| 摘要 |
PURPOSE:To make it possible to follow up a signal whose threshold value rises quickly in a short time by using as the threshold value of a signal detecting circuit a value obtained by attenuating the greatest value among a maximum value one sample before, a fixed threshold value and current input data. CONSTITUTION:By a ''1'' signal from control terminal 22, the fixed threshold value of fixed threshold value generator 23 is selectively output from the 1st input terminal of selector 24 and from the 1st input terminal of selector 25, the output of multiplier 29, i.e., the product of a maximum value selected one sample before and a coefficient is selectively output. The outputs of selectors 24 and 25 are input to comparator 26. Under the control of comparator 6, selector 27 outputs selectively a greater output between selectors 24 and 25. Then, the output of a digital filter is selectively input from the 2nd input terminal of selector 24 by a ''0'' signal from terminal 22 and from the 2nd input terminal of selector 25, the output of selector 27 is selectively input. Selector 27 sends out selectively greater one between two outputs. The output of selector 27 is output to terminal 31 being attenuated by attenuator 30 as much as a preset value. |
