Re: On the Optacon buzz + some venting
- From: Dorothea Martin <dotty-martin@xxxxxxxxxxx>
- To: optacon-l@xxxxxxxxxxxxx
- Date: Fri, 20 Oct 2006 09:13:46 +0200
Hello, Jim,
I was once studying in a library where construction work was going on. I
couldn't hear the Optacon's buzz at all and the lack of this familiar sound
made it almost impossible for me to read anything. That shows what mind
over matter can do.
Dotty Martin
At 08:18 19/10/06 -0700, you wrote:
>Fran and List,
>
>There is a simplified embossed letter reading system for for blind people
>called Moon Type. It is explained in Wikipedia at
>http://en.wikipedia.org/wiki/Moon_type
>
>In developing the Optacon we tried to reduce the buzz, but it is inherent
>when vibrating reeds are used. Things that we did to minimize the buzz were
>(1) make half of the reeds vibrate 180 degrees out of phase with the other
>half (this cut the buzz by half) and (2) package the array in the cavity
>(perhaps the buzz could be further reduce by putting some sound deading
>material in the cavity?) and (3) setting the vibrating frequency slightly
>lower than ideal for tactile sensitivity because the ear is less sensitive
>and the sound is less annoying with lower frequencies.
>
>Jim Bliss
>
>
>
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