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。

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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。

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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.

基于低功耗设计考虑，调制器采用有源-无源混合型环路滤波器，并通过离散时间微分技术移除信号求和模块。

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