| 摘要 |
PURPOSE:To memorize the video signals equivalent to one picture screen after selection with every several scanning lines, at the same time reading out the video signals in a low speed to supply them to the low-speed input unit. CONSTITUTION:Output signal ES given from ITV unit 1 is written into 1-line speed conversion memory 3 through analog switch circuit 2. Signal ES read out of memory 3 in a low speed is supplied to the low-speed input unit after the A/D conversion. Vertical synchronous signal VD given from unit is counted by counter 7 featuring maximum 6 bits and then supplied to multiplexer 8. In the same way, horizontal synchronous signal HD is counted by counter 9 of maximum 6 bits and then decoded through decoder 10 to be supplied to multiplexer 8. Accordingly, multiplexer 8 is given to analog switch 2 plus control circuits 4 and 6 in the form of control signal RC which designates the scanning line of No.6N-5 (N=1, 2...). Thus the video signals equivalent to one picture screen can be supplied to the input unit with no loss. |
