Patent ID: 8050367

Claim:
A receiving amplitude correction circuit in a receiver including an A/D conversion unit that converts a received analog signal into a digital signal, a band limitation unit that limits bands of the digital signal, a digital signal processing unit that conducts a digital signal processing after the band limitation, and a gain controller that performs a gain control to control a level of the received analog signal based on a signal level in the digital signal processing unit, wherein the receiving amplitude correction circuit includes: a correction unit that corrects digital signal amplitudes so that the amplitudes before and after the band limitation unit are made averagely equal to each other or adjusted to have a predetermined difference, wherein the correction unit comprises a first calculation unit that calculates an average amplitude of signals immediately before the band limitation unit, a second calculation unit that calculates an average amplitude of signals immediately after the band limitation unit, and an amplitude correction unit that compares the average amplitude immediately before the band limitation unit and the average amplitude immediately after the band limitation unit and that corrects the average amplitude immediately after the band limitation unit in accordance with the comparison result, and wherein the amplitude correction unit comprises a computation unit that computes a reciprocal of a ratio of the average amplitude immediately before the band limitation unit and the average amplitude immediately after the band limitation unit and a multiplier unit that multiplies an output of the band limitation unit by the reciprocal of the ratio or a predetermined number of times the reciprocal of the ratio.