Method of and device for the digital cancellation of the...

Details Method of and device for the digital cancellation of the... Method of and device for the digital cancellation of the...

H - Electricity

04

M

379/64

H04M 3/18 (2006.01) H04B 3/23 (2006.01)

Patent

CA 1221180

Abstract In the determination of equivalent echo channel pulse response, digital filtering techniques of the transversal adaptive type are used, and the pulse response of the equivalent echo channel is subdivided into three intervals, the second of which consists of the significant portion of the pulse response and is determined by an iterative search for the value and position of the coefficient of maximum absolute value; the first represents a pure delay and the third represents the contribution of the lowest frequencies of the base band. In simulating the echo-signal only the pulse-response coefficients whose index is comprised in the second interval are considered, together with samples of the signal to be copied belonging to preceding sampling instants whose index is also comprised in the second interval.

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