A widely used method for designing minimum phase filters is based on the real cepstrum (Oppenheim, 1975). An alternative method is proposed for symmetric FIR filters that flips the filter’s “left side” around the central coefficient to the “right side” using a sinus ramp of perceptually irrelevant duration. The resulting phase is nearly minimal and nearly linear. The method is applied to impulse responses. Perception tests use original sound samples (A), samples processed by real-cepstrum-based minimum phase filters (B), and samples processed by the proposed method (C). The tests reveal that for impulsive sound samples the perceived dissimilarity between A and C is smaller than the dissimilarity between A and B suggesting that the alternative method has some potential for sound processing.

Authors: Mores, Robert; Hendrych, Ralf
Affiliation: University of Applied Sciences Hamburg, Hamburg, Germany
AES Convention: 140 (May 2016) Paper Number: 9554
Publication Date: May 26, 2016
Subject: Perception

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