How to find FIR approximation of an IIR function?

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Sherman Lim 2021-12-15

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回答： Star Strider 2021-12-15

Hi all,

I have an IIR frequency response function which I need to convert to a FIR function. How do I convert such function? The function is as the following:

L,u,sigma squared, bw and theta zero are costants.

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Star Strider 2021-12-15

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If it is possible to calculalte (and ideally plot) the magnitude response as a function of frequency, use the firls funciton to simulate a FIR filter design that matches it with reasonable precision. The firpm function is also an option.