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<p>Hi Dan,</p>
<p>think of short term fft as windowing with a rectangular window.
This has rather bad frequency resolution (wide central lobe, many
side lobes in the amplitude spectrum). It produces "veridical"
values for the amplitude estimate over the analysis interval
(your window length)</p>
<p>The other methods underestimate the amplitudes systematically. If
you are only interested in relative amplitudes (most cases) that
doesn't matter. <br>
</p>
<p>The Hanning window improves the cross talk and is typically
applied once the whole intervall and then an FFT is calculated to
get the amplitude spectrum. The cost for that improvement is that
the amplitude estimate are biased towards the center of the window
and the amplitude values are underestimated. <br>
</p>
<p>Multitaper analysis applies multiple orthogonal windows and
obtains by that approach multilple amplitude spectra, which are
then combined for the final estimate. Approach reduces the noise
in the amplitude spectrum lets you trade-off frequency
resolution against noise. <br>
</p>
<p>When you write multiple sliding windows you likely refer to the
Welch method which applies multiple shorter and partly overlapping
tapers to the analysis interval and then combines those correlated
amplitude estimates. This method reduces the noise in the
amplitude spectrum. In principle, you could use different types of
windows.</p>
<p>Hope that helps, <br>
</p>
<p> Jochem<br>
</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 27.07.23 18:43, Weisholtz, Daniel
S.,MD via fieldtrip wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CE517B4B-9C3A-4EDE-98E8-685CAF1BB50A@partners.org">
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<div><span style="font-size: 14px;" class="">Dear FieldTrip
community,</span>
<div class=""><span style="font-size: 14px;" class=""><br
class="">
</span></div>
<div class=""><span style="font-size: 14px;" class="">I
understand that using the hanning window with this function
will make this function use a single sliding taper window
rather than multitaper. Does that make this analysis
equivalent to a short-time fft analysis? If you do this,
will FieldTrip ignore the <span style="caret-color: rgb(33,
37, 41); color: rgb(33, 37, 41); background-color:
rgb(255, 255, 255);" class="">tapsmofrq parameter?</span></span></div>
<div class=""><span style="caret-color: rgb(33, 37, 41); color:
rgb(33, 37, 41); background-color: rgb(255, 255, 255);
font-size: 14px;" class=""><br class="">
</span></div>
<div class=""><span style="caret-color: rgb(33, 37, 41); color:
rgb(33, 37, 41); background-color: rgb(255, 255, 255);
font-size: 14px;" class="">Thanks for your help!</span></div>
<div class=""><span style="caret-color: rgb(33, 37, 41); color:
rgb(33, 37, 41); background-color: rgb(255, 255, 255);
font-size: 14px;" class=""><br class="">
</span></div>
<div class=""><span style="caret-color: rgb(33, 37, 41); color:
rgb(33, 37, 41); background-color: rgb(255, 255, 255);
font-size: 14px;" class="">Best,</span></div>
<div class=""><span style="caret-color: rgb(33, 37, 41); color:
rgb(33, 37, 41); background-color: rgb(255, 255, 255);
font-size: 14px;" class="">Dan</span></div>
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<pre class="moz-signature" cols="72">--
Jochem Rieger
Prof. Dr. rer. nat. habil.
Applied Neurocognitive Psychology
DFG Center for Open and Reproducible Neuroscience Tools
NFDI sections ELSA and metadata
Carl-von-Ossietzky University Oldenburg
Phone: +49 (0)441 798 4533
Web: <a class="moz-txt-link-freetext" href="https://urldefense.com/v3/__https://uol.de/en/applied-neurocognitive-psychology__;!!HJOPV4FYYWzcc1jazlU!-UMNRq4rK2lyaAG8yIA6-u8wPh3_Ic4bONsCzmSVBYJvI7KL-OF49B7YMouv8_fdUNpmkV9OETzEF9L3eX1WFqiwLBLSsuSroRqJ$">https://uol.de/en/applied-neurocognitive-psychology</a>
github: <a class="moz-txt-link-freetext" href="https://urldefense.com/v3/__https://github.com/ANCPLabOldenburg__;!!HJOPV4FYYWzcc1jazlU!-UMNRq4rK2lyaAG8yIA6-u8wPh3_Ic4bONsCzmSVBYJvI7KL-OF49B7YMouv8_fdUNpmkV9OETzEF9L3eX1WFqiwLBLSsvYGzS6g$">https://github.com/ANCPLabOldenburg</a>
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