Google has pioneered a brand new text-to-speech system that it calls Tacotron 2 and it works with stunning accuracy, delivering voice narrations that are indistinguishable from the voice of a real human. This is not an exaggeration: Tacotron 2 is the second generation of the technology and it consists of two deep neural networks, one that converts the text into a special spectogram (like the one you see in the picture above), and the second one, the WaveNet, that reads this chart and interprets it into a real voice.
