Single-Channel Acoustic Echo Cancellation

This chapter explains the problem of acoustical echoes and their cancellation. It focuses on the hands-free telephone as one of the major applications for echo cancelling devices. Beginning with a brief discussion of a system formed by a loudspeaker and a microphone located within the same enclosure, the properties of speech signals and noise are described. The major part of the echo can be cancelled by an adaptive filter connected in parallel to the loudspeaker and the microphone. Residual echoes may be suppressed by an additional filter within the outgoing signal path. We will address only single-channel solutions, which means that we will have a monophonic loudspeaker signal.

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