| 摘要 |
<p>PROBLEM TO BE SOLVED: To establish an unknown time measuring system capable of ensuring satisfactory accuracy and having a low introduction cost while taking full advantage of a popular portable information terminal such as a smartphone.SOLUTION: A magnetic sensor 102 for detecting magnetism generated from a magnetic bar 30 buried in a measurement point on a road surface 20, is connected to a smartphone 110 via a microphone terminal 112. After a signal input from the magnetic sensor 102 is changed into a digital signal sampled at prescribed periods by a speech recognition API (Application Programming Interface) previously provided in the smartphone 110, the unknown time measuring system identifies passing timing when the magnetic sensor 102 passes through a measurement point on the basis of the digital signal. The unknown time measuring system measures unknown time by calculating difference of the plurality of identified values in passage timing.</p> |
