RNNoise is a noise suppression library based on a recurrent neural
network.

A description of the algorithm is provided in the following paper:

J.-M. Valin, A Hybrid DSP/Deep Learning Approach to Real-Time
Full-Band Speech Enhancement, Proceedings of IEEE Multimedia Signal
Processing (MMSP) Workshop, arXiv:1709.08243, 2018.
https://arxiv.org/pdf/1709.08243.pdf