Patent ID: 8787437

Claim:
An adaptive equalizer, comprising: an adaptive equalizing unit, for adaptively equalizing an inputted signal to output the equalized signal; a coefficient updating unit, for updating a coefficient of a filter of the adaptive equalizing unit; a switching unit, connected between the coefficient updating unit and the adaptive equalizing unit, wherein when the switching unit is on, the coefficient updating unit is capable of updating the coefficient of the adaptive equalizing unit, and when the switching unit is off, the coefficient updating unit is incapable of updating the coefficient of the adaptive equalizing unit; and a monitoring device, for controlling on or off of the switching unit in accordance with a down sampling phase of the inputted signal or a down sampling phase of the equalized signal, wherein the monitoring device comprises: a phase detecting unit, for detecting the down sampling phase of the inputted signal or the down sampling phase of the equalized signal; a determining unit, for determining whether the down sampling phase detected by the phase detecting unit is within a predetermined range; and a controlling unit, for controlling on and off of the switching unit in accordance with the determination result of the determining unit.