| 摘要 |
PURPOSE:To double the speed of video signal and to use the memory as a delay line and also to widen the scope of utilization by setting the read time equal to one horizontal cycle so that the memory can be used also as a delay line in the system for doubling the speed of video signal using a line memory. CONSTITUTION:At the time of double speed mode, a switch 8 is connected to a contact (a), and a mode control circuit 7 controls a read address counter 5 so as to generate the address signals at the double speed of a write address counter 4. At the time of one horizontal cycle delay line mode, the switch 8 is connected to a contact (6) and the control circuit 7 writes the read address counter 5 and controls so as to generate the address signal at the same speed of the address counter 4. As the address of a memory 3 is set from address 0 to address n-1, the read address counter 5 supplies the read address signal corresponding with address 0 - address n-1 by each 1H to a memory 2 through the memory control 3, and reads out the data written on each address of the memory 2.
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