| 摘要 |
<p>PURPOSE: A portable presentation system is provided to use s wireless electronic pen which emits an ultrasonic wave with a pair of location encoders. CONSTITUTION: A wireless pen(11) includes a ultrasonic transmitting unit by writing on a blackboard(100). A first and second receiver receives an ultrasonic wave and the sending time of the ultrasonic wave. A first and second MPU(Micro Processor Unit) analyzes information received from the first and second receiver and converts the information into first and second data. A first and second transmission unit transmits the first and second data to a terminal receiving module(14). A terminal(15) uses the distance of the first and second data and the first and second position readers(12,13) and determines the location of the wireless electronic pen. A projector(16) is connected to the terminal and projects an image to the board.</p> |
