Patent ID: 7801211

Claim:
A communication system in which a signal is transferred, comprising: a transmitter that transmits a signal; a receiver that receives a signal transmitted thereto; and an adaptive equalizer that generates a compensated signal by compensating degradation of the signal to be received by the receiver, the adaptive equalizer including: a signal compensating section that generates the compensated signal by passing therethrough the signal to be received by the receiver; a jitter measuring section that measures jitter of the compensated signal output from the signal compensating section; and an adjusting section that adjusts a characteristic of the signal compensating section so as to reduce the jitter of the compensated signal which is measured by the jitter measuring section, wherein the communication system operates in (i) an actual operating mode in which a data signal to transmit is transferred and (ii) a calibration mode in which an adjusting signal for calibration is transferred, and the adjusting section adjusts the characteristic of the signal compensating section in both of the actual operating and calibration modes, in such a manner as to satisfy a condition that a variation in the characteristic of the signal compensating section is controlled to be smaller over a unit time when the communication system operates in the actual operating mode than when the communication system operates in the calibration mode.