| 摘要 |
PURPOSE:To suppress line flicker and to improve the resolution of a picture display in a vertical direction by considering an information regarding a corresponded scanning line in the previous field as the information of the scanning line to be interpolated when an interpolating scanning line is generated. CONSTITUTION:With inputting a luminance signal to an input terminal 201, either of field memories 503 or 504 is selected and a picture information of one field is written on it. During the next one field period, the same information is read out two times at a time in order at the double speed of writing and is sent to an interpolating circuit 501. To the interpolating circuit 501, outputs 216 and 217 from a switch 206 are inputted and the output 216 is a signal delayed by 1H period against the output 217 and an output 509 is the signal delayed by a share of one field. The interpolating circuit 501 generates an interpolating signal 510 by changing the mixing ratio of the line informations 216 and 217 of the present field according to the line information 509 of the previous field. An original signal and the interpolating signal are outputted alternately, switching at a switch 209, to an output terminal 210 and the signal converted to one with a high picture quality having the double speed of an input signal is obtained. |
