In this paper, we propose a novel acoustic channel de-correlation method, which prevents from poor convergence in stereophonic echo cancellation. In order to minimize audio quality degradation while maximizing channel de-correlation, the proposed method provides a sub-band phase modification of each channel, which depends on the amount of inter-channel phase difference so that redundant phase alteration is avoided. In addition, we introduce a phase control parameter for each sub-band to preserve perceptual stereo image of each channel. The performances of the proposed method are verified with MUSHRA subjective audio quality test, impulse response misalignment and echo return loss enhancement. The results show that the proposed method has a good de-correlation performance while minimizing signal distortion and stereo image change.
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