Multiwarping for enhancing the frequency accuracy of digital waveguide mesh simulations

Author

Savioja, Lauri ; Valimaki, Vesa

Author_Institution

Telecommun. Software & Multimedia Lab., Helsinki Univ. of Technol., Espoo, Finland

Volume

8

Issue

5

fYear

2001

fDate

5/1/2001 12:00:00 AM

Firstpage

134

Lastpage

136

Abstract

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.

Keywords

FIR filters; acoustic signal processing; acoustic waveguides; all-pass filters; digital simulation; filtering theory; signal sampling; FIR filter; acoustic delay lines; acoustic signal processing; digital waveguide mesh simulations; finite-length digital impulse response processing; first-order allpass filters; frequency accuracy; frequency warping; maximal frequency error; multiwarping; nonlinear frequency shift; sample rate conversions; Acoustic propagation; Acoustic signal processing; Acoustic waveguides; Delay lines; Digital filters; Finite impulse response filter; Frequency conversion; Laboratories; Signal processing; Transfer functions;

fLanguage

English

Journal_Title

Signal Processing Letters, IEEE

Publisher

ieee

ISSN

1070-9908

Type

jour

DOI

10.1109/97.917694

Filename

917694