ECHO ERASE DEVICE

摘要

A state judgment unit (2) judges that a double talk is present when a reception signal and a transmission signal have a sound, a reduction amount of an echo erase amount per a predetermined time expressed by a level difference between the transmission signal and a residual signal subjected to echo erase by an adaptive filter (1) exceeds a predetermined threshold value, and a change amount of the signal level of the reception signal is not greater than a predetermined reference.