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文中介绍一种全双工模拟话密系统的自适应回波抵消器,该抵消器用块修正方法更新横向滤波器的系数。这种方法的收敛性能和计算效率均优于标准的最小梯度算法,且满足国际电报电话咨询委员会(CCITT)建议的回波抵消器要求G.165.
In this paper, an adaptive echo canceller of full-duplex analog-to-speech system is introduced. The canceller updates the coefficients of the transversal filter by a block-correction method. This method has better convergence and computational efficiency than the standard minimum gradient algorithm and meets the echo canceller requirement G.165 recommended by the International Telegraph and Telephone Consultative Committee (CCITT).