Speaking apparatus having handfree conversation function

Details Speaking apparatus having handfree conversation function Speaking apparatus having handfree conversation function

H - Electricity

04

M

H04M 1/60 (2006.01) H04M 9/08 (2006.01)

Patent

CA 2056455

A speaking apparatus having a handfree conversation function, provided with an echo canceler (3) which can cancel the echo given by direct acoustic coupling between a speaker and a microphone caused by a system comprised of a casing and the ground surface and a speech switching circuit (6) wherein the amount of insertion attenuation of the transmitted and received signal is set with an upper limit of the amount of attenuation sufficient for canclling the echo given by the indirect acoustic coupling determined from the state of the space in which the speaking apparatus is used and wherein the echo canceler (3) and the speech switching circuit (6) are given the optimum functions to share so as to obtain an excellent speaking quality with an inexpensive and small sized processing circuit.

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