more re: soundcard

From: JBilderback (jiva_at_humboldt1.com)
Date: 2001-05-16 15:30:34


>
> I see a major problem in using sound cards...frequency response. In the medical technology world, eeg acquisition amplifiers are flat in their response from .5 hz to 40. Unless a sound card can have a digital smoothing technique applied through the use of FFT, FIR, or the like, the data is meaningless from a technical standpoint. A roll off of even 1db, unless compensated for in the software, will not be helpful. It is like the old expression of comparing apples and oranges. In order for the data to be useful, the response must be flat or be accompanied by correction table in the software.

regarding these issues ...

this might lead back to using a known card and it's specifications.

the card might be able to generate it's own calibration signals.
("simultaneous record and playback")

> However I share the opinion of Moritz, that the cost reduction
> compared to a uC solution (e.g. AT90S4433) is only marginal.

but this makes the "might be much cheaper" issue moot.



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