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Old February 10th 19, 11:22 AM posted to uk.tech.digital-tv
Andy Burns[_12_]
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Default Whistling Labgear DA

Bill Wright wrote:

I stood him right next to the sounder (where the noise was almost
unbearable) and asked him what he could hear. He said he could hear a
ticking. I said, "Say 'tick' when it ticks." He said 'tick' in time with
the change from one tone to the other. He could hear a low note,
inaudible to us because of the loudness of the tones, that happened each
time the tones swapped.


When filing past those sounders during fire drills or accidental alarms,
you can feel the resonance change in your skull, a bit like the (bone
conductance?) noise you hear when you scrunch on/off all the muscles
around your forehead/jaw/ears