Wideband acoustic echo cancellation apparatus with adaptive tail length in embedded system, and wideband acoustic echo cancellation method

A wideband acoustic echo cancellation method, comprising:

• calculating a delay length of an echo path, using a near-end signal and a far-end signal;
• implementing an adaptive filter based on the calculated delay length, using selected coefficients;
• searching for three intervals having a largest impulse response value from all intervals of a tail of the adaptive filter;
• calculating an error in the three intervals during an interval in which the selected coefficients are used;
• verifying an influence of a result of an operation of the three intervals on a ratio of an energy of the near-end signal and a signal energy of the error, when the adaptive filter reaches a convergence;
• storing a corresponding adaptive filter coefficient in an internal memory, and disabling an operation of the adaptive filter, when the verified influence is equal to or less than a threshold;
• and
• estimating a condition to change a length of the tail, and changing the length of the tail, based on the estimated condition.