Partitioned block frequency domain adaptive filter

Details Partitioned block frequency domain adaptive filter Partitioned block frequency domain adaptive filter

2007-01-30

2007-01-30

Ngo, Chuong D (Department: 2193)

Electrical computers: arithmetic processing and calculating

Electrical digital calculating computer

Particular function performed

Reexamination Certificate

active

09930679

ABSTRACT:
The partitioned block frequency domain adaptive filter according to the invention comprises a plurality of parallel arranged filter partitions. Each filter partition models a part of an impulse response of the adaptive filter and has update means for updating filter coefficients of that filter partition by means of a circular convolution. The update means intermittently constrain these filter coefficients by eliminating circular wrap-around artifacts of the circular convolution. The update means comprise selection means for selecting and removing at least part of the circular wrap-around artifacts. The selection means can be implemented with a relatively low computational complexity by means of an approximation of a rectangular constraint window.

REFERENCES:
patent: 4658426 (1987-04-01), Chabries et al.
patent: 5416845 (1995-05-01), Qun
patent: 5524149 (1996-06-01), Frenzel
patent: 5796814 (1998-08-01), Brajal et al.
patent: 5889869 (1999-03-01), Botros et al.
By J.S. Soo and K.K. Pang “Multidelay Block Frequency Domain Adaptive Filter”, IEEE Transactions on Acoustics, Speech and Signal Processing, vol. 38, No. 2, pp. 373-376.

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