how to use arguments in freqz function of signal processing toolbox

2013 8 8
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I found freqz function in signal processing toolbox
This function is describing follow as [h,w]=freqz(b, a,n) [h,f]=freqz(b,a,n,fs) ..
I have a question for this function in arguments
I would like to know the meaning of "1" in freqz(h,1) function
Thanks

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kjetil87
kjetil87 2013-8-8

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It just means that the denominator in the filter equation is one, therefor typing freqz(h,1) is kinda misleading because h is often used as
h=b/a

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