Yeah, I read about it and somehow it sounds logical. But not completely.
First off, the noise is not some filtering problem but a generating one?
And the signal might be trashy from our ears, I'd disagree as well, since our brain doesn't know if it's a tone generated outside your head or a tone generated by haircell damage?
If it is the brain searching for a signal where there is none, the same problem arises, since it's in a different cortex? Or does the brain boosts the nerve sensitivity somehow?
Well, watch this:
Everything in our body is controlled by Nervous System which consists of main processing unit as a whole - brain. From brain we get "branches" of wires (nerves) and main one is spinal cord. In the Scull we have nerves that go to eyes, ears and etc. From the Scull down the neck we have brain stem -> spinal cord. Out of spinal cord we get branches of nerves that go all over our organs and control them.
Now, the way our brain controls everything is through electric signaling and chemicals that are released as a result of specific signaling command(s).
Brain as brain processing unit has own "modules" (cortex) that do control different things (audio, visual, emotions, etc).
If something alternates the "norm", your brain will respond accordingly and give you a symptom or a set of such to alert you that there is an issue. Example: lets say you have shooting pain that radiates to your leg - that is signal to you from your brain via nervous system that you have an issue. This helps doctors with diagnosis to help you solve this.
Human body is highly intelligent and is not doing anything "stupid". Due to its high complexity medical community is still struggling in understanding most if it functions, this is why we still have not solved issue with T and VS.
Now, what i was trying to say originally is that there is always a level of "toll" that our nervous system can absorb, however when it is over it - we start experiencing symptoms.
If you look around yourself, you will see that a lot of technological things do in a way mini how things work in human body. I can easily compare hearing in humans to telephone call works.
In telephone call, quality of sound is most important thing. Everything is highly depended on headset (speaker/microphone), quality of connection (traffic is able to make it to destination within correct time-frame, proper order). Now, if something in this setup is not working right - callers will experience all kinds of weird audio problems (choppy/delayed voice, static and etc).
Since our brain has "live" connection to all of our organs, it obviously does so to our cochlea too.
Cochlea as you might already know consists of whole bunch of nerves that are intelligently laid out in specific order to presieve different frequencies of sound (20hz (deep inside cochlea - bass/low freq) up to 20000hz(on outer side of cochlea(high freq). If you somehow alter their "normal" natural state (chemical/physical damage through sound - does same) you might be still in 'tolerance" window, where lets say you wont be able to hear that frequency as well, but damage is not that critical to give symptom except your perception of sound might not be same at lower db. If you reach point where there neurons (hair cells) get damage to the point where they are out of "tolerance" range for nervous system, you have a great chance of getting Tinnitus (and as you see, pretty much all people do).
Now, what is Tinnitus in my opinion ? Its that static that you get when phone line is bad. Your brain is supposed to have its "normal" signalling to cochlea and is waiting for proper feedback, however it is not since something wrong on the side of cochlea or nerve that connects it to brain.
Body has its own "regenerative" norm, this is why some people go to concert/club and get out with ringing but next day its gone (smart people actually google this shit up right away, and even when next day it is gone - they either never go to these types of events anymore, or wear hearing protection. Simply because - f*ck this club, few hours of music not going to make it up for possibly life-long Tinnitus).
I am pretty positive actually that there should be some sort of nutrition or something like that that would elevate these supporting neurons to become new "primary/main" ones to restore sensory input to the brain.
At this point what i am thinking is that brain - is indeed involved, however i don`t think that auditory cortex is a problem here(unless you have a lesion due to some sort of damage problem in that part of your brain). Whoever is trying to solve tinnitus in the brain will treat Tinnitus solely as symptom and won`t "cure" it for good (lets say there will be device you connect to your neck and it will take Tinnitus while it is on - you will have to always wear it).
If tinnitus caused by toxic drug that is capable making it to cochlea ad screwing with neurons or acoustic trauma - one and only one "cure for good" will be to regenerate what is lost. Once that is done - Tinnitus will go away, sine your brain will have "normal" connection to neurons in cochlea and there is no need for your body to give you this horrific symptom.
At this moment there are few companies + universities and i believe hearing Restoration Project organization that are trying to get drug/treatment that will promote process of regeneration of these neurons via supportive neurons that humans have and could be turned in to primary (hair cells).
Sorry for lengthy post, i just wanted to express to you what i am thinking of sine we are pretty much in the same boat buddy.