ERROR SIGNAL GENERATION DEVICE

摘要

An error signal generation device includes: a signal measurement unit (108) for measuring two outputs of an adjustment unit (106) for multiplying two signals as an origin of an error signal by a gain and an offset; an offset amount learning unit (109); a balance correction value adjustment unit (110); and a balancer correction unit (111). An offset amount from a calculation reference level of a balance calculation unit (107) is calculated for a signal in unfocused mode. Only the signals in focused mode are balance-calculated and correction is performed in accordance with an offset amount, so that the output dynamic range of the adjustment unit (106) is utilized to its maximum extent in focused mode.