| 摘要 |
PROBLEM TO BE SOLVED: To reduce a footprint and cost of a substrate for avoiding spurious interference when two high-frequency signals are allowed to be concurrently received by a superheterodyne receiver.SOLUTION: A heterodyne receiver comprises: a set switch 20 operated by a user when spurious interference occurs to cause an audio signal to be suppressed; and a control circuit 50 which changes local oscillation frequencies of local oscillator 621, 622, 721, 722 in response to the user's operation so as to interchange receiving frequencies between left and right channels, and which switches an analog switch IC 80 to interchange left and right audio signals. Accordingly, avoidance of the spurious interference is achieved without increasing a frequency variable range of the local oscillator more than is necessary and without changing another component.SELECTED DRAWING: Figure 2 |
