Another info, you might want to check out, using the same google hits:
http://www.tinnitusphase-out.com/how.html
"he Tinnitus Phase-Out™ System is a patented treatment method based on sound cancellation principles and is fundamentally different from all other tinnitus treatments currently available.
Using Tinnitus Phase-Out™ proprietary computer software, a healthcare professional analyzes the audio characteristics of the patient’s tinnitus. The sound pattern is matched to the patient’s specific pitch and volume levels. The healthcare provider then applies the phase-shift audio technology to create a treatment program that significantly reduces, and in some cases eliminates, the patient’s perception of tinnitus. This unique solution is programmed into the patient’s own Patient Treatment Device (PTD)."
Another discussion thread:
http://www.medkb.com/Uwe/Forum.aspx/tinnitus/1825/tinnitus-cure
"The question is "which effect is achieving this... is it residual
inhibition ... or phase cancellation ?"
With residual inhibition, the tuning for such a device is not critical (I've
tried it). When the interfering tone is in the general vicinity of the
tinnitus frequency it has the greatest effect.
(a) But if phase cancellation is at work, we would expect to hear a
'warbling' (beat) effect as we approached the tinnitus frequency. This
'warble' would become slower and slower and eventually stop when we exactly
matched the tinnitus frequency.
I did look for, and found no evidence for this warble/beat effect when
trying a sound generator with my own tinnitus. And this should not be
surprising; see (b) below...
It's worth remembering too that many peoples' tinnitus is not a single tone
but a compound tone (further complicated by the interaural pitch difference,
when present). Effective phase cancellation would then become a very complex
matter.
(b) It's true our ear/brain system can indeed distinguish between incoming
_stereo_ sounds which are in phase or in antiphase. However sounds entering
the ear/brain system in antiphase do _not_ cancel out to silence, they just
sound 'different' (hard to describe unless you've heard it but useful to
know when you're phasing up loudspeakers!). This would indicate that the
effect of trying to cancel tinnitus with another antiphased tone might not
be so straightforward either.
Of course actual sound waves out in the outside world _can_ cancel out to
silence when in they meet in antiphase. But we are considering here what the
ear/brain system makes of antiphased signals, not what happens according to
physics in the outside world.
So, my view:
1) At least for stereo sounds, antiphasing just doesn't produce silence in
the ear/brain. Instead things sound 'strange'.
2) I know of no evidence of any 'beat' effect against tinnitus produced
internally by the ear/brain. Such an effect would be observed first if true
phase cancellation to silence were possible. Even if it were, it would
then be incredibly hard to maintain this phase relationship with the high
(and often multiple) tinnitus frequencies.
Steve"