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 -- 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.
