Search found 7 matches

by Gordak
Wed May 14, 2014 2:05 pm
Forum: BioSemi all other topics
Topic: Accessing GSR data using C code
Replies: 7
Views: 11116

Re: Accessing GSR data using C code

Thank you for your time.
by Gordak
Tue May 13, 2014 9:51 am
Forum: BioSemi all other topics
Topic: Reference electrode for GSR
Replies: 7
Views: 10376

Re: Reference electrode for GSR

Hi I have one last question about the measurement of GSR. > Only when one of the two GSR electrodes is disconnected (or has an exceptionally high impedance), the current will be imbalanced and the excess flows to the DRL. The reason why the current does not flow through DRL is that the resistance is...
by Gordak
Tue May 13, 2014 9:22 am
Forum: BioSemi all other topics
Topic: Accessing GSR data using C code
Replies: 7
Views: 11116

Re: Accessing GSR data using C code

Hi First, what is the input data ? The voltage digitized with a LSB = 31.25 nV ? Or the resistance ? Both are proportional, but with a difference of magnitude of10^6. I have some questions about two steps: step 3) Signal1 = 13.3 * Signal1 Can you explain the reason behind this multiplication ? step ...
by Gordak
Mon May 12, 2014 6:15 pm
Forum: BioSemi all other topics
Topic: Reference electrode for GSR
Replies: 7
Views: 10376

Re: Reference electrode for GSR

Thank you so much !

I will have some more questions tomorrow ... You did a great job so far :D

Gordak
by Gordak
Mon May 12, 2014 2:48 pm
Forum: BioSemi all other topics
Topic: Reference electrode for GSR
Replies: 7
Views: 10376

Re: Reference electrode for GSR

Thank you for your explanations ! Some unrelated simple questions first : 1) If my signal in my BDF file has 'nS' as units, can I conclude that my excitation frequency is 16 Hz :?: 2 ) I have some troubles about the digital to "physical" conversion. It is said here http://www.biosemi.com/faq/adjust_...
by Gordak
Fri May 09, 2014 3:24 pm
Forum: BioSemi all other topics
Topic: Reference electrode for GSR
Replies: 7
Views: 10376

Reference electrode for GSR

Hello ! First, thank you for your previous answer. I'm wondering about the use of the reference and active electrodes in the recording of GSR. To measure biopotentials, it is important to have a good common mode rejection ratio. I found some schemes on your website. One of them is about CMRR: http:/...
by Gordak
Sat May 03, 2014 12:22 pm
Forum: BioSemi all other topics
Topic: BDF/EDF converter
Replies: 1
Views: 7095

BDF/EDF converter

Hello I record electrodermal activity with a Biosemi device. I currently read my data from as EDF file previously converted from the bdf file with the converter found on Biosemi website. http://www.biosemi.com/download.htm This converter applies a high pass filter on the data in addition to the conv...