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Fractional Delays using Lagrange Interpolators

S. TASSART, P. DEPALLE
Groupe Analyse-Synthèse
IRCAM, Institut de Recherche et de Coordination Acoustique-Musique
1 place Igor-Stravinsky, 75004 PARIS, FRANCE
tassart@ircam.fr, phd@ircam.fr

Abstract:

We propose in this paper an original approach for the implementation of the Lagrange Interpolator Filter (LIF) based on the formal power series expansion of the exact z-transforms of the ideal fractional delay digital filter. This approach leads to a different, new, modular and robust algorithm usable for real-time delay-varying applications. The numerical stability of the algorithm is studied here. In the context of time varying filtering, different versions of the basic algorithm are presented.




TASSART Stephan
Mon Feb 10 1997