Re: [Openeeg-list] Digital instead of analog for sound card.

[Joe S. <js...@ve...>]

In the FM approach there is no RS-232 data.  The analog brainwave 
directly modulates an audio carrier.  This eliminates the 
microcontroller and a bunch of other circuitry.  There would be no point 
in taking RS-232 data from the current unit and shoving it into the 
sound card, this would just make the data pathway more complicated and 
less efficient.

Joe

no...@le... wrote:

>Just some ideas on sound card use (just thiking about it cause I have no
>rs232 port) :)
>
>Why FM modulate? Why not just send the rs232 data straight to the sound
>card where software can decode it? This would require minimal hardware
>modification (just attenuate the signal a bit with a couple resistors).
>Software for my scanner uses this type of method to decode POCSAG data. I
>haven't looked at the datasheet for the Atmel chips, but I'm guessing the
>baud rate can be put to a speed slow enough for the sound card to handle.
>
>Has this been done? If not, why not?
>
>nomel
>
>
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