[Mne_analysis] 50Hz artefact for time frequency analysis {Disarmed}

[David Leitman]

HI Alejandro,
 

Thank you for responding, and please forgive my signal processing ignorance in my following reply.

 I read the comment below realize that this would be true for zeroing out this frequency but could I not replace the existing 60HZ coefficient  with lets say the average power values of the59hz and 61Hz and reconstitute the wave without a heaving ringing?

Also say the data is decomposed using 1Hz frequency bins , but in the end I will only need to conduct time-frequncy analysis and 2Hz resolution, can i not spectral decompose the data at 1Hz and  reconstitute it just using a 2Hz bin resolution?

thanks david
David I. Leitman PhD
 
Visiting Scientist,
PSYR2 - Psychiatric disorders: from Resistance to Response
Centre de Recherche en Neurosciences de Lyon (CRNL) INSERM-CNRS
 
E. david.leitman at ext.inserm.fr
Web.   davidileitman.com



> On Oct 6, 2017, at 3:30 PM, Alejandro Weinstein <alejandro.weinstein at gmail.com> wrote:
> 
>> My question is as follows: 1)is there a good reason not to try this approach
> 
> The reason for not to try  this approach is that what your are
> proposing is equivalent to applying a brick wall filter. This will
> cause a lot of ringing.
> 
> See this link for more details:
> 
> https://dsp.stackexchange.com/questions/6220/why-is-it-a-bad-idea-to-filter-by-zeroing-out-fft-bins
> 
> Alejandro
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