Title: Design and implementation of a hybrid sub-band acoustic echo canceller (AEC)
Authors: Bai, Mingsian R.
Yang, Cheng-Ken
Hur, Ker-Nan
機械工程學系
Department of Mechanical Engineering
Issue Date: 10-Apr-2009
Abstract: An efficient method is presented for implementing an acoustic echo canceller (AEC) that makes use of hybrid sub-band approach. The hybrid system is comprised of a fixed processor and an adaptive filter in each sub-band. The AEC aims at reducing the echo resulting from the acoustic feedback in loudspeaker-endosure-microphone (LEM) systems such as teleconferencing and hands-free systems. In order to cancel the acoustical echo efficiently, various processing architectures including fixed filters, hybrid processors, and sub-band structure are investigated. A double-talk detector is incorporated into the proposed AEC to prevent the adaptive filter from diverging in double-talk situations. A de-correlation filter is also used alongside sub-band processing in order to enhance the performance and efficiency of AEC. All algorithms are implemented and verified on the platform of a fixed-point digital signal processor (DSP). The AECs are evaluated in terms of cancellation performance and computation complexity. In addition, listening tests are conducted to assess the subjective performance of the AECs. From the results, the proposed hybrid sub-band AEC was found to be the most effective among all methods in terms of echo reduction and timbral quality. (C) 2008 Elsevier Ltd. All rights reserved.
URI: http://dx.doi.org/10.1016/j.jsv.2008.09.053
http://hdl.handle.net/11536/7372
ISSN: 0022-460X
DOI: 10.1016/j.jsv.2008.09.053
Journal: JOURNAL OF SOUND AND VIBRATION
Volume: 321
Issue: 3-5
Begin Page: 1069
End Page: 1089
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