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.
Click to purchase paper as a non-member or login as an AES member. If your company or school subscribes to the E-Library then switch to the institutional version. If you are not an AES member and would like to subscribe to the E-Library then Join the AES!
This paper costs $33 for non-members and is free for AES members and E-Library subscribers.