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- 为了从模拟滤波器出发设计IIR数字滤波器,必须先设计一个满足技术指标的模拟滤波器,亦即要把数字滤波器的指标转换成模拟滤波器的指标,因此必须先设计对应的模拟原型滤波器。-Starting from the design of analog filters to IIR digital filter, you must first design an analog filter to meet the technical indicators, which indicators should con