A Formal Evaluation Framework for sound Morphing

Sound morphing figures prominently as one of the most interesting sound transformation techniques due to its enormous creative potential. Most authors pose the problem of morphing sounds using perceptual requirements, but hardly ever evaluate their results mainly because perceptual evaluations are cumbersome and costly, and there are no standard objective evaluation criteria established for sound morphing. In this work we propose a formal evaluation procedure for sound morphing algorithms following three criteria, namely correspondence, intermediateness, and smoothness. The adoption of the proposed evaluation framework will help formalize the results towards more perceptually relevant morphed sounds.