HDF5 doesn't know anything about your channels. The fact that channels are stored in alternating values of the dataset is only known by the application (and you). HDF5 does not do any transformations on the data. If it is asked to store a value as F32LE it just stores the value. Same with retrieval. You will have to find out from vendor how to convert the stored values to the units you are interested in. They are possibly just storing raw sensor data in volts or something similar. I would also poke around the rest of file and look for attributes they might have stored conversion factors in.
David On Wed, Mar 9, 2016 at 1:26 PM, Florian Chmetz <[email protected]> wrote: > Hello, > > > I have *.hdf5 data files recorded with g.Recorder (generated by USBamp, > g.tec GMBH) countaining a H5T_IEEE_F32LE data set with 2 channels values > intermixed: each even index are positive values and odd are negative ones. > So even values correpond to the first channel and odd to the second. So far > so good, however, the mean values of each channel do not correspond > to valid physiological measures. So I'm looking for the value (or > algorithm) allowing to reajuste the values for each channel, but wasn't > able to find it. Do the value transformation for each channel is always the > same for H5T_IEEE_F32LE when storing two channels or this is determined in > the g.tec device and so is independent of the hdf5 file format? > > > Some help will be welcome, many thanks! > > > Florian > > _______________________________________________ > Hdf-forum is for HDF software users discussion. > [email protected] > http://lists.hdfgroup.org/mailman/listinfo/hdf-forum_lists.hdfgroup.org > Twitter: https://twitter.com/hdf5 >
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