Because the accumulative frequency curve is plotted artificially, there exists arbitrariness in determining the design water level.

由于其缺乏理论曲线，因此，确定的数值存在任意性。

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The edge transition of pulses from incremental encoder can be detected with double frequency to improve measurement precision, and to avoid measurement errors and accumulative errors.

汉字和图形相结合。 对增量编码器的脉冲信号沿变化进行倍频检测，提高分辨精度，避免计数误差和累积误差。

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Frequency controlled data (m) plus an accumulative phase data output by a phase register in an N-bit adder when a clock pulse comes, the result is sent to the input port of the phase register.

每来一个时钟脉冲，N位加法器将频率控制数据m与相位寄存器输出的累加相位数据相加，并将结果送相位寄存器输入端。

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