Abstract: The two-path algorithm in the acoustic echo cancellation is widely applied to avoid the false adaptation problem during the double-talk situation. This paper proposed an improved transfer logic for the two-path algorithm; based on the comparison of the Echo Return Loss Enhancement (ERLE) for the filters, the improved transfer logic decided whether to permit filter update. Furthermore, the improved transfer logic managed to detect the double-talk and avoid the false filter update, improved the convergence speed and allowed the reduction of the memory requirement and computational complexity. The simulation results show the improved performance of the proposed solution.

Key words: acoustic echo cancellation, two-path algorithm, update logic, Echo Return Loss Enhancement (ERLE)

摘要： 声回波抵消两路算法被广泛用来检测系统双向通话；基于声回波抵消两路算法，提出了一种改进的控制更新逻辑。此更新逻辑通过比较滤波器的回波返回损失(ERLE)，判断是否对滤波器进行更新。此改进更新逻辑能正确检测系统双向通话，避免滤波器的错误更新，并提高两路算法的收敛速度，减小存储器资源和计算量。仿真结果证实了此更新逻辑的有效性。

关键词: 声回波抵消, 两路算法, 更新逻辑, 回波返回损失