设计一个数字FIR低通滤波器，其技术指标如下： Wp=0.2pi Rp=0.25Db Ws=0.3pi As=50db 试写出MATLAB设计的源程序。-Design a digital FIR low-pass filter, the technical indicators are as follows: Wp = 0.2pi Rp = 0.25Db Ws = 0.3pi As = 50db test designed MATLAB source code to write.

设计一个数字FIR低通滤波器，其技术指标如下： Wp=0.2pi Rp=0.25Db Ws=0.3pi As=50db 试写出MATLAB设计的源程序 -Design a digital FIR low-pass filter, the technical indicators are as follows: Wp = 0.2pi Rp = 0.25Db Ws = 0.3pi As = 50db Write down the design sourc

设计巴特沃斯数字低通滤波器，要求通带边界频fp=2.1kHZ，通带最大衰减Rp=0.5dB；阻带边界频率fs=8kHZ，阻带最小衰减Rs=30dB,采样频率为Fs=20kHZ。-Design butterworth digital low pass filter, frequency passband border fp = 2.1 kHZ