Acoustic Echo Cancellers (AECs) are voice-operated devices which eliminate acoustic echoes and protect the communication from howling due to acoustic feedback from loudspeaker to microphone. AECs are placed in audio terminals on the customer premises.
Many applications, such as full duplex speaker phones and mobile telephones, require high performance AECs. In a speaker-microphone system, a part of the speaker output gets picked up by the microphone, either directly or indirectly, causing annoying echoes heard by the far-end telephone user. Acoustic echo cancellers circumvent these echoes.
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