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.

Abstract: The partitioned block frequency domain adaptive filter according to the invention includes a plurality of parallel arranged filter partitions. Each filter partition models a part of an impulse response of the adaptive filter and has update unit for updating filter coefficients of that filter partition by a circular convolution. The update unit intermittently constrain these filter coefficients by eliminating circular wrap-around artifacts of the circular convolution. The update unit is arranged for updating the filter coefficients in dependence on at least part of the circular wrap-around artifacts, resulting in an improved convergence behavior of the adaptive filter.

Abstract: Stereo echo cancellation is necessary to overcome the objections observed by, for example, teleconferencing, voice controlled video/audio apparatuses, etc. To improve the existing filters, an adaptive filter is used along with a signal processing device which obtain the coefficient updates in the transformed domain, reducing the required calculation complexity. Further, the filter includes circuitry for reducing the correlation between the input signals on the coefficient updates.

Abstract: A multi-channel filter (20) includes S inputs for receiving S input signals (x1 . . . xS) and at least S filters (14, 28) coupled to the S inputs for filtering the input signals (x1 . . . xS) or auxiliary signals (y1 . . . yS) derived therefrom. The multi-channel filter (20) further includes a signal combiner (16) for combining the filtered signals into an output signal (ê) and a further signal combiner (22) coupled in between at least part of the inputs and at least part of the filters (14, 28). The further signal combiner (22) is arranged for combining at least part of the input signals (x1 . . . xS) into at least one auxiliary signal (y1 . . . yS) The multi-channel filter (20) is asymmetric in that at least one of the filters (28) has a filter length which is substantially larger than the filter lengths of the other filters (14).

Abstract: Described is a multichannel filter (20) which comprises S inputs for receiving S input signals (x1 . . . xS) and at least S filters (14, 28) coupled to the S inputs for filtering the input signals (x1 . . . xS) or auxiliary signals (y1 . . . yS) derived therefrom. The multichannel filter (20) further comprises a signal combiner (16) for combining the filtered signals into an output signal (ê) and a further signal combiner (22) coupled in between at least part of the inputs and at least part of the filters (14, 28). The further signal combiner (22) is arranged for combining at least part of the input signals (x1 . . . xS) into at least one auxiliary signal (y1 . . . yS) The multichannel filter (20) is asymmetric in that at least one of the filters (28) has a filter length which is substantially larger than the filter lengths of the other filters (14).

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.

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 are arranged for updating the filter coefficients in dependence on at least part of the circular wrap-around artifacts of adjacent update means, resulting in an improved convergence behavior of the adaptive filter.