A subband acoustic echo cancellation coupled with double talk detector

A subband adaptive algorithm coupled with double talk detector is proposed for acoustic echo cancellation in communication systems. Through frequency decomposition technique and conjugate gradient algorithm, adaptive filters operate in each decimated subband. Coupled with a double-talk detector based on an angle measure between two vectors comprising samples of input signal to the near-end microphone and the estimated echo at the output of the adaptive filter, the adaptive filter can freeze adaptation during the double talk periods immediately to avoid divergence. The proposed algorithm can ensure convergence with high speed and reduce computational complexity. Simulation results indicate that the algorithm demonstrates good performance for acoustic echo cancellation in communication systems, even with the disturbance of the double talk.