Ideally the peaks of the natural sound and the "injected anti-sound" are opposite in their relative pressure to the environment, so that they cancel out.
Maybe some almost inaudible frequency spectra, and in a lesser degree also audible frequencies, sometimes aren't phase-matched by the injected anti-sound, so that their peaks add up, creating an unnatural loud sound, which for some reason isn't perceived as harmful.
These short out-of-sync peaks could be causing the tinnitus?
Maybe some almost inaudible frequency spectra, and in a lesser degree also audible frequencies, sometimes aren't phase-matched by the injected anti-sound, so that their peaks add up, creating an unnatural loud sound, which for some reason isn't perceived as harmful.
These short out-of-sync peaks could be causing the tinnitus?