On Feb 19, 2:02 pm, [email protected] wrote: > Mr Thompson said he had established that the noise - which he has > recorded - has a frequency of about 40 to 42 cycles a second, but such > a long wavelength that it was virtually impossible to establish the > direction of the source. > Intensive research has been conducted into the Cambridge hum by the > Department of Acoustics at Chelsea College, London. Despite the use of > directional microphones researchers have so far been unable to detect > the source of the external hum plaguing the Langs.
In my experience in recording a distant diesel engine, directional microphones will be no use. How to find the source: Get people over a wide area who can hear the hum to listen carefully outside and estimate the direction it's coming from. I can do that so it's not hard. Write down the compass bearing and location of the observers. Plot those directions on a map. Where the lines intersect is the source of the hum. If nobody is interested in even trying this, I suggest you are all wasting your time. --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
