Good question, there&#x27;s an interesting link to a wiki page in their matlab function docstring<p><a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Phase_stretch_transform" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Phase_stretch_transform</a>