Don't worry about isolating the sound too much. If your human ear can identify a bad bearing even if the radio is on, you can train a model to do the same. Som

Don't worry about isolating the sound too much. If your human ear can identify a bad bearing even if the radio is on, you can train a model to do the same. Some of this will come just from spectral analysis, which makes it easy to distinguish the rumble of a V8 a belt squeak. You can also probably guide a user through a couple of system changes to isolate sounds. For instance, a sound related to the alternator may change with both RPMs and electrical load. A sound related to the serpentine belt might be affected by engaging/disengaging a mechanical load like the A/C. A wheel bearing or brake noise will track with the rolling speed, not the RPMs, and may be affected by steering (a hard turn to the right may unload the left side of the vehicle.) I'm blown away by how much diagnostic info a good repair tech can get just from listening to a car; I would pay to have this kind of guidance in a phone app.