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DECtalk Speech Synthesizer (1984)
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== Future research == For DECtalk, which had just come out at that time, there were still many problems. First of all, although many advanced speech technologies were utilized by it, the sounds it generated at the time were still far from human speech.<ref name=":0" /> Secondly, its eight built-in voices cannot completely imitate the speaker's native pronunciation, nor can they express the speaker's emotions. The pitch variations of the speech it generates are not diverse. Additionally at the time, DECtalk lacked American English pronunciation, although this was implemented in the early 2000s. At present, DECtalk is gradually being replaced by other more advanced speech synthesis applications with deep learning AI as the main technology.<ref>Ning Y, He S, Wu Z, et al. A review of deep learning based speech synthesis[J]. Applied Sciences, 2019, 9(19): 4050.</ref> I think that although DECtalk plays a very important role in the history of speech synthesis, at present, deep learning AI trained through large-scale data can help us achieve more realistic speech and capture more details. In addition, DECtalk has been widely used in the healthcare field, and I think that in the future, this field will be the most important development direction of DECtalk. DECtalk should realize Text to speech neural systems and achieve good quality voice output through deep learning AI.<ref>Bolimera R, Kishore K T. Artificial Intelligence and IoT-based Healthcare System using TTS Assistive Technology for Voice Disordered People[J]. NeuroQuantology, 2022, 20(10): 3649-3656.</ref>
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