From: Doug Sutherland (wearable_at_earthlink.net)
Date: 2001-11-30 13:31:00
Hi Jim-P,
> A fantastic bunch of links, Doug !! (I'm going to follow up
> some of those wavelet links). How about putting those links
> on the web-site as `research material' or something like that ?
I've collected an sload more links, will put them up on the
web soon. Lots of more biopotential theory, signal processing,
and also affective computing, I'm pretty fascinated with the
idea of a computer knowing when you are flustered and slowing
down, knowing when you're excited and flashing more ideas at
you in semi-random fashion, stuff like that. It's definitely
an interesting age we live in.
> A response of 0.1-100Hz is not possible when sampling at
> 120Hz. In theory the maximum is 60Hz, but even then detection
> of a 59Hz signal would be rather unstable (going in and out
> of phase with the sampling frequency). I like the
> recommendation you quoted from the "IFCNStandards" of using
> a higher sampling rate, say 200Hz.
200 Hz does indeed sound like a good number. 12-bit ADC too.
> The overhead of monitoring voltage levels or interrupts
> could be bypassed by feeding the pulse-width-modulated
> signal to a soundcard input which will buffer it for us.
I haven't looked much into that idea, I think modern uCs
can suffice in boosting the sampling rate and resoltion.
> I have two Linux-based laptops, neither with IrDA. One has
> audio and serial inputs, and the other has only USB ports.
> Hopefully I should be able to pick up a cheap USB<->serial
> or USB<->IrDA adapter (there are a few listed as supported
> in Linux).
My vote would be *optional* infrared interface. I would
prefer RS232. I want to bolt the EEG onto embedded PCs.
The wireless link is on another plane of existence then :)
I'd like to bolt that EEG onto one of my wearables, here
are two of many protos I've done:
http://home.earthlink.net/~wearable/fashion-wearable.html
http://home.earthlink.net/~wearable/jacket-wearable.html
> I'm interested in developing some simple command-line stuff
> for Linux, to play with ideas. For example, I'd like to
> pitch-shift the brain signal up to audio frequencies so that
> I can hear myself think.
Cool idea. The other Jim has done some neat stuff with
audio and tactile feedback. Check out his page.
http://www.MeissnerResearch.com/
My clothing already talks and listens <grin> so I like
your idea, I definitely want audible feedback.
> I've found some nice digital filter design software, though
> -- gmeteor (see Google).
Cool, I found gmeteor, been looking for FIR software. If you
have any other good resources for IIR/FIR concepts/theory
and/or software, please let me know and I will add them to
my growing list of resources.
-- Doug
>
> I'm really interested to see where this project is heading.
>
> Jim-P (not the other Jim)
>
> --
> Jim Peters (_)/=\~/_(_) Uazú
> (_) /=\ ~/_ (_)
> jim@ (_) /=\ ~/_ (_) www.
> uazu.net (_) ____ /=\ ____ ~/_ ____ (_) uazu.net
>
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This archive was generated by hypermail 2.1.4 : 2002-07-27 12:28:32 BST