"The Norm" - This excellent reference point (not) is based on the hearing of a cognizant child's brain/hearing mechanism NOT hearing a sonic wave in the atmosphere at 1KHz; which he would interpret as 0dB (non-weighted).
Yep, there's definitely something wrong with all of us that hear this darn Hum alright! On Dec 21, 3:06 am, John Dawes <[email protected]> wrote: > On the question of the Hum being either on or off. Consider the > possibility of the individual having a threshold level, which acts > something like a Schmitt trigger. If the Hum energy or the sensitivity > of the individual goes above or below this level it would give the > impression of the Hum being switched on and off. We must remember at > all times that we are not the norm, over ninety per cent of the > population do not hear this thing. For many people the Hum begins > quite suddenly with a change of age and for a few people who had > suffered for many years, it disappeared just as suddenly. I asked some > of these sufferers to think very hard and make a note of any changes > which took place in their homes or their locality or in themselves and > the only answer that I got was that they had put on weight. > > On Dec 20, 2:02 am, Vic <[email protected]> wrote: > > > > > Some that make recording attempts of these low-frequency sonic waves > > probably succeed to some extent. However, from experience I, for one, > > am aware that equipment is manufactured to only record sound that > > occurs in the "normal" band of human hearing. Manufacturers are hardly > > going to produce products that don't sell in the millions- Supply and > > Demand - Particularly in our present "New World Order" where Chinese > > factories are tailor-made to fit the multitude of consumers in the > > West. > > > To do the job right, you need the right tools.......... > > > These successful (together with the unsuccessfulful) recorders make 2 > > fatal mistakes: No reference frequency and playback speaker choice. > > > I do not believe that and have proven that an expensive microphone is > > not required. Mylar is quite satisfactory with a sampling frequency > > rate of 44KHz. computer sound cards are ubiquitously "excellent" in > > quality, their driver software likewise - They are universal (see > > above 1st para). The universal calibration frequency is 400Hz > > (remember the years-ago black and white TV's "Off The Air" picture and > > accompanying 400Hz sound?), This is not a satisfactory frequency with > > "Hum" - 440Hz, the ultra-stable note of A4 is required. Sound is a > > logarithmic function of energy wave disturbance in the atmosphere. The > > Octave function rather than the Frequency function is required. I > > utilized the Fast Fourier Transform Technique to analyse the B0 and B1 > > octaves coupled with AP Tuner, DC Live 7.5, and DSSF3 with success. > > > 2nd. (apparent) failure reason: Normal speaker diaphragms simply lock- > > up and are "glued" to the magnet at these low frequencies All that is > > produced is a high frequency feedback sound. What you need is a > > MASSIVE sub-woofer - That'll work! And I've done it. > > > No one has to actually audibly playback "Hum" - After all, only a > > certain few would hear it anyway. A "waterfall" graph could be used, > > or Spectrograph, or, the previously merntioned FFT Power Spectrum > > scan. Movement is a convincing measurement with humans; hence, I chose > > the "waterfall" for my presentation of the "Hum", backed up by the > > other 2 scans and IACC/Tau/Phi scans. "Hum" is a tough nut to crack, > > ordinary nutcrackers don't work. There are tools out there that DO > > work. I've attempted slowly introduce "Hum" ID and cracking and to > > introduce these tools to the people on this forum who are unfortunate > > enough to be able to hear this atrotious man-made anomaly. > > > Try 'em, they work. Let's go get the darn culprits and put an end this > > nightmare! > > > On Dec 19, 11:12 am, Trev <[email protected]> wrote: > > > > Maybe as the effects on the microphone are unknown, unless separately > > > calibrated for? > > > If professionals aren't sure- they will default to the known, least > > > contentious position. > > > With Hum already being a tricky problem, makes it worse- but one might > > > infer some of these testers had a more biased lean, from what you say, > > > John. > > > A new pillow damping run needed...? > > > > On Dec 17, 3:58 pm, "john dawes" <[email protected]> wrote: > > > > > When people first begin to hear the Hum it is usually in the early > > > > hours and the instinctive move is to cover one's head with a pillow, > > > > however, as we all know this does nothing to stop the Hum. > > > > > Over the years I have met many people who have attempted to record the > > > > Hum . They have used all types of expensive recording machines and > > > > microphones with impressive specifications, however, when I suggest > > > > that the microphone should be covered with a pillow to remove > > > > extraneous noise and allow only the Hum to pass through, they are > > > > strangely reluctant to do so- Hide quoted text - > > > > - Show quoted text -- 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.
