Block-based physical modeling is a recently introduced method for digital sound synthesis via the simulation of physical models. The method follows a "divide-and-conquer" approach, where the elements are individually modeled and discretized, while their interaction topology is separately implemented. In this paper the application of this approach to string instruments is presented. The string is modeled with the functional transformation method, preserving all varieties of strings by a direct link from the physical string parameters to the algorithm. The excitation of the string is modeled separately with wave digital filters. Thanks to the block based approach it is possible to simulate all kind of string instruments, i.e. piano, guitar, and violin, with the same piece of code for the strings.
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