Four step phase-shift method program and least squares phase solution package, have validation, this method is good.

说明：四步相移法程序和最小二乘法相位解包裹程序，已经验证，此方法比较不错。

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This paper introduces the basic principles of the band pass filter, laying emphasis on the designing of four-step band pass filter, and gives the details of design method and debug process.

简要介绍了带通滤波器的原理，着重说明四阶带通滤波器的设计方法，并给出设计思路和调试方法。

youdao

This paper laid emphasis on the designing of four-step band pass filter, and gives the details of design method and debug process.

重点介绍了四阶带通滤波器的设计方法，并给出设计思路和调试方法。

youdao