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idealfilter
- 理想低通滤波器的matlab实现代码，不是很完善，望见谅。-Ideal low-pass filter to achieve the matlab code, is not very perfect, hope will be forgiven.
firdesign
- 设计一个数字低通滤波器，来近似一个理想数字滤波器-Design a digital low-pass filter to approximate an ideal digital filter