voice improvement

https://www.youtube.com/watch?v=zstghz0fWsg

https://www.analyticsvidhya.com/blog/2018/01/10-audio-processing-projects-applications/

http://www.utdallas.edu/~mirsamadi/files/mirsamadi_se_is16.pdf

https://github.com/eesungkim/Speech_Enhancement_DNN_NMF

Speach Enhancement GAN (Generative Adversarial Network)

https://arxiv.org/abs/1703.09452