Telephonic communications – Subscriber line or transmission line interface – Network interface device
Patent
1998-02-27
2000-10-24
Dorvil, Richemond
Telephonic communications
Subscriber line or transmission line interface
Network interface device
379406, 455570, H04M 100
Patent
active
06137881&
ABSTRACT:
This invention is a method and apparatus for acoustic echo cancellation. The acoustic echo cancellation employs a modified fast affine projection filter algorithm. The projection order of the affine projection filter algorithm is selected to be small relative to the delay parameter of the transversal filter. This selection of the projection order permits a simplifying approximation in the auto-correlation matrix (the simplified matrix is called a Toeplitz matrix) of the fast affine projection filter algorithm. This simplifying approximation reduces the computational complexity of the filter algorithm without great adverse change in the convergence rate or in the residual. This modified fast affine projection filter algorithm may be practiced on a programmed digital signal processor.
REFERENCES:
patent: 5272695 (1993-12-01), Makino et al.
patent: 5848105 (1998-12-01), Gardner et al.
Makino et al.; Acoustic Echo Canceller Algorithm Based on the Variation Characteristics of a Room Impulse Respons; IEEE; pp. 1133-1136, 1990.
Tanaka et al.; Fast Projection Algorithm and Its step Size Control; IEEE; pp. 945-948, 1995.
Liu et al.; On the Use of a Modified Fast Affine Projection Algorithm in Subbands for Acoustic Echo Cancelation; IEEE; pp. 354-357, 1996.
Makino et al.; SSB Subband Echo Canceller Using Low-Order Projection Algorithm; IEEE; pp. 945-948, 1996.
Reed et al.; Acoustic Echo Cancellation with the Fast Affine Projection; University of Essex; IEEE; pp. 16/1-16/8, 1998.
Been Rabaa et al.; Acoustic Echo Cancellation based on a Recurrent Neural Network and a Fast Affine Projection Algorithm; IEEE; pp. 1754-1755, 1998.
Muneyasu et al.; A New 2-D Adaptive Filter Using Affine Projection Algorithm; IEEE; pp. V-92 to V-93, 1998.
Tanaka et al.; A Block Exact Fast Affine Projection Algorithm; IEEE; pp. 79-86, 1999.
Yutaka Kaneda et al., "An Adaptive Algorithm with Fast Convergence for Multi-Input Sound Control," Active 95, pp. 993-1004, Jul. 6-8, 1995.
Steven L. Gay et al., "The Fast Affine Projection Algorithm," IEEE, pp. 3023-3026, 1995.
Kazuhiko Ozeki et al., "An Adaptive Filtering Algorithm Using an Orthogonal Projection to an Affine Subspace and Its Properties," Electronic and Communications in Japan, vol. 67-A, No. 5, pp. 19-27, 1984.
Ali Murtaza
Linebarger Darel
Oh Stephen S.
Azad Abul K.
Brady III W. James
Dorvil Richemond
Marshall, Jr. Robert D.
Telecky Jr. Frederick J.
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