I think it's like: at which point it's a sharp A or a flat A#? Because when we talk about perfect pitch, is in a musical context, in the sense that a person can

I think it's like: at which point it's a sharp A or a flat A#? Because when we talk about perfect pitch, is in a musical context, in the sense that a person can tell the note that would classify that wave, even without knowing how many Hz it is