Multiwarping for enhancing the frequency accuracy of digital waveguide mesh simulations

A multiwarping technique is introduced. The method is based on cascading frequency warping procedures and sample rate conversions. As a practical example, we show that with this new approach, the maximal frequency error of digital waveguide mesh simulations can be reduced by about 50%. This technique gives more degrees of freedom to attain a desired amount of nonlinear frequency shift still applying first-order allpass filters for processing finite-length digital impulse responses.