| 摘要 |
PURPOSE:To secure reduction of the unpleasant sound by securing the automatic reduction of the amplification degree when the field intensity lowers to generate the unpleasant sound, thus ensuring the pleasant reception when running at the areas near to the mountain or the valley. CONSTITUTION:The radio receiver consists of antenna 1, high frequency amplifying circuit 2, frequency converting circuit 3, local oscillating circuit 4, intermediate frequency amplifying circuit 5, FM detecting circuit 6, signal delay circuit 7, amplification degree control circuit 8 and stereo demodulating circuit 9 each. Circuit 8 is constituted so that the amplification degree may be controlled by the control signal obtained through circuit 5. And the amplification degree is lowered by the input signal sent from antenna 1, i.e., as the field intensity becomes less. |
