Patent ID: 7664560

Claim:
A portable media player, comprising: an earphone transmission port connecting to an external connector for receiving a signal or power transmitted from the external connector, which comprises a transmission circuit comprising: a power input pin connecting to a power transmission ring of the external connector; a first transmission pin connecting to a first data transmission ring of the external connector; a second transmission pin connecting to a second data transmission ring of the external connector; and a ground pin connecting to a ground pin of the portable media player and a ground port of the external connector respectively; a detection circuit connecting to the power input pin of the transmission circuit for detecting a type of the external connector according to the signal or power transmitted from the external connector, and then sending an informing signal representing the type of the external connector; a switch circuit connecting to the earphone transmission port for switching the earphone transmission port between a signal inputting status for allowing signal transmission through the earphone transmission port into the portable media player and a signal outputting status for allowing signal transmission out of the portable media player through the earphone transmission port; a processor connecting to the detection circuit and the switch circuit respectively for receiving the informing signal sent from the detection circuit to turn on or off the switch circuit; an input unit connecting to the processor for transmitting a command signal to the processor to switch the portable media player between the signal inputting status and the signal outputting status; a power unit connecting to the processor for supplying power to the portable media player; a storage unit connecting to the processor for storing information processed by and from the processor; and a radio-wave receiver connecting to the processor and the first transmission pin and the second transmission pin of the transmission circuit for receiving an external radio-wave signal from the earphone transmission port, wherein a ground pin of the radio-wave receiver is connected to the ground pin of the transmission circuit, and the ground pin of the transmission circuit then serves as an antenna of the radio-wave receiver and, thereby the processor is able to process the external radio-wave signal and then output the external radio-wave signal out through the earphone transmission port.