| 摘要 |
PURPOSE:To prevent the malfunction that the dorp-out compensating operation is inhibited erroneously by the noise due to drop-out, by attenuating noise components due to drop-out. CONSTITUTION:If the signal level of components which carry audio information in an RF signal is reduced by drop-out, the drop-out detection signal is outputted from a drop-out detecting circuit 12. At this time, an analog switch 11 is turned on, and a level limiting circuit 10 is operated, and the level of the noise which ie generated in a reproduced audio signal by drop-out is reduced by the voltage dividing action of an impedance circuit consisting of a capacitor C6 and resistances R10 and R11. Thus, the malfunction that ringing occurs in the output of a tuning circuit 7 by the noise of the reproduced audio signal due to drop-out to turn on a transistor Q3 erroneously is prevented in a high band detecting circuit 4. |
