| 摘要 |
PURPOSE:To obtain an excellent video quality without unevenness, by correct interlace at the head of a slave screen, detecting the field of content of picture changed on its way of the slave screen, and correcting the address so that correct interlace can be made. CONSTITUTION:A 0 field signal output 122 of a field polarity detecting circuit 641 of a slave screen video signal, an E field signal output 121 of a field polarity detecting circuit 642 of a television video signal, and a timing (t) signal output 124 are logically summed, and the result is input to a write-in address delay circuit 643 to correct the interlace. Next, in case of correction on the way of a slave screen, the signal whether or not the correction is made at the head of the slave screen is formed at a correction presence detecting circuit 648, it is input to a polarity selecting circuit 647, and if the correction is present, an E field signal is output as a selected polarity signal 126 and if absent, a 0 field signal is output for correction. |
