Subband doubletalk detector for acoustic echo cancellation systems

Though the subband adaptive filter has been studied for several years and is already widely used in real-time acoustic echo cancellation (AEC) systems, the study of the doubletalk detector in subband AEC has not been reported. Two subband doubletalk detectors are proposed and simulated. An objective measurement is also employed to quantify the performance of the subband doubletalk detectors in contrast with the fullband implementation. Simulation shows that the proposed subband doubletalk detectors can increase the probability of doubletalk detection by at least 3% over the traditional fullband implementation under the same false alarm probability.