Delay coefficients based variable step size algorithm for subband affine projection adaptive filters

IEICE Electronics Express

Sapna George¹  Kwok Hung Li³  Karthik Muralidhar¹  Anoop Kumar Krishna² 

[1] STMicroelectronics Asia pacific Pte. Ltd.;EADS Singapore Pte. Ltd.;Nanyang Technological University

关键词: subband affine projection;    variable step size;    delay coefficients;   

DOI  :  10.1587/elex.6.20

学科分类：电子、光学、磁材料

来源: Denshi Jouhou Tsuushin Gakkai

【 摘 要 】

References(5)Cited-By(2)Subband adaptive filters are preferred in acoustic echo cancellation systems with long echo tail lengths due to speed of convergence and complexity savings. Recently, a new and novel subband affine projection (SAP) algorithm was reported based on the polyphase decomposition of the adaptive filter and noble identities. For good system performance it is important to have a good variable step size (VSS) algorithm as part of an adaptive filter. In this paper, based on the method of delay coefficients (DC), we propose1 a VSS algorithm for the SAP adaptive filter, which is called as delay coefficients based variable step size subband affine projection algorithm (DC-VSS-SAP). We examine in detail the similarities and differences between DC method for the subband and fullband scenarios. Further, we show how the method of DC can be used to detect changes in echo paths and speed up convergence of the adaptive filter.

【 授权许可】

Unknown