The wireless location electronic whiteboard based on ultrasonic signal has many advantages, but this type electronic whiteboard is easily interfered by aculeated sound signal because the frequency of the ultrasonic signal the frequency is lower.

• 我们实验室在基于无线定位理论的基础上，已成功研制成基于超声波信号定位的多功能交互式无线定位电子白板。 基于超声信号定位的无线定位的电子白板虽然有诸多优点，但是由于超声信号的频率较低，在实际应用场合极易受到其它尖锐声音信号的干扰。