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Performance Limitations of Acoustic Echo Cancellers for Handsfree Telephony

By A. N. Birkett and R. A. Goubran


This paper examines the limitations of acoustic echo cancellers which are commonly used in hands-free full-duplex telephones. The various factors affecting the performance of echo cancellers in terms of achievable steady-state echo cancellation and convergence characteristics are discussed. New techniques which can overcome these limitations are proposed, and evaluated using field test data acquired from com-mercial hands-free telephones in different rooms. Full-duplex hands-free telephony is achieved by using an adaptive acoustic echo canceller (AEC) to model the transfer function between the loudspeaker and microphone. This way it is possible to estimate the echo at the microphone and subtract it from the transmitted signal. In an ideal environment with a perfectly lin-ear loudspeaker, a vibration-free telephone, no background or circuit noise, and a static anechoic chamber

Topics: Indexing Terms, Acoustics, Echo Cancellers, Adaptive Filters, DSP, Room Acoustics
Year: 2009
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