Acoustic Echo Cancellation for Natural Speech Communication at the Human-machine Interface

For hands-free, untethered full-duplex speech communication at the human-machine interface, the acoustic feedback from the loudspeaker(s) to the microphone(s) has to be suppressed. Following the analysis of the problem, the basic concept of acoustic echo cancellation is reviewed. Typical adaptation algorithms are discussed and adaptation control as well as computationally efficient filtering schemes are addressed. Moreover, properties and problems of extensions to multi-channel signal acquisition using microphone arrays, and to multi-channel sound reproduction are outlined.