Note that the book was released 2009 and the draft is from 2007. While most of the content is still very relevant for understanding the basics and challenges in

Note that the book was released 2009 and the draft is from 2007. While most of the content is still very relevant for understanding the basics and challenges in building TTS systems, recent progress in DNN-based synthesis (including WaveNet, GANs, and end-to-end approaches like Tacotron) is obviously not covered.