Patent ID: 7558189

Claim:
An image signal cancel-type heterodyne reception method comprising the steps of: mixing a high-frequency signal received and amplified with locally oscillated two-phase output signals of a first local oscillator which have different phases, to generate two-phase intermediate-frequency signals; summing a pair of modulated signals of the two-phase intermediate-frequency signals which are modulated using two modulating orthogonal signals which are orthogonal to each other, to generate one synthesized signal; amplifying the synthesized signal to generate a synthesized-signal amplifier output signal; and modulating the synthesized-signal amplifier output signal by using signals obtained by modulating two-phase output signals of a second local oscillator which have different phases by using the modulating orthogonal signals, to generate a desired base-band signal from which an image signal has been canceled, thus demodulating the base-band signal.