| 摘要 |
A portable media player comprises an earphone transmission port, a detection circuit, a switch circuit, and a processor. The earphone transmission port mounted on the portable media player is electrically connected to a connector for receiving a signal or power transmitted from the connector. The detection circuit electrically connected to the earphone transmission port is used to detect a type of the connector for sending an informing signal. The switch circuit electrically connected to the earphone transmission port is used to switch between a signal inputting status and a signal outputting status according to the type of the connector. The processor electrically connected to the detection circuit and the switch circuit is used to receive the informing signal for turning on or off the switch circuit.
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