http://wccftech.com/google-assistant-deepmind-ai/

Google recently rolled out Male and Female voice options for Google Assistant in English. A worthy alternative for those who have voice preferences for virtual assistants. The new voices for the assistant sound more real, thanks to the deep neural network for sound synthesis by Alphabet’s DeepMind division.

In 2016, Alphabet lab introduced the WaveNet deep neural network for “generating raw audio waveforms that is capable of producing better and more realistic-sounding speech than existing techniques.”