Update README.md

README.md

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 ## Model description
 
-**Matcha-TTS** is an encoder-decoder architecture designed for fast acoustic modelling in TTS. The encoder predicts phoneme durations and its mean feature vectors. 
+**Matcha-TTS** is an encoder-decoder architecture designed for fast acoustic modelling in TTS. The encoder predicts phoneme durations and its average acoustic features. 
 And the decoder is essentially a U-Net inspired by [Grad-TTS](https://arxiv.org/pdf/2105.06337.pdf), that is based on Transformers architecture but combined 
 with 1D instead of 2D CNNs, making a high reduction on memory consumption and speedy synthesis.