| 摘要 |
PURPOSE:To transmit faithfully the picture signals of a contracted original, by obtaining a sampling clock signal in the main scanning direction and a folded picture signal of the secondary scan with an output control of a picture element sampling indication circuit and the number of lines eliminating control circuit, respectively. CONSTITUTION:When an original picture is copied, a video clock signal (a) is supplied to a picture element sampling circuit 11 to the primary scanning direction. At the same time, a picture element sampling indicating circuit 12 receives a picture element sampling indicating signal (b) and a copy mode signal (f) and is driven in a copy mode. Then the circuit 11 has a counting operation by the control of the output of the circuit 12. The output of the circuit 12 is applied to a gate circuit 13 along with the count output of the circuit 11, and a sampling signal (d) is obtained from the gate output. In such a constitution, the output of the circuit 13 is set at a low level by an extent equivalent to a clock and every fixed period when the signal (b) is set at a low level. Thus the signal (d) is stopped. At the same time, a picture signal (c) is written to a line memory 14 also in the secondary scanning direction. Then the number of lines is deleted in the same ratio by number of the lines eliminating control circuit 15. |
