| 摘要 |
PURPOSE:To realize a reproducing system that can select and extract assuredly the desired one among different video signals with a simple constitution, by recording different video signals at every revolution of a disk and changing the track of a reproducing stylus at a connection point of video signals. CONSTITUTION:The different video signals are recorded to a disk 11 at every revolution. The high frequency signal read out of the video 11 is applied to a demodulating circuit 14, band pass filters 15 and 16, and an fP3 wave detector 17 via an amplifier 13. While a mode signal is applied to an input terminal 21 to select the 1st or 2nd program which is designated by an operator. The mode signal is then supplied to a control circuit 20 to control a switching circuit 19. The output of the circuit 19 is turned into a tracking error signal via wave detectors 23 and 24 and a differential amplifier 25. The tracking error signal is applied to a tracking coil 27 after actuating a driving circuit 26. Thus a reproducing stylus 12 is shifted in the radius direction of the disk 11 by an extent equivalent to a track pitch. |
