From: Moritz v. Buttlar (info_at_baltic-microsolutions.de)
Date: 2001-05-14 18:41:34
Hi !
> 2. Amplified input analog signal can modulate a VCO
> which are cheap and
I donīt think this design will be much cheaper then the current design with the
atmel microcontroller.
> readily available. I've designed my own for my work
> and can be made
> available to the group. Due to high sampling frequency
> of the sound card,
> the modulated signal can be easily acquired. Another
> advantage of this
> method is the signal can traverse long distance if
> the patient is much away
> from PC. However, the domdulation will have to be
RS232 can also traverse quite long distances.
> done by PC based software
> (don't know how to do it).
Of course it can be done. The problem is that it requires much more CPU power
then the current design. And more "software technology".
I think it would be interesting if many channels could be modulated on a single
audiosignal. But I think this would require quite expensive electronic parts
(precision sinus generator VCOīs).
> The frequency response
> down to DC (or anyother
> low cutoff freq) is possible with this method.
> Let us focus on the some more (if any) grey areas
> before we commit ourselves
> in the implementation.
Again, I donīt think we win much by designing for soundcards. The whole problems
of opto-isolation and power supply of the different parts of the circuit will
be the same as they are right now. Linear opto-isolation needs parts and that
will result in about the same overall-costs.
Moritz
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