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<div class="moz-cite-prefix">On 9/9/2014 11:20 PM, Erik Anderson
wrote:<br>
<br>
</div>
<blockquote
cite="mid:CAAeZAZ4yccQjuv-uLiMkwf1-2MEFwLE1c1jXmtr5DokgEH=oRQ@mail.gmail.com"
type="cite"><i>To take an extreme example, someone talking for
5sec is not going to show up well after an FFT (the voice
frequencies are too transient to show up in the average) and the
resulting frequency information does not carry enough data to be
able to reproduce the contents of the speech in an iFFT
operation.</i></blockquote>
<br>
This can easily be checked with Matlab... digitize your 5-second
speech with one of the many programs that allow to do that,
producing a WAV file, then import that WAV file into Matlab, compute
an FFT of it, do an inverse FFT, then playback the resulting data.
If your digitization respected the Nyquist criterion, what you will
hear is indistinguishable from the playback of the original WAV
file.<br>
<br>
<div class="moz-signature">-- <br>
<i><b>73 Alberto I2PHD</b><br>
<small>Credo Ut Intelligam<br>
<br>
<br>
<br>
</small></i></div>
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