| 摘要 |
an earphone plug for providing an output audio signal of a main body to an earphone, and sending a key signal to be inputted by a user to the main body; an insertion/elimination sensing unit for sensing the insertion/elimination of the earphone plug into/from an earphone jack; and a microcomputer for regulating the system to be a stop mode when an output signal from the insertion/elimination sensing unit is different from a previous signal.
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