| 摘要 |
PROBLEM TO BE SOLVED: To reduce the number of line buffers. SOLUTION: Main and subpicture signals S1 and S2 are converted into main and subpicture signals P1 and P2 after a thinning by thinning sections 1 and 2. The signals P1 and P2 are properly distributed and written into line buffers A, B and C by a multiplexer 5. The written signals P1 and P2 are properly selected by a multiplexer 6 and are written into a DRAM 10. The before one field signals P1 and P2 are read from the DRAM 10 in the order in which the picture signals are displayed in parallel on a same screen and are outputted as synthesized picture signals S3. By providing the multiplexer 5, foure line buffers required for writing into the DRAM 10 in a conventional device are reduced to three line buffers. |
