System for conditioning echo response of loop start trunk line

Details System for conditioning echo response of loop start trunk line System for conditioning echo response of loop start trunk line

H - Electricity

04

B

H04B 3/23 (2006.01) H04M 9/08 (2006.01)

Patent

CA 2570547

An echo canceling system has an adaptive filter connected to an echo source, for canceling echo from an echo path. A fixed echo conditioning filter is connected in series with the adaptive filter, intermediate the echo source and the adaptive filter. The fixed echo conditioning filter cancels the constant part of the echo path using a measured impulse response of the echo path.

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