Two signals from the mass flowmeter are filtered by no change of phase, and the phase difference is given by zero passage arithmetic.

两路信号数据采集后使用了无相位变化的滤波方法，通过过零点算法计算出得出相位差。

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Before the design of digital circuit, measurement method of phase difference is discussed. Two-way zero passage phase detector is chosen as solution finally.

在正式进入数字电路设计之前，先讨论了相位差测量方法，并选定双向过零鉴相作为实现方案。

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Before the design of digital circuit, measurement method of phase difference is discussed. Two-way zero passage phase detector is chosen as solution finally.

在正式进入数字电路设计之前，先讨论了相位差测量方法，并选定双向过零鉴相作为实现方案。

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