Hi There,
I use neurosky with single channel.
I would like to know that when in signal display box appeared , i can enable rules.
On the ruler, I can see start from 0 to ups down from + to - depending on the signal.
I want to know what it means it comes -1000 or 500 ? does it indicate the uV value or
something else
Value in Signal display with rulers
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- Posts: 775
- Joined: Tue Dec 04, 2012 3:53 pm
- Location: INRIA Rennes, FRANCE
Re: Value in Signal display with rules
Hi,
the NeuroSky driver seems to return directly what is returned by the manufacturers TG_GetValue() function. The unit is not indicated in the code that I can see. If you find out, please let us know.
ps. generally you can see the channel unit (voltage etc) by connecting the 'channel units' stream to the signal display and enabling the units. However the driver needs to provide this info, and not all of them do.
Cheers,
Jussi
the NeuroSky driver seems to return directly what is returned by the manufacturers TG_GetValue() function. The unit is not indicated in the code that I can see. If you find out, please let us know.
ps. generally you can see the channel unit (voltage etc) by connecting the 'channel units' stream to the signal display and enabling the units. However the driver needs to provide this info, and not all of them do.
Cheers,
Jussi
Re: Value in Signal display with rulers
I get the info.
(rawValue * (1.8/4096)) / 2000
The unit is volt
How do we get the value using openvibe ?
do we need to do manually !
(rawValue * (1.8/4096)) / 2000
The unit is volt
How do we get the value using openvibe ?
do we need to do manually !
-
- Posts: 775
- Joined: Tue Dec 04, 2012 3:53 pm
- Location: INRIA Rennes, FRANCE
Re: Value in Signal display with rulers
You can insert that formula to the simple dsp box.
Cheers,
Jussi
Cheers,
Jussi
Re: Value in Signal display with rulers
Well, I tried that
from the signal ac. box to simple dsp box.
In dsp box :
(x * (1.8/4096)) / 2000
after that from dsp box to signal display. I cant see the channel units when I press the
channel units button and I cant see Y ruler when I click the ruler.
do we need to have another settings ?
from the signal ac. box to simple dsp box.
In dsp box :
(x * (1.8/4096)) / 2000
after that from dsp box to signal display. I cant see the channel units when I press the
channel units button and I cant see Y ruler when I click the ruler.
do we need to have another settings ?
-
- Posts: 775
- Joined: Tue Dec 04, 2012 3:53 pm
- Location: INRIA Rennes, FRANCE
Re: Value in Signal display with rulers
You can use 'channel units generator' box then to generate a stream specifying the correct unit, and feed the output of that to 'signal display'. One reason why units are not carried in the signal stream is that its hard to automatically change the unit after transformations.
Best,
Jussi
Best,
Jussi
Re: Value in Signal display with rulers
Thanks.
Please attached screem shot at http://imgur.com/a/DTE0g
in the first screen shot :
((x * (1.8/4096)) / 2000 ) * 1000000 ===> to convert from V to uV
in the second screen shot :
i can see y value change. Is this correct ?
I would like to know in dsp box , we mention x , the x is raw value.
The formula is calculated from rawValue.
Please attached screem shot at http://imgur.com/a/DTE0g
in the first screen shot :
((x * (1.8/4096)) / 2000 ) * 1000000 ===> to convert from V to uV
in the second screen shot :
i can see y value change. Is this correct ?
I would like to know in dsp box , we mention x , the x is raw value.
The formula is calculated from rawValue.