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  设计一个60阶的滤波器，要求设计的滤波器0~π/8的幅度为1，在π/8~2π/8的幅度为1/2，在2π/8~4π/8的幅度响应为1/4，在4π/8~6π/8的幅度响应为1/6，在6π/8~π的响应为1/8，并且画出理想滤波器和设计得到的理想滤波器的幅度频率和响应进行比较(Design of a 60-order filter designed filter 0 ~~ π/8 the amplitude is 1, the π/8 ~ 2π/8 the amplitude is 1/2, 2π/8 ~ 4π/8 amplitude response is 1/4, 4π/8 ~ 6π/8 the amplitude response of 1/6, 6π/8 ~ π response of 1/8, and draw the ideal filters and design of an ideal filter amplitude frequency and response to compare)