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the annotation mnemonics in EDF+ files do not in general match those used
in WFDB-compatible annotation files, so that it will often be desirable
to translate those that come from EDF+ files before converting the text
with wrann. For example, this command can be used to extract annotations
from foo.edf, change the EDF+ annotation type "QRS" to the WFDB type "N",
and then produce a WFDB-compatible annotation file foo.edf.qrs:
rdedfann -r foo.edf | sed s/QRS/N/ | wrann -r foo.edf -a qrs
Recent versions of wrann copy unrecognized mnemonics into the aux field, setting the annotation type to NOTE, so it is no longer essential to translate mnemonics as described above before processing rdedfann’s output with wrann.
It may be necessary to set and export the shell variable WFDB (see setwfdb(1) ).
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