| 摘要 |
A cradle receives RF signals, performs level control of the RF signals, and emits the RF signals to a main-body unit installed to the cradle. When the main-body unit is installed, the cradle receives a video signal from the main-body unit, applies signal processing to the video signal, and then outputs it. Concurrently, the cradle outputs power-supply power to the main-body unit. Further, the cradle performs level control of the received RF signals to a first level when the main-body unit is installed, and performs level control of the received RF signals to a second level higher than the first level when the main-body unit is not installed.
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