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The Emperor has no Ears...
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dilletante, with some embroidery by me.
Humans can hear from around 20hz or so to around 22khz.
Well, some humans can.
We start losing the really high frequency bits when we're about twenty, and it's all downhill from there.
So, in the UK, they had the bright idea 'if we play loud tones that are high enough frequency that teenagers can hear them but adults can't, teens won't congregate.' This appears to work. Listen to an example here.
However, the Street finds it's own uses for technology, and the kids returned fire. They started passing around a high frequency tone as a ringtone, so that they could hear phones going off in class and the teachers couldn't. Hilarity ensues.
I was a bit skeptical when I heard this, so I asked a six year old I happened to have handy over to my desk, and requested 'please listen to this and tell me if you hear anything.'
She reported hearing both tones.
Yow. Just yow.
No cubs over fifteen, Billy!
Ever heard of a cub with a green flower?
dilletante, with some embroidery by me.Humans can hear from around 20hz or so to around 22khz.
Well, some humans can.
We start losing the really high frequency bits when we're about twenty, and it's all downhill from there.
So, in the UK, they had the bright idea 'if we play loud tones that are high enough frequency that teenagers can hear them but adults can't, teens won't congregate.' This appears to work. Listen to an example here.
However, the Street finds it's own uses for technology, and the kids returned fire. They started passing around a high frequency tone as a ringtone, so that they could hear phones going off in class and the teachers couldn't. Hilarity ensues.
I was a bit skeptical when I heard this, so I asked a six year old I happened to have handy over to my desk, and requested 'please listen to this and tell me if you hear anything.'
She reported hearing both tones.
Yow. Just yow.
No cubs over fifteen, Billy!
Ever heard of a cub with a green flower?
no subject
SACD and DVD-Audio experiment: There have been many arguments about whether the extended frequency response available on these formats is worth your while. Regular CDs can reproduce up to 22.1KHz. SACD and DVD-Audio discs can push close to 100KHz. There are tons of arguments that say that you can hear (or even "feel") the extended frequency range. Those with "golden ears" say that they can tell the difference between the CD and the SACD/DVD-A version of an album. Others say hogwash - that the golden ears are actually hearing the remastering differences and the different electronics that SACDs and DVD-As go through.
Here's what I propose: Set up a double blind test. Scenario "A" is to play a disc (CD, DVD-A, SACD, it doesn't matter) through a stereo system. Scenario "B" is to do exactly the same thing as in "A", but you add another stereo system that's playing a bunch of high frequency crappola. If the test subject can actually hear of feel a difference, he or she should be able to say whether scenario A or B is playing.