Recovery of previous filter coefficients with smal

专利名称：Recovery of previous filter coefficients with

smaller capacity memory

发明人：Taisuke Sasada申请号：US08/631241申请日：19960412公开号：US05796820A公开日：19980818

摘要：The echo canceler includes an N-tap FIR filter and a coefficient controller.Previous filter coefficients which were generated before an estimation error occurrencewhen the transmitting output signal becomes greater in power than the transmittinginput signal are obtained by using only a number S of coefficient correction values andanother number (N-1+ S) of sequentially received signals. Since the latest (N-1) receivedsignals are stored in (N-1) delay circuits of an N-tap FIR filter, respectively, a relativelysmall capacity memory may be provided to store the earlier S received signals. Thenumber S is determined so that a time interval determined by the number S of samplinginstants is longer than a response time of a double talk detector.

申请人：NEC CORPORATION

代理机构：Scully, Scott Murphy and Presser

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