From: Jim Peters (jim_at_uazu.net)
Date: 2001-12-01 11:00:17
Answering a couple of posts in one go ...
Jim Meissner wrote:
> Mr. Nyquist was not violated. Doug combined two statements. I
> built a system that transmitted 3 bytes at 9600 Baud, that is two
> channels with a reference byte. With that configuration I was able
> to run at a 200 to 300 Hz rate. The other version transmits 5
> bytes, or 4 channels. On that version I set the sampling rate so
> that I see about 65 to 70 Hz. That avoids the 60 Hz causing
> aliases.
Oops -- I didn't connect Doug's comments with your previous posting.
Sorry about that.
sleeper75se_at_yahoo.se wrote:
> > This is where most of thee hard work lies. I am a
> > software guy. How can I get myself up and running with
> > the current design? Can it be breadboarded? Is there
> > any software for the PC side yet?
>
> If we design a simulator first, then we wouldn't need the hardware.
> Here's a proposal: A program that allows the user to draw (using the
> mouse) a frequency curve, then transforms it into a FIR-filter by
> using the inverse fourier transform. Apply white noise to the FIR-
> filter and we have a simulated EEG-signal.
Yes, that could be done, but where's the fun in that ? It doesn't
really get interesting until you have some real live data to play
with. Having never played with an EEG device, I'm not going to know
how I want to approach it until I see how the data behaves.
I've had a read through the PDF on the web-site now:
http://openeeg.sf.net/design_challenge/design_challenge.pdf
This is all excellent stuff. If there is a microcontroller compiler
available for this processor for Linux, I'll certainly be up for doing
some coding of modules to download. And, like my SBaGen tool,
(sbagen.sf.net), I'm very happy to use the GPL and open-source
everything.
I also downloaded the schematics from the project page:
http://sf.net/projects/openeeg/
But I obviously don't have the correct software to view these.
As soon as this design gets to the stage where I can build the thing
using a soldering iron and a simple multimeter (no fancy test gear),
I'd very much like to try it out.
Jim
-- Jim Peters (_)/=\~/_(_) Uazú (_) /=\ ~/_ (_) jim@ (_) /=\ ~/_ (_) www. uazu.net (_) ____ /=\ ____ ~/_ ____ (_) uazu.net
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