关键词: 立体声声学回声抵消, 宽线性模型, 非线性失真, 仿射投影算法

Abstract: The existing approach of stereophonic acoustic echo cancellation is designed by a two-input/two-output system with real random variables. Its structure appears to be complex and it is difficult to realize. This scheme will be recast as a single-
input/single-output system with complex random variables by approved the widely linear model. The advantage of this method is that instead of handling two real output signals separately, it only handles one complex output signal. Moreover, the perception and quality of the stereo will be modified by the phase and module of the complex input signal, respectively. The coherence can be declined by making the input signal reasonably distorted in order to solve the nonuniqueness problem. The widely linear model and distorted signal are applied in affine projection algorithm to verify the misalignment and convergence. Experimental results indicate that the proposed method has good numerical features of less misalignment and fast convergence, so the SAEC with widely linear model has more advantage.

Key words: Stereophonic Acoustic Echo Cancellation（SAEC）, widely linear model, nonlinear distortion, Affine Projection Algorithm（APA）