| 摘要 |
PURPOSE:To remove a pulse component due to dropout and to execute precisely a time base correction operation by adding an output of an amplitude controller to that of a low-pass filter so as to obtain a signal and by supplying the obtained signal to a coil displacing a regenerated element in the time base direction. CONSTITUTION:Only a low frequency signal (b) of an output (a) of a phase comparator 11 is taken out by a low-pass filter 16 of cut-off frequency fCL=120Hz, and supplied to a phase shifter 17, a substrator 18, and a phase shifter 19. An output (b) of the low-pass filter 16 is subtracted from an output of the phase shifter 19 in the substrator 18, and a signal (c) is emitted. An output C of the subtractor 18 is supplied to a limiter amplifier 20. An amplitude is limited so that the maximum amplitude and the conceivable maximum width of time base error displacement, in which the stylus 14 can normally execute time base correction operation, can be obtained, and the amplitude is made into a signal (d). |
