A MULTIRATE ACOUSTIC ECHO CANCELER STRUCTURE

A new subband echo canceler (SBEC) structure is proposed to reduce the transmission delay introduced by conventional SBEC structures, withou t distorting the near-end signal, The proposed structure is based on c omputing two output errors, one for using during single-talk and the o ther one for using during double-talk periods, With the SBEC structure we propose a double-talk detector with a subband configuration which allows a fast and accurate detection of double-talk periods, enabling the SBEC algorithm to track changes in the echo path impulse response when the near-end signal is absent, Computer simulations using actual speech signals, and subjective evaluation tests are given to show the convergence performance, tracking and double-talk detection ability, o f the proposed scheme.