Design of the filter is essentially application of approximation theory.
滤波器的设计，实质上是数学逼近理论的应用。
Digital filter technique theory analysis and application design.
数字滤波技术的理论分析和应用设计。
An attempt also was made to apply the theory to the filter feeding problem.
还尝试将此理论应用于过滤供水问题。
The accurate mathematics model of active power filter is the theory base for control realization.
建立有源电力滤波器的数学模型，是实现其控制的理论基础。
The accurate mathematics model of active power filter is the theory base for control realization.
建立有源电力滤波器的数学模型，是实现其控制的理论基础。
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