[Speex-dev] AEC Troubles

[mrywhh]

Hello！
I am a new user of speex.I am currently working on speex frames and I have some questions.
I am using narrowband and long tail length, and it works very well with speex test DEMO. But it is very difficult to have speaker input in perfect sync with mic input. Speex does not work at all. 
 
Any suggestion?
 
Regards！
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