Full mesh warping techniques

Stoffels S.
DAFx-2000 - Verona
This paper discusses methods for the elimination of dispersion in a digital waveguide mesh. As in previous methods, a highly isotropic waveguide mesh is chosen as a starting point, reducing the problem to compensation of frequency-dependent dispersion. For this purpose, as an alternative to Savioja and Välimäki’s technique of frequency-warping the input/output signals, we propose (1) inhomogeneous allpass-warping of delay elements, which enables use of allpass filters without introducing delay-free loops, and (2) “mass loading” the mesh in such a way that high-frequency propagation speed is increased to partially compensate dispersion due to quantization over a grid.