| 摘要 |
PURPOSE:To realize non-interlace display without using a high speed RAM or the like by writing a interlace display data in a buffer memory at each horizontal period and reading it twice repetitively for each horizontal period in a double speed at write to apply the signal to a picture tube. CONSTITUTION:A converter 20 is inserted between an IF circuit 18 and a video circuit 2. Signals ADWR, WRX, RDX are applied to a memory (22A) at every other horizontal period on an interlace (ITL) screen, signals R-Y from the IF18 are written in the memory 22A, signals ADRD, WRY, RDY are applied to a memory 22B and then the signals R-Y of the memory 22B are read. Since the signal ADRD is changed in a speed twice that of the signal ADWR and repeats the same address twice at one horizontal period of the ITL screen for each 1/2 horizontal period, the signals R-Y for this period's share are read repetitively twice in double speed at one horizontal period of the ITL screen. Further, the signals R-Y from the memory 22B are applied to the video circuit 2. The W/R of the memories 22A, 22B is inverted at each other remaining horizontal period. |
