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Parametric second- and fourth-order shelving filters for audio applications

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2 Author(s)
Keiler, F. ; Dept. of Signal Process. & Commun., Helmut-Schmidt-University, Hamburg, Germany ; Zolzer, U.

In this paper, we develop a parametric recursive second-order lowpass/highpass shelving filters and fourth-order bandpass shelving filters. These filters allow a better frequency selectivity for audio equalization as compared to the well-known first-order lowpass/highpass shelving filters and second-order peak filters. In the parametric structures, the cut-off frequencies and the gain factors can be set independently. We derive the filter designs for the discrete-time implementation. Furthermore, we apply a technique for the implementation of delay-free loops which is necessary to yield the exact inverse filter to realize symmetric boost and cut of a frequency band.

Published in:

Multimedia Signal Processing, 2004 IEEE 6th Workshop on

Date of Conference:

29 Sept.-1 Oct. 2004

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