<div dir="ltr"><div><span style="color:rgb(0,0,0);font-family:'Times New Roman';font-size:medium">Hi,</span></div><div><span style="color:rgb(0,0,0);font-family:'Times New Roman';font-size:medium"><br></span></div>
<div><span style="color:rgb(0,0,0);font-family:'Times New Roman';font-size:medium">I have a question regarding the viability of using Speex on the Windows Phone 8. The constraints of my project have led me to use the Windows Audio Session API (WASAPI) for the capturing and rendering of audio. It works pretty dang well, except for the fact that there is no AEC unit. Hence my use of your library. I've been able to get some pretty good echo cancellation, but there are large discrepancies in the audio between uses of the application. Sometimes there is no echo, sometimes there is full echo. Sometimes the echo will fade in and out. Now, I read this on your troubleshooting section:</span></div>
<div><span style="color:rgb(0,0,0);font-family:'Times New Roman';font-size:medium"><br></span></div><div><span style="color:rgb(0,0,0);font-family:'Times New Roman';font-size:medium">"Using a different soundcard to do the capture and plaback will *not* work, regardless of what you may think. The only exception to that is if the two cards can be made to have their sampling clock ``locked'' on the same clock source."</span><br>
</div><div><span style="color:rgb(0,0,0);font-family:'Times New Roman';font-size:medium"><br></span></div><div><span style="color:rgb(0,0,0);font-family:'Times New Roman';font-size:medium">I've also come to realize that there can be a slight clock drift between the microphone and speakers on the Windows Phone. Does this mean what I think it does? Will I have to find another API for audio playback/capture or for echo cancellation? I know there are applications on the Windows Phone that have great echo cancellation, but its frustrating that they don't extend those APIs to the public.</span></div>
<div><span style="color:rgb(0,0,0);font-family:'Times New Roman';font-size:medium"><br></span></div><div><span style="color:rgb(0,0,0);font-family:'Times New Roman';font-size:medium">Thanks,</span></div><div>
<span style="color:rgb(0,0,0);font-family:'Times New Roman';font-size:medium"><br></span></div><div><span style="color:rgb(0,0,0);font-family:'Times New Roman';font-size:medium">Jim</span></div>-- <br><div dir="ltr">
<b>Jim Brock</b><div>Software Engineer</div><div><a href="mailto:james.brock@8x8.com" target="_blank">james.brock@8x8.com</a><br></div><div><br></div><div>8x8, Inc.</div><div>2125 O'Nel Drive</div><div>San Jose, CA 95126</div>
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