H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 3/23 (2006.01)
Patent
CA 2131890
ABSTRACT OF THE DISCLOSURE The invention relates to a method for avoiding self- oscillation in a four-wire loop in conjunction with echo cancellation effected with the aid of an adaptive filter. Self-oscillation is avoided for both long and short connections and also when signaling 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 for amplication in the four-wire loop to be less than one. This is achieved by limiting the absolute value of the filter transfer function [Hca], 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.
Marks & Clerk
Telefonaktiebolaget Lm Ericsson
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