| 摘要 |
PURPOSE:To prevent flickers of reproduced pictures resulting from the difference in characteristics of video heads so as to improve the quality of pictures, by extracting both band components of FM and side band from the output of the video heads and combining both the band components after their sizes are respectively corrected. CONSTITUTION:The 1st filter 9 is an HPF of >=about 3MHz and extracts FM carrier band components from the output of video heads 1 and 2 and the 2nd filter 10 is an LPF of <=about 3MHz and extracts side band components from the output of the heads 1 and 2. Those outputs are corrected at AGC circuits 11 and 12 and the FM carrier band components outputted from the heads 1 and 2 are made equal to each other in size. The output of the 2nd filter 10 is corrected at the 2nd AGC circuit 2 and the side band components outputted from the heads 1 and 2 are made equal to each other. Moreover, the phases of the FM carrier band and side band components are appropriately corrected at the 1st and 2nd phase correcting circuit 13 and 14 and the both the bands are combined with each other at a combining circuit 15. Therefore, no flicker occurs even at the edge section of reproduced pictures and picture qualities can be improved. |
