Hi, I am using speex 1.2 beta3 version for AEC. But result of AEC is very poor. It decreases the gain of resultant signal and observed significant amount of echo in the result. I have set following parameters. #define NN 160 #define TAIL 2400 #define SAMPLE_RATE 8000 Does this version supports NLP functionality? Please guide me, if any tuning is required. Thanks, Meenakshi -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.xiph.org/pipermail/speex-dev/attachments/20090323/92531200/attachment.htm