1. Song, Z.: English speech recognition based on deep learning with multiple features. Computing 102(99), 1–20 (2020)
2. Wang, J.: Speech recognition of oral english teaching based on deep belief network. Int. J. Emerg. Technol. Learn. (iJET) 15(10), 100 (2020)
3. Mustaqeem, K.S.: Speech emotion recognition based on deep networks: a review. In: Korean Information Processing Society (KIPS-2021) (2021)
4. Yang, Y., Yue, Y.: English speech sound improvement system based on deep learning from signal processing to semantic recognition. Int. J. Speech Technol. 2020, 1–11 (2020)
5. Wang, Y., Wei, Z.: Research on speech enhancement based on deep neural network. J. Phys: Conf. Ser. 1650, 032163 (2020)