Quasi-Bandlimited waveforms may be synthesized by smoothing the discontinuities of trivial waveforms using the Bandlimited Step Method (BLEP) that produces excellent results with low computational overhead [1]. The correction scheme first starts with a sinc function—the impulse response of a low-pass filter—and uses it to generate offset values that are applied to the points around the discontinuity. Windowing the sinc function prior to use is found to reduce aliasing at the expense of the harmonic envelope, whose shape is no longer ideal. In this paper we explore two methods for generating the initial sinc function in an effort to achieve a perceptually alias-free waveform. Both approaches involve using the Genetic Algorithm as a search method.

Authors: Valencia, Francisco; Behura, Samarth; Pirkle, Will
Affiliations: codigoriginal, Medellin, Colombia; University of Miami, Coral Gables, FL, USA(See document for exact affiliation information.)
AES Convention: 141 (September 2016) Paper Number: 9667
Publication Date: September 20, 2016
Subject: Signal Processing

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