| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent a display of a weak echo from standing out. SOLUTION: A user sets an image plane background color and a strongest signal display color by operation of an operating part 10. A color pallet preparing part 9 prepares a color pallet on the basis of the set image plane background color and strongest signal display color and it is stored in a display memory part 5. The color pallet is prepared so that the stronger the echo, the nearer its display color is to the strongest signal display color, and the weaker the echo, the nearer its display color is to the image plane background color.</p> |
