how to sample eeg signals?

[swap10]

hi

i want to implement the following algorithm on eeg signals,

1. a .25sec interval of data is analysed

2. minimum and maximum values are determined

3. .7(min- max) +min is determined and set as threshold

4. the signal data is then compared to the data

5. if the data is > threshold the y-value=1

6. if the data is< threshold the y-value =0

7.this outputs a square wave of which the frequency can easily be determined

i am new to labview . need help in sampling 0.25sec interval of data.

please mail it to s_arolker@yahoo.com

thankyou

Message Edited by swap10 on 03-15-2010 03:04 AM

[srikrishnaNF]

Hi swap10,

  Your data acquistion card will samples the eeg signals for you.So when you acvquire the signals everytime you will get an array of samples based on the no. of samples you are reading and sampling rate.So when you get  that array you make sure that you can extract some part of the array based on this calculation ..no. of samples *1/sampling rate.

Thanks and regards,

srikrishnaNF

[Coq_Rouge]

You may not know this. But Labview is shipped with tons of examples. Go to help in the toolbar and find examples. Then search for acquisition. A good example to start with is the "Cont Acq&Chart Samples-Int Clk.vi"

[muks]

Something like this?

[srikrishnaNF]

Hi muks,

  it may be or maynot as it depends on the sampling rate at which you sampled the eeg signals.

Thanks and regards,

srikrishnaNF