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双向通话检测是自适应回波抵消器中的一个关键问题,其检测的速度及精度将直接影响到自适应回波抵消器的收敛性能、话音质量及其对时变回波信道的跟踪能力。本文首先回顾了自适应回波抵消器中各种常用的双向通话检测算法,并对各算法的优缺点作了简单的评估。在此基础上,作者提出了一种基于自适应算法收敛之正交性原理的双向通话检测算法。计算机模拟结果表明,该检测算法既能准确地检测双向通话状态,又能快速跟踪回波信道的变化。
Two-way call detection is a key issue in adaptive echo canceller. Its detection speed and accuracy will directly affect the convergence performance of adaptive echo canceller, voice quality and its tracking ability to time-varying echo channels. This paper first reviews various commonly used two-way call detection algorithms in adaptive echo cancellers and makes a simple assessment of the advantages and disadvantages of each algorithm. On this basis, the author proposes a bidirectional call detection algorithm based on the principle of orthogonality of convergence of adaptive algorithm. Computer simulation results show that the detection algorithm can not only accurately detect the two-way talk state, but also track the echo channel quickly.