| 摘要 |
An echo canceler 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 such that the echo signals are sequentially cancelled in a stepwise manner. Random access memories are used to allow a decrease in the required number of bits and thus the dimensions of the memories, hence in the overall circuit, so that a compact LSI echo canceler can be easily obtained.
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