| 摘要 |
<p>Disclosed are a method and a system for imputing information using ultrasonic signals. According to the present invention, a signal generation device for generating a reference signal and ultrasonic signals or an information input device for generating the reference signal receives the reference signal and the ultrasonic signals generated from another signal generation device for executing and information input in an adjacent space or another information input device, determines interference possibility with respect to signals generated from another signal generation device or another information imput device, and prevents signal interference by changing adaptively a valid period for generating the reference signal and the ultrasonic signals in a quiet period within the same period or the next period when the interference possibility is determined. In accordance with the present invention, the information can be inputted stably under the presence of a plurality of information input systems.</p> |
