matlab,信号与系统相关已知传递函数为H(z)=[(z^2-2*0.95*z*cos(pi*0.5)+0.95^2)(z^2-2*0.95*cos(pi*0.7)+0.95^2)(z^2-2*0.95*z*cos(pi*0.9)+0.95^2)]/z^6,通过matlab求幅值响应与相频响应,要求尽量少得用系统自带公式,
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