| 摘要 |
<p>Apparatus and method according to the present invention includes a wireless cursor position image device (220) and a control base (250) for detecting direction and velocity of motion of the device to calculate relative cursor motion on a display system. The image device includes a light sensing detector (224), a demodulator for removing a reference signal from the detected light, and a transducer (230) driven by the reference signal from the demodulator for transmitting a low frequency signal to the control base (250). The control base includes a light emitter transducer (252) for transmitting a modulated light signal to the image device (220), a reference signal generator, two or more low frequency detectors (254, 256) for detecting signals transmitted by the image device transducer (230), means for comparing the outputs from the detectors, and means for generating cursor control signals from the compared detector output signals.</p> |
