commonChengYuList cannot be resolved

的窗函数有汉宁窗、汉明窗、布莱克曼窗等，可以根据具体应用场景选择It seems that you are facing an error related to the "commonChengYuList" variable or object in your code. Without seeing the context of your code, it is hard to provide a specific solution. However, here are a few things you can try:

1. Make sure that合适的窗函数。

（3）带阻滤波器设计：

根据题目要求，该滤波器的阻 you have defined the "commonChengYuList" variable or object in your code and that it is accessible from the current scope.

2.带范围为100Hz-200Hz，通带截止频率为60Hz和240Hz，通带允许最大 Check if the variable name is spelled correctly and that it is declared with the correct data type.

3. If "commonChengYuList"衰减为3dB，阻带应达到的最小衰减为30dB。

可以选择IIR数字滤波器进行 is a part of a library or external package, make sure that it is imported correctly and that the package is installed properly.

4. Verify that设计，由于要同时满足通带和阻带的要求，可以选择Chebyshev类型I滤波器， there are no syntax errors or typos in your code that may be causing the error.

If none of these solutions work, please provide more details on the context and code you are using so I can assist you better.