Either that, or the quality of the noise reduction reduces. Imagine again playing a sound with throughs where the original sound had peaks and visa versa, but with a smaller magnitude than the original sound. Now the magnitude of the resulting wave will still be reduced, but not become exactly 0, so the noise cancellation will be imperfect
Sjoerdiestriker t1_j2d60ef wrote
Reply to comment by morold in Eli5 How exactly does Noise cancellation work? That too in such small airbuds by Professional-Ad3441
Either that, or the quality of the noise reduction reduces. Imagine again playing a sound with throughs where the original sound had peaks and visa versa, but with a smaller magnitude than the original sound. Now the magnitude of the resulting wave will still be reduced, but not become exactly 0, so the noise cancellation will be imperfect