Talk:Nk
Sleep stages may be imported in BIOSIG but only using the C++ compiled program. Note that the BIOSIG Matlab toolbox (in EEGLAB) does not call the Matlab Mex file (mexLoad) that is available in BIOSIG. This one may need recompiling (using the mex command in Matlab) and will allow to import the Nihon Kodhen format.
Regarging the new Nihon Kodhen format, below is a message from Francois Tadel
I spent some time converting EDFBrowser/Biosig's C functions for reading Nihon Kohden recordings in Matlab, and then doing some reverse engineering to understand why this function was not reading correctly the files saved by the newer NK systems (EEG-1200A V01.00).
I found out the information about the channel number and order is now saved in an additional block at the end of the header. The pointer for this new block can be found at address 0x03EE, and it has a similar structure as the other control blocks. I didn't have enough data examples to explore the case with multiple data segments correctly, so I will probably have to fix this in the future.
If you are interested in adding support for the new NK systems in your respective projects, you can get the information you need from these functions: https://github.com/brainstorm-tools/brainstorm3/blob/master/toolbox/io/in_fopen_nk.m (reads the headers of the .EEG, .LOG and .PNT files) https://github.com/brainstorm-tools/brainstorm3/blob/master/toolbox/io/in_fread_nk.m (reads a block of recordings from the .EEG) https://github.com/brainstorm-tools/brainstorm3/blob/master/toolbox/io/in_channel_nk.m (reads the channel names from the .21E file)
