Title:
ECHO CANCELLER
Document Type and Number:
WIPO Patent Application WO/1991/011060
Kind Code:
A1
Abstract:
This invention relates to an echo canceller such as for use in a full duplex hands free radio. The echo canceller is particularly suitable for use in a vehicle fitted with a microphone and a loudspeaker, for cancelling echos reach the radio microphone (16) from the radio loudspeaker (13). The signal paths are divided into sub-band channels (Y1-YM). Each of the channels has an adaptive filter (24, 29, 30), a time delay coefficient of which is dynamically adjustable. Means are provided for cancelling echos by compensating the signal on each channel as a function of the signal from the filter, and means (S1, Si, SM) are provided for initiating and suspending the adjustment of the coefficient of each channel filter as a function of the signal on that channel (X1-XM and/or Y1-YM).
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Inventors:
THRANE MORTEN (DK)
PETERSEN KIM TILGAARD (DK)
PETERSEN KIM TILGAARD (DK)
Application Number:
PCT/EP1990/002264
Publication Date:
July 25, 1991
Filing Date:
December 21, 1990
Export Citation:
Assignee:
MOTOROLA INC (US)
International Classes:
H04M9/08; (IPC1-7): H04B3/23; H04M9/08
Foreign References:
| EP0333581A1 | 1989-09-20 | |||
| EP0301627B1 | 1993-04-14 | |||
| EP0107122A1 | 1984-05-02 | |||
| US4578543A | 1986-03-25 | |||
| EP0282393A1 | 1988-09-14 |
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