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文章叙述了电话会议系统中回波产生的原因，以及解决这一问题的传统方法和发展中的自适应回波消除方法，给出了CCITT的有关建议。
The paper describes the causes of echoes in teleconferencing systems, as well as the traditional methods to solve this problem and the development of adaptive echo cancellation methods, and gives some suggestions on CCITT.