Dual mode cellular radio communication apparatus having an...

Details Dual mode cellular radio communication apparatus having an... Dual mode cellular radio communication apparatus having an...

H - Electricity

04

B

H04B 7/26 (2006.01) H04B 1/40 (2006.01) H04M 9/08 (2006.01) H04Q 7/20 (2006.01)

Patent

CA 2056516

A dual mode cellular radio communication apparatus includes an echo canceller which cancels echo signals caused by acoustic coupling between a hands-free microphone and a loudspeaker in both analog mode and digital modes. An analog-to-digital converter and digital-to-analog converter may be used both in an analog mode and in a digital mode. A second analog-to-digital converter and a second digital-to-analog converter may be selectively used in the analog or digital mode. The echo canceller may be rendered inoperative during hand-set operation. In addition, a bypass circuit may be provided between an input and an output of the echo canceller so that the echo canceller is bypassed.

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