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A method for avoiding self-oscillation in conjunction with echo cancellation
A method for avoiding self-oscillation in conjunction with echo cancellation
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机译:避免回波消除的自激振荡的方法
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摘要
A method for avoiding self-oscillation in a four-wire loop in conjunction with echo cancellation is effected with the aid of an adaptive filter (15). Self-oscillation is avoided for both long and short connections and also when signalling with narrow-band signals, by restricting the permitted range of the coefficients of the adaptive filter in a manner such that the absolute value of the filter transfer function will be sufficiently small so that amplification in the four-wire loop is less than one. This is achieved by limiting the absolute value of the filter transfer function (1Hcal), to a value which is smaller than a determined function of the echo transfer function (Hfa) in the far-end of the loop and the echo transfer function (Hne) in the near-end of the loop.
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