The spectrum error between FFT and F.T. are due to not small enough time sampling interval that cause frequency domain over lapping error (Aliasing effect) near high frequency bound.

• 快速富氏与富氏转换频谱于有限频率取样点及有限频域范围内之误差，源自时域取样间隔太大造成频域范围不足之重叠误差。