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...e similar speech in near end speech and eliminate it. In case 1: Because the there is no echo in near end speech, and the EC module still works on it. So a inverse model is been calculated, and a inverse signal is produced. In this way , you can hear the far end speech. In case 2: Is the NES is produeced by FES? Maybe EC can not recognise the speech as human been just because it is similar. If you want to check the EC, I think you should prepare a echo path model (you can find some typical models on G.168 ). You get a echo signal when the model applied on FES. Once you want a signle talk t...