The influence of prisms surface error, mainly the local irregularerror, on the wavefront figure, is discussed.
本文讨论了棱镜表面误差（主要是局部误差）对波面面形的影响。
2
In the same time, a sliding pitch analysis window method is used, so it can reduce the pitch detection error in non-stationary speech segments with irregular pitch.
同时又采用了滑动窗的方法，使得对基音周期不规则的不平稳的语音段进行基音周期估计时的误差减小。
3
In the field of geometrical metrology, one of the important projects is the accurate measurement and error evaluation of parts profile with complicated and irregular surface.