Patent ID: 7480496

Claim:
A high-frequency receiver comprising: (a) a high-frequency signal input terminal for receiving high-frequency signals; (b) a tuned filter coupled to the input terminal; (c) a first mixer including a double balance mixer circuit having a first input terminal which receives an output signal from the tuned filter and a second input terminal which receives an output signal from a local oscillator; (d) an output terminal for receiving an output signal from the first mixer; (e) a second mixer connected between the tuned filter and the output terminal, and having an image rejection mixer circuit which receives an output from the local oscillator; (f) a power supply control circuit coupled to the image rejection mixer circuit and controlling a power supply which powers the image rejection mixer circuit; (g) an image interference determiner coupled to an input side of the power supply control circuit; and (h) a phase locked loop (PLL) circuit coupled to the local oscillator, wherein an input terminal of the image interference determiner receives an output signal of a position data obtaining means; the image interference determiner determines, in response to a position data obtained from the position data obtaining means, whether or not a received channel involves image interference so as to determine whether or not image interference exists at a present position with respect to a channel desirable to be received, and the power supply control circuit stops the supply of power to the first mixer so as to allow the first mixer to work as the double balance mixer when the determiner determines no image interference exists.