This specification describes how a system implemented as computer programs on one or more computers in one or more locations can generate a sequence of audio data that includes a respective audio sample at each of multiple time steps . For example , the sequence of audio data can represent speech in a particular natural language or a piece of music.

https://patentimages.storage.googleapis.com/1b/d3/ac/60abc0081cdf1b/US20190251987A1.pdf

It seems that this patent covers Wavenet. It has the iconic diagram demonstrating dilated convolutions and the equations for the layers.