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Tinnitus isn’t sound in the “vibrating molecules of air” sense—it’s a neurological phenomenon. Anything’s possible—but our perception of sound is not obligated to play by the same rules as physical sound does, and ANC relies on those rules.

I have tinnitus which is within the frequency range I can hear, what I've found using headphones and a web tone generator is that I can establish a 'beat' frequency but I can't cancel it out entirely. That leads me to suspect that the frequency and phase of the tinnitus isn't consistent enough to cancel without actively tracking it, and how do you do that?

The ringing is from the nerves and not an actual acoustical wave, isn't it?

Unlikely, because tinnitus is (from what I understand) a malfunction of the auditory part of the brain. There is nothing physical to cancel out.

Also, mine for example, is not completely static.

My tinnitus, that my second covid infection gave me, is outside my current hearing frequency range.