Patent ID: 7215937

Claim:
A radio wave reception device comprising: radio wave reception means which receives amplitude modulation signals; gain control means which outputs gain control signals; amplitude modulation signal amplification means which amplifies the amplitude modulation signal received from said radio wave reception means, according to the gain control signal output from said gain control means; frequency conversion means which mixes the signal output from said amplitude modulation signal amplification means with a predetermined oscillation signal, and outputs the signal as an intermediate frequency signal; intermediate frequency signal amplification means which amplifies the intermediate frequency signal output from said frequency conversion means, according to the gain control signal output from said gain control means; and detection means which detects the signal output from said intermediate frequency signal amplification means, and outputs a detection signal, wherein said gain control means includes: inversion means which inverts said detection signal; first multiplication means which multiplies the signal inverted by said inversion means with the signal output from said intermediate frequency signal amplification means; and generating means which generates said gain control signal, according to the signal level of the signal multiplied by said first multiplication means.