Conversations in such scenarios would be very annoying and non-intelligible. The amount of delay defines how annoying the experience could be. Echo is the phenomenon where one hears his/her own voice after a certain delay. If the far-end speech gets transmitted back to the other side of the call, then the other person would hear their voice after some delay (network + processing delay). However, the microphones also capture the far-end speech due to the acoustic coupling of the loudspeaker and microphone. And your own voice, referred to as near-end speech, would be captured by the microphone and sent across the network to the other end of the call. The speech of the other person you are talking to, referred to as far-end speech, would be played out from the loudspeaker. Suppose you are in a voice call talking with someone over a speakerphone. Let's first understand what echo is in terms of voice communication. AEC is not only present in cellphones but also in all kinds of audio calling devices like Amazon’s Echo series and Facebook’s Portal devices. Echo cancellers aid for smooth and intelligible conversations in full-duplex voice communication. ![]() Research on Echo cancellers started in the 1960s, especially for voice communication devices. Acoustic Echo Canceller (AEC) plays an important role in voice communication systems.
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