| 摘要 |
PURPOSE:To extract a reproducing signal and to attain high speed switching by repeating sequentially the switch operation that one of four electronic switches is turned on for 270 deg. rotation of a rotating body and the three are turned on. CONSTITUTION:The input side of four preamplifiers 57A-57D to which each reproducing sigal is applied individually from four heads A-D is provided four electronic switches SPA-SPD switched and controlled independently, and one of the electronic switches is turned off for the 270 deg. rotating period of the rotating body 1 and the rest three are turned on respectively. Thus, a reproducing is extracted from only a prescribed head of the three heads scanning slidingly onto a magnetic tape 2 at the same time. Since the electronic switches are used, no problem of chattering at switching takes place and high speed switching is attained and since no mechanical contact is provided, the life is made longer. |
