| 摘要 |
<p>An echo canceler is proposed wherein nonlinear characteristics of a D/A converter are eliminated so as to effectively cancel an echo (leakage component). Random access memories are used to allow decrease in the dimensions of the memories and hence in the overall circuit so that a compact LSI echo canceler can be easily obtained. In an embodiment an echo canceler is provided which performs convergence in a multiple step manner using a plurality of adaptive digital filters. The adaptive digital filters are sequentially operated to supply data to the corresponding D/A converters. The echo signals are sequentially cancelled in a stepwise manner. As a result, a required number of bits of D/A converters is decreased. A compact LSI echo canceler can be readily obtained.</p> |
