From: yaniv_vi (yaniv_vi_at_yahoo.com)
Date: 2002-02-17 01:20:36
hi
here's a good link for a eeg/ecg/emg system design .
http://www.biosemi.com/faq/more_than_16bit.htm
to sum it up , since we use ac mode (dc input filtering) ,
if we use 1uv step size , we would need a 4khz/16bit adc for each
channels . for 2 channels ,for example => 2*4*16kbit/sec =128kbit .
that means we can't use simple rs232 port unless we use some kind
of data compression .
anybody here think he can design such a think (16 bit) ?
BTW , does anybody knows what are the minuses of ac mode for this
kinds of measurements ?
and another question is : what's the use for a full ecg in
biofeedback ? ain't measuring heart pulse via finger is enough ?
--- In buildcheapeeg_at_yahoogroups.com, "sleeper75se" <sleeper75se_at_yahoo.se> wrote:
> --- In buildcheapeeg_at_yahoogroups.com, "John Morrison" <jmorrison_at_ahc.net.au> wrote:
> > Just wondering if we NEED a separate ECG or can the EEG be used
> > multifunctional ???????
>
> Hi John,
>
> ECG signals are stronger than EEG. Not sure how much though.
> Joergs 10-bit ADC should be able to handle 1mV signals, and my 12-
bit
> ADC handles 4mV (so far my design is just theory). If you need
more
> range, you can install a potentiometer or switch on the input
stage
> that lowers the gain.
>
> Regards,
>
> Andreas
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