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【简答题】
已知一个切比雪夫低通数字滤波器的系统函数 和它的通带截止频率θ p =0.2π，现用频率变换方法将它变换成一个通带截止频率为ω p =0.6π的数字滤波器，求数字滤波器的系统函数H(z)。
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