[Matlab]切比雪夫Ⅰ型滤波器设计的滤波参数是什么含义

Question

Wp = [8/fs*2, 90/fs*2];
Ws = [4/fs*2, 100/fs*2];
[N, Wn]=cheb1ord(Wp, Ws, 3, 60);
[b, a] = cheby1(N, 0.5, Wn);

Ⅰ、以上是带通8Hz到90Hz，是从Wp设置的吗？
如果Ⅰ是对的话，那么
Ⅱ、Ws的4和100分别代表什么意思？
Ⅲ、cheb1ord中的4个参数所指什么？

Answer 1

你好，请自行参考matlab说明文档，里面阐述非常清楚

Chebyshev Type I filter order - MATLAB cheb1ord This MATLAB function returns the lowest order n of the Chebyshev Type I filter that loses no more than Rp dB in the passband and has at least Rs dB of attenuation in the stopband. https://www.mathworks.com/help/signal/ref/cheb1ord.html

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