| 摘要 |
An X-Y device and a pair of trigger switches provide user control of a disc reproducing apparatus that reproduces discs which include audio data, video data, or both audio and video data. The reproduced video data is presented on a display. The reproducing device determines whether audio data, video data, or both audio and video data are stored on the disc, and interprets commands generated by the X-Y device and the pair of trigger switches as commands to reproduce the audio data, the video data, or both the audio and video data, respectively, when the display is powered on. When the display is powered off, the reproducing apparatus interprets commands generated by the X-Y device and the pair of trigger switches as commands to reproduce only the audio data.
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