| 摘要 |
The video signal for the sub-picture is output to the main picture/sub-picture superimposing part through the sub-picture video system discriminating part, video/chroma/deflecting part, A/D converting part, sub-picture video vertically compressing part, data re-arranging part (for writing into the memory), video memory, data re-arranging part (for reading out of the memory) and D/A converting part. On the other hand, the video signal for the main picture is output to the main picture/sub-picture superimposing part through the main picture video system discriminating part, video/chroma/deflecting part, A/D converting part, video memory and D/A converting part. The main picture video signal and sub-picture video signal are superimposed in the main picture/sub-picture superimposing part and are displayed on the left and right on the picture of the CRT. On the basis of the discriminating results of the respective discriminating means of the sub-picture video system discriminating part and main picture video system discriminating part, the controlling part will reduce the number of scanning lines of the sub-picture video signal and will compress the sub-picture video in the vertical direction in the sub-picture video vertically compressing part in case the number of scanning lines of the sub-picture video signal is larger than the number of scanning lines of the main picture video signal. Therefore, the two video signals different in the number of scanning lines can be displayed simultaneously on the left and right on one CRT. <IMAGE> |
