Sorry nobody responded on this earlier, but for some reason it just came into my inbox this morning.<div><br></div><div>Briefly, no, you don't have to convert the samples to the frequency domain before submitting them to the echo canceller. The Speex AEC will automatically convert them to the frequency domain as part of its processing, and will then convert them back after they've been cancelled. If you look at the testecho.c file, you can see how it should be done: it's assuming two inputs, one a raw (time domain) signal sent to the speakers, the other a raw (time domain) signal received from the microphone.</div>
<br>Ken Smith<br>Cell: 425-443-2359<br>Email: <a href="mailto:ken@alanta.com" target="_blank">ken@alanta.com</a><br>Blog: <a href="http://blog.wouldbetheologian.com/" target="_blank">http://blog.wouldbetheologian.com/</a><br>
<br><br><div class="gmail_quote">On Thu, Nov 4, 2010 at 10:12 AM, Alexandre Bento Leal <span dir="ltr"><<a href="mailto:msbleal@gmail.com">msbleal@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
Hello.<br>I'm from Federal University of Rio Grande do Sul - Brazil and I'm trying to <span lang="en"><span style="color:rgb(0, 0, 0)" title="">adapt speex_echo.h (speex-1.2beta3-win32)</span></span> to our video-conference software code. <br>
We are working on amplitude values, but I realised that in order to AEC
works, one has to convert amplitude to frequency and filter the echo
frequencies. So, my question is:<br><br>Do I have to manually convert
amplitude samples to frequency samples or is it enough to send amplitude
parameters to speex_echo.h functions that this functions automatically
convert it and do the AEC?<br>
<br>Thanks for your attention.<br><font color="#888888"> <br>-- <br>Alexandre Bento Leal <br>
<br>
Graduando em Engenharia de Computação - UFRGS<br>
Membro PRAV - Projetos em Áudio e Vídeo<div style="display:inline"></div><br>
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