| 摘要 |
A disc drive, which inputs and outputs signals by an earphone jack. The signal processing circuit includes a digital-to-analog converter, a memory for storing firmware programs, a signal switch device, and an earphone jack coupled to the signal switch device. When the signal switch device is coupled to the digital-to-analog converter, an audio signal is output from the disc drive through the earphone jack. When the signal switch device is coupled to the signal processing circuit, a digital signal is input or output to/from the disc drive through the earphone jack.
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