| 摘要 |
The invention relates to a mobile apparatus which comprise a casing provided with input means, at least one accelerometer, and at least one sound detecting device for detecting a sound. The input means comprise an at least partly raised surface, and wherein, when an object is moved over the at least partly raised surface a vibration, detectable by the accelerometer, occurs which, in turn, generates a sound detectable by the sound detecting device. The detected vibration and sound is representative of the length and direction of the movement by the object over the at least partly raised surface.
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