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From: Paul Burke
Subject: Re: Loudspeaker and microcontroller
Date: Wed, 23 Oct 2002 11:44:25 +0000
Organization: Scazon Systems
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>you are working on your computer or doing some
> other task and all of a sudden you get this annoying sound in your ear.
> Yes, you know its the doorbell and you need to answer, but think about the
> mood it has now put you in, especially when you get to the door only to
> find out it's some religious group come to give you "the word of God".
> You could easily lose it and go off the deep end with very little nudging
A doorbell that filters out J. Hoover's Witnesses and Morons... now
there's a challenge!
> I would suggest a simple kind of tone which will get
> your attention without annoying the hell out of you. Take it from a guy
> that has gone to the door in his underwear with a hangover only to find
> someone in a white starched shirt with a satchell and a pile of "Watch
> Towers". :-)
How did your underwear get a hangover (second thoughts, better not
But seriously you can get a reasonable sound just with a logic switching
output. Square waves actually don't sound too bad, a bit like
Northumbrian pipes, and if you want polyphony you could sum a couple of
outputs. Or if you feel REALLY ambitious, use PWM (not so sure about
getting that in a PIC though!)
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