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Analysis of root displacement interpolation method for tunable allpass fractional-delay filters

Hacihabiboglu, H, Guenel, B and Kondoz, AM (2007) Analysis of root displacement interpolation method for tunable allpass fractional-delay filters IEEE TRANSACTIONS ON SIGNAL PROCESSING, 55 (10). 4896 - 4906. ISSN 1053-587X


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One of the simplest ways of designing allpass fractional-delay filters with maximally fiat group delays is by using the Thiran approximation by which the filter coefficients are calculated using a closed-form equation. However, due to the number of multiplications and divisions involved, the calculation of these coefficients is a computationally costly task and is not suitable for real-time applications. The analysis of a root-displacement-based interpolation method used in allpass tunable fractional delays is presented in this paper. The method allows continuous adjustments of the approximated fractional delay without the explicit calculation of a new set of filter coefficients. The transient error observed at the output due to the change of filter coefficients is analyzed. The direct and cascade implementations are compared with respect to their transient errors. An example application of the proposed method from the field of model-based sound synthesis is given.

Item Type: Article
Uncontrolled Keywords: Science & Technology, Technology, Engineering, Electrical & Electronic, Engineering, allpass systems, audio signal processing, filter interpolation, fractional delay filters, transients, tunable filters, DIGITAL-FILTERS, DESIGN
Related URLs:
Divisions: Faculty of Engineering and Physical Sciences > Electronic Engineering > Centre for Communication Systems Research
Depositing User: Mr Adam Field
Date Deposited: 27 May 2010 14:44
Last Modified: 23 Sep 2013 18:35

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