory of Acoustics and Audio Signal Processing, Espoo, Finland ; Tampere University of Technology, Pori School of Technology and Economics, Pori, Finland(See document for exact affiliation information.)
AES Conference: 22nd International Conference: Virtual, Synthetic, and Entertainment Audio (June 2002)
Paper Number: 000215
Publication Date: June 1, 2002
Subject: Virtual, Synthetic and Entertainment Audio

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