RNNoise is a noise suppression library based on a recurrent neural network
 - ref: https://github.com/xiph/rnnoise

To compile, just use CMake.

While it is meant to be used as a library, a simple command-line tool is
provided as an example. It operates on wav mono files. It can be used as:

./src/rnnoise_demo input.wav

the output filename is "input_out.wav"