Hi Trev. I suggest you to use a pair of good headphones or a subwoofer. I'm not sure I understand what you asked me: If you mean a spectrum peaks analysis, here it is:
<https://lh5.googleusercontent.com/-MfBAFd2x0Og/UbcUeVLU-mI/AAAAAAAAAQ8/K_W_F60vTb0/s1600/Schermata+2013-06-11+a+01.34.54.png> In the peaks, the signal at 30 Hz reaches levels of about 59 dB SPL, which is conventionally just below the threshold of audibility, meaning that an individual with an average sensitivity will not be able to perceive it, while someone with a sensitivity even lightly above the media, in favorable conditions, could hear it. The spectrogram instead you can see it on the youtube video I linked! The instrumentation I used is of excellent quality: professional low-noise Schoeps and Sennheiser microphones that go down very low in frequency and a professional TASCAM digital recorder with battery operation to avoid direct induction from the power supply (the signals at 100 and 200 hz are radio signals from the mains). The home owner, a hummer, could hear the hum during recording, I don't. Sorry but my English is at school level, I don't speak it very well...I hope I understand what you meant. otherwise re-explain it :) Thank you Luca Il giorno lunedì 10 giugno 2013 15:06:58 UTC+2, Trev ha scritto: > > Interesting work Luca.. > I have to be honest and say it doesn't sound like my hum. Quite a low > level to get through my PC speakers maybe didn't help. > Did you get a harmonic frequency analysis at the same time- ie:spectral > spot freq peaks? > What I did pick up was a wider band, less pointed steady hum, than mine. > I know that your measuring gear could be getting part of the story, > though- Hum is notoriously difficult to nail. > ie: It could be co-incidental hum related noise at your location. > The big ?? is- was human hum pick-up detected at the same time and with > similar modulation? > Regards Trev > > > On Friday, 7 June 2013 00:48:10 UTC+1, Luca Rizzardi wrote: > >> Hello. >> I'm Luca, a sound engineer from Italy. >> I am not a hummer, but I spent the last 9 months studying The Hum, with >> the assistance of my university advisor and two hummers of the area. >> I studied a lot of the theories and publications about the phenomenon (in >> particular those of Chris Barnes and Tom Moir), analyzed testimonies and >> data from different forums like this and The World Hum Map and Database, >> studied the behavior of the phenomenon and formulated my hypothesis. >> Finally I have successfully recorded The Hum. >> >> On this link <http://www.youtube.com/watch?v=MhNCdzA6Fmc> you can listen >> to my recording and see the spectrogram. >> Frequency of the noise is around 30 Hz. >> >> This is my >> thesis<http://www.scribd.com/doc/144697878/Luca-Rizzardi-Conservatorio-C-pollini-Padova-The-Hum>, >> >> unfortunately in Italian language. >> I would be happy to exchange some opinions with you. >> >> Luca Rizzardi >> >> >> >> >> -- You received this message because you are subscribed to the Google Groups "Hum Sufferers" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/hum-sufferers?hl=en. For more options, visit https://groups.google.com/groups/opt_out.
