b******y
发帖数: 107 | 1 Hi,
I want to find the close form expression of the following filter
H(z) = z(1-alpha)^2/(z^2-2*alpha*z+alpha^2)
where alpha is a real parameter alpha = 1=2^(-k)
How to express the cutoff frequency of the filter in terms of alpha?
Can suggestions?
Thank you | b********n
发帖数: 181 | 2 把z换成e(jw),然后求模等于-3dB处， 如果你的cut off frequency是指-3dB
oh, 你问closed form,我觉得无解吧。这是个数学问题了
【在 b******y 的大作中提到】
: Hi,
: I want to find the close form expression of the following filter
: H(z) = z(1-alpha)^2/(z^2-2*alpha*z+alpha^2)
: where alpha is a real parameter alpha = 1=2^(-k)
: How to express the cutoff frequency of the filter in terms of alpha?
: Can suggestions?
: Thank you
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