Fig. 1.

Original voice and nonvoice sounds and examples of their acoustic equivalents (AEs). a) Spectrograms of examples of original voice and nonvoice sounds and the 5 AEs that preserve certain acoustic features of the original sounds. The top row shows an original voice sounds and its corresponding AEs, whereas the bottom row shows an example nonvoice sounds and its AEs. b) Average perceptual similarity ratings comparing each original sound to its various AEs. The similarity rating was performed on a 10-point scale ranging from not similar at all (“0”) to highly similar (“10”).