The digital decimation filter taking the important constituent in the Delta-Sigma Analog-to-Digital converter is realized by the multistage structure.
数字抽取滤波器是它的重要组成部分，通常采用多级结构来实现。
Thirdly, we build the systematic model with static structure and dynamic behaviour by using UML to make Object-Oriented Analyze of the producing cost controlling and managing system in SIGMA.
第三，运用UML统一建模语言，建立具有静态结构和动态行为的系统模型，对星玛电梯生产成本控制管理系统进行面向对象的分析。
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