It's an "everywhre" hum Trev - Triangulation, you know that. Why does it affect only some people? Moreover, why does it affect a greater percentage of people in a certain age group?
It has to do with the angle of the Cochlea apparently - A 2 degree shift of the outer side of the cochlea downwards and you're stuck with dBC hearing and the darn Hum. I have a NASA report on it somewhere. Hum and overtones: Seals me old fruit....... You hear because hairs inside your ear at different diameters pick up and vibrate at different frequencies of sound (air movement/Sound Pressure Levels (SPL)) if you make a similar SPL the pervasive Hum will be overcome as your "hairs" are vibrating to the hum your larynx is making. It's straight mechanical engineering. Try whistling; makes no difference to the Hum at all. QED? Trev - I'm now relating SADS to this crap. Subharmonics in the power sine wave give bursts of 1 to 40KWatt radiated enery ............ at the same frequency as your heartbeat. Eire has the report that I did, want to take a look? 72 through to 223.1 at 50Hz and 103.77 through to 186.72 at 60Hz, beats per minute. Bang on heatbeat rates - Especially of athletes in the midranges. On Jan 25, 1:49 pm, Trev <[email protected]> wrote: > Seems about right! > I found a while back, in the early days, that moving the head or > snapping fingers would stop hum for a split second. > The ear is very complex and as well as the mechanics of the inner ear > in particular, the effects of the brains interpretations also have a > key role. > In this same arena comes the difficulty in sensing LF direction [by > stereo inference] which makes hum even more pervasive than 'just a hum > somewhere'.. > > On Jan 25, 4:57 pm, Seals <[email protected]> wrote: > > > > > I live in London, and I experienced the hum for the first time from > > Nov 2010 to about Jun/Jul 2011 and it disappeared for a few months > > after that. At that time it had two tones, one higher one lower. It > > mostly stayed low. The blips from lower to higher were sometimes slow- > > paced, other times erratic. It never followed a pattern. The hum was > > generally worse at night, and upstairs, but occasionally it could be > > very loud in the front room downstairs during the day. Apart from my > > mum who only heard it once, I'm the only one in the family who heard > > it. It has recently returned, only at night, and more of a constant > > tone now. It also seems louder than it used to. > > > I've yet to try any sound recording experiments, but I discovered in > > my case something which may or may not be relevant. One night I was > > lying in bed and tried to softly mimic the tone by quietly humming > > with my voice. The moment I made a slight noise, the sound or > > perception of the real hum changed for a second. Any slight hum/noise > > made by myself would 'change' the pitch of the real hum up and I'd > > just catch the sound of the drop from higher to lower as I stopped my > > sound. I tried this several times and it happened every time. I > > thought this was odd how this could happen and was too much of a > > coincidence. Could it be that my own sound waves, however small, were > > disrupting the 'energy' of the actual hum reaching my ears? It was > > about the only thing I could think that would make sense. > > > I'd be interested if anyone else has experienced this, and if not, to > > try this trick yourself and see if you get the same result. You only > > have to make a gentle split-second sound, almost a whisper, as too > > much will drown out the sound of the real hum. > > > Thanks and regards- Hide quoted text - > > - Show quoted text - -- You received this message because you are subscribed to the Google Groups "Hum Sufferers" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/hum-sufferers?hl=en.
