Following the analysis of the mechanism for shaping form errors during machining curved surfaces on CNC milling machine, the method for measuring form errors and error source is put forward.
分析了数控铣床曲面加工形状误差的形成机理，提出对形状误差及误差源的测量方法。
The source and influence of the helical mechanism error are discussed, and the solution for diminishing the error is also proposed.
对螺旋运动机构误差的产生及其影响进行了分析，提出了解决措施。
First the paper studies the algorithms of AMR speech coder. The AMR speech coder consists of the multi-rate speech coder, a source controlled rate scheme, and an error concealment mechanism.
本文首先研究了AMR声码器的算法，AMR声码器主要由多速率语音编码器、源控速率方案和错误消除机制三大部分组成。
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