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Overlap-Save and Overlap-Add Filters: Optimal Design and Comparison

Ali Daher 1 El Houssaïn Baghious 2 Gilles Burel 2 Emanuel Radoi 2 
Lab-STICC - Laboratoire des sciences et techniques de l'information, de la communication et de la connaissance, UBO - Université de Brest
Abstract : Overlap-save (OLS) and overlap-add (OLA) are two techniques widely used in digital filtering. In traditional OLS and OLA implementations, the system is compelled to be time-invariant and conventional filter synthesis techniques are used for designing the block filter. In this paper, based on the OLS and the OLA structures, we develop a fast algorithm for designing the optimal OLS and OLA block filters using a quadratic criterion. Comparing OLA to OLS optimal design, we demonstrate that, as in classical design approaches, they show no difference when the filters are time-invariant. However, when aliasing is not zero, although the global aliasing is the same, its components with respect to frequency are different. This conclusion is supported by simulation results, and a comparison between the optimal approach and some other standard approaches is also provided.
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Submitted on : Saturday, May 22, 2010 - 7:42:11 PM
Last modification on : Monday, March 14, 2022 - 11:08:11 AM



Ali Daher, El Houssaïn Baghious, Gilles Burel, Emanuel Radoi. Overlap-Save and Overlap-Add Filters: Optimal Design and Comparison. IEEE Transactions on Signal Processing, 2010, 58 (6), pp.3066 - 3075. ⟨10.1109/TSP.2010.2044260⟩. ⟨hal-00485906⟩



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