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<p class="MsoNormal" style="text-align:justify">Hello,<o:p></o:p></p>
<p class="MsoNormal" style="text-align:justify"><o:p> </o:p></p>
<p class="MsoNormal" style="text-align:justify">I’ve been looking for some clarification on the normalisation and scaling applied in ft_freqanalysis through the subfunctions like ‘ft_specest_mtmfft’. I have not been able to find specific explanations of these
transformations and their application to EEG online, are there any known readings/explanations available?<o:p></o:p></p>
<p class="MsoNormal" style="text-align:justify"><o:p> </o:p></p>
<p class="MsoNormal" style="text-align:justify">I am hoping to determine:<o:p></o:p></p>
<p class="MsoNormal" style="text-align:justify"><o:p> </o:p></p>
<ol style="margin-top:0cm" start="1" type="1">
<li class="MsoListParagraph" style="margin-left:0cm;text-align:justify;mso-list:l0 level1 lfo3">
Why the taper is normalised like this: <b>tap = tap./norm(tap, 'fro');</b> (e.g., in ft_specest_mtmfft [line 221])<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0cm;text-align:justify;mso-list:l0 level1 lfo3">
Why the FFT output is scaled like this: <b>dum = dum .* sqrt(2 ./ endnsample); </b>
(e.g., in ft_specest_mtmfft [line 277])<o:p></o:p></li></ol>
<p class="MsoNormal" style="text-align:justify"><o:p> </o:p></p>
<p class="MsoNormal" style="text-align:justify">I can see this same question was asked some time ago, but no further details were added to this thread. If anyone can clarify these transformations it would be much appreciated!<o:p></o:p></p>
<p class="MsoNormal" style="text-align:justify"><o:p> </o:p></p>
<p class="MsoNormal" style="text-align:justify">Cheers,<o:p></o:p></p>
<p class="MsoNormal" style="text-align:justify"><o:p> </o:p></p>
<p class="MsoNormal" style="text-align:justify"><span style="mso-fareast-language:EN-AU">Jack Fogarty<o:p></o:p></span></p>
<p class="MsoNormal" style="text-align:justify"><span style="mso-fareast-language:EN-AU">PhD Student<o:p></o:p></span></p>
<p class="MsoNormal" style="text-align:justify"><span style="mso-fareast-language:EN-AU"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-align:justify"><span style="mso-fareast-language:EN-AU">T: +61 4221 5547 | E:
<a href="mailto:jf752@uowmail.edu.au">jf752@uowmail.edu.au</a><o:p></o:p></span></p>
<p class="MsoNormal" style="text-align:justify"><span style="mso-fareast-language:EN-AU"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-align:justify"><span style="mso-fareast-language:EN-AU">Brain & Behaviour Research Institute<o:p></o:p></span></p>
<p class="MsoNormal" style="text-align:justify"><span style="mso-fareast-language:EN-AU">Psychophysiology Lab | School of Psychology | University of Wollongong<o:p></o:p></span></p>
<p class="MsoNormal" style="text-align:justify"><span style="mso-fareast-language:EN-AU"><img border="0" width="91" height="47" style="width:.95in;height:.4916in" id="Picture_x0020_3" src="cid:image001.png@01D70F45.E786A500"><img border="0" width="135" height="43" style="width:1.4083in;height:.45in" id="Picture_x0020_2" src="cid:image002.png@01D70F45.E786A500" alt="UOW shield bl"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-align:justify"><o:p> </o:p></p>
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