multiple annotation channels

[hkokur]

hello,

i am trying to write the classifications of two different technicians into one edf file and i need to write both classifications seperate annotation channels. is pyedflib/edfplus support the multiple annotations channel and how can i write two different classification seperate channel?

[DimitriPapadopoulos]

Does EDF+ allow multiple channels?

The EDF+ specs refer to a single annotations signal in 2.2.1. The 'EDF Annotations' signal:

This signal is identified by giving it (in the EDF+ header) the label 'EDF Annotations'.

[DimitriPapadopoulos]

You may add a prefix to each annotation, to distinguish between technicians:

• tech1: here is an annotation
• tech2: another annotation

[skjerns]

I don't think there is a way to add a second annotation channel without violating the EDF specifications (correct me if I'm wrong!). So this can only be solved by manually using some char in front of the annotation.