Reflected wave signal is processed by double channels two-order low-pass active filtering in hardware, and indicator diagram signal is processed by digital filtering in software.
液面反射波信号主要在硬件方面采用双通道二阶有源低通滤波，功图信号则在软件方面采用数字滤波算法。
2
To create an reset input to the supervisory chip, its input must receive an active-low ground signal, requiring transistor Q1 to turn on.
为管理芯片产生复位输入，其输入必须接收低有效的地信号，需要晶体管q 1导通。
3
Upon the low power design consideration, a hybrid active-passive loop filter is employed and the signal summing block is removed by using discrete-time differentiation technique.