| 摘要 |
One type of special effects generator for television systems permits one image to be superimposed over another, and to be movable so that the superimposed image may appear at any desired position on the raster of the reproduced composite image. When the superimposed image is moved so that it extends partly beyond one edge of the raster, the generator prevents that portion of the superimposed image which extends beyond the normal raster from appearing at the opposite edge thereof. |
