H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 3/23 (2006.01) H04M 9/08 (2006.01)
Patent
CA 2048634
2048634 9111060 PCTABS00006 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).
Petersen Kim T.
Thrane Morten
Gowling Lafleur Henderson Llp
Motorola Inc.
Petersen Kim T.
Thrane Morten
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