Re: [MLUG - DISCUSSION] Teen Repellent

["Mark Rages" <EMAIL:PROTECTED>]

On 6/6/06, Chris Wolfe <EMAIL:PROTECTED> wrote:
> On a related note, can any of you hear the high pitched whine that
> CRT-style TVs make?  Especially the older big models.  I've been able to
> hear those all my life.  It's kind of like this teenbuzz, but maybe a
> little higher Hz, and being right behind some TVs could be almost
> "deafening".  I remember riding my bike around town when I was younger
> when people used to leave their windows and doors open, and could hear
> that tone from some tv sets.
>
> --Chris

I don't hear it so much anymore.

US TVs have 525 lines, scanned 30 times a second = 15750 Hz.

I've tested my hearing before, using a piezo tweeter and a test
oscillator.  I can make it to about 16 kHz.  I haven't tested
recently.

Does anyone know if you play a frequency you can't hear, say 18kHz,
and you put your ear next to the speaker, if that can cause hearing
damage?  I know high frequencies are worse than low for causing
damage, but the damage is in the nerves, rather than the physical
acoustics of the ear.

Regards,
Mark
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