NDLI: Post-Filtering for Residual ECHO Suppression in Under-Modeled Acoustic ECHO Cancellers

Content Provider	IEEE Xplore Digital Library
Author	Gordy, J.D. Goubran, R.A.
Copyright Year	2006
Description	Author affiliation: Dept. of Syst. & Comput. Eng., Carleton Univ., Ottawa, Ont. (Gordy, J.D.; Goubran, R.A.)
Abstract	This paper investigates the use of post-filtering algorithms for suppressing residual echo in adaptive acoustic echo cancellers, which is an important component of hands-free telephone systems. The goal of post-filtering is to enhance near-end speech corrupted by residual echo due to echo canceller under-modeling. In this paper the use of signal subspace enhancement is investigated as a post-filter structure by employing a subspace decomposition of the echo canceller error signal using the Karhunen-Loeve transform (KLT). In particular, the spectral-domain constrained (SDC) linear estimator is employed to enhance the near-end speech subspace while suppressing the residual echo subspace. Practical and low-complexity implementation considerations are discussed. Simulation results are presented comparing the approach to frequency-domain post-filtering in terms of objective near-end speech distortion and quality measures
Starting Page	1184
Ending Page	1187
File Size	4793947
Page Count	4
File Format	PDF
ISBN	1424400384
DOI	10.1109/CCECE.2006.277388
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-05-07
Publisher Place	Canada
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Echo cancellers Speech enhancement Telephony Psychoacoustic models Microphones Filtering algorithms Noise cancellation Karhunen-Loeve transforms Acoustic distortion Nonlinear distortion signal subspace enhancement Acoustic echo cancellation residual echo suppression post-filtering
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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