| 摘要 |
In a television receiver having a picture tube with the picture plane aspect ratio being different from the image size aspect ratio in the existing standard television system, when an image in the existing standard television system is displayed, variation in the video signal positioned adjacent to at least one of the vertical ends on the picture plane of the picture tube is detected. If no variation an enlargement mode enlarging the image size is selected, and if any variation a normal mode displaying the image in ordinary size is selected, thereby the enlargement mode or the normal mode is selected automatically in response to the effective image size and the troublesome work of manually changing the modes is eliminated.
|
