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轻压在压电晶体上的笔尖座标可以通过测量声表面波从叉指换能器传播到笔所需的时间来判断。笔在晶体上移动而画出的图形能以很快的速率存储在计算机中。并提供了数据探测的例子。
Nibble coordinates on the piezoelectric crystal can be judged by measuring the time it takes SAW to propagate from the interdigital transducer to the pen. Graphics that the pen moves on the crystal and draws can be stored on the computer at a fast rate. And provides an example of data exploration.