Prior to DL text-to-speech used hidden markov models. Those were replaced with LSTMs relatively early in the DL-revolution (random 2014 paper). In 2015 there were likely still many HHM-based models around, but apparently at least Google already used DL-based text-to-speech.
Prior to DL text-to-speech used hidden markov models. Those were replaced with LSTMs relatively early in the DL-revolution (random 2014 paper). In 2015 there were likely still many HHM-based models around, but apparently at least Google already used DL-based text-to-speech.