eabouzeid

Thanks for the info. There are an important number of files with this issue (80 out of 454 in Baseline; 111 out of 407 in Followup) so changing the physical min/max manually is tedious. Do you know of any programmatic way to change the physical min/max (pyedflib functions are failing to operate on these files)?

Hi,

While trying to open the CHAT Polysomnography .edf files (with both pyEDFlib code and EDFBrowser app) , an important number of files do not open and throw the following error:

• pyEDFlib code: "OSError: the file is not EDF(+) or BDF(+) compliant (Physical Maximum)"
• EDFBrowser app: "Physical maximum of signal 34 is equal to physical minimum File is not a valid EDF or BDF File"

I believe the issue is that according to the EDF specifications, the digital minimum must be different from the digital maximum (could be to avoid zero division). The question I have is how to fix it and make the file usable?

An example of such files is the chat-baseline-300039.edf

Please let me know.

Thank you

Hi,

In the CHAT study, the EDF file contains different signals with different sample rates. These signals do not come with a timestamp array bu only signal values array. My question are these signals aligned in terms of time, that is for example does the first value in SAO2 correspond in time to the first value recorded by the Pleth signal, eventhough both signals have a differrent sampling rate? Or is there an unknown offset in time between the different signals?

Thank you

Hi,

I am trying to visualise NSRR XML files overlaid onto EDF signal files using the EDF Viewer tool. However the link in the CHAT study to the EDF viewer tool does not work (https://sleepdata.org/community/tools/nsrr-edf-viewer). Where can I find the EDF Viewer tool.

Thank you Elias