Rust Acoustic Echo Cancellation

A very simple experiment on acoustic echo cancellation (AEC) using a Normalized Least-mean-fourth (NLMF) filter as described here. Project is in very rudimentary state and will most likely not be continued, however if you would like to experiment with acoustic echo cancellation or audio processing in rust this might be a good starting point. Currently you may compile the main binary with cargo build --release (note the release flag is quite necessary to achieve low audio latencies) and try it out, although you should keep the following in mind. The purpose of AEC is to reduce the feedback of a known output into the microphone input, and subsequently send this signal somewhere else. For example, if you are in a voice call, the known output is the incoming audio of your interlocutor which you don't want to be sent back through your microphone, therefore you want the software to remove this known output from the input microphone and then send the resulting audio to your voice chat software. The critical thing here is how to do this routing of audio back into the voice communication; in Windows I have used the proprietary software Virtual Audio Cable, I am unaware of how one would perform this in Linux, but you might want to look into JACK audio or the new PipeWire. To use raec you need these three things: an audio output you want to subtract from your input (referred to as capture device), your microphone input (referred to as microphone device), and an audio device to send the filtered signal to (referred to as output device). You can check raec --help and raec --list for how to pass this information into the program.