| 摘要 |
In an interactive system for interacting with a printed material having at least a visual icon associated with predetermined response data, there is an ultrasonic pointing unit positionable over the at least one visual icon and arranged for generating ultrasonic wave. An ultrasonic positioning base unit is arranged for receiving the ultrasonic wave from the ultrasonic pointing unit and determining a position of the ultrasonic pointing unit based on the received ultrasonic wave. A is arranged for locating, in a data storage, the response data corresponding to the visual icon according to the position of the ultrasonic pointing unit. A response unit is arranged for outputting the response data.
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