Perceptibility Ablation

In this section, we demonstrate the necessity of our psychoacoustic perceptibility constraint by comparing samples with similar attack success (all produce STOI degradation by the model of approximately -1.1; not including an offset produces higher degradation of -1.4, but is much more perceptible; see paper for details). While different attacks produce perceptually different outcomes in the model, our emphasis here is on the perceptibility of the attack: we believe that different constraints from ours produce more perceptible perturbations.