Is there a difference between fir1 and designfilt with bandpassfir?

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Peter Bäuerle 2019-12-13

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回答： Sai Sri Pathuri 2020-2-25

Dear all,

I want use a fir1 bandpass filter and found both methods, the option with fir1 and the one with designfilt combined with bandpassfir. Is there a marked difference between both options? Which one should I use?

I'm grateful for any clarification.

Thanks,

Peter

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Star Strider 2019-12-13

What is bandpassfir? I cannot find it in the online documentation.

I usually use kaiserord to design FIR filters.

Peter Bäuerle 2019-12-13

If you look at the documentation for designfilt you find 'bandpassfir' as an option:

bpFilt = designfilt('bandpassfir','FilterOrder',20, ...

'CutoffFrequency1',500,'CutoffFrequency2',560, ...

'SampleRate',1500);

Well, obviously there are different ways to construct a fir filter. I also got the kaiserord and Fir1, but I can do witht he designfilt function as well....?

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Answer 1

Sai Sri Pathuri 2020-2-25

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The fir1 function might be referred as a subset of designfilt function because designfilt has more options than fir1. The designfilt function can be used in the design of FIR and IIR filters with various design methods whereas fir1 is used in the design of FIR filters using least-squares (ls) approximation method.

You may refer following links for documentation:

fir1 - https://www.mathworks.com/help/signal/ref/fir1.html

designfilt - https://www.mathworks.com/help/signal/ref/designfilt.html