Asymmetric multichannel filter

Details Asymmetric multichannel filter Asymmetric multichannel filter

2005-04-26

2005-04-26

Isen, Forester W. (Department: 2644)

Electrical audio signal processing systems and devices

Dereverberators

C381S092000, C381S119000, C381S071100

Reexamination Certificate

active

06885750

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). The asymmetric multi-channel filter combines a good convergence behavior with a low memory usage and can, for example, be used advantageously in multi-channel echo and noise cancellers.

REFERENCES:
patent: 4829378 (1989-05-01), LeGall
patent: 5793875 (1998-08-01), Lehr et al.
patent: 6449586 (2002-09-01), Hoshuyana
patent: 10052838 (2000-11-01), None

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