| 摘要 |
PURPOSE:To automatically control an equalizer to the optimum state, by extracting the optimum equalizing state based on the output waveform given from a magnetic recorder/reproducer and then extracting the nonoptimum equalizing state in contrast with the optimum equalizing state. CONSTITUTION:For the output waveform of an equalizer 3, the section of a small level of amplitude corresponds to the section of a large level of amplitude of the output waveform of an integrator 7. Thus the output of the integrator 7 is sliced by the threshold value through a threshold value detector 9. Then whether or not the output waveform of the equalizer 3 passes the zero level at the slicing section is checked by a zero level detector 10 and a rise detector 11. In other words, a switch 14 is controlled by an AND circuit 12 and via a timer 13 to the output of the detector 9 as well as the output of the detector 11. Then the equalizer 3 is controlled by the terminal voltage of a capacitor 6. |
