[Mne_analysis] notch filter for removing power chord signal

[sheraz at nmr.mgh.harvard.edu]

Hi Denis,

As Alex said SSP cant be used to remove line frequency, as its comes from
electronics.

If you go mne-Matlab way, you can use eegfilt to have notch filter or try
harmonics filter which works better for line frequency. For reading and
writing raw fif file look at mne_ex_read_write_raw.m.

sheraz



> 2012/9/12 Alexandre Gramfort <gramfort at nmr.mgh.harvard.edu>:
>> hi Denis,
>>
>>> I wonder whether there is a MNE-way of removing power-chor artifacts
>>> from wide-band MEG data (1-200 Hz).
>>
>> you mean the AC current and the harmonics of 50 or 60Hz?
>
> yes.
>
>>
>>> As there does not seem to be a notch filter available, empty room SSPs
>>> might be the way to do it.
>>
>> yes don't use SSP for this.
>>
>
> ok, thanks though
>
>> You need a notch like filter but I am not aware of any with mne or
>> mne-python.
>>
>> Alex
>>
>>
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