From: Rob Sacks (editor_at_realization.org)
Date: 2001-05-18 18:27:05
Before we get too excited about this idea it might
be good to produce a document that lists all the
advantages and disadvantages.
At a minimum, it would be good to see numbers that
estimate the overall cost to users of both complete
systems including electrodes. It's not clear to me
that the savings are significant.
Also, it would be good to see estimates of
all the relevant performance metrics for both
systems. Joerg just estimated 7-bit resolution for the card
with one particular decoding method. What about dynamic
range, etc., and how do all these measurements compare
with the "non-sound card" system?
On the software side, we still don't know whether
we would have to write separate versions of the
program for each individual sound card, or whether
we could take advantage of some kind of
standard abstraction layer in the operating system.
This makes a huge difference in how practical it
will be to maintain the code.
If it turns out that we need to write separate code
for each soundcard, I would view that fact as a
strong disadvantage, because soundcards become
obsolete and get withdrawn from the market by
their manufacturers. When that happens, our system
will become useless to people with new computers
unless somebody writes a new soundcard driver.
And is there any guarantee that such drivers could be
written for future sound cards?
----- Original Message -----
From: "Praveen Kumar" <pkk7_at_y...>
To: <buildcheapeeg_at_yahoogroups.com>
Sent: Friday, May 18, 2001 1:07 PM
Subject: Re: [buildcheapeeg] Sound Card-Phase II
> Hi everyone,
> Its heartening to see a clearer picture emerging out
> of our discussions.
> A 2 channel system with VCOs and sound card appears to
> be the right choice. The saving in hardware will put
> more burden on the software. I'm sure the software
> guys would rise to the occasion. The following points
> are still tickling in my mind.
> 1. Whether a 2 channel EEG machine would deliver
> meaning full performance - systems people to please
> comment
> 2. VCOs and PLL based demodulator (SW) would give
> required linearity and stability etc. Joerg Hansmann
> and others may throw some more light on SW algorithm,
> too.
> Cheers,
> Praveen
>
>
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This archive was generated by hypermail 2.1.4 : 2002-07-27 12:28:30 BST