mne-tools / mne-tools/mne-python
Converting from physical to digital values with FIF
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- Python
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Description
For some calculations I need the original digital value that the signal was saved with for some integer calculation.
For EDF files I can calculate those from the physical and digital minimum/maximum that are saved in the header:
edf_raw = mne.io.read_raw_edf(...)
dmin = edf_raw._raw_extras[0]['digital_min'][ch_idx]
dmax = edf_raw._raw_extras[0]['digital_max'][ch_idx]
[...]
m = (dmax-dmin)/(pmax-pmin)
digital = (m * signal).astype(int)
However, FIF files do not seem to contain such information.
Is it possible to get back to the original ADC values using FIF files?
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start with the EDF conversion shown through mne.io.read_raw_edf, then inspect how FIF stores signal values and scaling metadata. Determine whether the original digital values can be retrieved; done means documenting a supported retrieval path or clearly recording that they cannot be recovered.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- python
- Domain
- data
- Issue type
- Feature
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 25/100