Does this exist: software for noise cancellation

There are basically two methods for noise suppression Noise suppression using Wiener-filters or other estimation-and-subtraction schemes. In order to make these sound good, a lot of optimization and brainpower is needed, though. For your application, this is probably not a good solution, since PCs are not built for real-time audio processing, and the algorithms involved are far from trivial. Playback of latency-corrected, phase-inverted background noise together with the usable signal. This wor…