The accuracy and the existent problem of forward difference method are analyzed on the basis of comparing the transfer function of recursive formula with theoretical transfer function.
本文把四种方法统一写成递归格式，从理论上研究其共性特征，然后从递归公式所构造的数字滤波器的传递函数与理论传递函数比较的角度进行了分析。
The accuracy and the existent problem of forward difference method are analyzed on the basis of comparing the transfer function of recursive formula with theoretical transfer function.
本文把四种方法统一写成递归格式，从理论上研究其共性特征，然后从递归公式所构造的数字滤波器的传递函数与理论传递函数比较的角度进行了分析。
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