Patent ID: 6745218
Filing Date: 2004-06-01
Classification: H03H

Abstract:
An adaptive digital filter, comprising:a pipelined filtering section for perfornming a filtering operation in a pipelined process based on input data and coefficient data so as to output filtered data; a non-pipelined adaptation section for outputting the coefficient data to the pipelined filtering section by performing a coefficient adaptation operation in a non-pipelined process based on the input data and the filtered data so that the filtered data output from the pipelined filtering section converges to a predetermined reference value; and a secondary clock signal generation circuit for receiving the primary clock signal, generating the at least one secondary clock signal so as to be synchronized with the primary clock signal, and outputting the at least one secondary clock signal to the non-pipelined adaptation section, wherein the pipelined filtering section operates according to a primary clock signal having a predetermined frequency; the non-pipelined adaptation section operates based on at least one secondary clock signal which is synchronized with the primary clock signal and has a frequency which is different from the predetermined frequency; the at least one secondary clock signal includes a first secondary clock signal for latching the input data; and wherein the at least one secondary clock signal further includes: a second secondary clock signal for latching the filtered data; and a third secondary clock signal for latching a result of the coefficient adaptation operation.