A Design of the Quantizer of H.261 CODEC

This paper introduces two steps to design a quantizer of H. 261 CODEC: thefirst step is to implement the coarse quantizing through control algorithm for the buffer' soccupation ratio ; the second step is to finish the accurate uantizing through the control algorithmof visual characteristics . Moreover, satisfactory effects are got using these algorithms throughexperiment.

基于智能特征提取的模糊建模及鲁棒控制

针对航空发动机全包线线性模型难以在线建立问题,提出一种基于智能特征提取的模糊建模方法。设计航空发动机特性表征参数,采用近邻传播算法提取航空发动机特性,将特性提取区域中心稳态工作点作为Takagi-Sugeno(T-S)模糊模型标称点建立全包线T-S模糊状态空间模型。基于该T-S模糊模型结合H∞控制理论,设计参考模型H∞控制器并开展仿真验证,仿真结果表明:T-S模糊状态空间模型稳态误差处于10^(-3)量级,满足模型精度要求且H∞控制器响应时间小于1 s,无稳态误差,具有较好的控制效果。