Multichannel acoustic cancellation problem requires working with extremely large impulse responses. Multirate adaptive schemes such as the partitioned block frequency-domain adaptive filter (PBFDAF) are good alternatives and are widely used in commercial echo cancellation systems nowadays. However, being a Least Mean Square (LMS) derived algorithm, the convergence speed may not be fast enough under some circumstances. In this paper we propose a new scheme which combines frequency-domain adaptive filtering with conjugate gradient techniques in order to speed up the convergence time. The new algorithm (PBFDAF-CG) is developed and its behavior is compared against previous PBFDAF schemes.

Authors: Beracoechea, Jon Ander; Casajús-Quirós, Francisco Javier; García Morales, Lino; Torres-Guijarro, Soledad
Affiliations: escuela técnica superior de ingenieros de telecomunicación; universidad politécnica de madrid; universidad europea de madrid(See document for exact affiliation information.)
AES Convention: 120 (May 2006) Paper Number: 6713
Publication Date: May 1, 2006
Subject: Multichannel Sound

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