H - Electricity – 04 – M
Patent
H - Electricity
04
M
379/64
H04M 3/18 (2006.01) H04B 3/20 (2006.01) H04B 3/23 (2006.01) H04B 3/36 (2006.01)
Patent
CA 1242541
ECHO CANCELLATION IN TWO-WIRE TRANSMISSION PATH REPEATERS Abstract of the Disclosure A two-wire transmission path repeater includes, between two hybrid circuits coupled to the path, an echo canceller and an amplifier for each direction of transmission, each echo canceller including a transversal filter and a subtracting circuit. The power ratio between signals before and after the subtracting circuit of each echo canceller is used to distinguish between simplex and duplex signals. If the power ratio exceeds a given value, which is dependent upon the input signal power, for only one transmission direction then a simplex signal in the opposite direction is determined, the gain of the amplifier for the one transmission direction is reduced, and adaptation of the transversal filter coefficients for the opposite direction is prevented. If the power ratio for both directions falls below the given value then a duplex signal is determined, the gain of both amplifiers is increased and adaptation of the coefficients of both transfer filters is continued for a short period, then the gain of both amplifiers is reduced and adaptation prevented, thereby facilitating stable operation of the repeater.
496129
Dupuis Gilles
Millar Douglas J.
Sylvain Dany
Haley R. John
Nortel Networks Limited
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