It maps from strings of letters to mel spectrographs.

University of Michigan - Ann Arbor

The first component is an encoder-decoder model for spectrogram prediction: it maps from strings of letters to mel spectrographs: sequences of mel spectral values over time. The second component maps from mel spectrograms to waveforms.

Components of TTS

An on-going but a helpful book resource about NLP
https://web.stanford.edu/~jurafsky/slp3/

Speech and Language Processing (3rd ed. draft) 

Vocoding

It maps from mel spectrograms to waveforms.

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