| 摘要 |
PURPOSE:To enable to perform definite performance of reception by selectively changing over the intermediate trequency circuit in broad or narrow band with the presence of adjacent channels in FM reception. CONSTITUTION:The IF circuits 11 and 12 in narrow and broad band and the adjacent channel signal detection circuit 13 are connected in parallel with the front end 10 so that the switching circuit 14 can be selected to the circuit 11 side which inputs the output of the circuits 11 and 11 if the output of the circuit 13 and the stereo signal detection circuit 18 is present, and when no output is present in the circuit 13, the circuit 14 is changed over to the circuit 12 and the output of the circuit 14 is fed to the stereo demodulation circuit 17. |
