通常，信息的存在在形式是信号幅度绝对幅度或相对幅度、频率或频谱成分、相位或者和其他信号之间的时序关系。

This information normally exists in the form of signal amplitude (absolute or relative), frequency or spectral content, phase, or timing relationships with respect to other signals.

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通常，信息的存在在情势是信号幅度尽对幅度或绝对幅度、频率或频谱成分、相位或者跟其余信号之间的时序关联。

This information normally exists in the form of signal amplitude (absolute or relative) frequency or spectral content phase or timing relationships with respect to other signals.

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本文采用基于傅立叶变换(DFT)的频谱分析方法，计算流量信号的频率和相位差。

This paper presents calculation of frequency and phase difference of flow signals with spectrum analysis on basics of Fourier transform (DFT).

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