I recorded the sound using a small laptop with its internal microphone. I then used Spectrum Lab to analyse the recorded file. The frequency is a very stable 98.5Hz so unless I have made a mistake here, it is not related to mains frequency. I have been running Spectrum Lab for several days to see if it switches off at any particular time but its been on solid for the last 3 days.
I really need to make a recording with less noise. I have a measurement microphone for my loudspeaker measurements but its not portable enough and needs "phantom" power. Frank On Jun 15, 6:12 am, dboots <[email protected]> wrote: > Hi Frank > > some form of sound density pressure wave forms seem to be a running > theme > > What kind of microphone did you use? > Does the software give any idea what band of the spectrum the > frequency is in??? > Does the software give any idea if it is a low frequency MHz of a > characteristic??? > > Interesting your description if you walk in the direction of the Hum > it disappears > > Dee > No Calif > > On Jun 14, 2:03 am, Frank <[email protected]> wrote: > > > > > > > > > I am currently investigating my hum in the southwest of England. > > I can confirm that this one is an acoustic pressure wave (sound) and > > not something esoteric. > > I have been able to detect it using a microphone and view it using a > > PC with audio spectrum analyser software. > > > Its characteristics are: > > It is louder outside the house than inside. > > It is louder at the front of the house. > > My Wife can also hear it. > > It is constant level but switches off abruptly as I have heard several > > times. > > > Hearing is not so good at direction at such frequencies but if I walk > > in the the direction that the hum "seems" to be coming from, it > > disappears. > > The level is highest just outside the front of my house! > > There is no industry within the immediate area so its source still > > remains a mystery. > > > Frank > > > On May 5, 12:23 am, Jim <[email protected]> wrote: > > > > Steve, > > > I live in East Aurora,NY > > > > Jim > > > > On May 4, 9:30 am, Steve K <[email protected]> wrote: > > > > > Sorry to hear you have had it so long. we started hearing it in > > > > western CT around Sept 2009. Our proofing looks top be changes in > > > > natural gas distribution operations in our case. The theory is this > > > > is a national problem, having been occurring for years some places and > > > > accelerating in the last 4 yers to other areas. Where do you hear teh > > > > HUM- town and stte is good enough > > > > > Steve > > > > > On May 4, 8:11 am, Jim <[email protected]> wrote: > > > > > > My name is Jim and I am 64 years old. I have been hearing a low > > > > > humming for 20 years now. I can't say that it is annoying as I am > > > > > quite used to it by now. The best way to describe it is: a > > > > > soft,low,hum that sounds like a hot air forced furnace when it is > > > > > running or a distant train going down the tracks. Oddly enough, when I > > > > > really notice the hum is when it turns off. Being on so often, the > > > > > quiet of not hearing the hum is unusual. I could never hear the hum go > > > > > on but I sometimes hear it switch itself off during the night while > > > > > laying in bed. My wife thinks I'm nuts.... > > > > > > Jim- 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.
