WinMM audio interface is not very synchronized, and requires quite a bit of tinkering to get any sort of echo cancellation working with it.<div><div>Many people on this list have recommended using DirectSound instead.</div>
<div>Search through the list archive and you'll see recommendations.</div><div><br><div class="gmail_quote">On Fri, Oct 16, 2009 at 4:47 PM, Eugene Leviant <span dir="ltr"><<a href="mailto:evgeny.leviant@gmail.com">evgeny.leviant@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">I'm using Speex in Windows VoIP application and trying to implement echo cancellation<div>I'm using waveInXXXX and waveOutXXXX API. I'm doing quite simple thing:</div>
<div><br></div><div>After buffer is played (I get MM_WOM_DONE message) I'm just copying it's content to temporary playback buffer </div>
<div>After buffer is recorded (I get MM_WIM_DONE message) I call speex_echo_cancellation(state, recorded_buf, playback_buf, out);</div><div><br></div><div>Access to playback buffer is synchronized, so it is not being read and filled at the same time.</div>
<div>I'm using the same soundcard for both recording and playback</div><div><br></div><div>Speex doesn't seem to cancel any echo at all. My frame size is 20 msec long (640 samples, ultra-wideband), Filter length is</div>
<div>10 frames (6400 samples). I beleive that I correctly initialize the speex echo state (sample rate value is being set in speex_echo_ctl, also speex echo state is registered withing preprocessor state).</div><div><br>
</div>
<div>Please help someone, or at least send a piece of code which works.</div><div>Any help would be appreciated.</div><div><br></div><div><br></div>
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