| 摘要 |
A mobile electronic device includes an earphone/microphone port, an I/O circuit to receive a modulated data signal from data input devices via the earphone/microphone port, and a processor unit programmed to extract data from the modulated data signal. The processor unit (or the I/O circuit) detects connection of a device to an earphone/microphone connector of the mobile electronic device and determines whether the connected device is a data input device. If the connected device is a data input device, the processor unit is programmed to extract data from modulated data signals generated by data input device.
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