I have a stereo microphone recording that features two sources:
- The signal is considerably more prominent in the left channel than in the right one.
- The noise is present in both channels but slightly more so in the right one. It’s a combination of different types of undesired sounds including machine sounds, human activity and traffic noise (through a wall). It drastically changes over time.
Here is an close-up of the signals of a section featuring only the noise (logarithmic amplitude scale):
Now, I want to filter out the signal as well as possible exploiting the aforementioned special properties of my recording (as opposed to standard noise reduction). I already tried to simply subtract the right channel from the left one¹. The result was surprisingly good, but I suspect that I can do even better with a more sophisticated tool.
Is there any tool dedicated to this? Or is there a combination of standard tools that I am missing?
I am currently working with Audacity; thus I prefer a solution using it when in doubt.
¹ I later found this blog post, which does something similar plus regular noise reduction.