| 摘要 |
An RF-amplifier circuit and an IF-amplifier circuit are provided with each having a gain that can be freely adjusted, and when synchronization with a reception signal from a digital broadcast is not established though the level of the reception signal is high enough, the gain of the RF-amplifier circuit is decreased and the gain of the IF-amplifier circuit is increased, whereby the level of the reception signal is maintained constant and a stronger input caused by a radio wave from an analog broadcast is reduced.
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