| 摘要 |
An electronic device has a first signal path, a first power supply path, and a connector that transmits to an external device the input signal on which the voltage has been superposed. The device also has a first power supply switch inserted into the first power supply path and an amplitude detector that detects at the connector an amplitude of the input signal, a control section that determines, based on a detection output from the amplitude detector, which a connection condition of the external device to the connector is a first condition in which the external device is not connected to the connector or a second condition in which the external device is connected to the connector. Based on the connection condition, the control section turns on or off the first power supply switch.
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