9.1.1 Echo Cancelation in Communications Echo canceler From talker A Hybrid B Speech Talker Echo from B B To talker A replica D Echo from 4 The adaptive filter attempts to estimate the path from C to D and then generate an echo replica for noise cancellation. In this way,the talkers can quarrel if they want t0. FIGURE 9.3 Principle of echo cancelation 9.1.1 Echo Cancelation in Communications FIGURE 9.3 Principle of echo cancelation The adaptive filter attempts to estimate the path from C to D and then generate an echo replica for noise cancellation. In this way, the talkers can quarrel if they want to