| 摘要 |
PURPOSE:To decrease the effect due to a noise component by slicing the level based on an differentiating output signal of an absolute value of an input analog signal. CONSTITUTION:The polarity of an input analog signal (a) is converted into positive polarity by an absolute value circuit 10 and the result is fed to a differentiating circuit 11. A differentiating output signal (b) from the differentiating circuit 11 is fed to a zero cross detection circuit 12 and a level slice circuit 13. The level slice circuit 13 slices a bipolar level of the differentiating output signal with a prescribed bipolar slice level, a positive output signal (d) is fed to a set terminal S of a flip-flop circuit 14 and a negative output signal (e) is fed to a reset terminal R of the flip-flop 14 respectively, an output signal (f) at the a terminal Q of the flip-flop 14 and a detection signal (c) of the zero cross detection circuit 12 are fed to an AND circuit 15, from which an AND output signal is used as an output pulse signal (g). |
