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Medical Forum / Diseases and Disorders / Tinnitus / October 2004combatting T with phase inverted sounds
Hello, Well here is a litle experiment that I am trying at the moment. I determined 1 of my T sounds to be at some 7000 hz. Now in theory, when you invert the phase of a sound and you place an exact normal sound on top of that you would get a reaction that makes the noise quieter. The big problem is that the exact T frequency never stays the same, and that you have to almost exactly match the amplitude of your T with the synthetic sound you are creating (in programs like sound forge or so).. I had half satisfying results in wich I caused the T in my right ear to be more quiet . I'd like to see if there could be a noise generator that could generate inverted noise around a specific given frequency, so you can fine tune it to actually have a sound that is tuned to your needs and could not only mask your t but at the same time because of all the inversions on the specific frequency regions, reduce it.. You'd swat 2 flies with one blow if that could be possible -- > Hello, > [quoted text clipped - 18 lines] > > You'd swat 2 flies with one blow if that could be possible Even if it were practicable to produce a sound (or sounds) that could maintain an accurate antiphase to the high tinnitus frequencies over a reasonable period, and even assuming that the tinnitus signal(s) itself were stable enough to be amenable to this treatment, IMO this would still not work. This is because the tinnitus is a signal in the nervous system - it's not a 'wave'. By the time the sound signal is processed by the cochlear it's probably not an AC signal (like that within an audio lead) but a complex pattern of stimulation in the auditory nerve fibres. But the tinnitus has to be a _wave_ if it is to be cancellable by another wave. The deadening effect you're finding from feeding in a tone is more likely due to something else - residual inhibition. I too have been playing with tones and have obtained useful results (at least for my own tinnitus); see www.detinnitiser.com if you're interested. Cheers Steve O > Hello, > [quoted text clipped - 18 lines] > > You'd swat 2 flies with one blow if that could be possible Most signal generators permit frequency, amplitude and phase adjustments. The problem lies in having a sample of the T when adjusting the generator to produce the canceling signal. It is impossible to accurately cancel a signal without knowing these parameters, and the T signal has never been sampled. I suppose you could listen to the output of such a generator, trying to adjust it so you didn't hear either it or your tinnitus. If it worked at all, I suspect it would work for fleeting moments. It is more likely that even if you could sample the T sound in order to cancel it variably and in real time, that sound would have been perceived well before the cancellation took place. |
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