Re: Speakers for High Frequency Sound
From: D.M. Garner (dmg_at_eng.cam.ac.uk)
Date: 02/22/05
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Date: 22 Feb 2005 22:16:36 GMT
In article <1108165220.798267.223400@c13g2000cwb.googlegroups.com>,
<pooua@aol.com> wrote:
>Some people can hear an extremely high-pitched sound generated by
>television CRTs and television cameras. I have long wondered what
>frequency this sound is. So, I am looking around for test equipment to
>help me measure it. I plan to use an audio generator (which I can buy
>for about $200), but I need to find a set of headphones that can
>produce sound at these high frequencies. The low end frequency should
>be about 12 kHz, and I would like to be able to go at least to 50 kHz.
>I am guessing the sound is somewhere around 40 kHz.
Your guess is way out - what you're hearing is the line frequency
which on European PAL TVs is about 15 kHz. I could hear it until
my mid to late twenties; now at age 32 I can't hear it at all.
However, that might be because new TV's aren't as noisy :-)
I'd be VERY surprised if you could hear anything at all above 20 kHz.
David.
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