I suggest you first visit a physician and ask about tinnitus. Sometimes
your
ears (or the auditory systems in your brain) can produce high frequency
sounds just like what you describe.
I have had ringing in my ears continuously for several decades now. It is
usually just mildly annoying but sometimes is very distracting and
unpleasant. I have been examined by audiologists twice who reassure
me that there is nothing seriously wrong. But they indicate that there
certainly are many people for whom the sounds are truly unbearable.
There are things they can do. See your physician!
"Juliet" <juliet at cellucity.co.za> wrote in message
news:99715l$a8r$1 at ctb-nnrp2.saix.net...
> Actually some type of microwave device is being pointed directly at my
> house. The high frequency sounds it produces are unbearable.Have you heard
> of low pass and white noise filters ?Can they help in this regard ?
>> "Richard Norman" <rsnorman at mediaone.net> wrote in message
> news:2Rxt6.11$QA3.3747 at typhoon.mw.mediaone.net...> > Is there some reason you want to block ultrasounds that you can't hear
> > anyway? Is there some reason to believe that microwave ovens
> > produce ultrasound frequencies?
> >
> > I am just curious. In any event -- sound, like light, travels in
> straight
> > lines when
> > considering distances much larger than the wavelength. Sound bends
around
> > objects (diffracts) if they are smaller than the wavelength.
> >
> > So bass sounds (frequencies to several hundred Hz and wavelengths of
> greater
> > than 1 meter) tend to wrap around barriers, but very high frequency
sounds
> > (frequencies of 10kHz or so and wavelength of a few cm) are easily
> shielded.
> > Ultrasonics above 33kHz have wavelengths of less than 1 cm and so a
simple
> > styrofoam box will produce adequate shielding.
> >
> > "Juliet" <juliet at cellucity.co.za> wrote in message
> > news:995rvq$ltp$1 at ctb-nnrp2.saix.net...> > > any suggestions how one can block ultrasound frequencies ?Is there an
> item
> > > on the market that can absorb or block high frequency sounds being
> emitted
> > > by microwave or other devices?
> >
> >
> >
>>
