This CNC system employs difference interpolation method for interpolation calculation, which can directly interpolate all of conic.
插补计算采用了差分插补法，能对所有的二次曲线进行直接插补。
The quadratic monotone interpolation characteristic difference method is proposed to overcome these defects.
为克服其不足，建立和研究了二次单调插值特征差分方法。
One method is phase difference correction of partly FFT; the other is FFT frequency correction with quadratic interpolation.
一是利用分段FFT的相位差修正算法，二是基于二次内插的频率FF T校正法。
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