| 摘要 |
PURPOSE:To reduce a memory capacity required to generate a frame signal by reading a start point address and an end point address or the start point address and a data length on a scanning line from a frame information memory so as to generate the frame signal. CONSTITUTION:A vertical start point detection circuit 15 and a vertical end point detection circuit 16 of a frame signal generating circuit 14 compare an output of a vertical counter 12 with a readout data from a frame information memory 11 to detect a start point and an end point in the vertical direction to which a reduced picture is inserted. Moreover, a horizontal start point detection circuit 17 and a horizontal end point detection circuit 18 of the frame signal generating circuit 14 compare an output of a horizontal counter 13 with a readout data from the frame information memory 11 to detect a start point and an end point in the horizontal direction to which a reduced picture is inserted. As a result, the frame signal to insert a reduced picture signal is generated. Thus, the memory quantity required to generate the frame signal is reduced. |
