SurveyCan you hear this sound? http://trainhorns.net/sound
      – BorgClown, 2009-03-02 at 04:49:37   (13 comments)

On 2009-03-02 at 04:55:17, BorgClown wrote...
Supposedly only people under 25 can hear this sound. Bollocks, I'm almost 38 and my wife is almost 37, and both of us could hear it easily. The mosquito tones are most likely to guess my age range correctly: http://www.freemosquitoringtones.org
On 2009-03-02 at 06:11:02, Baslisks wrote...
I can hear all of them but some of them just faintly.
On 2009-03-02 at 06:12:04, Baslisks wrote...
Holy shit everyone in the dorms can hear them. I mean as in down the halls. People are freaking out. I have a new toy!
On 2009-03-02 at 10:48:50, Lee J Haywood wrote...
These are the ones I've tried on a large range of people - many sites offer ones that are quite dubious, but these seem to predict ages relatively well. http://discussionator.com/Mosquito.zip You find that some of the higher frequencies can be heard by older people, but very faintly.
On 2009-03-02 at 10:59:06, Thelevellers wrote...
I could hear all the ringtone ones, tho I had to turn the speakers up a little for any below 20khz... Can't believe that they are/were trying to use this idea as a teenager repellent...
On 2009-03-02 at 11:04:49, Lee J Haywood wrote...
It works when the volume is particularly loud, which makes no difference to older people that cannot hear it anyway. http://www.bbc.co.uk/wiltshire/content/articles/2006/04/04/mosquito_sound_wave_feature.shtml The ring tone is used by children to let them use their mobiles without teachers and parents being aware of them.
On 2009-03-02 at 18:30:03, Baslisks wrote...
Yeah, real fail on the people who tried to use this as a repellent...
On 2009-03-02 at 18:36:31, Lee J Haywood wrote...
Why are they a failure? As I understand it, they make a real difference to business affected by anti-social behaviour. The devices are certainly better than something like a taser.
On 2009-03-02 at 19:03:17, Baslisks wrote...
ahh then I retract my statement
On 2009-03-08 at 02:03:42, BorgClown wrote...
I think a "No teens admitted" sign would be a better and less hypocritical repellent. Good-hearing people deserve an explanation before being repelled, irrespective of age.
On 2009-03-08 at 04:30:56, Saywhatagain wrote...
I could hear only faint breezy sound, so duh, I guess that classifies my age somewhat. But I would question just how many " good hearing" people there are in any society today ( most anyway), with decibel levels usually so high, most sounds are disconnected before ever reaching the temporal lobe.
On 2009-03-08 at 05:21:30, Baslisks wrote...
What do you mean disconnected?
On 2009-03-08 at 09:23:35, BorgClown wrote...
I think SWA means we learn to ignore noise. And living in a city means ignoring lots of noise. Also, take in account that crappy built-in computer speakers rarely reach 20KHz frequencies, mostly because many people also can't hear them.