公开(公告)号：DE60121632D1

公开(公告)日：2006-08-31

申请号：DE60121632

申请日：2001-05-17

Applicant: ST MICROELECTRONICS ASIA

Inventor： TIAN WEN SHUN ,  ALVAREZ-TINOCO MARIO

IPC: H04B3/23 ,  H04M9/08

Abstract: In a communications system having incoming communications signals and outgoing communications signals the outgoing communications signals may undesirably include an echo signal derived from the incoming communications signals. Accordingly, echo cancellation techniques may be applied in the communications system, including generating weighting filter coefficients based on linear prodictive coding coefficients calculated from a block comprising a plurality of sequential samples of the incoming communications signals. The incoming communications signals are filtered through a weighting filter utilising the weighting filter coefficients to produce a weighted incoming communications signals. Estimated echo signals are generated by filtering the incoming communications signals through an adaptive transversal filter, the adaptive transversal filter using adaptive filter coefficients. Then, the estimated echo signals can be subtracted from the outgoing communications signals to produce error signals. Advantageously, the adaptive filter coefficients are determined for each sample in said block on the basis of the weighted incoming communications signals and the error signals.