中文说明：
用脉冲响应不变设计巴特沃斯数字低通滤波器。
English Description：
Butterworth digital low-pass filter is designed with impulse response invariance
Design of Butterworth digital low pass filter with impulse response invariance
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中文说明：
用脉冲响应不变设计巴特沃斯数字低通滤波器。
English Description：
Butterworth digital low-pass filter is designed with impulse response invariance