Target Response Box Sampling Rate
Posted: Thu Dec 31, 2015 11:40 pm
Hi,
I am new to Openvibe, I am working with the p300 xDAWN scenarios. So far, I have connected my Emotiv Epoc + headset to the acquisition server, I have collected the initial data and trained one letter with the p300 xdawn-1acquisition.xml. I opened p300-XDAWN-2-train.xml to read data from the .ov recorded file, after running this in fast mode, I opened the p300-xdawn-3train-classifier.xml and made generic stream reader read that same .ov file, I ran that in fast mode. However, I received two warnings stating:
"[WARNING] At time 15.086 sec <Box algorithm::(0x000012c5, 0x00004d5a) aka Target response> Sampling rate [31] suggested by chunk properties differs from stream-specified rate [32]. There may be a problem with an upstream box. Trying to use the estimated rate.
[WARNING] At time 30.086 sec <Box algorithm::(0x000012c5, 0x00004d5a) aka Target response> Your signal does not appear to be continuous in time. Previously inserted buffer ended at 29.6621s, the current starts at 29.3672s. The display may be incorrect."
I have been following this open vibe thread: viewtopic.php?f=17&t=401
specifically this section:
"I suggest you to use the p300-speller-xDAWN, it has better result than the p300-speller.
First, for the acquisition, it's better to use this process:
Learn one letter with the “p300-speller-1-acquisition.xml” scenarios, for this, in the line 8 of the file “p300-speller-stimulation.cfg” changed the SettingValue by 1.
Next, in the scenario “p300-speller-2-train-xDAWN.xml” load the file “${Path_Samples}/signals/p300-speller-xdawn-1-[Record_Date].ov” and start the player in fast mode.
For the scenario “p300-speller-3-train-classifier.xml” load the same file and start the player in fast mode.
This process initializes your configurations files.
For learning, used the “p300-speller-4-online.xml” with 10 letters (in the line 8 of the file “p300-speller-stimulation.cfg” changed the SettingValue by 10).
Next, used scenarios “p300-speller-2-train-xDAWN.xml” and “p300-speller-3-train-classifier.xml” with the newest record in the "signals" folder. You can see in the console the classification percent. For a good result this value need to be better than 83,3%.
To finish you can make your test with the “p300-speller-4-online.xml” scenarios."
to make the p300 scenarios work. How do I fix those warnings and match the sampling rate with the stream specified rate and how can I get it to run continuously.
Thank you so much for your time and any help will be greatly appreciated!
Best,
Jaspreet
I am new to Openvibe, I am working with the p300 xDAWN scenarios. So far, I have connected my Emotiv Epoc + headset to the acquisition server, I have collected the initial data and trained one letter with the p300 xdawn-1acquisition.xml. I opened p300-XDAWN-2-train.xml to read data from the .ov recorded file, after running this in fast mode, I opened the p300-xdawn-3train-classifier.xml and made generic stream reader read that same .ov file, I ran that in fast mode. However, I received two warnings stating:
"[WARNING] At time 15.086 sec <Box algorithm::(0x000012c5, 0x00004d5a) aka Target response> Sampling rate [31] suggested by chunk properties differs from stream-specified rate [32]. There may be a problem with an upstream box. Trying to use the estimated rate.
[WARNING] At time 30.086 sec <Box algorithm::(0x000012c5, 0x00004d5a) aka Target response> Your signal does not appear to be continuous in time. Previously inserted buffer ended at 29.6621s, the current starts at 29.3672s. The display may be incorrect."
I have been following this open vibe thread: viewtopic.php?f=17&t=401
specifically this section:
"I suggest you to use the p300-speller-xDAWN, it has better result than the p300-speller.
First, for the acquisition, it's better to use this process:
Learn one letter with the “p300-speller-1-acquisition.xml” scenarios, for this, in the line 8 of the file “p300-speller-stimulation.cfg” changed the SettingValue by 1.
Next, in the scenario “p300-speller-2-train-xDAWN.xml” load the file “${Path_Samples}/signals/p300-speller-xdawn-1-[Record_Date].ov” and start the player in fast mode.
For the scenario “p300-speller-3-train-classifier.xml” load the same file and start the player in fast mode.
This process initializes your configurations files.
For learning, used the “p300-speller-4-online.xml” with 10 letters (in the line 8 of the file “p300-speller-stimulation.cfg” changed the SettingValue by 10).
Next, used scenarios “p300-speller-2-train-xDAWN.xml” and “p300-speller-3-train-classifier.xml” with the newest record in the "signals" folder. You can see in the console the classification percent. For a good result this value need to be better than 83,3%.
To finish you can make your test with the “p300-speller-4-online.xml” scenarios."
to make the p300 scenarios work. How do I fix those warnings and match the sampling rate with the stream specified rate and how can I get it to run continuously.
Thank you so much for your time and any help will be greatly appreciated!
Best,
Jaspreet