Re: A86: Re: Bejota would like to know ...[SOUND]

To: assembly-86@lists.ticalc.org
Subject: Re: A86: Re: Bejota would like to know ...[SOUND]
From: Joshua J Seagoe <rabidcow@juno.com>
Date: Mon, 29 Mar 1999 22:30:30 -0800
Delivered-To: assembly-86-outgoing@towerguard.unix.edu.sollentuna.se
Delivered-To: assembly-86@lists.ticalc.org
Reply-To: assembly-86@lists.ticalc.org

not quite.  the reason the calc thinks something is sending data is that
the speaker pulls the data line low (through ~8-16 ohms), which is the
signal used to indicate a bit is being sent. (or there's a line error)
true, you can sometimes use a speaker as a microphone, but the signal is
soooo tiny.  the calc has no way of seeing such minute variations without
extra circuitry.  not to mention that a simple speaker doesn't know the
ti-link protocol! :)

-josh

On Sun, 28 Mar 1999 21:19:20 EST KidFedX@aol.com writes:
>
>Another interesting thing about speakers and microphones is that they 
>are
>basically the same thing.  So you could use headphones AS 
>microphones...
>Granted the quality won't be very great; but it still works.  So the 
>calc
>thinks something is sending data BECAUSE something is sending data...  
>The
>headphones are acting as microphones and picking up all of the sound 
>in the
>room.  Cool huh?
>--Joe
>

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