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本文介绍了交流采样中的两点积算正弦曲线拟合法，并给子数学证明．移动平均法和指数平滑滤波有效地提高了测量精度。文中给出了实现中的硬件结构图。
This article introduces the two-point integrated sine-curve fitting method in AC sampling and gives sub-mathematic proof. Moving average method and exponential smoothing filter effectively improve the measurement accuracy. The article gives the realization of the hardware structure diagram.