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I'm attempting to merge the EDF files and annotations file from NCH sleep databank into a single file (EDF+). Other formats such as .mat or .csv also will do. I am unable to load the EDF files on EDFbrowser. It gives an error saying 'File is marked as EDF+ but it has no annotations signal. File is not a valid EDF/BDF file'. Kindly help. Thanks.
Thanks for using the site. My best guess is that the NCHSDB data contributors stripped out the "EDF Annotations" channel from the original EDF+ files as part of de-identification, yet left the structure of the signal files indicating they were EDF+. Hence, EDFbrowser sees an invalid EDF+ file and refuses to open it.
I think the Luna tool (https://zzz.bwh.harvard.edu/luna/) would allow you to read in the NCHSDB files and then write them out again as plain EDF files.