Mobile phone terminal, container water level determination system, and container water level determination method

摘要

PPROBLEM TO BE SOLVED: To obtain a bath water level reporting system that can be utilized easily, is inexpensive and safe, and allows a user to receive a report reliably even if the user is away from a bathroom. PSOLUTION: Underwater sound at an appropriate water level in the bath 1 is acquired, the frequency analysis of the sound of water poured into the bath 1 is made by digital Fourier transform processing by using an FFT method, and the analysis result is recorded. The cellular phone terminal 2 in a waterproof/floating structure is arranged on the water surface, water starts to be poured into the bath 1 from a pour port 3, and underwater sound is measured. The frequency is analyzed by the FFT method in comparison with a frequency at an appropriate water level stored in advance, and an alarm is operated when they become identical. PCOPYRIGHT: (C)2005,JPO&NCIPI