| 摘要 |
PURPOSE:To improve the transient characteristics when the peak voltage of a readout signal changes, by switching a threshold value into a plurality with a threshold voltage generating circuit inputting a mode signal to a gate pulse generating circuit. CONSTITUTION:The output of a lead channel amplifier 2 causes no transient characteristics, since no level change by a mode signal (6) is caused. The control by the mode signal is converted into an output of a threshold voltage generating circuit 11 and applied to a gate pulse generating circuit 4, the output (4) of the circuit 4 is given to a demodulator 5 together with the zero crossing detected output and an output (5) of the same waveform as the output (4) is obtained from the demodulator 5. In this case, no transient characteristic appears at the outputs (4), (5) by the signal (6). Address marker can be detected from the output (5). |
