Patent ID: 7817749

Claim:
A digital signal receiver comprising: an antenna device including a resonance circuit formed by a radiation conductor and a variable capacitance element coupled to the radiation conductor, and resonating at a resonance frequency corresponding to a tuning voltage supplied to the variable capacitance element; a digital tuner unit connected at a subsequent stage of the antenna device, the digital tuner unit receiving a digital signal in a reception channel having a predetermined bandwidth and outputting a digital reception signal, the digital reception signal including a plurality of carriers within the predetermined bandwidth; and a demodulation unit including: a multicarrier demodulator for demodulating the digital reception signal; antenna tuning control means for supplying to the antenna device a tuning voltage corresponding to a resonance frequency for the reception channel; and correction means for detecting signal levels of the plurality of carriers in the bandwidth of the reception channel, and for correcting the tuning voltage by reducing a difference between the detected signal levels of the plurality of carriers to a predetermined value or less if the resonance frequency has shifted from an original resonance frequency of the reception channel of the antenna device.