Semiconductor integrated circuit containing an automatic equalizer including a circuit for periodically updating a plurality of tap coefficients at varying frequencies

摘要

An automatic equalizer is capable of updating tap coefficients and constituted to vary the frequency at which to update the tap coefficients depending on the magnitude thereof. There are provided a plurality of ways to vary the frequency at which to update the tap coefficients. One way is to divide the taps into two groups, one group having its tap coefficients updated at a relatively high frequency, the other group having its tap coefficients updated at a relatively low frequency. Another way is to vary the frequency at which to update the tap frequency based on the result of suitably judging the magnitude thereof.