FIR filter in the guarantee range characteristics to meet technical requirements at the same time, very easy to do have the strict linear phase characteristic.

fir滤波器在保证幅度特性满足技术要求的同时，很容易做到有严格的线性相位特性。

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But design only considered the range characteristics, didn't consider phase characteristic, the design is a certain general filter nonlinear phase characteristic.

但设计中只考虑了幅度特性，没考虑相位特性，所设计的滤波器一般是某种确定的非线性相位特性。

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IIR the design of the digital filter method is to use the filter mature theory and simulation design charts for design, so keep some classic simulation filter excellent range characteristics.

IIR数字滤波器的设计方法是利用模拟滤波器成熟的理论及设计图表进行设计的，因而保留了一些经典模拟滤波器优良的幅度特性。

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