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Convention Paper

Kautz filters and generalized frequency resolution - Theory and audio applications

Authors: Karjalainen, Matti; Paatero, Tuomas

AES Convention 110 · Paper 5378 · May 2001

Abstract

Frequency-warped filters have recently been applied successfully to a number of audio applications. The idea of allpass delay elements replacing unit delays in digital filters allows for focusing of enhanced frequency resolution on lowest (or highest) frequencies and enable good match to the psychoacoustic Bark scale. Kautz filters can be seen as a further generalization where each transversal element may be different, including complex conjugate poles. This enables arbitrary allocation of frequency resolution for filter design, such as modeling and equalization (inverse modeling) of linear systems. In this paper we formulate strategies for using Kautz filters in audio applications. Case studies of loudspeaker equalization, room response modeling, and guitar body modeling for sound synthesis are presented.

Details

Published in
AES Convention 110
AES Convention
110
Paper number
5378
Publication date
May 6, 2001
Session subject
Signal Processing for Audio
Affiliation
Helsinki University of Technology, Laboratory of Acoustics and Audio Signal Processing, Espoo, Finland (See document for exact affiliation information.)
Type
Convention Paper