| 摘要 |
According to an embodiment of the present invention, a system for providing information includes: a sound wave output device which detects the motion of a user to generate and output a sound wave signal; and a mobile terminal which receives the sound wave signal and provides a user with information corresponding to the received sound wave signal. The mobile terminal includes: a sound wave signal receiving unit which receives the sound wave signal and samples the sound wave signal N times; a frequency extracting unit which extracts the frequency (first extracted frequency) of a sound wave signal with the maximum signal strength in each sampling, and which extracts the frequency (second extracted frequency) of a sound wave signal with the maximum signal strength over the total N number of times of sampling from the extracted frequency; and an information providing unit which provides a user with information corresponding to the second extracted frequency. |
