| 摘要 |
PURPOSE:To make it possible to read and display the content of a memory for received signals when appropriate in accordance with the display mode by providing output means and counting means respectively specified and fixing the position of the sea bottom display position on a display device by means of making the result of a specific calculation the address for reading out of row. CONSTITUTION:The set detection depth range (a) at the time of obtaining received signal that is displayed on the display starting line on the display device 13 and the sea bottom depth a/mo.B are obtained, and the means that outputs before the display and each set detection range depth at the time of obtaining each received signal to be displayed are obtained. The means to output everytime received signal is displayed on lines and means to output the value (d) to select the dm-th line of picture elements and constant period pulse are counted repeatedly (m) times, and counting means 14 and 22 are provided which counts (x) at a moment. Then, by making the result of the calculation: bmo/aym.x+(a/mo.B- db)Xmo/ay the address of reading in the memory circuit, the sea bottom display position at the display starting line on the display device 13 is fixed on the picture elements of the dm-th line. |
