| Q: | Can I use g.BSamp with my own data-acquisition software? |
| A: | Yes, g.BSamp is a stand-alone biosignal amplifier with a ±5 V output
signal on a SUB-D connector. |
| Q: | Is g.BSamp CE certified? |
| A: | Yes, the biosignal amplifier is tested according the medical device normative
(EN60601-l:1990+A1:1993+A2:1995+A12+A13:1996, EN60601-2-26 1994, EN 60601-1-2/1993
and EN 60601-2-25/1995 + A1/1999) and electromagnetic normative. |
| Q: | Is it possible to bypass all filters with a special dip-switch setting? |
| A: | No, for each type of filter (LP, HP) there are two defined values. Only the
notch-filter can be set on/off. |
| Q: | What signals can be measured with g.BSamp? |
| A: | All kind of biosignals (EEG, EMG, EOG, ECG, EMG, respiration,...) |
| Q: | Is it possible to use more than one g.BSamp? |
| A: | Yes, you can stack g.BSamp's to get the appropriate number of inputs. |
| Q: | What does different colors of g.BSamp's ground sockets mean? |
| A: | Different colors show that the depending inputs use separated ground potentials.
Sockets of the same color are powerd by the same supply and are internaly connected. |
| Q: | Is it possible to measure different types of biosignals
at the same time? |
| A: | Yes, the g.BSamp can be manufactured with a maximum of four independent ground
potentials. For example if you want to meassure EEG and EMG you need two independent
ground potentials. |
| Q: | How can I connect the g.BSamp to my existing DAQ-card? |
| A: | g.tec can provide a connector box that makes the connection between your
DAQ-card and g.BSamp. |
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| Q: | Is it possible to create custom paradigms with g.STIMunit? |
| A: | The paradigm parser which comes with g.STIMunit allows the set-up of user-specific
paradigms. |
| Q: | What is the time resolution of the paradigms? |
| A: | The timer works with 1 ms |
| Q: | Is it possible to give biofeedback with the stimulation unit? |
| A: | Yes, the g.STIMunit comes with a 16-channel DAQ board which allows to read
up to 16 input signals that can be transformed to a feedback signal. |
| Q: | Is it possible to control an external device with the stimulation unit? |
| A: | Yes, the g.STIMunit has several digital inputs and outputs which allow to
control external hardware. |
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| Q: | Can I used the Simulink blocks of g.RTanalyze for off-line
and on-line analyzis? |
| A: | Yes, the blocks support the off-line analyzis under MATLAB, the on-line analyzis
with Simulink. |
| Q: | Can I use multiple adaptive autoregressive parameter estimation blocks in one
Simulink model? |
| A: | Yes, the usage of multiple blocks is supported. |
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| Q: | Which data formats are supported? |
| A: | European data format (EDF), BKR, RDF, ASCII and MATLAB format. |
| Q: | How can I create batches for the analyzis of biosignals? |
| A: | The easiest way to create a batch is to perform the analyzis under g.BSanalyze
in the graphical user interface mode. g.BSanalyze reports all commands in the
MATLAB command window. Copy and paste the instructions into a new MATLAB Editor
file and save the batch. Exchange the already analyzed source data file with
the new one and start the batch. |
| Q: | Can I incorporte my own M-files into g.BSanalyze? |
| A: | g.BSanalzye allows to add your own algorithms by copying the files into the
directory gtec/gBSanalyze/user. The software scans this directory for new M-files
and adds them to the menu. |
| Q: | Which documentation is included? |
| A: | g.BSanalyze comes with a printable documentation, a on-line documentation
and a function help for batch processing. |
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| Q: | On how many people was g.BCIsys tested? |
| A: | We tested together with the University of Technology Graz the system on about
300 subjects. About 90 % were able to control the system within 30 minutes with
an accuracy above 60 %. About 6 % were able to control it with an accuracy above
90 %. |
| Q: | Which accuracy can be achieved after longer training? |
| A: | Two subjects achieved a perfect classification of 100 % after several month
of training. |
| Q: | Was the system tested with subjects? |
| A: | Yes, the system was and is currently tested with an ALS and a paralized patient. |
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| Q: | Why are new created or changed m-files on my network drive
not recognized by MATLAB? |
| A: | MATLAB makes use of a feature of the Windows operating system called a Change
Notification Handle that enables MATLAB to be notified any time a file in an
associated directory is modified. Under certain circumstances, Windows may fail
to provide MATLAB with a valid and responsive handle. For a detailed solution
type 'help change_notification' or 'doc change_notification' on MATLAB command
line. (Mathworks Solution Number 25963) |
| Q: | Why do I get permission and/or corrupt file errors when
using the SAVE command? (The errors seem random and sporadic.) When I save my MATLAB workspace, I get an error about "permission denied"
or "could not open <filename>. File may be corrupt". (The errors
seem random and sporadic.) |
| A: | This problem is most likely caused by the avalability
of Change Notification Handles in the Windows operating system. For more information,
please read the documentation on "change_notification" and "change_notification_advanced".
You may need to consult with your system administrator to figure out whether
you are working with a supported file server. You should also try some of the
options listed in the HELP. Some customers have found that this problem can occur when there are too many directories on the MATLAB path, so you should try removing some of them. If there are too many, Windows may run out of resources for Change Notification Handles. (Mathworks Solution Number 32639) |
| Q: | Why does UIIMPORT not work correctly if I specify an output argument? If I
use UIIMPORT without specifying an output argument, it works as expected. If
I specify an output argument; however, I get the following : >> s=uiimport('test.txt') Warning: Index exceeds matrix dimensions. > In D:\Applications\MATLAB6p5\toolbox\matlab\uitools\uiimport.p (doFinish) at line 541 > In D:\Applications\MATLAB6p5\toolbox\matlab\uitools\uiimport.p at line 107 s = [] In this case 'test.txt' is a very simple CSV file. |
| A: | This issue has been forwarded to MATHWORKS development
staff for further investigation. As a workaround, please follow these steps: 1) Delete $MATLAB/toolbox/matlab/uitools/uiimport.p, where $MATLAB is your MATLAB root directory. 2) Edit the $MATLAB/toolbox/matlab/uitools/uiimport.m file. 3) Change line 493 of the uiimport.m file from out.(vname) = ad.datastruct(names{i}); to out.(vname) = ad.datastruct.(names{i}); by adding a period between "datastruct" and "(names{i})"; 4) Exit and restart MATLAB. |
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| Q: | Should we use gold or Ag/AgCl electrodes for EEG measurements? |
| A: | It depends on the application. Ag/AgCl electrodes have a better frequency characterisitc
but need some maintance. Gold electrodes are almost maintanence free. |
| Q: | What is needed to measure respiration? |
| A: | g.tec provides a respiration belt that can be connected to an input of g.BSamp. |
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On Japanese notebooks set System Font Size to Normal, use Classical Windows Look.Under Region Settings, Advanced Settings: Select a language version with non-unicode programs (change from Japanse to English). |
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