| 摘要 |
PURPOSE:To bring a residence time of every depth of a diver to graph display by providing an interface circuit for reading out the storage contents of a digital storage circuit which can execute write and read-out, as a picture signal and mounting it to a portable housing together with a pressure sensor. CONSTITUTION:A pressure sensor 1, a timepiece circuit 2, a RAM 3, a power source circuit 4, an A/D converting circuit 5, an image display control circuit 6, a ROM 7, a program control circuit 8, etc., are contained in a housing 9. In this state, when a diver starts to dive, the circuit 8 sets a frequency of sampling and the number of times in accordance with a program of the ROM 7. Subsequently, water depth data is inputted from the sensor 1, data of a real time is inputted to the RAM 3 together with the water depth data from the circuit 2, and in accordance with a prescribed sampling frequency, time and the water depth data are displayed 10. Next, when sampling of the number of times of sampling which has been set in the beginning is ended, the maximum water depth to its time point is calculated 8, and stored as log data in the RAM 3. This log data is displayed on a liquid crystal plate 10. |
