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Document CN000001608351A (Pages: 15)

Bibliographic data Document CN000001608351A (Pages: 15)
INID Criterion Field Contents
54 Title TI [EN] Device and method for carrying out multichannel acoustic echo cancellation with a variable number of channels
71/73 Applicant/owner PA GRUNDIG AG, NL
72 Inventor IN HERBERT BUCHNER, NL ; WALTER KELLERMANN, NL
22/96 Application date AD Oct 25, 2002
21 Application number AN 02826134
Country of application AC CN
Publication date PUB Apr 20, 2005
33
31
32
Priority data PRC
PRN
PRD
DE
10153188
20011027
51 IPC main class ICM H04B 3/23
51 IPC secondary class ICS H04M 9/08
H04R 3/12
IPC additional class ICA
IPC index class ICI
Cooperative patent classification CPC H04M 9/082
H04R 27/00
H04R 3/02
MCD main class MCM
MCD secondary class MCS H04B 3/23 (2006.01)
H04M 9/08 (2006.01)
H04R 3/02 (2006.01)
MCD additional class MCA
57 Abstract AB [EN] A multichannel full-duplex audio signal transmission system, comprising an adaptive filter ( 2 ) provided for multichannel acoustic echo cancellation. A channel combining device ( 5 ) is provided between the preprocessing units (V 1 , . . . VD) and loudspeakers (L 1 , . . . ,LD), in which several (C>D) loudspeakers can be connected to one and the same preprocessing unit and by means of which the remaining D-C preprocessing units can be separated from the loudspeakers (L 1 , . . , LD). The channel combining device permits an optimization of the convergence ratio of the adaptive adjustment of filter coefficients in said adaptive filter ( 2 ).
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